一个简单的统计学分系统的小程序

一个学分系统的小程序

jsp页面我就不写了， 下面我只写业务类吧

、

LoginAction.java

package com.cn.attence.action;

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

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
	private String username;
	private String password;
	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 String execute() throws Exception{
		
		DBConnect db = new DBConnect();
		Connection conn = db.getConnection();
		Statement stmt = conn.createStatement();
		List list = new ArrayList();
		String sql = "select * from userinfo";
		ResultSet rs = stmt.executeQuery(sql);
	while(	rs.next()){;
		if(rs.getString("username").equals(this.username)  && rs.getString("password").equals(this.password))
			return SUCCESS;	
	}
		return ERROR;
	}
}

注册控制层RegisterAction.java

package com.cn.attence.action;

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

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {
	private String username;
	private String password;
	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;
	}
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		DBConnect db = new DBConnect();
		Connection conn = db.getConnection();
		Statement stmt = conn.createStatement();
		List list = new ArrayList();
		String sql = "insert into userinfo(username,password)  values('"+username+"','"+password+"')";
		stmt.executeUpdate(sql);	
		conn.commit();
		return SUCCESS;
	
	}
}

修改UpdatestudentAction.java

package com.cn.attence.action;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class UpdatestudentAction extends ActionSupport{
	private int id;
	private String name;
	private String classe;
	private int checke;
	private String num;
	private String sum1;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getSum1() {
		return sum1;
	}
	public void setSum1(String sum1) {
		this.sum1 = sum1;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getClasse() {
		return classe;
	}
	public void setClasse(String classe) {
		this.classe = classe;
	}
	public int getChecke() {
		return checke;
	}
	public void setChecke(int checke) {
		this.checke = checke;
	}
	public String getNum() {
		return num;
	}
	public void setNum(String num) {
		this.num = num;
	}
	public String execute() throws SQLException, FileNotFoundException, IOException, ClassNotFoundException 
	{	
	DBConnect db = new DBConnect();
	Connection conn = db.getConnection();

	List list = new ArrayList();
	String sql = "update  studentinfo  set name=?,classe=?,checke=?,num=?,sum1=?  where id="+id;
	System.out.println("sql语句是"+sql);	
	PreparedStatement stmt = conn.prepareStatement(sql);
	stmt.setString(1, name);
	stmt.setString(2, classe);
	stmt.setInt(3, checke);
	stmt.setString(4, num);
	stmt.setString(5, sum1);	
	stmt.executeUpdate();	
	conn.close();
	ActionContext ctx = ActionContext.getContext();
	Map session = ctx.getSession();
	session.put("list", list);
	return SUCCESS;
	}
}

ShowstudentAction.java

package com.cn.attence.action;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.cn.attence.dao.DBConnect;
import com.cn.entity.StudentCredit;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ShowstudentAction extends ActionSupport{
public String execute() throws Exception{
		
		DBConnect db = new DBConnect();
		Connection conn = db.getConnection();
		Statement stmt = conn.createStatement();
		String sql = "select * from studentinfo";
		ResultSet rs = stmt.executeQuery(sql);
		List list = new ArrayList();
		while(rs.next()){
			StudentCredit student =new StudentCredit();		
			student.setId(rs.getInt("id"));
			student.setName(rs.getString("name"));
			student.setNum(rs.getString("num"));
			student.setClasse(rs.getString("classe"));
			student.setChecke(rs.getInt("checke"));
			list.add(student);
		}
		conn.close();
		ActionContext ctx = ActionContext.getContext();
		Map session = ctx.getSession();
		session.put("list", list);
		return SUCCESS;
	}
}

删除操作：DeleteAction.java

package com.cn.attence.action;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.cn.attence.dao.DBConnect;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DeleteAction extends ActionSupport{

	public String execute() throws SQLException, FileNotFoundException, IOException, ClassNotFoundException 
	{
		HttpServletRequest request = ServletActionContext.getRequest();
		String  id=request.getParameter("id");
		System.out.println("id号是"+id);
		ActionContext ct = ActionContext.getContext();	
		DBConnect db = new DBConnect();
		Connection conn = db.getConnection();
		String sql = "delete from studentinfo where id ="+id+"";
		System.out.println(sql);
		Statement stmt = conn.createStatement();
		stmt.executeUpdate(sql);
		
		conn.commit();
		return SUCCESS;
	}
}

DBConnect.java

package com.cn.attence.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBConnect {
	public static Connection getConnection() {
		String url = "jdbc:mysql://localhost:3306/studentAttence?useUnicode=true&characterEncoding=gbk";
		String user = "root";
		String psw = "root";
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		try {
			conn = DriverManager.getConnection(url, user, psw);
			conn.setAutoCommit(false);
			return conn;
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}
}

StudentDao.java

package com.cn.attence.dao;

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

import com.cn.entity.StudentCredit;
import com.opensymphony.xwork2.ActionContext;



public class StudentDao {
	//条件查询
	/** 
	 *  通过id 取得某个学生信息 
	 * @param id 
	 * @return 
	 */  
	public StudentCredit getSuById(int id) throws Exception{ 
		StudentCredit student=null;
		DBConnect db = new DBConnect();
		Connection conn = db.getConnection();
		Statement stmt = null;
		try {
			stmt = conn.createStatement();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		String sql = "select * from studentinfo where id="+id;
		System.out.println("条件查询sql语句"+sql);
		ResultSet rs = stmt.executeQuery(sql);		
		if(rs.next()){
			 student =new StudentCredit();
	    	student.setId(rs.getInt("id"));
			student.setName(rs.getString("name"));
			student.setNum(rs.getString("num"));
			student.setClasse(rs.getString("classe"));
			student.setChecke(rs.getInt("checke"));	
			student.setSum1(rs.getString("sum1"));	
			System.out.println("对象值"+student.getSum1());
		}
		
		conn.close();
		return student;  
	}
}