4.12 

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
 
  <body>
  <form action="doLogin.jsp" method="post" >
    用户名:<input type="text" name="username"/>
    <br>
    密码:<input type="password"  name="password"/>
    <br>
    <input type="submit" value="登录">
  </form>
  </body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>接受密码并验证</title>
</head>
<body>
<%                     //获取用户账户输入名和密码
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    System.out.println(username);
                        //获取两个数据库里的密码
    String rightUsername ="";
    String rightPassword ="";
                        //连接数据库
 
        //连接数据库
    try {
        Class.forName("com.mysql.jdbc.Driver");//注册驱动
        Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/firsttry", "root", "root"); //获取连接对象
 
        PreparedStatement preparedStatement = connection.prepareStatement("select * from jsp where username=?");//执行sql语句对象
        preparedStatement.setString(1, "zhangsan");
        ResultSet resultSet = preparedStatement.executeQuery();  //执行并查询
        System.out.println(resultSet);
        while (resultSet.next()) {
            rightUsername = resultSet.getString("username");
            rightPassword = resultSet.getString("userpassword");
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
 
 
        if (username.equals(rightUsername) && password.equals(rightPassword)) {
            session.setAttribute("username", username);
            response.sendRedirect("success.jsp");
        } else {
            response.sendRedirect("index.jsp");
        }
 
%>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
String username = (String) session.getAttribute("username");
%>
        欢迎您！<%=username%>登录成功
</body>
</html>

 

posted @ 2021-04-12 16:16  校荣会蹦迪  阅读(81)  评论(3)    收藏  举报