MVC的一个简单实例

基本思路：

　　一个Regist.jsp注册页面，用于收集用户信息，发送请求给控制器Servlet；控制器层Servlet封装模型层对象 jBean，并调用其方法regiser实现用户信息的保存；模型层JavaBean.java 接收控制器层的对象，完成对数据库的操作。

话不多说，上代码。

首先有个数据库访问公共类，以后凡是操作数据库的页面都可以调用。不容多说：

Unilt.java

/**
 * 
 */
package javaBeanServlet;

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

/**
 * @author Administrator
 *
 */
public class Unilt {
    private static final String URL = "jdbc:mysql://localhost:3306/userdb";
    private static final String USER = "root";
    private static final String PASSWORD = "111111";
    protected static Statement s = null;
    protected static ResultSet rs = null;
    protected static Connection coon = null;
    public static synchronized Connection getConnection() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            coon = DriverManager.getConnection(URL, USER, PASSWORD);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return coon;
    }
    public static int executeUpdate(String sql) {
        int result = 0;
        try {
            s = getConnection().createStatement();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            result = s.executeUpdate(sql);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return result;
    }
    public static ResultSet executeQuery(String sql) {
        try {
            s = getConnection().createStatement();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            rs = s.executeQuery(sql);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return rs ;
    }
    public static PreparedStatement executePreparedStatement(String sql) {
        PreparedStatement ps = null;
        try {
            ps = getConnection().prepareStatement(sql);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return ps;
    }
    public static void rollback() {
        try {
            getConnection().rollback();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static void close() {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (s != null) {
            try {
                s.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        if (coon != null) {
            try {
                coon.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

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