Jsp实现注册登录（连接Mysql）

Posted 2023-02-20 蓝Builing

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Jsp实现注册登录（连接mysql）

最近在学jsp连接数据库，存个档吧

先在mysql里创建一个数据库
创建表
写一个用户注册的页面

registered.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册</title>
</head>
<body>
<form method="post" action="zc.jsp">
    输入用户名：<input type="text" name="username"><br>
    输入密码：<input type="text" name="userpwd"><br>
    确认密码：<input type="text" name="cuserpwd"><br>
    <input type="submit" value="注册">
</form>
</body>
</html>

读取用户的信息写入到数据库，完成注册
zc.jsp

<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.Statement" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.SQLException" %> 
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    //获取用户输入信息
    request.setCharacterEncoding("utf-8");
    String username=request.getParameter("username");
    String userpwd=request.getParameter("userpwd");
    String cuserpwd=request.getParameter("cuserpwd");
    //判断两次密码是否相同
    if (cuserpwd.equals(userpwd))   
        Connection conn = null;
        Statement stmt = null;
        try 
            //连接驱动
            Class.forName("com.mysql.jdbc.Driver");
         catch (ClassNotFoundException e) 
            e.printStackTrace();
        
        //建立数据库连接
        String url="jdbc:mysql://localhost:3306/bookstore_demo";
        //数据库账号
        String user="root";
        //数据库密码
        String upwd="lj20011028";
        try 
            conn= DriverManager.getConnection(url,user,upwd);
            //创建发射器
            stmt=conn.createStatement();
            //创建sql语句
            String sql="insert into yonghu(username,userpwd) value ('"+username+"','"+userpwd+"')";
            //发送sql语句并接收结果
            int count = stmt.executeUpdate(sql);
            if (count>0)
                out.print("注册成功");
                out.print("<a href='logoin.jsp'>登录</a>");
            
            else
                out.print("注册失败");
            
            //关闭资源
            stmt.close();
            conn.close();

         catch (SQLException e) 
            e.printStackTrace();
        
    
    else 
        out.print("注册失败");
    
%>
</body>
</html>

再写一个用户登录界面

logoin.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>logoin</title>
</head>
<body>
    <form action="logoin_yz.jsp" method="post">
        用户名：<input type="text" name="username"><br>
        密码：<input type="password" name="userpwd" ><br>
        <input type="submit" value="登录">
    </form>
</body>
</html>

获取用户输入的信息，在数据库中查询有相同记录则登陆成功

logoin_yz.jsp

<%@ page import="java.sql.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title></title>
</head>
<body>
<%
    //获取用户输入信息
    request.setCharacterEncoding("utf-8");
    String username=request.getParameter("username");
    String userpwd=request.getParameter("userpwd");
    Connection conn = null;
    Statement stmt = null;
    try 
        //连接驱动
        Class.forName("com.mysql.jdbc.Driver");
     catch (ClassNotFoundException e) 
        e.printStackTrace();
    
    //建立数据库连接
    String url = "jdbc:mysql://localhost:3306/bookstore_demo";
    //数据库账号
    String uname="root";
    //数据库密码
    String upwd="lj20011028";

    try 
        conn = DriverManager.getConnection(url, uname, upwd);
        //创建发射器
        stmt = conn.createStatement();
        //创建sql语句
        String sql = "select*from bookstore_demo.yonghu where username='"+username+"' and userpwd='"+userpwd+"'";
        //发送sql语句并接收结果
        ResultSet rs = stmt.executeQuery(sql);
        if (rs.next()) 
            out.print("登陆成功");
         else 
            out.print("登陆失败");
        
        rs.close();
    
    catch (SQLException e) 
        e.printStackTrace();
    

%>
</body>
</html>