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How to use AJax and json to implement login verification in php
- 尊渡假赌尊渡假赌尊渡假赌Original
- 2023-06-19 13:28:371778browse
php uses AJax and json to implement login verification: 1. Create a jsp sample file and import jquery dependency and fastjson dependency files; 2. Create a new login.js file to obtain the user name and password text content; 3. , create a new controller class, query whether the user exists and convert the object into a json string type and return it to the js file; 4. js determines whether it is successful and then jumps to the page.
Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.
AJAX and Json complete user login
1. Import jquery dependencies and fastjson dependencies in advance
2. Create a new jsp page
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="js/jquery-3.4.1.js"></script>
<script type="text/javascript" src="login.js"></script>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 不使用submit，用ajax+json实现局部刷新，实现登录 -->
<form action="" method="post">
<span id="msg"></span><br/>
用户姓名:<input type="text" name="username" id="username"><br/>
用户密码:<input type="text" name="password" id="password"><br/>
<input type="button" value="登录" id="submit">
</form>
</body>
</html>
3. Create a new js file
$(function(){
$("#submit").click(function(){
var username = $("#username").val();
var password = $("#password").val();
//获取json格式的文本内容
$.post("login?mark=login",{"username":username,"password":password},
function(data){
if(data.log){
/*输入要跳转的页面*/
/*window.location.href="https://www.php.cn/link/3729ff995bfa947622cdf0612e57c332";*/
alert("success");
}else{
$("#msg").css("color","red").html(data.msg);
}
},"json"
);
});
});
4. Create a new controller class
Query whether This user exists
Convert the map object into a json string type, write it to the memory, and return it to the js file
private void login(HttpServletRequest request, HttpServletResponse response) throws Exception {
//
response.setContentType("text/html;charset=utf-8");
PrintWriter writer = response.getWriter();
String msg = "";
String username = request.getParameter("username");
String password = request.getParameter("password");
Map<String, Object> map = new HashMap();
//查询是否存在此用户
User user = new LoginServer().login(username, password);
if(user!=null) {
map.put("log", true);
map.put("msg", "成功");
}else {
map.put("log", false);
map.put("msg", "用户名或者密码错误");
}
//把map对象转换成json字符串类型，写入到内存，并返回给js文件
writer.write(JSON.toJSONString(map));
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