JSP 07课

package com.gd.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class BaseDao {


    //获取连接
    protected Connection getConnection(){
        Connection conn=null;
            try {
                Class.forName("com.mysql.jdbc.Driver");
                // 2.建立连接
                conn = DriverManager.getConnection(
                        "jdbc:mysql://localhost:3306/jdbcjsp", "root", "root");
            } catch (Exception e) {
                e.printStackTrace();
            } 
            return conn;
    }    
    

    
    
    //关闭连接
    protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){        
    try {
        if(rs != null)
            rs.close();
        if(ps != null)
            ps.close();
        if(con != null)
            con.close();
        
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
}

package com.gd.dao;

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

public class UsersDao extends BaseDao {
    // 登录功能
    public boolean login(String uname, String upwd) throws SQLException {
        // 获取连接
        Connection conn = getConnection();
        // 编写sql语句
        String sql = "select * from users where username=? and password=?";
        // 执行sql语句
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setString(1, uname);
        ps.setString(2, upwd);
        ResultSet rs = ps.executeQuery();
        if (rs.next()) {
            closeAll(conn, ps, rs);
            return true;
        } else {
            closeAll(conn, ps, rs);
            return false;

        }
    }
//    public static void main(String[] args) {
//        UsersDao ud=new UsersDao();
//        try {
//            System.out.println(ud.login("tom", "456"));
//        } catch (SQLException e) {
//            // TODO Auto-generated catch block
//            e.printStackTrace();
//        }
//    }

}

package com.gd.entity;

public class Users {
    String username;
    String password;
    String email;
    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 getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

}

package com.gd.entity;

public class Msg {
    int msgid;
    String usernname;
    String title;
    String msgcontent;
    int state;
    String sendto;
    String msg_create_date;
    public int getMsgid() {
        return msgid;
    }
    public void setMsgid(int msgid) {
        this.msgid = msgid;
    }
    public String getUsernname() {
        return usernname;
    }
    public void setUsernname(String usernname) {
        this.usernname = usernname;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getMsgcontent() {
        return msgcontent;
    }
    public void setMsgcontent(String msgcontent) {
        this.msgcontent = msgcontent;
    }
    public int getState() {
        return state;
    }
    public void setState(int state) {
        this.state = state;
    }
    public String getSendto() {
        return sendto;
    }
    public void setSendto(String sendto) {
        this.sendto = sendto;
    }
    public String getMsg_create_date() {
        return msg_create_date;
    }
    public void setMsg_create_date(String msg_create_date) {
        this.msg_create_date = msg_create_date;
    }

}

<%@page import="com.gd.dao.UsersDao"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
    request.setCharacterEncoding("utf-8");
    String uname = request.getParameter("uname");
    String upwd = request.getParameter("upwd");
    UsersDao ud = new UsersDao();
    if (ud.login(uname, upwd))
        request.getRequestDispatcher("main.jsp").forward(request, response);
    else
        response.sendRedirect("index.jsp");
%>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
   <form action="dologin.jsp" method="post">
用户名:<input type="text" name="uname" value="小白" /><Br>
密码 ：<input type="password" name="upwd" value="88888"/><br>

<input type="submit" value="登录">

</form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="java.sql.SQLException"%>
<%@page import="com.gd.dao.BaseDao"%>
<%@page import="com.gd.entity.Msg"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.ResultSet"%>

<%@page import="java.sql.Connection"%>
<body>
    <%
        String uname = request.getParameter("uname");
        session.setAttribute("uname", uname);
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            //加载驱动 

            String url = "jdbc:mysql://localhost:3306/jdbcjsp";
            String user = "root";
            String password = "root";
            conn = DriverManager.getConnection(url,user,password);
            ps = conn.prepareStatement("select * from msg where usernname=?");
            ps.setString(1, uname);
            rs = ps.executeQuery();
    %>
    <table>
        <tr>
        <td>msgid</td>      
        <td>username</td>
            <td>title</td>
            <td>msgcontent</td>
            <td>state</td>
            <td>sendto</td>
            <td>msg_create_date</td>
        </tr>
        <%
            while (rs.next()) {
        %>
        <tr>
            <td><%=rs.getString("username")%></td>
            <td><%=rs.getString("title")%></td>
            <td><%=rs.getString("msgcontent")%></td>

            <td>
 <%

     String title=rs.getString("title");
     session.setAttribute("title", title);
     
 %>
            </td>
            <td><%=rs.getString("sendto")%></td>
            <td><%=rs.getString("msg_create_date")%></td>
        </tr>
        <%
            }
        %>
    </table>
    <br>

    <%
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (rs != null) {
                try {
                    rs.close();
                } catch (SQLException e) { // ignore }
                    rs = null;
                }
            }
            if (ps != null) {
                try {
                    ps.close();
                } catch (SQLException e) { // ignore }
                    ps = null;
                }
            }
            if (conn != null) {
                try {
                    conn.close();
                } catch (SQLException e) { // ignore }
                    rs = null;
                }
            }
        }
    %>

</body>
</html>