java web 网上零食商城后端代码

（1）、dao层：
//user
package com.skeyedu.mall.dao.user;

import java.util.List;

import com.skeyedu.mall.dao.IBaseDao;
import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.param.UserParam;

public interface UserDao extends IBaseDao {
User findByLoginName(String loginName) throws Exception;//根据ID查询用户信息
int save(User user) throws Exception; //新增用户信息
void update(User user) throws Exception; //更新用户信息
public void deleteById(String id) throws Exception;
public List queryUserList(UserParam params) throws Exception;
public Integer queryUserCount(UserParam params) throws Exception;
public User queryUserById(Integer id) throws Exception;
}
//
package com.skeyedu.mall.dao.user;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.skeyedu.mall.dao.BaseDaoImpl;
import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.param.UserParam;
import com.skeyedu.mall.utils.EmptyUtils;

public class UserDaoImpl extends BaseDaoImpl implements UserDao{

public UserDaoImpl(Connection connection) {
    super(connection);
    // TODO Auto-generated constructor stub
}

@Override
public User findByLoginName(String loginName) throws Exception {
    // TODO Auto-generated method stub
    User user = null;
    try {
        UserParam param = new UserParam();
        param.setLoginName(loginName);
        List<User> userList = queryUserList(param);
        if(EmptyUtils.isEmpty(userList)) {
            return null;
        }else {
            return userList.get(0);
        }
        
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    
    return user;
}

@Override
public int save(User user) throws Exception {
    // TODO Auto-generated method stub
    Integer id = 0;
    try {
        String sql = "INSERT INTO skeyedu_user(loginName,userName,password,sex,identityCode,email,mobile) value(?,?,?,?,?,?,?)";
        try {
            Object param[] = new Object[] {user.getLoginName(),user.getUserName(),user.getPassword(),user.getSex(),user.getIdentityCode(),user.getEmail(),user.getMobile()};
            id = this.executeInsert(sql, param);
            user.setId(id);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
    }
    return id;
}

@Override
public void update(User user) throws Exception {
    // TODO Auto-generated method stub
    try {
        Object[] params = new Object[] {user.getUserName(),user.getType(),user.getSex(),user.getIdentityCode(),user.getEmail(),user.getMobile(),user.getId()};
        String sql = "UPDATE skeyedu_user SET userName = ?,type = ?,sex = ?,identityCode = ?,email=?,mobile=? WHERE 1=1 ";
        this.executeUpdate(sql, params);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
    }
}

@Override
public void deleteById(String id) throws Exception {
    // TODO Auto-generated method stub
    try {
        String sql = "delete from skeyedu_user where id = ?";
        Object params[] = new Object[] {id};
        this.executeUpdate(sql.toString(), params);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
    }
}

@Override
public Object tableToClass(ResultSet rs) throws Exception {
    // TODO Auto-generated method stub
    User user = new User();
    user.setLoginName(rs.getString("loginName"));
    user.setUserName(rs.getString("userName"));
    user.setPassword(rs.getString("password"));
    user.setSex(rs.getInt("sex"));
    user.setIdentityCode(rs.getString("identityCode"));
    user.setEmail(rs.getString("email"));
    user.setMobile(rs.getString("mobile"));
    user.setType(rs.getInt("type"));
    user.setId(rs.getInt("id"));
    return user;
}

@Override
public List<User> queryUserList(UserParam params) throws Exception {
    // TODO Auto-generated method stub
    List<Object> paramsList = new ArrayList<Object>();
    List<User> userList = new ArrayList<User>();
    StringBuffer sql = new StringBuffer("SELECT id,loginName,password,userName,sex,identityCode,email,mobile,type FROM skeyedu_user WHERE 1=1 ");
    ResultSet resultSet = null;
    try {
        if(EmptyUtils.isNotEmpty(params.getLoginName())) {
            sql.append(" AND loginName = ? ");
            paramsList.add(params.getLoginName());
        }
        if(EmptyUtils.isNotEmpty(params.getSort())) {
            sql.append(" ORDER BY " + params.getSort() + " ");
        }
        if(params.getIsPage()) {
            sql.append(" LIMIT " + params.getStartIndex() + ","+params.getPageSize());
        }
        resultSet = this.executeQuery(sql.toString(),paramsList.toArray());
        while(resultSet.next()) {
            User user= (User) this.tableToClass(resultSet);
            userList.add(user);
        }
        
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
        this.closeResource(resultSet);
    }
    return userList;
}

@Override
public Integer queryUserCount(UserParam params) throws Exception {
    // TODO Auto-generated method stub
    List<Object> paramsList = new ArrayList<Object>();
    StringBuffer sql = new StringBuffer("SELECT COUNT(*) count FROM skeyedu_user WHERE 1=1 ");
    Integer count = 0;
    if(EmptyUtils.isNotEmpty(params.getLoginName())) {
        sql.append(" AND loginName = ? ");
        paramsList.add(params.getLoginName());
    }
    ResultSet resultSet = this.executeQuery(sql.toString(), paramsList.toArray());
    try {
        while(resultSet.next()) {
            count = resultSet.getInt("count");
        }
    }catch (SQLException e) {
        e.printStackTrace();
    }catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
        this.closeResource(resultSet);
    }
    
    return count;
}

@Override
public User queryUserById(Integer id) throws Exception {
    // TODO Auto-generated method stub
    List<Object> paramsList = new ArrayList<Object>();
    List<User> userList = new ArrayList<User>();
    StringBuffer sql = new StringBuffer("SELECT id,loginName,userName,password,sex,identityCode,email,mobile,type from skeyedu_user WHERE id = ? ");
    ResultSet resultSet = this.executeQuery(sql.toString(), new Object[] {id});
    User user = null;
    try {
        while(resultSet.next()) {
            user= (User) this.tableToClass(resultSet);
        }
    }catch (SQLException e) {
        e.printStackTrace();
    }catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        this.closeResource();
    }
    return user;
}

}
//
prodauct
//
package com.skeyedu.mall.dao.product;

import java.util.List;

import com.skeyedu.mall.dao.IBaseDao;
import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.param.ProductParam;

/**

商品查询Dao
deleteById(Integer id)
getById(Integer id)
getRowCount(params)
getRowList(params)
*/
public interface ProductDao extends IBaseDao {
void updateStock(Integer id, Integer quantity) throws Exception;
public void save(Product product) throws Exception;
public void update(Product product) throws Exception;
public void deleteById(Integer id) throws Exception;
public Product getProductById(Integer id)throws Exception;
public List queryProductList(ProductParam params)throws Exception;
public Integer queryProductCount(ProductParam params)throws Exception;
}

////
package com.skeyedu.mall.dao.product;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.skeyedu.mall.dao.BaseDaoImpl;
import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.param.ProductParam;
import com.skeyedu.mall.utils.EmptyUtils;

public class ProductDaoImpl extends BaseDaoImpl implements ProductDao {

public ProductDaoImpl(Connection connection) {
    super(connection);
}

/**
 * 字段 和 列名 的对应
 *
 * @param rs
 * @return
 * @throws Exception
 */
@Override
public Product tableToClass(ResultSet rs) throws Exception {
    Product product = new Product();
    product.setId(rs.getInt("id"));
    product.setName(rs.getString("name"));
    product.setDescription(rs.getString("description"));
    product.setPrice(rs.getFloat("price"));
    product.setStock(rs.getInt("stock"));
    product.setCategoryLevel1Id(rs.getInt("categoryLevel1Id"));
    product.setCategoryLevel2Id(rs.getInt("categoryLevel2Id"));
    product.setCategoryLevel3Id(rs.getInt("categoryLevel3Id"));
    product.setFileName(rs.getString("fileName"));
    product.setSalenumber(rs.getInt("salenumber"));
    return product;
}

public void updateStock(Integer id, Integer quantity) {
    try {
        Object[] params = new Object[] {quantity,id};
        String sql = "update skeyedu_product set stock=? where id=? ";
        this.executeUpdate(sql, params);
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }
}

@Override
public void save(Product product) {
    Integer id=0;
    String sql="insert into skeyedu_product(name,description,price,stock,categoryLevel1Id,categoryLevel2Id,categoryLevel3Id,fileName,isDelete,salenumber) values(?,?,?,?,?,?,?,?,?,?) ";
    try {
        Object param[]=new Object[]{product.getName(),product.getDescription(),product.getPrice(),product.getStock(),product.getCategoryLevel1Id(),product.getCategoryLevel2Id(),product.getCategoryLevel3Id(),product.getFileName(),0,product.getSalenumber()};
        id=this.executeInsert(sql,param);
        product.setId(id);
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }
}

@Override
public void update(Product product) {
    try {
        Object[] params = new Object[] {product.getStock(),product.getSalenumber(),product.getId()};
        String sql = "update skeyedu_product set stock=?,salenumber=? where id=? ";
        this.executeUpdate(sql, params);
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }
    System.out.println("更新成功！");
}

@Override
public void deleteById(Integer id) throws Exception {
    String sql = "delete from skeyedu_product where id = ? ";
    Object params[] = new Object[] { id };
    try{
        this.executeUpdate(sql.toString(), params);
    }catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }
}

@Override
public Product getProductById(Integer id) throws Exception {
    String sql = "select id,name,description,price,stock,categoryLevel1Id,categoryLevel2Id,categoryLevel3Id,fileName,isDelete,salenumber from skeyedu_product where id = ? ";
    ResultSet resultSet = null;
    Product product = null;
    try {
        Object params[] = new Object[] { id };
        resultSet = this.executeQuery(sql, params);
        while (resultSet.next()) {
            product = tableToClass(resultSet);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        this.closeResource(resultSet);
        this.closeResource();
        return product;
    }
}

@Override
public List<Product> queryProductList(ProductParam params) throws Exception {
    List<Object> paramsList=new ArrayList<Object>();   
    List<Product> productList=new ArrayList<Product>();
    StringBuffer sql=new StringBuffer("select id,name,description,price,stock,categoryLevel1Id,categoryLevel2Id,categoryLevel3Id,fileName,isDelete,salenumber from skeyedu_product  where 1=1 ");
    ResultSet resultSet = null;
    try {
        if(EmptyUtils.isNotEmpty(params.getName())){
            sql.append(" and name = ? ");
            paramsList.add(params.getName());
        }
        if(EmptyUtils.isNotEmpty(params.getKeyword())){
            sql.append(" and name like ? ");
            paramsList.add("%"+params.getKeyword()+"%");
        }
        
        if(EmptyUtils.isNotEmpty(params.getCategoryId())){
            sql.append(" and (categoryLevel1Id = ? or categoryLevel2Id=? or categoryLevel3Id=? )");
            paramsList.add(params.getCategoryId());
            paramsList.add(params.getCategoryId());
            paramsList.add(params.getCategoryId());
        }
        
        if(EmptyUtils.isNotEmpty(params.getSort())){
            sql.append(" order by " + params.getSort()+" ");
        }
        
        if(params.isPage()){
            sql.append(" limit  " + params.getStartIndex() + "," + params.getPageSize());
        }
        resultSet=this.executeQuery(sql.toString(),paramsList.toArray());
        while (resultSet.next()) {
            Product product = this.tableToClass(resultSet);
            productList.add(product);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource(resultSet);
        this.closeResource();
    }
            
    return productList;
}


@Override
public Integer queryProductCount(ProductParam params) throws Exception {
    List<Object> paramsList=new ArrayList<Object>();   
    Integer count=0;
    StringBuffer sql=new StringBuffer("select count(*) count from skeyedu_product where 1=1 ");
    if(EmptyUtils.isNotEmpty(params.getName())){
        sql.append(" and name = ? ");
        paramsList.add(params.getName());
    }
    if(EmptyUtils.isNotEmpty(params.getKeyword())){
        sql.append(" and name like ? ");
        paramsList.add("%"+params.getKeyword()+"%");
    }
    ResultSet resultSet = this.executeQuery(sql.toString(),paramsList.toArray());
    try {
        while (resultSet.next()) {
            count=resultSet.getInt("count");
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource(resultSet);
        this.closeResource();
    }
    return count;
}

}

///
package com.skeyedu.mall.dao.product;

import java.util.List;

import com.skeyedu.mall.dao.IBaseDao;
import com.skeyedu.mall.entity.ProductCategory;
import com.skeyedu.mall.param.ProductCategoryParam;

public interface ProductCategoryDao extends IBaseDao{
void deleteById(Integer parseLong);//删除商品分类
public List queryProductCategorylist(ProductCategoryParam param); //查询商品分类列表分页
public List queryAllProductCategorylist(ProductCategoryParam param); //查询商品分类列表分页
public ProductCategory queryProductCategoryById(Integer id);
public Integer save(ProductCategory productCategory) ;
public Integer queryProductCategoryCount(ProductCategoryParam param);
public void update(ProductCategory productCategory);
}
////
package com.skeyedu.mall.dao.product;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.skeyedu.mall.dao.BaseDaoImpl;
import com.skeyedu.mall.entity.ProductCategory;
import com.skeyedu.mall.param.ProductCategoryParam;
import com.skeyedu.mall.utils.EmptyUtils;

public class ProductCategoryDaoImpl extends BaseDaoImpl implements ProductCategoryDao{

public ProductCategoryDaoImpl(Connection connection) {
    super(connection);
    // TODO Auto-generated constructor stub
}


@Override
public ProductCategory tableToClass(ResultSet rs) throws Exception {
    ProductCategory productCategory = new ProductCategory();
    productCategory.setId(rs.getInt("id"));
    productCategory.setName(rs.getString("name"));
    productCategory.setParentId(rs.getInt("parentId"));
    productCategory.setType(rs.getInt("type"));
    productCategory.setIconClass(rs.getString("iconClass"));
    return productCategory;
}

public ProductCategory mapToClass(Map map) throws Exception {
    ProductCategory productCategory = new ProductCategory();
    Object idObject=map.get("id");
    Object nameObject=map.get("name");
    Object parentIdObject=map.get("parentId");
    Object typeObject=map.get("type");
    Object iconClassObject=map.get("iconClass");
    Object parentNameObject=map.get("parentName");
    productCategory.setId(EmptyUtils.isEmpty(idObject)?null:(Integer)idObject);
    productCategory.setName(EmptyUtils.isEmpty(nameObject)?null:(String)nameObject);
    productCategory.setParentId(EmptyUtils.isEmpty(parentIdObject)?null:(Integer)parentIdObject);
    productCategory.setType(EmptyUtils.isEmpty(typeObject)?null:(Integer)typeObject);
    productCategory.setIconClass(EmptyUtils.isEmpty(iconClassObject)?null:(String)iconClassObject);
    productCategory.setParentName(EmptyUtils.isEmpty(parentNameObject)?null:(String)parentNameObject);
    return productCategory;
}

public List<ProductCategory> queryAllProductCategorylist(ProductCategoryParam params){
    List<ProductCategory> list=new ArrayList<ProductCategory>();
    List<Object> paramsList=new ArrayList<Object>();
    StringBuffer sqlBuffer=new StringBuffer("SELECT epc1.*,epc2.name as parentName FROM skeyedu_product_category epc1 LEFT JOIN skeyedu_product_category epc2 ON epc1.parentId=epc2.id where 1=1 ");
    ResultSet resultSet=null;
    try{
        if(EmptyUtils.isNotEmpty(params.getName())){
            sqlBuffer.append(" and name like ? ");
            paramsList.add("%"+params.getName()+"%");
        }
        if(EmptyUtils.isNotEmpty(params.getParentId())){
            sqlBuffer.append(" and parentId = ? ");
            paramsList.add(params.getParentId());
        }
        if(EmptyUtils.isNotEmpty(params.getSort())){
            sqlBuffer.append(" order by " + params.getSort()+" ");
        }
        if(params.isPage()){
            sqlBuffer.append(" limit  " + params.getStartIndex() + "," + params.getPageSize());
        }
        resultSet=this.executeQuery(sqlBuffer.toString(),paramsList.toArray());
        ResultSetMetaData md=resultSet.getMetaData();
        Map<String,Object> rowData=new HashMap<String,Object>();
        int count=md.getColumnCount();
        for(int i=1;i<=count;i++){
            rowData.put(md.getColumnLabel(i),resultSet.getObject(i));
        }
        list.add(mapToClass(rowData));
    }catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
        this.closeResource(resultSet);
    }


    return list;
}

@Override
public void deleteById(Integer id){
    String sql = "delete from skeyedu_product_category where id = ? ";
    Object params[] = new Object[] { id };
    this.executeUpdate(sql.toString(), params); 
}

@Override
public List<ProductCategory> queryProductCategorylist(ProductCategoryParam params) {
    List<Object> paramsList=new ArrayList<Object>();   
    List<ProductCategory> productList=new ArrayList<ProductCategory>();
    StringBuffer sql=new StringBuffer("SELECT id,name,parentId,type,iconClass  FROM skeyedu_product_category where 1=1 ");
    ResultSet resultSet=null;
    try {
        if(EmptyUtils.isNotEmpty(params.getName())){
            sql.append(" and name like ? ");
            paramsList.add("%"+params.getName()+"%");
        }
        if(EmptyUtils.isNotEmpty(params.getParentId())){
            sql.append(" and parentId = ? ");
            paramsList.add(params.getParentId());
        }
        if(EmptyUtils.isNotEmpty(params.getType())){
            sql.append(" and type = ? ");
            paramsList.add(params.getType());
        }
        if(params.isPage()){
            sql.append(" limit  " + params.getStartIndex() + "," + params.getPageSize());
        }
        resultSet=this.executeQuery(sql.toString(), paramsList.toArray());
        while (resultSet.next()) {
            ProductCategory productCategory = this.tableToClass(resultSet);
            productList.add(productCategory);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
        this.closeResource(resultSet);
    }
    return productList;
}

public Integer queryProductCategoryCount(ProductCategoryParam params){
    List<Object> paramsList=new ArrayList<Object>();   
    Integer count=0;
    StringBuffer sql=new StringBuffer("SELECT count(*) count FROM skeyedu_product_category where 1=1 ");
    if(EmptyUtils.isNotEmpty(params.getName())){
        sql.append(" and name like ? ");
        paramsList.add("%"+params.getName()+"%");
    }
    if(EmptyUtils.isNotEmpty(params.getParentId())){
        sql.append(" and parentId = ? ");
        paramsList.add(params.getParentId());
    }
    ResultSet resultSet=this.executeQuery(sql.toString(), paramsList.toArray());
    try {
        while (resultSet.next()) {
            count=resultSet.getInt("count");
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
        this.closeResource(resultSet);
    }
    return count;
}

public ProductCategory queryProductCategoryById(Integer id){
    List<Object> paramsList=new ArrayList<Object>();   
    ProductCategory productCategory=null;
    StringBuffer sql=new StringBuffer("SELECT id,name,parentId,type,iconClass  FROM skeyedu_product_category where id = ? ");
    ResultSet resultSet=this.executeQuery(sql.toString(),new Object[]{id});
    try {
        while (resultSet.next()) {
            productCategory = this.tableToClass(resultSet);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
        this.closeResource(resultSet);
    }
    return productCategory;
}

public Integer save(ProductCategory productCategory)  {//新增用户信息
    Integer id=0;
    try {
        String sql="INSERT into skeyedu_product_category(name,parentId,type,iconClass) values(?,?,?,?) ";
        Object param[]=new Object[]{productCategory.getName(),productCategory.getParentId(),productCategory.getType(),productCategory.getIconClass()};
        id=this.executeInsert(sql,param);
        productCategory.setId(id);
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }
    return id;
}

@Override
public void update(ProductCategory productCategory) {
    try {
        Object[] params = new Object[] {productCategory.getName(),productCategory.getParentId(),productCategory.getType(),productCategory.getIconClass(),productCategory.getId()};
        String sql = "UPDATE skeyedu_product_category SET name=?,parentId=?,type=?,iconClass=? WHERE id =?  ";
        this.executeUpdate(sql, params);
    } catch (Exception e) {
        e.printStackTrace();
    }finally{
        this.closeResource();
    }       
}

}
/////
package com.skeyedu.mall.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import org.apache.log4j.Logger;

public abstract class BaseDaoImpl {
protected Connection connection;

protected PreparedStatement pstm;

static Logger logger=Logger.getLogger(BaseDaoImpl.class);
        
public BaseDaoImpl(Connection connection) {
    this.connection = connection;
}
//这里面传入的sql  都是带有？？？
public ResultSet executeQuery(String sql,Object[] params){
    ResultSet rs=null;
    try {
        pstm = connection.prepareStatement(sql);
        for(int i = 0; i < params.length; i++){
            pstm.setObject(i+1, params[i]);
        }
        rs = pstm.executeQuery();
    } catch (Exception e) {
        e.printStackTrace();
    }
    
    return rs;
}

//增删改操作 delete from news_detail where id=? and title=?
public int executeUpdate(String sql,Object[] params){
    int updateRows = 0;
    try {
        pstm = connection.prepareStatement(sql);
        for(int i = 0; i < params.length; i++){
            pstm.setObject(i+1, params[i]);
        }
        updateRows = pstm.executeUpdate();
    } catch (Exception e) {
        e.printStackTrace();
        updateRows = -1;
    }
    
    return updateRows;
}

public int executeInsert(String sql,Object[] params){
    Long id = 0L;
    try {
        pstm = connection.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);
        for(int i = 0; i < params.length; i++){
            pstm.setObject(i+1, params[i]);
        }
        pstm.executeUpdate();
        ResultSet rs = pstm.getGeneratedKeys(); 
        if (rs.next()) { 
            id = rs.getLong(1);
        } 
        
    } catch (Exception e) {
        e.printStackTrace();
        id =null;
    }   
    return id.intValue();
}


//释放资源
public boolean closeResource(){
    if(pstm != null){
        try {
            pstm.close();
        } catch (SQLException e) {
            e.printStackTrace();
            return false;
        }
    }
    return true;
}

public boolean closeResource(ResultSet reSet){
    if(reSet != null){
        try {
            reSet.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return false;
        }
    }
    return true;
}

/**
 * 需要重写的方法
 *
 * @param rs
 * @return
 * @throws Exception
 */
public abstract Object tableToClass(ResultSet rs) throws Exception;

}

//////
（2）、entity层：
//product
package com.skeyedu.mall.entity;

import java.io.Serializable;

public class Product implements Serializable{
private Integer id;//ID
private String name;//商品名
private String description;//描述
private Float price;//单价
private Integer stock;//数量
private Integer categoryLevel1Id;//一级分类
private Integer categoryLevel2Id;//二级分类
private Integer categoryLevel3Id;//三级分类
private String fileName;//图片名称
private int salenumber;

public int getSalenumber() {
    return salenumber;
}

public void setSalenumber(int salenumber) {
    this.salenumber = salenumber;
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public Float getPrice() {
    return price;
}

public void setPrice(Float price) {
    this.price = price;
}



public Integer getStock() {
    return stock;
}

public void setStock(Integer stock) {
    this.stock = stock;
}

public Integer getCategoryLevel1Id() {
    return categoryLevel1Id;
}

public void setCategoryLevel1Id(Integer categoryLevel1Id) {
    this.categoryLevel1Id = categoryLevel1Id;
}

public Integer getCategoryLevel2Id() {
    return categoryLevel2Id;
}

public void setCategoryLevel2Id(Integer categoryLevel2Id) {
    this.categoryLevel2Id = categoryLevel2Id;
}

public Integer getCategoryLevel3Id() {
    return categoryLevel3Id;
}

public void setCategoryLevel3Id(Integer categoryLevel3Id) {
    this.categoryLevel3Id = categoryLevel3Id;
}

public String getFileName() {
    return fileName;
}

public void setFileName(String fileName) {
    this.fileName = fileName;
}

}
///
package com.skeyedu.mall.entity;
import java.io.Serializable;
public class ProductCategory implements Serializable{

private Integer id;//ID
private String name;//名称
private Integer parentId;//父级ID
private Integer type;//级别(1:一级 2：二级 3：三级)
private String iconClass;//图标
private String parentName; //父级名称

public String getIconClass() {
    return iconClass;
}

public void setIconClass(String iconClass) {
    this.iconClass = iconClass;
}

public Integer getType() {
    return type;
}

public void setType(Integer type) {
    this.type = type;
}


public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}

public Integer getParentId() {
    return parentId;
}

public void setParentId(Integer parentId) {
    this.parentId = parentId;
}

public String getParentName() {
    return parentName;
}

public void setParentName(String parentName) {
    this.parentName = parentName;
}

}
////
package com.skeyedu.mall.entity;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable{

private Integer id;
private String loginName;//ID
private String userName;//用户名
private String password;//密码
private Integer sex;//性别
private String identityCode;
private String email;//电子邮箱
private String mobile;//电话
private Integer type;//类型（1：后台 0:前台）
public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
public String getLoginName() {
    return loginName;
}
public void setLoginName(String loginName) {
    this.loginName = loginName;
}
public String getUserName() {
    return userName;
}
public void setUserName(String userName) {
    this.userName = userName;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public Integer getSex() {
    return sex;
}
public void setSex(Integer sex) {
    this.sex = sex;
}
public String getIdentityCode() {
    return identityCode;
}
public void setIdentityCode(String identityCode) {
    this.identityCode = identityCode;
}
public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public String getMobile() {
    return mobile;
}
public void setMobile(String mobile) {
    this.mobile = mobile;
}
public Integer getType() {
    return type;
}
public void setType(Integer type) {
    this.type = type;
}

}
////
package com.skeyedu.mall.entity;

import java.io.Serializable;
import java.util.Date;
import java.util.List;

public class Order implements Serializable {

private Integer id;//ID
private String serialNumber;//订单号
private Integer userId;//登录id
private String userAddress;//收货地址
private Date createTime;//创建时间
private Float cost;//订单总计价格

private String loginName;//登录名
private List<OrderDetail> orderDetailList;  //订单详情 OrderDetail泛型List集合

public List<OrderDetail> getOrderDetailList() {
    return orderDetailList;
}

public void setOrderDetailList(List<OrderDetail> orderDetailList) {
    this.orderDetailList = orderDetailList;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}


public String getLoginName() {
    return loginName;
}

public void setLoginName(String loginName) {
    this.loginName = loginName;
}

public Date getCreateTime() {
    return createTime;
}

public void setCreateTime(Date createTime) {
    this.createTime = createTime;
}

public Float getCost() {
    return cost;
}

public void setCost(Float cost) {
    this.cost = cost;
}

public Integer getUserId() {
    return userId;
}

public void setUserId(Integer userId) {
    this.userId = userId;
}

public void setId(Integer id) {
    this.id = id;
}

public String getUserAddress() {
    return userAddress;
}

public void setUserAddress(String userAddress) {
    this.userAddress = userAddress;
}

public String getSerialNumber() {
    return serialNumber;
}

public void setSerialNumber(String serialNumber) {
    this.serialNumber = serialNumber;
}

}
////
package com.skeyedu.mall.entity;

import java.io.Serializable;

public class OrderDetail implements Serializable{
private Integer id;//ID
private Integer orderId;//订单ID
private Integer quantity;//数量
private Float cost;//单价
private Integer productId;

private Product product;//商品
public Integer getProductId() {
    return productId;
}

public void setProductId(Integer productId) {
    this.productId = productId;
}

public Integer getId() {
    return id;
}

public void setId(Integer id) {
    this.id = id;
}


public Integer getOrderId() {
    return orderId;
}

public void setOrderId(Integer orderId) {
    this.orderId = orderId;
}

public Product getProduct() {
    return product;
}

public void setProduct(Product product) {
    this.product = product;
}


public Integer getQuantity() {
    return quantity;
}

public void setQuantity(Integer quantity) {
    this.quantity = quantity;
}

public Float getCost() {
    return cost;
}

public void setCost(Float cost) {
    this.cost = cost;
}

}
////
package com.skeyedu.mall.entity;
import java.io.Serializable;
import java.util.Date;

/**

@ClassName UserAddress
@Description TODO(用户地址实体类)
@author Mr.Yan
@Email [email protected]
@Date 2019年5月8日下午6:14:30
@version 1.0.0
*/
public class UserAddress implements Serializable {

private Integer id;

private String address; //地址

private Integer userId; //用户ID

private Date createTime;//创建时间

private String remark; //备注

private Integer isDefault; //是否是默认地址（1:是 0否）

public Integer getIsDefault() {
return isDefault;
}

public void setIsDefault(Integer isDefault) {
this.isDefault = isDefault;
}

public String getRemark() {
return remark;
}

public void setRemark(String remark) {
this.remark = remark;
}

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public Date getCreateTime() {
return createTime;
}

public void setCreateTime(Date createTime) {
this.createTime = createTime;
}

public Integer getUserId() {
return userId;
}

public void setUserId(Integer userId) {
this.userId = userId;
}

}
///
（3）service层
///
package com.skeyedu.mall.service.order;

import com.skeyedu.mall.utils.ShoppingCart;

/**

Created by bdqn on 2016/5/11.
*/
public interface CartService {

public ShoppingCart modifyShoppingCart(String productId,String quantityStr,ShoppingCart cart) throws Exception;

public ShoppingCart calculate(ShoppingCart cart)throws Exception;
}

////
package com.skeyedu.mall.service.order;

import java.sql.Connection;

import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.ShoppingCart;
import com.skeyedu.mall.utils.ShoppingCartItem;

/**

Created by bdqn on 2016/5/11.
*/
public class CartServiceImpl implements CartService {
@Override
public ShoppingCart modifyShoppingCart(String productId, String quantityStr, ShoppingCart cart) throws Exception {
Integer quantity = 0;
if (!EmptyUtils.isEmpty(quantityStr))
quantity = Integer.parseInt(quantityStr);
//便利购物车寻找该商品修改其数量
for (ShoppingCartItem item : cart.getItems()) {
if (item.getProduct().getId().toString().equals(productId)) {
if (quantity == 0 || quantity < 0) {
cart.getItems().remove(item);
break;
} else {
item.setQuantity(quantity);
}
}
}
//重新计算金额
calculate(cart);
return cart;
}
/**
- 核算购物车的金额
- @param cart
- @return
- @throws Exception
  /
  @Override
  public ShoppingCart calculate(ShoppingCart cart) throws Exception {
  double sum = 0.0;
  for (ShoppingCartItem item : cart.getItems()) {
  sum = sum + item.getQuantity() item.getProduct().getPrice();
  item.setCost(item.getQuantity() * item.getProduct().getPrice());
  }
  cart.setSum(sum);
  return cart;
  }
  }
  /////
  package com.skeyedu.mall.service.product;

import java.util.List;

import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.param.ProductParam;
import com.skeyedu.mall.utils.Pager;

public interface ProductService {
/**
* 根据分类查询商品列表
* @param categoryId
* @param level
* @param pager
* @return
*/
public List getProductsByCategory(Integer categoryId, int level, Pager pager,String keyWord);
/**
* 根据分类查询商品数目
* @param categoryId
* @param level
* @return
*/
int getProductRowCount(String categoryId,int level,String keyWord);
/**
* 根据id查询商品
* @param id
* @return
*/
Product findById(String id);//根据ID查询商品
/**
* 保存商品返回id
* @param product
* @return
*/
Integer saveOrUpdate(Product product);//保存一款商品
/**
* 查询商品数目
* @param params
* @return
*/
public int getProductRowCount(ProductParam params);
/**
* 查询商品列表
* @param params
* @return
*/
List queryProductsList(ProductParam params);
/**
* 根据id删除商品
* @param id
*/
public void deleteById(Integer id);
/**
* 根据分类id查询数目
* @param categoryId
* @return
*/
public int getProductCountBycategory(Integer categoryId);

}
///
package com.skeyedu.mall.service.product;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import com.skeyedu.mall.dao.product.ProductCategoryDao;
import com.skeyedu.mall.dao.product.ProductCategoryDaoImpl;
import com.skeyedu.mall.entity.ProductCategory;
import com.skeyedu.mall.param.ProductCategoryParam;
import com.skeyedu.mall.utils.DataSourceUtil;
import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.ProductCategoryVo;

public class ProductCategoryServiceImpl implements ProductCategoryService{
/**

@param id
* @return
*/
@Override
public ProductCategory getById(Integer id) {
Connection connection = null;
ProductCategory productCategory = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
productCategory =productCategoryDao.queryProductCategoryById(id);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
return productCategory;
}

@Override
public List queryProductCategoryList(ProductCategoryParam params) {
Connection connection = null;
List rtn = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
rtn = productCategoryDao.queryProductCategorylist(params);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
return rtn;
}

public List queryProductCategorylistBySql(ProductCategoryParam params) {
Connection connection = null;
List rtn = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
rtn = productCategoryDao.queryProductCategorylist(params);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
return rtn;
}

@Override
public int queryProductCategoryCount(ProductCategoryParam params) {
Connection connection = null;
int rtn = 0;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
rtn = productCategoryDao.queryProductCategoryCount(params);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
return rtn;
}

@Override
public void modifyProductCategory(ProductCategory productCategory) {
Connection connection = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
productCategoryDao.update(productCategory);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
}
/**
* 新增商品分类
* @param params
*/
@Override
public void addProductCategory(ProductCategory productCategory) {
Connection connection = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
productCategoryDao.save(productCategory);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
}
/**
* 根据Id删除商品
* @param id
*/
@Override
public void deleteById(Integer id) {
Connection connection = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
productCategoryDao.deleteById(id);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
}
}
/**
* 查询全部的商品分类
* @return
*/
@Override
public List queryAllProductCategoryList() {
//查询一级分类的列表
List productCategory1VoList = new ArrayList ();
//查询一级分类
List productCategory1List = getProductCategories(null); //根据父ID查询所有子商品分类
//查询二级分类
for (ProductCategory product1Category : productCategory1List) {
//封装一级分类
ProductCategoryVo productCategoryVo = new ProductCategoryVo();
productCategoryVo.setProductCategory(product1Category);
List productCategoryVo1ChildList = new ArrayList ();
//根据一级分类查询二级分类
List productCategory2List = getProductCategories(product1Category.getId());
for (ProductCategory productCategory2 : productCategory2List) {
ProductCategoryVo productCategoryVo2 = new ProductCategoryVo();
productCategoryVo1ChildList.add(productCategoryVo2);
productCategoryVo2.setProductCategory(productCategory2);
List productCategoryVo2ChildList = new ArrayList ();
productCategoryVo2.setProductCategoryVoList(productCategoryVo2ChildList);
//根据二级分类查询三级分类的列表
List productCategory3List = getProductCategories(productCategory2.getId());
for (ProductCategory productCategory3 : productCategory3List) {
ProductCategoryVo productCategoryVo3 = new ProductCategoryVo();
productCategoryVo3.setProductCategory(productCategory3);
productCategoryVo2ChildList.add(productCategoryVo3);
}
}
productCategoryVo.setProductCategoryVoList(productCategoryVo1ChildList);
productCategory1VoList.add(productCategoryVo);
}
return productCategory1VoList;
}
/**
* 查询子分类
* @param parentId
* @return
*/
private List getProductCategories(Integer parentId) {//根据父ID查询所有子商品分类
Connection connection = null;
List productCategoryList = null;
try {
connection = DataSourceUtil.openConnection();
ProductCategoryDao productCategoryDao = new ProductCategoryDaoImpl(connection);
ProductCategoryParam params = new ProductCategoryParam();
if (EmptyUtils.isNotEmpty(parentId)) {
params.setParentId(parentId);
} else {
params.setParentId(0);
}
productCategoryList = productCategoryDao.queryProductCategorylist(params);
} catch (Exception e) {
e.printStackTrace();
} finally {
DataSourceUtil.closeConnection(connection);
return productCategoryList;
}
}

}
///
package com.skeyedu.mall.service.user;

import java.util.List;

import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.param.UserParam;

public interface UserService {
public void update(User user);//更新用户信息
public User findByLoginName(String loginName); //根据ID查询用户信息
public boolean save(User user); //新增用户
void delete(String id);//根据用户名删除用户
public List queryUserList(UserParam userParam);
public int queryUserCount(UserParam params);
public User queryUserById(Integer userId);
}
////
package com.skeyedu.mall.service.user;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;

import com.skeyedu.mall.dao.user.UserDao;
import com.skeyedu.mall.dao.user.UserDaoImpl;
import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.param.UserParam;
import com.skeyedu.mall.utils.DataSourceUtil;

public class UserServiceImpl implements UserService{

@Override 
public void update(User user) {   //更新用户信息
    // TODO Auto-generated method stub
    Connection connection = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            userDao.update(user);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
}

@Override
public User findByLoginName(String loginName) {
    // TODO Auto-generated method stub
    Connection connection = null;
    User user = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            user = userDao.findByLoginName(loginName);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
    return user;
}

@Override
public boolean save(User user) {  //新增用户信息
    // TODO Auto-generated method stub
    boolean flag = false;
    Connection connection = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        int count = userDao.save(user);
        flag = count>0;
    } catch (SQLException e) {
        flag = false;
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
        return flag;
    }
}

@Override
public void delete(String id) {
    // TODO Auto-generated method stub
    Connection connection = null;
    List<User> userList = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            userDao.deleteById(id);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
}

@Override
public List<User> queryUserList(UserParam userParam) {
    // TODO Auto-generated method stub
    Connection connection = null;
    List<User> userList = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            userList = userDao.queryUserList(userParam);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
    return userList;
}

@Override
public int queryUserCount(UserParam params) {
    // TODO Auto-generated method stub
    Connection connection = null;
    int count = 0;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            count = userDao.queryUserCount(params);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
    
    return count;
}

@Override
public User queryUserById(Integer userId) {
    // TODO Auto-generated method stub
    Connection connection = null;
    User user = null;
    try {
        connection = DataSourceUtil.openConnection();
        UserDao userDao = new UserDaoImpl(connection);
        try {
            user = (User)userDao.queryUserById(userId);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        DataSourceUtil.closeConnection(connection);
    }
    return user;
}

}
////
（3）、Utils层：
////
package com.skeyedu.mall.utils;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.util.Properties;

/**

@ClassName DataSourceUtil
@Description TODO(获取JDBC的Connection接口并连接、关闭连接的封装类)
@author Mr.Yan
@Email [email protected]
@Date 2019年5月8日下午4:01:34
@version 1.0.0
*/
public class DataSourceUtil {

private static String driver;
private static String url;
private static String user;
private static String password;

static {
init();
}

public static void init(){
Properties params=new Properties();
String configFile = "database.properties";
InputStream is=DataSourceUtil.class.getClassLoader().getResourceAsStream(configFile);
try {
params.load(is);
} catch (IOException e) {
e.printStackTrace();
}
driver=params.getProperty("driver");
url=params.getProperty("url");
user=params.getProperty("username");
password=params.getProperty("password");
}

//获取连接
public static Connection openConnection() throws SQLException {
Connection connection = null;
try {
Class.forName(driver);
connection = DriverManager.getConnection(url, user, password);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
```
 return connection;
```
}
//关闭连接
public static void closeConnection(Connection connection) {
try {
if (connection != null)
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}

}
/////
package com.skeyedu.mall.utils;
import java.util.Collection;
import java.util.Map;

/**

@ClassName EmptyUtils
@Description TODO(判断是否是空的工具类)
@author Mr.Yan
@Email [email protected]
@Date 2019年5月8日下午2:25:28
@version 1.0.0
*/
public class EmptyUtils {
//判空
public static boolean isEmpty(Object obj){
if (obj == null)
return true;
if (obj instanceof CharSequence)
return ((CharSequence) obj).length() == 0;
if (obj instanceof Collection)
return ((Collection) obj).isEmpty();
if (obj instanceof Map)
return ((Map) obj).isEmpty();
if (obj instanceof Object[]) {
Object[] object = (Object[]) obj;
if (object.length == 0) {
return true;
}
boolean empty = true;
for (int i = 0; i < object.length; i++) {
if (!isEmpty(object[i])) {
empty = false;
break;
}
}
return empty;
}
return false;
}
/**
- author: Mr.Yan
- Qq: 7631990
- @Description (判断不为空)
- @param obj
- @return
  */
  public static boolean isNotEmpty(Object obj){
  return !isEmpty(obj);
  }
/**
- author: Mr.Yan
- Qq: 7631990
- @Description (效验一个对象数组中的每个对象是否为空，如果有空返回true，没有返回false)
- @param args
- @return
  */
  private boolean validPropertyEmpty(Object ...args) {
  for (int i = 0; i < args.length; i++) {
  if(EmptyUtils.isEmpty(args[i])){
  return true;
  }
  }
  return false;
  }
  }
  ////
  package com.skeyedu.mall.utils;

import java.io.Serializable;
import java.util.List;

import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.entity.ProductCategory;

public class ProductCategoryVo implements Serializable {

private ProductCategory productCategory;
private List<ProductCategoryVo> productCategoryVoList;
private List<Product> productList;

public ProductCategory getProductCategory() {
    return productCategory;
}

public void setProductCategory(ProductCategory productCategory) {
    this.productCategory = productCategory;
}

public List<ProductCategoryVo> getProductCategoryVoList() {
    return productCategoryVoList;
}

public void setProductCategoryVoList(List<ProductCategoryVo> productCategoryVoList) {
    this.productCategoryVoList = productCategoryVoList;
}

public List<Product> getProductList() {
    return productList;
}

public void setProductList(List<Product> productList) {
    this.productList = productList;
}

}

///
package com.skeyedu.mall.utils;

import java.io.Serializable;
import java.util.List;

import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.entity.ProductCategory;

public class ProductCategoryVo implements Serializable {

private ProductCategory productCategory;
private List<ProductCategoryVo> productCategoryVoList;
private List<Product> productList;

public ProductCategory getProductCategory() {
    return productCategory;
}

public void setProductCategory(ProductCategory productCategory) {
    this.productCategory = productCategory;
}

public List<ProductCategoryVo> getProductCategoryVoList() {
    return productCategoryVoList;
}

public void setProductCategoryVoList(List<ProductCategoryVo> productCategoryVoList) {
    this.productCategoryVoList = productCategoryVoList;
}

public List<Product> getProductList() {
    return productList;
}

public void setProductList(List<Product> productList) {
    this.productList = productList;
}

}

////
package com.skeyedu.mall.utils;

import java.io.Serializable;

/**

@ClassName ReturnResult
@Description TODO(定义ajax返回结果类)
@author Mr.Yan
@Email [email protected]
@Date 2019年5月8日下午2:00:15
@version 1.0.0
*/
public class ReturnResult implements Serializable{

private int status;
private Object data;
private String message="操作成功";

public int getStatus() {
return status;
}

public void setStatus(int status) {
this.status = status;
}

public Object getData() {
return data;
}

public void setData(Object data) {
this.data = data;
}

public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
/**
- 返回成功状态
- @param obj
  */
  public ReturnResult returnSuccess(Object obj){
  this.status=Constants.ReturnResult.SUCCESS;
  this.data=obj;
  return this;
  }
  /**
- 返回默认成功状态
  */
  public ReturnResult returnSuccess(){
  this.status=Constants.ReturnResult.SUCCESS;
  return this;
  }
  /**
- 返回失败状态
- @param message
- 成功：status=1,
- 失败：status=0;
  */
  public ReturnResult returnFail(String message){
  this.status=Constants.ReturnResult.FAIL;
  this.message=message;
  return this;
  }
public ReturnResult(String message, int status, Object data) {
this.message = message;
this.status = status;
this.data = data;
}

public ReturnResult(Object data) {
this.status=Constants.ReturnResult.SUCCESS;
this.data = data;
}

public ReturnResult(){

}
}
/////
package com.skeyedu.mall.utils;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import com.skeyedu.mall.entity.Product;

public class ShoppingCart implements Serializable{
public List items = new ArrayList ();
private Double sum;

//获取购物车中所有商品
public List<ShoppingCartItem> getItems() {
    return items;
}   
//添加一项
public ReturnResult addItem(Product product, Integer quantity) {
    ReturnResult result=new ReturnResult();
    int flag=0;
    for(int i=0;i<items.size();i++){
        //判断购物车中是否已有此商品，如果有则累计数量
        if((items.get(i).getProduct().getId()).equals(product.getId())){
            if(items.get(i).getQuantity()+quantity>product.getStock()){
                return result.returnFail("商品数量不足");
            }else{
                items.get(i).setQuantity(items.get(i).getQuantity()+quantity);
                flag=1;
            }
        }
    }
    if(quantity>product.getStock()){
        return result.returnFail("商品数量不足");
    }
    if(flag==0){
        items.add(new ShoppingCartItem(product, quantity));
    }
    return result.returnSuccess();
}

//移除一项
public void removeItem(int index) {
    items.remove(index);
}

//修改数量
public void modifyQuantity(int index, Integer quantity) {
    items.get(index).setQuantity(quantity);
}

//计算总价格
public float getTotalCost() {
    float sum = 0;
    for (ShoppingCartItem item : items) {
        sum = sum + item.getCost();
    }
    return sum;
}

public void setItems(List<ShoppingCartItem> items) {
    this.items = items;
}

public Double getSum() {
    return sum;
}

public void setSum(Double sum) {
    this.sum = sum;
}

}
/////
package com.skeyedu.mall.utils;

import java.io.Serializable;

import com.skeyedu.mall.entity.Product;

public class ShoppingCartItem implements Serializable {
private Product product;// 商品
private Integer quantity;// 数量
private float cost;// 总价格

public ShoppingCartItem(Product product, Integer quantity) {
    this.product = product;
    this.quantity = quantity;
    this.cost = product.getPrice() * quantity;
}

public Integer getQuantity() {
    return quantity;
}

public void setQuantity(Integer quantity) {
    this.quantity = quantity;
    this.cost = product.getPrice() * quantity;
}

public Product getProduct() {
    return product;
}

public float getCost() {
    return cost;
}

public void setProduct(Product product) {
    this.product = product;
}

public void setCost(float cost) {
    this.cost = cost;
}

}
////
package com.skeyedu.mall.utils;

import org.apache.commons.codec.digest.DigestUtils;

public class SecurityUtils {
public static String md5Hex(String value) {
return DigestUtils.md5Hex(value);
}

    /**
     * 3次md5操作
     * @param value
     * @return
     */
    public static String md5Hex3(String value) {
        for (int i = 0; i < 3; i++) {
            value = DigestUtils.md5Hex(value);
        }
        return value;
    }
    
    
    /**
     * sha256加密
     *
     * @param value 要加密的值
     * @return sha256加密后的值
     */
    public static String sha256Hex(String value) {
        return DigestUtils.sha256Hex(value);
    }

    public static String sha512Hex(String value) {
        return DigestUtils.sha512Hex(value);
    }
    
    public static void main(String[] args) {
        System.out.println(SecurityUtils.md5Hex("zhangsan"));
    }

}
////
(4)、param层
package com.skeyedu.mall.param;

import com.skeyedu.mall.entity.User;

public class UserParam extends User {
private Integer startIndex;
private Integer pageSize;
private Boolean isPage = false;
private String sort;
public Integer getStartIndex() {
return startIndex;
}
public void setStartIndex(Integer startIndex) {
this.startIndex = startIndex;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public Boolean getIsPage() {
return isPage;
}
public void setIsPage(Boolean isPage) {
this.isPage = isPage;
}
public String getSort() {
return sort;
}
public void setSort(String sort) {
this.sort = sort;
}

public void openPage(Integer startIndex,Integer pageSize) {
    this.isPage = true;
    this.startIndex = startIndex;
    this.pageSize = pageSize;
}

}

/////
package com.skeyedu.mall.param;

import com.skeyedu.mall.entity.Product;

public class ProductParam extends Product{

private Integer startIndex;

private Integer pageSize;

private boolean isPage=false;

private String sort;

private String keyword;

private Integer categoryId;

public Integer getCategoryId() {
    return categoryId;
}

public void setCategoryId(Integer categoryId) {
    this.categoryId = categoryId;
}

public String getKeyword() {
    return keyword;
}

public void setKeyword(String keyword) {
    this.keyword = keyword;
}

public Integer getStartIndex() {
    return startIndex;
}

public void setStartIndex(Integer startIndex) {
    this.startIndex = startIndex;
}

public Integer getPageSize() {
    return pageSize;
}

public void setPageSize(Integer pageSize) {
    this.pageSize = pageSize;
}

public boolean isPage() {
    return isPage;
}

public void setPage(boolean isPage) {
    this.isPage = isPage;
}

public void openPage(Integer startIndex, Integer pageSize) {
    this.isPage = true;
    this.startIndex = startIndex;
    this.pageSize = pageSize;
}

public String getSort() {
    return sort;
}

public void setSort(String sort) {
    this.sort = sort;
}

}
////
package com.skeyedu.mall.param;

import com.skeyedu.mall.entity.ProductCategory;

public class ProductCategoryParam extends ProductCategory{
private Integer startIndex; //SQL LIMIT 起始位置用于分页
private Integer pageSize; //SQL LIMIT 结束位置用于分页
private boolean isPage=false; //默认不开启分页
private String sort; //排序

public Integer getStartIndex() {
    return startIndex;
}

public void setStartIndex(Integer startIndex) {
    this.startIndex = startIndex;
}

public Integer getPageSize() {
    return pageSize;
}

public void setPageSize(Integer pageSize) {
    this.pageSize = pageSize;
}

public boolean isPage() {
    return isPage;
}

public void setPage(boolean isPage) {
    this.isPage = isPage;
}

public void openPage(Integer startIndex, Integer pageSize) {
    this.isPage = true;
    this.startIndex = startIndex;
    this.pageSize = pageSize;
}

public String getSort() {
    return sort;
}

public void setSort(String sort) {
    this.sort = sort;
}

}
（5）、web， servlet层
/////
package com.skeyedu.mall.web.pre;

import java.sql.Connection;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.skeyedu.mall.dao.product.ProductDao;
import com.skeyedu.mall.dao.product.ProductDaoImpl;
import com.skeyedu.mall.entity.Order;
import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.entity.UserAddress;
import com.skeyedu.mall.service.order.CartService;
import com.skeyedu.mall.service.order.CartServiceImpl;
import com.skeyedu.mall.service.order.OrderService;
import com.skeyedu.mall.service.order.OrderServiceImpl;
import com.skeyedu.mall.service.product.ProductCategoryService;
import com.skeyedu.mall.service.product.ProductCategoryServiceImpl;
import com.skeyedu.mall.service.product.ProductService;
import com.skeyedu.mall.service.product.ProductServiceImpl;
import com.skeyedu.mall.service.user.UserAddressService;
import com.skeyedu.mall.service.user.UserAddressServiceImpl;
import com.skeyedu.mall.service.user.UserService;
import com.skeyedu.mall.service.user.UserServiceImpl;
import com.skeyedu.mall.utils.Constants;
import com.skeyedu.mall.utils.DataSourceUtil;
import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.ProductCategoryVo;
import com.skeyedu.mall.utils.ReturnResult;
import com.skeyedu.mall.utils.ShoppingCart;
import com.skeyedu.mall.utils.ShoppingCartItem;
import com.skeyedu.mall.web.AbstractServlet;

/**

Created by bdqn 2016/5/3.
*/
@WebServlet(urlPatterns = { "/Cart" }, name = "Cart")
public class CartServlet extends AbstractServlet {

private ProductService productService;

private OrderService orderService;

private UserService userService;

private ProductCategoryService productCategoryService;

private CartService cartService;

private UserAddressService userAddressService;

public void init() throws ServletException {
productService = new ProductServiceImpl();
orderService = new OrderServiceImpl();
userService = new UserServiceImpl();
productCategoryService = new ProductCategoryServiceImpl();
cartService = new CartServiceImpl();
userAddressService = new UserAddressServiceImpl();
}

@Override
public Class getServletClass() {
return CartServlet.class;
}
/**
- 添加到购物车
- @return
  /
  public ReturnResult add(HttpServletRequest request, HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  ReturnResult result = new ReturnResult();
  String id = request.getParameter("entityId");
  String quantityStr = request.getParameter("quantity");
  Integer quantity = 1;
  if(session.getAttribute("loginUser")==null){
  return result.returnFail("请先登录！");
  }
  else {if (!EmptyUtils.isEmpty(quantityStr))
  quantity = Integer.parseInt(quantityStr);
  //查询出商品
  Product product = productService.findById(id);
  if(product.getStock()<quantity){
  return result.returnFail("商品数量不足");
  }
  //获取购物车
  ShoppingCart cart = getCartFromSession(request);
  //往购物车放置商品
  result=cart.addItem(product, quantity);
  if(result.getStatus()==Constants.ReturnResult.SUCCESS){
  cart.setSum((EmptyUtils.isEmpty(cart.getSum()) ? 0.0 : cart.getSum()) + (product.getPrice() quantity * 1.0));
  }
  return result;
  }
  }
/**
- 刷新购物车
- @param request
- @param response
- @return
  */
  public String refreshCart(HttpServletRequest request, HttpServletResponse response) throws Exception {
  HttpSession session = request.getSession();
  ShoppingCart cart = getCartFromSession(request);
  cart = cartService.calculate(cart);
  session.setAttribute("cart", cart);//全部的商品
  return "/common/pre/searchBar";
  }
/**
- 跳到结算页面
- @param request
- @param response
- @return
  */
  public String toSettlement(HttpServletRequest request, HttpServletResponse response) throws Exception {
  List productCategoryVoList = productCategoryService.queryAllProductCategoryList();
  //封装返回
  request.setAttribute("productCategoryVoList", productCategoryVoList);
  return "/pre/settlement/toSettlement";
  }
public String settlement1(HttpServletRequest request, HttpServletResponse response) throws Exception {
ShoppingCart cart = getCartFromSession(request);
cart = cartService.calculate(cart);
request.getSession().setAttribute("cart", cart);
return "/pre/settlement/settlement1";
}
/**
- 跳转到购物车页面
- @param request
- @param response
- @return
  */
  public String settlement2(HttpServletRequest request, HttpServletResponse response) throws Exception {
  User user = getUserFromSession(request);
  return "/pre/settlement/settlement2";
  }
/**
- 生成订单
- @param request
- @param response
- @return
  */
  public Object settlement3(HttpServletRequest request, HttpServletResponse response) throws Exception {
  ShoppingCart cart = getCartFromSession(request);
  cart = cartService.calculate(cart);
  User user = getUserFromSession(request);
  ReturnResult result=checkCart(request);
  if(result.getStatus()==Constants.ReturnResult.FAIL){
  return result;
  }
  updateproduct(request,response);
  clearCart(request, response);
  return "/pre/settlement/settlement3";
  }
/**
- 清空购物车
- @param request
- @param response
  */
  public void updateproduct(HttpServletRequest request, HttpServletResponse response) throws Exception{
  ShoppingCart cart = getCartFromSession(request);
  cart = cartService.calculate(cart);
  Connection connection=DataSourceUtil.openConnection();
  ProductDao productDao=new ProductDaoImpl(connection);
  for (ShoppingCartItem item : cart.getItems()) {
  Product product=item.getProduct();
  int stock=product.getStock();
  int saleNumber=product.getSalenumber();
  int quantity=item.getQuantity();
  product.setStock( stock-quantity);
  product.setSalenumber(saleNumber+quantity);
  productDao.update(product);
  System.out.println("商品名称："+product.getName()+"商品库存："+product.getStock()+",商品销量："+product.getSalenumber());
  }
  }
public ReturnResult clearCart(HttpServletRequest request, HttpServletResponse response) throws Exception {
ReturnResult result = new ReturnResult();
//结账后清空购物车
request.getSession().removeAttribute("cart");
result.returnSuccess(null);
return result;
}
/**
- 修改购物车信息
- @param request
- @return
  */
  public ReturnResult modCart(HttpServletRequest request, HttpServletResponse response) throws Exception {
  ReturnResult result = new ReturnResult();
  HttpSession session = request.getSession();
  String id = request.getParameter("entityId");
  String quantityStr = request.getParameter("quantity");
  ShoppingCart cart = getCartFromSession(request);
  Product product=productService.findById(id);
  if(EmptyUtils.isNotEmpty(quantityStr)){
  if(Integer.parseInt(quantityStr)>product.getStock()){
  return result.returnFail("商品数量不足");
  }
  }
  cart = cartService.modifyShoppingCart(id, quantityStr, cart);
  session.setAttribute("cart", cart);//全部的商品
  return result.returnSuccess();
  }
/**
- 从session中获取购物车
- @param request
- @return
  */
  private ShoppingCart getCartFromSession(HttpServletRequest request) throws Exception {
  HttpSession session = request.getSession();
  ShoppingCart cart = (ShoppingCart) session.getAttribute("cart");
  if (cart == null) {
  cart = new ShoppingCart();
  session.setAttribute("cart", cart);
  }
  return cart;
  }
private ReturnResult checkCart(HttpServletRequest request) throws Exception {
ReturnResult result = new ReturnResult();
HttpSession session = request.getSession();
ShoppingCart cart = getCartFromSession(request);
cart = cartService.calculate(cart);
for (ShoppingCartItem item : cart.getItems()) {
Product product=productService.findById(item.getProduct().getId()+"");
if(product.getStock()<item.getQuantity()){
return result.returnFail(product.getName()+"商品数量不足");
}
}
return result.returnSuccess();
}
/**
- @param request
- @return
  */
  private User getUserFromSession(HttpServletRequest request) {
  HttpSession session = request.getSession();
  User user = (User) session.getAttribute("loginUser");
  return user;
  }
  }
  ////
  package com.skeyedu.mall.web.pre;

import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.param.ProductParam;
import com.skeyedu.mall.service.product.ProductCategoryService;
import com.skeyedu.mall.service.product.ProductCategoryServiceImpl;
import com.skeyedu.mall.service.product.ProductService;
import com.skeyedu.mall.service.product.ProductServiceImpl;
import com.skeyedu.mall.utils.Pager;
import com.skeyedu.mall.utils.ProductCategoryVo;
import com.skeyedu.mall.web.AbstractServlet;

@WebServlet(urlPatterns = {"/Home"}, name = "Home")
public class HomeServlet extends AbstractServlet {

private ProductService productService;
private ProductCategoryService productCategoryService;

public void init() throws ServletException {
    productService = new ProductServiceImpl();
    productCategoryService = new ProductCategoryServiceImpl();
}

/**
 * 商城主页的方法
 * @param request
 * @param response
 * @return
 */
public String index(HttpServletRequest request, HttpServletResponse response)throws Exception {
    //查询商品分裂
    List<ProductCategoryVo> productCategoryVoList = productCategoryService.queryAllProductCategoryList();
    //查询一楼
    for (ProductCategoryVo vo : productCategoryVoList) {
        ProductParam params = new ProductParam();
        params.setCategoryId(vo.getProductCategory().getId());
        params.openPage(0,7);
        List<Product> productList = productService.queryProductsList(params);
        vo.setProductList(productList);
    }
    //封装返回
    request.setAttribute("productCategoryVoList", productCategoryVoList);
    return "/pre/index";
}

@Override
public Class getServletClass() {
    return HomeServlet.class;
}

}

////
package com.skeyedu.mall.web.pre;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.skeyedu.mall.entity.User;
import com.skeyedu.mall.service.user.UserService;
import com.skeyedu.mall.service.user.UserServiceImpl;
import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.ReturnResult;
import com.skeyedu.mall.utils.SecurityUtils;
import com.skeyedu.mall.web.AbstractServlet;
@WebServlet(urlPatterns = { "/Login" }, name = "Login")
public class LoginServlet extends AbstractServlet{
//注入用户业务类
private UserService userService;

public void init() throws ServletException {
    userService = new UserServiceImpl();
}
/**
 * 重写相关方法
 * @return
 */
@Override
public Class getServletClass() {
    return LoginServlet.class;
}
/**
 * 跳转到登陆界面
 * @param request
 * @param response
 * @return
 */
public String toLogin(HttpServletRequest request,HttpServletResponse response)throws Exception{
    return "/pre/login";
}
/**
 * 登陆的方法
 * @param request
 * @return
 */
public ReturnResult login(HttpServletRequest request,HttpServletResponse response)throws Exception{
    ReturnResult result=new ReturnResult();
    //参数获取
    String loginName=request.getParameter("loginName");
    String password=request.getParameter("password");
    User user=userService.findByLoginName(loginName);
    if(EmptyUtils.isEmpty(user)){
        result.returnFail("用户不存在");
    }else{
       if(user.getPassword().equals(SecurityUtils.md5Hex(password))){
           //登陆成功
           request.getSession().setAttribute("loginUser", user);
           result.returnSuccess("登陆成功");
       }else{
           result.returnFail("密码错误");
       }
    }
    return result;
}
/**
 * 登陆的方法
 * @param request
 * @return
 */
public String loginOut(HttpServletRequest request,HttpServletResponse response)throws Exception{
    ReturnResult result=new ReturnResult();
    try {
        User user=(User)request.getSession().getAttribute("loginUser");
        request.getSession().removeAttribute("loginUser");
        // 清除购物车
        request.getSession().removeAttribute("cart");
        request.getSession().removeAttribute("cart2");
    } catch (Exception e) {
        e.printStackTrace();
    }
    result.returnSuccess("注销成功");
    return "/pre/login";
}

}

///
package com.skeyedu.mall.web.pre;

import java.util.ArrayList;
import java.util.List;

import com.skeyedu.mall.entity.Product;
import com.skeyedu.mall.service.product.ProductCategoryService;
import com.skeyedu.mall.service.product.ProductCategoryServiceImpl;
import com.skeyedu.mall.service.product.ProductService;
import com.skeyedu.mall.service.product.ProductServiceImpl;
import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.Pager;
import com.skeyedu.mall.utils.ProductCategoryVo;
import com.skeyedu.mall.web.AbstractServlet;

@WebServlet(urlPatterns = {"/Product"}, name = "Product")
public class ProductServlet extends AbstractServlet {

private ProductService productService;
private ProductCategoryService productCategoryService;


public void init() throws ServletException {
    productService = new ProductServiceImpl();
    productCategoryService=new ProductCategoryServiceImpl();
}

/**
 * 查询商品列表
 *
 * @param request
 * @param response
 * @return
 */
public String queryProductList(HttpServletRequest request, HttpServletResponse response) throws Exception{
    String category = request.getParameter("category");
    String levelStr = request.getParameter("level");
    String currentPageStr = request.getParameter("currentPage");
    String keyWord = request.getParameter("keyWord");
    //获取页大小
    String pageSizeStr = request.getParameter("pageSize");
    int rowPerPage = EmptyUtils.isEmpty(pageSizeStr) ? 20:Integer.parseInt(pageSizeStr);
    int currentPage = EmptyUtils.isEmpty(currentPageStr) ? 1 : Integer.parseInt(currentPageStr);
    int  level=EmptyUtils.isNotEmpty(levelStr)?Integer.parseInt(levelStr):0;
    int total = productService.getProductRowCount(category,level,keyWord);
    Pager pager = new Pager(total, rowPerPage, currentPage);
    pager.setUrl("/Product?action=queryProductList&level="+level+"&category="+(EmptyUtils.isEmpty(category)?"":category));
    List<ProductCategoryVo> productCategoryVoList = productCategoryService.queryAllProductCategoryList();
    List<Product> productList = productService.getProductsByCategory(EmptyUtils.isEmpty(category)?0:Integer.parseInt(category),level,pager,keyWord);
    request.setAttribute("productList", productList);
    request.setAttribute("pager", pager);
    request.setAttribute("total", total);
    request.setAttribute("keyWord", keyWord);
    request.setAttribute("productCategoryVoList", productCategoryVoList);
    return "/pre/product/queryProductList";
}
/**
 *
 * @param request
 * @param response
 * @return
 */
public String queryProductList1(HttpServletRequest request, HttpServletResponse response) throws Exception{
    String category = request.getParameter("category");
    String levelStr = request.getParameter("level");
    String currentPageStr = request.getParameter("currentPage");
    String keyWord = request.getParameter("keyWord");
    keyWord = new String(request.getParameter("keyWord").getBytes("iso8859-1"), "utf-8");
    //获取页大小
    String pageSizeStr = request.getParameter("pageSize");
    int rowPerPage = EmptyUtils.isEmpty(pageSizeStr) ? 20:Integer.parseInt(pageSizeStr);
    int currentPage = EmptyUtils.isEmpty(currentPageStr) ? 1 : Integer.parseInt(currentPageStr);
    int  level=EmptyUtils.isNotEmpty(levelStr)?Integer.parseInt(levelStr):0;
    int total = productService.getProductRowCount(category,level,keyWord);
    Pager pager = new Pager(total, rowPerPage, currentPage);
    pager.setUrl("/Product?action=queryProductList&level="+level+"&category="+(EmptyUtils.isEmpty(category)?"":category));
    List<ProductCategoryVo> productCategoryVoList = productCategoryService.queryAllProductCategoryList();
    List<Product> productList = productService.getProductsByCategory(EmptyUtils.isEmpty(category)?0:Integer.parseInt(category),level,pager,keyWord);
    request.setAttribute("productList", productList);
    request.setAttribute("pager", pager);
    request.setAttribute("total", total);
    request.setAttribute("keyWord", keyWord);
    request.setAttribute("productCategoryVoList", productCategoryVoList);
    return "/pre/product/queryProductList";
}

public String queryProductDeatil(HttpServletRequest request, HttpServletResponse response) throws Exception{
    String id = request.getParameter("id");
    Product product = productService.findById(id);
    List<ProductCategoryVo> productCategoryVoList = productCategoryService.queryAllProductCategoryList();
    request.setAttribute("product", product);
    request.setAttribute("productCategoryVoList", productCategoryVoList);
    addRecentProduct(request,product);
    return "/pre/product/productDeatil"; 
}
/**
 * 查询最近商品
 * @return
 */
private List<Product> queryRecentProducts(HttpServletRequest request)throws Exception{
    HttpSession session=request.getSession();
    List<Product> recentProducts= (List<Product>) session.getAttribute("recentProducts");
    if(EmptyUtils.isEmpty(recentProducts)){
        recentProducts=new ArrayList<Product>();
    }
    return recentProducts;
} 
/**
 * 添加最近浏览商品
 * @param request
 * @param product
 */
private void addRecentProduct(HttpServletRequest request,Product product)throws Exception{
    HttpSession session=request.getSession();
    List<Product> recentProducts=queryRecentProducts(request);
    //判断是否满了
    if(recentProducts.size()>0 &&  recentProducts.size()==10){
      recentProducts.remove(0);
    }
    recentProducts.add(recentProducts.size(),product);
    session.setAttribute("recentProducts",recentProducts);
}

@Override
public Class getServletClass() {
    return ProductServlet.class;
}

}
/////
package com.skeyedu.mall.web.pre;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(urlPatterns = { "/Register" }, name = "Register")
public class RegisterServlet extends AbstractServlet{

private UserService userService;
 public void init() throws ServletException {
        userService = new UserServiceImpl();
    }

public Class getServletClass() {
    return RegisterServlet.class;
}

public String toRegister(HttpServletRequest request,HttpServletResponse response)throws Exception{
    return "/pre/register";
}

public ReturnResult saveUserToDatabase(HttpServletRequest request,HttpServletResponse response)throws Exception{
    ReturnResult result=new ReturnResult();
    String loginName=request.getParameter("loginName");
    String password=request.getParameter("password");
    String password1=SecurityUtils.md5Hex(password);
    String userName=request.getParameter("userName");
    String sex=request.getParameter("sex");
    int sex1=Integer.valueOf(sex);
    String identityCode=request.getParameter("identityCode");
    String email=request.getParameter("email");
    String mobile=request.getParameter("mobile");
    User user=userService.findByLoginName(loginName);
    User user1=new User();
    if(EmptyUtils.isNotEmpty(user)){
        result.returnFail("用户已存在");
    }else{
        user1.setLoginName(loginName);
        user1.setPassword(password1);
        user1.setUserName(userName);
        user1.setSex(sex1);
        user1.setIdentityCode(identityCode);
        user1.setEmail(email);
        user1.setMobile(mobile);
        result.returnSuccess("注册成功！");
        userService.save(user1);
    }
    return result;
   
}

}
/////
package com.skeyedu.mall.web;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.skeyedu.mall.utils.EmptyUtils;
import com.skeyedu.mall.utils.PrintUtil;
import com.skeyedu.mall.utils.ReturnResult;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**

@ClassName AbstractServlet
@Description TODO(公共的Servlet抽象类)
@author Mr.Yan
@Email [email protected]
@Date 2019年5月8日上午10:43:24
@version 1.0.0
*/
public abstract class AbstractServlet extends HttpServlet {
/**
- author: Mr.Yan
- Qq: 7631990
- @Description (定义获取Servlet类的抽象方法)
- @return
  */
  public abstract Class getServletClass();
/**
- 将所有GET请求由POST来处理
  */
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
  doPost(req, resp);
  }
/**
- 处理POST请求
  */
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  String actionIndicator = req.getParameter("action");
  Method method = null;
  Object result = null;
  try {
  if (EmptyUtils.isEmpty(actionIndicator)) {
  result = execute(req, resp);
  } else {
  method = getServletClass().getDeclaredMethod(actionIndicator, HttpServletRequest.class, HttpServletResponse.class);
  result = method.invoke(this, req, resp);
  }
  toView(req, resp, result);
  } catch (NoSuchMethodException e) {
  String viewName = "404.jsp";
  req.getRequestDispatcher(viewName).forward(req, resp);
  } catch (Exception e) {
  e.printStackTrace();
  if (!EmptyUtils.isEmpty(result)) {
  if (result instanceof String) {
  String viewName = "500.jsp";
  req.getRequestDispatcher(viewName).forward(req, resp);
  } else {
  ReturnResult returnResult = new ReturnResult();
  returnResult.returnFail("系统错误");
  PrintUtil.write(returnResult, resp);
  }
  } else {
  String viewName = "500.jsp";
  req.getRequestDispatcher(viewName).forward(req, resp);
  }
  
  }
  }
/**
- author: Mr.Yan
- Qq: 7631990
- @Description (显示页面或异步返回)
- @param req
- @param resp
- @param result
- @throws IOException
- @throws ServletException
  */
  protected void toView(HttpServletRequest req, HttpServletResponse resp, Object result) throws IOException, ServletException {
  if (!EmptyUtils.isEmpty(result)) {
  if (result instanceof String) {
  String viewName = result.toString() + ".jsp";
  req.getRequestDispatcher(viewName).forward(req, resp);
  } else {
  PrintUtil.write(result, resp);
  }
  }
  }
/**
- author: Mr.Yan
- Qq: 7631990
- @Description (默认返回)
- @param req
- @param resp
- @return
  */
  public Object execute(HttpServletRequest req, HttpServletResponse resp) {
  return "pre/index";
  }
  }

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