纯jsp实现数据库的连接和验证登录

2021/5/3 2:26:16

编程Tag： 登录 title 数据库 jsp Insert Here

本文主要是介绍纯jsp实现数据库的连接和验证登录，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

纯jsp实现数据库连接并且登录

代码段

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>登录页面</title>
</head>
<body>
<form action="dologin.jsp" method="post">
<h3>登录界面</h3>
账户：<input name="username" type="text"><br>
密码：<input name="passward" type="password"><br>
<input type="submit" value="登录">
</form>
</body>
</html>

数据库连接和处理阶段

dologin.jsp

数据库连接名：root 密码自己设置的

数据库名：root

表明：user

<%@page import="java.sql.DriverManager"%>
<%@page import="com.mysql.jdbc.Driver"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%
		String name = request.getParameter("username");
		String pwd = request.getParameter("password");

		Class.forName("com.mysql.jdbc.Driver");
		Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/root", "root", "123456");
		PreparedStatement preparedStatement=connection.prepareStatement("select * from user where username=? and password=?");
		preparedStatement.setString(1,name);
		preparedStatement.setString(2,pwd);
		
		ResultSet resultSet=preparedStatement.executeQuery();
		if(resultSet.next()){
			response.sendRedirect("default.jsp");
		}else{
			response.sendRedirect("success.jsp");
		}
		connection.close();
		preparedStatement.close();
	%>

</body>
</html>

登录成功页面

success.jsp

<%@page import="java.sql.DriverManager"%>
<%@page import="com.mysql.jdbc.Driver"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
成功！！
</body>
</html>

登录失败页面

default.jsp

<%@page import="java.sql.DriverManager"%>
<%@page import="com.mysql.jdbc.Driver"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
失败！！
</body>
</html>

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纯jsp实现数据库的连接和验证登录

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