项目9-网页聊天室2（登录）

0.前端知识储备

Ajax请求中的async:false/true的作用 - front-gl - 博客园 (cnblogs.com)

01.前端页面展示

02.后端代码

2.1 CONTROLLER

@RequestMapping("/login")
    public Result login(String username, String password, HttpSession httpSession){
        User user= userMapper.selectByUsername(username);
        if(!StringUtils.hasLength(username)||!StringUtils.hasLength(password)){
            return Result.fail(Constant.PASSWORD_OR_NULL,"密码或账号为空");
        }else if(user==null){
            return Result.fail(Constant.MESSAGE_NULL,"用户信息为空");
        }else if(!bCryptPasswordEncoder.matches(password,user.getPassword())){
            return Result.fail(Constant.PASSWORD_WRONG,"账号或密码错误");
        }
        user.setPassword("");
        httpSession.setAttribute(Constant.USERINFO_SESSION_KEY,user);
        return Result.success(user);
    }

2.2 后端测试

成功！！！

03.前端代码

3.1 login.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>登录界面</title>
    <link rel="stylesheet" href="css/common.css">
    <link rel="stylesheet" href="css/login.css">
  </head>
  <body>
    <!-- 导航栏 -->
    <div class="nav">
        网页聊天
    </div>
    <div class="container">
      <h1>用户登录</h1>
      <form>
        <br>
        <label for="username">用户名</label><br>
        <input type="text" name="username" id="username" class="input"><br>
        <label for="pwd">密码</label><br>
        <input type="password" name="" id="password" class="input">
        <button type="submit" class="submit" id="submit" onclick="login()">开始登录</button>
        <br>
        <a href="client.html" class="left">返回首页</a>
        <a href="register.html" class="right">注册账号</a>
      </form>
    </div>
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
    <script type="text/javascript" src="js/login.js"></script>
  </body>
</html>

3.2 login.js

function login(){
    $.ajax({
        type: "get",
        url: "/user/login",
        contentType: "application/json",
        dataType: "json",
        async: false,
        cache: false,// 使用同步操作
        timeout: 50000, //超时时间：50秒
        data: {
            "username": $("#username").val(),
            "password": $("#password").val()
        },
            
        success: function(result){
            if(result!=null&&result.status==200){
                alert("登陆成功！开始进行聊天吧")
                location.href="client.html"
            }else if(result!=null&&result.status==-12){
                alert("密码或账号为空")
            }else if(result!=null&&result.status==-14){
                alert("用户信息为空,请进行注册哦")
            }else if(result!=null&&result.status==-16){
                alert("账号或密码错误")
            }else{
                alert("出现内部错误，请联系管理员！")
            }
        },
        error: function () {
            alert("接口错误");       // 返回失败
        }

    });

    
}

3.3 login.css

body{
    background: url("../img/coolgirl.jpg");
    background-size:100% 100%;
    background-attachment: fixed;
}
h1{
    color: #FFF;
    text-align: center;
}
.container{
    margin: 100px auto;
    width: 30%;
}
form{
    background: #FFF;
    height: 300px;
    width: 100%;
    border-radius: 10px;
    position: relative;
}
label{
    color: #000;
    font-weight: bold;
    font-size: 20px;
    margin-left: 40px;
}
input{
    text-align: left;
    margin: 10px;
}
.input{
    width: 80%;
    height: 35px;
    margin-left: 40px;
}
.checkbox{
    margin-left: 30px;
}
a{
    text-decoration: none;
    font-weight: bold;
}
.submit{
    display: inline-block;
    margin-top: 0;
    margin-left:160px;
    background: black;
    border: none;
    color: #FFF;
    height: 35px;
    width: 100px;
    text-align: center;
    font-weight: bold;
    border-radius: 5px;
}
.submit:active {
    background-color: #666;
}
.left{
    margin: 20px;
}
.right{
    position: absolute;
    right: 20px;
}