06_MVC项目实战

MVC项目实战

V	C	M
视图(View)	控制器(Controller)	模型(Model)
Jsp、EL和JSTL、html、css、js	servlet	JavaBean
接收用户的输入(表单) (被动)展示数据给用户	接收请求并做出响应 Servlet	实体类 entity 保存数据状态 dao 处理业务逻辑 service 公共类 common 过滤器 filter
login.jsp index.jsp UpdateUser.jsp /common/page.jsp /css/index.css	LoginServlet GetUsersServlet DeleteUserServlet ToUpdateUserServlet ToAddUserServlet DoUpdateUserServlet	BaseDao User Role UserDao UserDaoImpl RoleDao RoleDaoImpl UserService UserServiceImpl RoleService RoleServiceImpl EncodingFilter SessionFilter db.properties
松耦合，扩展性和维护性增强标准mvc--自定义mvc

项目：登陆查询+CRUD+分页+模糊查询+多表连接+过滤器

->ToAddUserServlet->UpdateUser.jsp->DoUpdateUserServlet

->ToUpdateUserServlet->UpdateUser.jsp->DoUpdateUserServlet

->DeleteUserServlet->GetUsersServlet

项目名：t38(Eclipse>Dynamic Web Project)

配置tomcat:Window>Preferences>server>RuntimeEnvironme

t38>BuildPath>Configure_>Library>addServerRuntime

配置Database:DataSourceExplorer>DatabaseConnections>New Oracle

properties: jdbc:oracle:thin:@localhost:1521:ORCL

Oracle Thin Driver Oracle 11--JAR List(ojdbc6.jar)

完全限定名：绝对路径 /项目名/ (包.类)

项目调试：Tomcat>Debug Server>浏览器localhost:8080/t38/login.jsp登陆>进入debug

F5 单步执行，观察变量、sql语句

PL/SQL Developer:T38@ORCL

创建用户：T38 (角色权限：connect resource)

创建表格Table：==>实体类entity

tb_user用户表:

ID NUMBER (PK_USER_ID Primary)

USERNAME VARCHAR(20)

PASSWORD VARCHAR(20)

STATUS NUMBER

CREATETIME DATE

ROLE_ID NUMBER (FK_USER_ROLE_ID Foreign TB_ROLE ID)

Sequences:SEQ_USER

tb_role角色表:

ID NUMBER (PK_ROLE_ID Primary)

ROLENAME VARCHAR(20)

select * from tb_user;

insert into tb_user values(seq_user.nextval,'admin','123',1,sysdate);

insert into tb_user values(seq_user.nextval,'sa','456',2,sysdate);

insert into tb_user values(seq_user.nextval,'zhangsan','456',1,sysdate);

insert into tb_user values(seq_user.nextval,'lisi','789',1,sysdate);

commit;

-- currentPage 当前页

-- pageSize 每页显示的条数

--rownum根据结果集生成

select t2.* from

(select t1.*,rownum rn from tb_user t1

where rownum <=(currPage*pageSize)) t2

where rn > (currentPage-1)*pageSize;

select t2.* from (select t1.*,rownum rn from tb_user t1

where rownum <=6) t2

where rn>3

select t2.* from

(select a.*,b.rolename,rownum rn

from tb_user a

inner join tb_role b

on a.role_id = b.id where rownum <=6) t2

where rn>3;

WebContent

/WEB-INF:/lib(ojdbc.6.jar、standard.jar、jstl.jar)

/css/index.css(index.jsp样式):

body,table,td,tr,form{

padding:0;

margin:0;

font-size:12px;

text-align:center;

}

.main_table{

width:98%;

border-collapse:collapse;

margin:0 auto;

}

.main_table .head_tr{

font-weight:bold;

background-color:#ccc;

}

.main_table td{

height:20px;

}

视图层View

login.jsp：登陆窗口界面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

function checkInput() {

//var oUsername = document.getElementById("username");

var oUsername = document.loginForm.username;//表单名称.其元素名称

var reg = /^\s*$/g; //正则表达式:/^ $/g

if (reg.test(oUsername.value)) {

alert("用户名不能为空！");

oUsername.focus();

return false;

}

var oPassword = document.loginForm.password;

if (reg.test(oPassword.value)) {

alert("密码不能为空！");

oPassword.focus();

return false;

}

return true;

}

</script>

</head>

<body>

用户名：<input type="text" name="username"

maxlength="20" /><br />

密码：<input type="password" name="password"

maxlength="20" /><br />

</form>

</body>

</html>

index.jsp：主界面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<body>

<tr>

<td>用户名：<input type="text" name="username" value=

"${condition.username }" /></td>

<td>密码：<input type="text" name="password" value=

"${condition.password }" /></td>

<option value="0" <c:if test="${condition.status == 0 }"> selected</c:if> >全部</option>

<option value="1" <c:if test="${condition.status == 1 }"> selected</c:if> >正常</option>

<option value="2" <c:if test="${condition.status == 2 }"> selected</c:if> >禁用</option>

</select>

</td>

<td>

</td>

</tr>

</table>

<hr />

</form>

</tr>

<c:forEach var="u" items="${requestScope.list }" varStatus="s">

<tr>

<td>${(pager.currentPage-1)*pager.pageSize + s.index +1 }</td>

<td>${u.username }</td>

<td>${u.password }</td>

<td>${u.status == 1 ? "正常"

:"<span style='color:red'>禁用</span>"}</td>

<td>${u.rolename }</td>

<td>

<fmt:formatDate value="${u.createtime }" pattern="yyyy-MM-dd"/>

</td>

<td>

<a href="javascript:if(confirm('您确定要删除吗？'))

{window.location.href='/t38/DeleteUserServlet?id=${u.id}'}">删除</a>

</td>

</tr>

</c:forEach>

</table>

<%@ include file="/common/page.jsp" %>

</body>

</html>

updateUser.jsp：增加/修改界面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

</head>

<body>

用户名：<input type="text" name="username" value=

"${item.username }" /><br />

密码：<input type="text" name="password" value=

"${item.password }" /><br />

角色：<select name="roleId">

<c:forEach var="role" items="${roleList }">

<option value="${role.id }"

<c:if test="${item.roleId == role.id }">selected

</c:if>>${role.rolename }

</option>

</c:forEach>

</select><br />

状态：<select name="status">

<option value="1"

<c:if test="${item.status == 1 }"> selected</c:if>

>正常</option>

<option value="2"

<c:if test="${item.status == 2 }"> selected</c:if>

>禁用</option>

</select><br />

</form>

</body>

</html>

/common/page.jsp:分页界面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

function jump(p,s){

//window.location.href="/t38/GetUsersServlet?currentPage="+p+"&p

ageSize="+s;

//document.searchForm.currentPage.value = 0;

//document.searchForm.ageSize.value = 0;

//document.searchForm.submit();

var oForm = document.searchForm || document.forms[0];

with(oForm){

currentPage.value = p;

pageSize.value = s;

submit();

}

</script>

<tr>

第<span style="color:red">${pager.currentPage }</span>

/${pager.totalPage }页

共${pager.totalCount }条

</td>

<c:choose>

<c:when test="${pager.currentPage == 1 }">

首页

</c:when>

<c:otherwise>

<a href="javascript:jump(${pager.currentPage-1 }

,${pager.pageSize})">上一页</a>

</c:otherwise>

</c:choose>

<c:choose>

<c:when test="${pager.totalPage == pager.currentPage }">

末页

</c:when>

<c:otherwise>

<a href="javascript:jump(${pager.currentPage+1 }

,${pager.pageSize})">下一页</a>

<a href="javascript:jump(${pager.totalPage }

,${pager.pageSize})">末页</a>

</c:otherwise>

</c:choose>

转到<input id="gPage" type="text" style="width:20px" value=

"${pager.currentPage }" /><input type="button" value="GO" onclick="jump(document.getElementById('gPage').value

,${pager.pageSize})" />

每页显示<select id="gSize" onchange="jump(1,this.value)">

<option value="3" <c:if test="${pager.pageSize == 3 }"> selected</c:if> >3</option>

<option value="5" <c:if test="${pager.pageSize == 5 }"> selected</c:if> >5</option>

<option value="10" <c:if test="${pager.pageSize == 10 }"> selected</c:if> >10</option>

<option value="20" <c:if test="${pager.pageSize == 20 }"> selected</c:if> >20</option>

</select>

</td>

</tr>

</table>

/WEB-INF/web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<display-name>t38</display-name>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

<filter-name>encodingFilter</filter-name>

<filter-class>com.hfxt.filter.EncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<filter-name>sessionFilter</filter-name>

<filter-class>com.hfxt.filter.SessionFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>sessionFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<display-name>LoginServlet</display-name>

<servlet-name>LoginServlet</servlet-name>

<servlet-class>com.hfxt.servlet.LoginServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>LoginServlet</servlet-name>

<url-pattern>/LoginServlet</url-pattern>

</servlet-mapping>

<display-name>GetUserServlet</display-name>

<servlet-name>GetUserServlet</servlet-name>

<servlet-class>com.hfxt.servlet.GetUserServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>GetUserServlet</servlet-name>

<url-pattern>/GetUserServlet</url-pattern>

</servlet-mapping>

<display-name>DeleteUserServlet</display-name>

<servlet-name>DeleteUserServlet</servlet-name>

<servlet-class>com.hfxt.servlet.DeleteUserServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DeleteUserServlet</servlet-name>

<url-pattern>/DeleteUserServlet</url-pattern>

</servlet-mapping>

<display-name>ToUpdateUserServlet</display-name>

<servlet-name>ToUpdateUserServlet</servlet-name>

<servlet-class>com.hfxt.servlet.ToUpdateUserServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ToUpdateUserServlet</servlet-name>

<url-pattern>/ToUpdateUserServlet</url-pattern>

</servlet-mapping>

<display-name>DoUpdateUserServlet</display-name>

<servlet-name>DoUpdateUserServlet</servlet-name>

<servlet-class>com.hfxt.servlet.DoUpdateUserServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>DoUpdateUserServlet</servlet-name>

<url-pattern>/DoUpdateUserServlet</url-pattern>

</servlet-mapping>

<display-name>ToAddUserServlet</display-name>

<servlet-name>ToAddUserServlet</servlet-name>

<servlet-class>com.hfxt.servlet.ToAddUserServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>ToAddUserServlet</servlet-name>

<url-pattern>/ToAddUserServlet</url-pattern>

</servlet-mapping>

</web-app>

Java Resources:/src

com.hfxt.entity

User:

public class User {

private int id;

private String username;

private String password;

private int status;

private Date createtime;

private int roleId;

private String rolename;//业务字段

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

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 int getStatus() {

return status;

}

public void setStatus(int status) {

this.status = status;

}

public Date getCreatetime() {

return createtime;

}

public void setCreatetime(Date createtime) {

this.createtime = createtime;

}

public String getRolename() {

return rolename;

}

public void setRolename(String rolename) {

this.rolename = rolename;

}

public int getRoleId() {

return roleId;

}

public void setRoleId(int roleId) {

this.roleId = roleId;

}

Role:

public class Role {

private int id;

private String rolename;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getRolename() {

return rolename;

}

public void setRolename(String rolename) {

this.rolename = rolename;

}

公共类：com.hfxt.common

Pager(分页):

package com.hfxt.common;

/**

* 分页bean 封装了分页所需的信息

* @author Ftmy

public class Pager {

private int currentPage = 1;//当前页，默认第一页

private int pageSize = 3;//每页显示的条数

private int totalCount = 0;//总条数

private int totalPage = 1;//总页数，计算得到

/**

* 计算总页数

* @return

public int getTotalPage() {

totalPage = totalCount % pageSize == 0

? totalCount / pageSize : totalCount / pageSize + 1;

return totalPage;

}

public int getCurrentPage() {

return currentPage;

}

public void setCurrentPage(int currentPage) {

if(currentPage < 1){

currentPage = 1;

}

this.currentPage = currentPage;

}

public int getPageSize() {

return pageSize;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public int getTotalCount() {

return totalCount;

}

public void setTotalCount(int totalCount) {

this.totalCount = totalCount;

}

db.properties:

driver=oracle.jdbc.driver.OracleDriver

url=jdbc:oracle:thin:@localhost:1521:ORCL

dbname=t38

dbpass=123456

DAO层：com.hfxt.dao

BaseDao(基类)：

public class BaseDao {

private ResourceBundle rb = ResourceBundle.getBundle("db");

/**

* 获取数据库连接

* @return

public Connection getConn(){

Connection conn = null;

try {

Class.forName(rb.getString("driver"));

conn = DriverManager.getConnection(rb.getString("url")

,rb.getString("dbname"),rb.getString("dbpass"));

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

return conn;

}

/**

* 关闭资源

* @param rs 结果集

* @param pstmt

* @param conn

public void closeAll(ResultSet rs,PreparedStatement pstmt,Connection conn){

if(rs != null){

try {

rs.close();

} catch (SQLException e) {

e.printStackTrace();

}

if(pstmt != null){

try {

pstmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

try {

if(conn != null && !conn.isClosed()){

conn.close();

}

} catch (SQLException e) {

e.printStackTrace();

}

/**

* 执行增、删、改的方法

* @param sql 要执行的sql

* @param args sql中的参数

* @return 受影响的行数

public int executeSql(String sql,Object...args){

int row = 0; //要返回的受影响的行数

Connection conn = null;

PreparedStatement pstmt = null;

try {

conn = getConn();

pstmt = conn.prepareStatement(sql);

if(args != null && args.length > 0){

for (int i = 0; i < args.length; i++) {

//给sql语句中参数赋值

pstmt.setObject(i+1, args[i]);

}

row = pstmt.executeUpdate();

} catch (Exception e) {

e.printStackTrace();

}finally{

closeAll(null, pstmt, conn);

}

return row;

}

/**

* 判断查询结果集中是否存在某列

* @param rs 查询结果集

* @param columnName 列名

* @return true 存在; false 不存在

public boolean isExistColumn(ResultSet rs, String columnName) {

try {

if (rs.findColumn(columnName) > 0) {

return true;

}

} catch (SQLException e) {

return false;

}

return false;

}

UserDao：

public interface UserDao {

/**

* 根据用户名查询用户对象

* @param username

* @return

public User getUserByUsername(String username);

/**

* 分页显示用户信息

* @param pager 分页bean

* @return

public List<User> getUsersByPage(Pager pager,User condition);

/**

* 根据sql获取条数

* @param sql

* @return

public int getCount(String sql);

/**

* 根据id查询用户信息

* @param id

* @return

public User getUserById(int id);

/**

* 查询所有的用户信息

* @return

public List<User> getAllUsers();

/**

* 删除用户

* @param id 要删除的记录的id

* @return 受影响的行数

public int deleteUser(int id);

/**

* 增加

* @param item 封装了要增加的数据的对象

* @return 受影响的行数

public int addUser(User item);

/**

* 修改

* @param item 封装了要修改的数据的对象

* @return 受影响的行数

public int updateUser(User item);

}

RoleDao:

public interface RoleDao {

public List<Role> getAllRoles();

}

com.hfxt.dao.impl(实现类)

UserDaoImpl：

/**

* 对tb_user表进行增、删、改、查等操作

* @author Administrator

public class UserDaoImpl extends BaseDao implements UserDao{

/**

* 根据sql查询用户信息

* @param sql 要执行的sql

* @param args sql的参数

* @return 用户集合

private List<User> getUsersBySql(String sql,Object...args){

List<User> list = new ArrayList<User>();

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

try {

conn = getConn();

pstmt = conn.prepareStatement(sql);

if(args != null && args.length >0){

for (int i = 0; i < args.length; i++) {

pstmt.setObject(i+1, args[i]);

}

rs = pstmt.executeQuery();

boolean exists = isExistColumn(rs, "rolename");

while(rs.next()){

User user = new User();

user.setId(rs.getInt("ID"));

user.setUsername(rs.getString("USERNAME"));

user.setPassword(rs.getString("PASSWORD"));

user.setStatus(rs.getInt("STATUS"));

user.setCreatetime(rs.getTimestamp("CREATETIME"));

user.setRoleId(rs.getInt("ROLE_ID"));

if(exists){

user.setRolename(rs.getString("ROLENAME"));

}

list.add(user);

}

} catch (Exception e) {

e.printStackTrace();

}finally{

closeAll(rs, pstmt, conn);

}

return list;

}

@Override

public User getUserByUsername(String username){

String sql = "select * from tb_user where username=?";

List<User> list = getUsersBySql(sql, username);

return list != null && list.size() > 0 ? list.get(0) : null;

}

@Override

public User getUserById(int id){

String sql = "select * from tb_user where id=?";

List<User> list = getUsersBySql(sql, id);

return list != null && list.size() > 0? list.get(0) : null;

}

@Override

public List<User> getAllUsers(){

String sql = "select * from tb_user";

return getUsersBySql(sql);

}

@Override

public int getCount(String sql){

int count = 0;//获取的条数

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

try {

conn = getConn();

pstmt = conn.prepareStatement(sql);

rs = pstmt.executeQuery();

if(rs.next()){

count = rs.getInt(1);

}

} catch (Exception e) {

e.printStackTrace();

}finally{

closeAll(rs, pstmt, conn);

}

return count;

}

@Override

public List<User> getUsersByPage(Pager pager,User condition){

String conditionSql = "";

String sql = "select t2.* from (select a.*,b.rolename,rownum rn

from tb_user a

inner join tb_role b

on a.role_id = b.id where rownum <=? ";

if(condition != null){

if(condition.getUsername() != null &&

!"".equals(condition.getUsername().trim())){

conditionSql += " and username like '%"

+condition.getUsername().trim()+"%'";

}

if(condition.getPassword() != null &&

!"".equals(condition.getPassword().trim())){

conditionSql += " and password ='"

+condition.getPassword().trim()+"'";

}

if(condition.getStatus() != 0){

conditionSql += " and status="+condition.getStatus();

}

sql += conditionSql;

sql += ") t2 where rn > ?";

List<User> list = getUsersBySql(sql,

pager.getCurrentPage() * pager.getPageSize(),

(pager.getCurrentPage() - 1) * pager.getPageSize());

String countSql = "select count(1) from tb_user where 1=1 ";

countSql += conditionSql;

int count = getCount(countSql);

pager.setTotalCount(count);

return list;

}

@Override

public int deleteUser(int id){

String sql = "delete from tb_user where id=?";

return executeSql(sql,id);

}

@Override

public int addUser(User item){

String sql = "insert into tb_user

values(seq_user.nextval,?,?,?,sysdate,?)";

return executeSql(sql, item.getUsername(),item.getPassword()

,item.getStatus(),item.getRoleId());

}

@Override

public int updateUser(User item){

String sql = "update tb_user set username=?,password=?

,status=?,role_id=? where id=?";

return executeSql(sql, item.getUsername(),item.getPassword(),item.getStatus(),item.getRoleId(),item.getId());

}

RoleDaoImpl:

public class RoleDaoImpl extends BaseDao implements RoleDao {

public List<Role> getAllRoles() {

String sql = "select * from tb_role";

return getRolesBySql(sql);

}

private List<Role> getRolesBySql(String sql,Object...args){

List<Role> list = new ArrayList<Role>();

Connection conn = null;

PreparedStatement pstmt = null;

ResultSet rs = null;

try {

conn = getConn();

pstmt = conn.prepareStatement(sql);

if (args != null && args.length > 0) {

for (int i = 0; i < args.length; i++) {

pstmt.setObject(i + 1, args[i]);

}

rs = pstmt.executeQuery();

while (rs.next()) {

Role role = new Role();

role.setId(rs.getInt("ID"));

role.setRolename(rs.getString("ROLENAME"));

list.add(role);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

closeAll(rs, pstmt, conn);

}

return list;

}

Service层：com.hfxt.service

UserService接口：

public interface UserService {

/**

* 检查登录

* @param username 传进来的用户名

* @param password 传进来的密码

* @return true：登录成功,返回用户信息User

public User checkLogin(String username,String password);

/**

* 根据id查询用户信息

* @param id

* @return

public User getUserById(int id);

/**

* 查询所有的用户信息

* @return

public List<User> getAllUsers();

/**

* 分页显示用户信息

* @param pager 分页bean

* @return

public List<User> getUsersByPage(Pager pager,User condition);

/**

* 删除用户

* @param id 要删除的记录的id

* @return 受影响的行数

public int deleteUser(int id);

/**

* 增加

* @param item 封装了要增加的数据的对象

* @return 受影响的行数

public int addUser(User item);

/**

* 修改

* @param item 封装了要修改的数据的对象

* @return 受影响的行数

public int updateUser(User item);

}

RoleService:

public interface RoleService {

public List<Role> getAllRoles();

}

com.hfxt.service.impl(实现类)

UserServiceimpl:

public class UserServiceImpl implements UserService{

private UserDao userDao = new UserDaoImpl();

@Override

public User checkLogin(String username,String password){

//根据用户名查询用户对象

User user = userDao.getUserByUsername(username);

if(user != null){ //用户名存在

if(user.getPassword().equals(password)){//密码也对

return user; //登录成功

}

return null; //登录失败

}

@Override

public User getUserById(int id){

return userDao.getUserById(id);

}

@Override

public List<User> getAllUsers(){

return userDao.getAllUsers();

}

@Override

public List<User> getUsersByPage(Pager pager,User condition){

return userDao.getUsersByPage(pager,condition);

}

@Override

public int deleteUser(int id){

return userDao.deleteUser(id);

}

@Override

public int addUser(User item){

return userDao.addUser(item);

}

@Override

public int updateUser(User item){

return userDao.updateUser(item);

}

RoleServiceImpl:

public class RoleServiceImpl implements RoleService {

private RoleDao roleDao = new RoleDaoImpl();

@Override

public List<Role> getAllRoles() {

return roleDao.getAllRoles();

}

Servlet层：com.hfxt.servlet

LoginServlet:

public class LoginServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//处理登录

String strUsername = request.getParameter("username");

String strPassword = request.getParameter("password");

//服务端验证

PrintWriter out = response.getWriter();

if(strUsername == null || "".equals(strUsername.trim())){

out.print("<script>alert('用户名不能为空！')

;window.location.href='/t38/login.jsp';</script>");

out.close();

return;

}

if(strPassword == null || "".equals(strPassword.trim())){

out.print("<script>alert('密码不能为空！')

;window.location.href='/t38/login.jsp';</script>");

out.close();

return;

}

//调用service层

UserService userService = new UserServiceImpl();

User loginUser = userService.checkLogin(strUsername

, strPassword);

if(loginUser != null){ //登录成功

//跳到一个servlet来抓取数据，把数据存入request中，转发到index.jsp

//response.sendRedirect("/t38/index.jsp");

//把用户的身份信息存入session中

HttpSession session = request.getSession();

session.setAttribute("loginUser", loginUser);

response.sendRedirect("/t38/GetUsersServlet");

}else{

out.print("<script>alert('用户名或密码错误！')

;window.location.href='/t38/login.jsp';</script>");

}

GetUsersServlet:

@WebServlet("/GetUsersServlet")

public class GetUsersServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//处理post请求参数的乱码

//request.setCharacterEncoding("UTF-8");

//接收查询参数

String strUsername = request.getParameter("username");

String strPassword = request.getParameter("password");

String strStatus = request.getParameter("status");

//封装查询条件

User condition = new User();

condition.setUsername(strUsername);

condition.setPassword(strPassword);

if(strStatus != null && !"".equals(strStatus.trim())){

condition.setStatus(Integer.parseInt(strStatus));

}

//调用service层

UserService userService = new UserServiceImpl();

//List<User> list = userService.getAllUsers();

Pager pager = new Pager();

String strCurrentPage = request.getParameter("currentPage");

String strPageSize = request.getParameter("pageSize");

if(strCurrentPage != null && !"".equals(strCurrentPage.trim())){

pager.setCurrentPage(Integer.parseInt(strCurrentPage));

}

if(strPageSize != null && !"".equals(strPageSize.trim())){

pager.setPageSize(Integer.parseInt(strPageSize));

}

List<User> list = userService.getUsersByPage(pager,condition);

//把list存入request中

request.setAttribute("list", list);

request.setAttribute("pager", pager);

request.setAttribute("condition", condition);

//只能转发

request.getRequestDispatcher("/index.jsp")

.forward(request, response);

}

ToAddUserServlet:

public class ToAddUserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

RoleService roleService = new RoleServiceImpl();

List<Role> roleList = roleService.getAllRoles();

request.setAttribute("roleList", roleList);

request.getRequestDispatcher("/updateUser.jsp")

.forward(request, response);

}

ToUpdateUserServlet:

public class ToUpdateUserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//调用service层

String strId = request.getParameter("id");

UserService userService = new UserServiceImpl();

User item = userService.getUserById(Integer.parseInt(strId));

RoleService roleService = new RoleServiceImpl();

List<Role> roleList = roleService.getAllRoles();

//把item存入request中

request.setAttribute("item", item);

request.setAttribute("roleList", roleList);

request.getRequestDispatcher("/updateUser.jsp")

.forward(request, response);

}

DoUpdateUserServlet:

public class DoUpdateUserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//处理响应的乱码

//response.setContentType("text/html;charset=UTF-8");

//处理增加、修改

//request.setCharacterEncoding("UTF-8");

//接收请求参数的值

String strId = request.getParameter("id");

String username = request.getParameter("username");

String password = request.getParameter("password");

String status = request.getParameter("status");

String roleId = request.getParameter("roleId");

//服务端验证(*)

//封装数据

User item = new User();

item.setUsername(username);

item.setPassword(password);

item.setStatus(Integer.parseInt(status));

item.setRoleId(Integer.parseInt(roleId));

//调用service层

UserService userService = new UserServiceImpl();

int row = 0;

if(strId == null || "".equals(strId.trim())){//add

row = userService.addUser(item);

}else{//update

item.setId(Integer.parseInt(strId));

row = userService.updateUser(item);

}

PrintWriter out = response.getWriter();

if(row > 0){

out.print("<script>alert('保存成功！')

;window.location.href='/t38/GetUsersServlet'</script>");

out.close();

return;

}else{

out.print("<script>alert('保存失败，请重试或联系管理员！')

;history.go(-1)</script>");

out.close();

}

DeleteUserServlet:

public class DeleteUserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doPost(request, response);

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

//处理响应的乱码

//response.setContentType("text/html;charset=UTF-8");

//删除操作

String strId = request.getParameter("id");

//做验证

PrintWriter out = response.getWriter();

if(strId == null || "".equals(strId.trim())){

out.print("<script>alert('参数错误！')

;window.location.href='/t38/GetUsersServlet'</script>");

out.close();

return;

}

//调用service层

UserService userService = new UserServiceImpl();

int row = userService.deleteUser(Integer.parseInt(strId));

if(row > 0){

response.sendRedirect("/t38/GetUsersServlet");

}else{

out.print("<script>alert('删除失败，请重试或联系管理员！')

;history.go(-1);</script>");

out.close();

}

过滤器：com.hfxt.filter

EncodingFilter：

public class EncodingFilter implements Filter {

private String encoding;

@Override

public void destroy() {

}

@Override

public void doFilter(ServletRequest request, ServletResponse

response,FilterChain filterChain) throws IOException,ServletException {

if (encoding == null || "".equals(encoding)){

encoding = "UTF-8";

}

//处理响应的乱码

response.setContentType("text/html;charset="+encoding);

//处理post请求参数的乱码

request.setCharacterEncoding(encoding);

//放过

filterChain.doFilter(request, response);

}

@Override

public void init(FilterConfig filterConfig) throws ServletException{

encoding = filterConfig.getInitParameter("encoding");

}

SessionFilter：

public class SessionFilter implements Filter {

@Override

public void destroy() {

}

@Override

public void doFilter(ServletRequest request, ServletResponse response,FilterChain filterChain) throws IOException, ServletException{

HttpServletRequest req = (HttpServletRequest) request;

HttpServletResponse res =(HttpServletResponse) response;

//定义个不需要验证身份的页面等

String[] excludeFiles = {"/login.jsp","/LoginServlet"

,".css",".jpg",".gif",".png"};

//尝试着去session中获取用户身份信息

HttpSession session = req.getSession();

User loginUser = (User) session.getAttribute("loginUser");

if(loginUser != null){

filterChain.doFilter(request, response);

}else{

String uri = req.getRequestURI();

boolean flag = false;

for(String file : excludeFiles){

if(uri.indexOf(file) !=-1){

flag = true;

break;

}

if(flag){

filterChain.doFilter(request, response);

}else{

//跳转到登录页

PrintWriter out = res.getWriter();

out.print("<script>alert('您还未登录或长时间未操作，请重新登

陆！');window.location.href='/t38/login.jsp'</script>");

out.close();

}

@Override

public void init(FilterConfig filterConfig) throws ServletException{

}

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