Java实现登录时cookie记住密码

素颜马尾好姑娘i 2023-10-03 00:52 11阅读 0赞

## 前言 ##

Java实现登录时cookie记住密码,下次登录不用重新输入密码,自动记住密码进行登录

## 编写代码 ##

首先写一个页面登录表单,还有它对应的js

<%--
      Created by IntelliJ IDEA.
      User: wx_weiyihe
      Date: 2021/8/30
      Time: 15:50
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <form method="post" action="/cookie">
            用户名:<input type="text" name="username" id="username"><br>
            密码:<input type="password" name="password" id="password"><br>
            <input type="checkbox" name="remember" id="remember" value="true">记住密码<br>
            <input type="submit" value="登录">
        </form>
    </body>
    <script>
        var cookies=document.cookie.split(";");
        function getCK(mkey) {
        
            for(var i=0;i<cookies.length;i++){
        
                var kv=cookies[i].split("=");
                if(kv[0].trim()==mkey){
        
                    return kv[1].trim();
                }
            }
            return  "";
        }
        window.onload=function(){
        
            var remember=getCK("remember");
            var username=getCK("username");
            var password=getCK("password");
            if(remember=='true'){
        
                var userNameInput=document.getElementById("username");
                userNameInput.value=username;
                var rememberInput=document.getElementById("remember");
                rememberInput.checked='checked';
                var passwordInput=document.getElementById("password");
                passwordInput.value=password;
            }
        }
    </script>
    </html>

java处理,用户名密码验证，判断是否勾选记住密码，并生成cookie，保存到客户端

@RequestMapping("/cookie")
        public void cookieTest(HttpServletRequest request, HttpServletResponse response) throws IOException {
        
            response.setHeader("content-type","text/html;charset=utf-8");
            String username=request.getParameter("username");
            String password=request.getParameter("password");
            String remember=request.getParameter("remember");
            //这里方便测试我把用户名密码写死了  用户名:sw 密码:123
            boolean success="sw".equals(username) && "123".equals(password);
            if(success){
        
                response.getWriter().write("登陆成功");
            }else{
        
                response.getWriter().write("登陆失败");
            }
            if("true".equals(remember) && success==true){
        
                Cookie ck1=new Cookie("remember", remember);
                ck1.setMaxAge(60*60);
                response.addCookie(ck1);
                Cookie ck2=new Cookie("username", username);
                ck1.setMaxAge(60*60);
                response.addCookie(ck2);
                Cookie ck3=new Cookie("password", password);
                ck1.setMaxAge(60*60);
                response.addCookie(ck3);
            }else{
        
                //清除cookie
                Cookie[] cks=request.getCookies();
                if(cks !=null){
        
                    for (Cookie c : cks) {
        
                        c.setMaxAge(0);
                        response.addCookie(c);
                    }
                }
            }
        }

## 查看效果 ##

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Jyc5qGD5am35am36YWx_size_20_color_FFFFFF_t_70_g_se_x_16]  
![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Jyc5qGD5am35am36YWx_size_20_color_FFFFFF_t_70_g_se_x_16 1]

## 退出去重新刷新页面,密码自动绑定 ##

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA6Jyc5qGD5am35am36YWx_size_15_color_FFFFFF_t_70_g_se_x_16]

## 总结 ##

把密码存入cookie是有盗号风险的，为了解决这个问题，推荐将密码加密，这样就能保证密码的安全了。欢迎大家一起研究

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