JSP代码 MVC编程开发实例

我之前一直搞不明白JAVABEAN在MVC中到底充当一个什么角色。现在来看一个实例

定义一个JAVABEAN
package com.bean;
public class User {
    private String userName;
    private String userPwd;
    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPwd() {
        return userPwd;
    }

    public void setUserPwd(String userPwd) {
        this.userPwd = userPwd;
    }
}

JAVABEAN的作用：是一个PO对象之前我以为是VO对象。搞错了！

恩我们可以这样来理解JAVABEAN的作用其实就是用来传递数据的一个东西。在我们这次PHPCMS项目中相当于一个结果集的传输。控制器接收到一个来自M层的数据之后如何传递到视图层作渲染处理。可以依据这样的方式。

再来看我们的Action类
package com.dao;
import java.sql.*;
import com.bean.User;
public class DAO {
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;
    PreparedStatement pstmt = null
    public DAO(){
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = getConnection();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public Connection getConnection(){
        String url = "jdbc:mysql://localhost:3306/person";
        String user = "root";
        String password = "123456";
        try {
            conn = DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }

    public int addPerson(User user){
        int flag = 0;
        String sql = "insert into user(user_name,user_pwd) values(?,?)";
        try {
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, user.getUserName());
            pstmt.setString(2, user.getUserPwd());
            flag = pstmt.executeUpdate();

        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return flag;
    }

    public ResultSet showPer