一：用到了hutool工具類中的驗證碼生成類，黃色標注為重點
1.引用maven
<!--hutool工具類-->
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.4.1</version>
</dependency>
2.前端html頁面
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>后台管理-登陸</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta http-equiv="Access-Control-Allow-Origin" content="*">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="format-detection" content="telephone=no">
<link rel="stylesheet" th:href="@{/lib/layui-v2.6.3/css/layui.css}" media="all">
<script th:src="@{/lib/jquery-3.4.1/jquery-3.4.1.min.js}" charset="utf-8"></script>
<script th:src="@{/lib/layui-v2.6.3/layui.js}" charset="utf-8"></script>
<script th:src="@{/lib/jq-module/jquery.particleground.min.js}" charset="utf-8"></script>
<!--[if lt IE 9]>
<script src="https://cdn.staticfile.org/html5shiv/r29/html5.min.js"></script>
<script src="https://cdn.staticfile.org/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
<style>
html, body {width: 100%;height: 100%;overflow: hidden}
body {background: #1E9FFF;}
body:after {content:'';background-repeat:no-repeat;background-size:cover;-webkit-filter:blur(3px);-moz-filter:blur(3px);-o-filter:blur(3px);-ms-filter:blur(3px);filter:blur(3px);position:absolute;top:0;left:0;right:0;bottom:0;z-index:-1;}
.layui-container {width: 100%;height: 100%;overflow: hidden}
.admin-login-background {width:360px;height:300px;position:absolute;left:50%;top:40%;margin-left:-180px;margin-top:-100px;}
.logo-title {text-align:center;letter-spacing:2px;padding:14px 0;}
.logo-title h1 {color:#1E9FFF;font-size:25px;font-weight:bold;}
.login-form {background-color:#fff;border:1px solid #fff;border-radius:3px;padding:14px 20px;box-shadow:0 0 8px #eeeeee;}
.login-form .layui-form-item {position:relative;}
.login-form .layui-form-item label {position:absolute;left:1px;top:1px;width:38px;line-height:36px;text-align:center;color:#d2d2d2;}
.login-form .layui-form-item input {padding-left:36px;}
.captcha {width:60%;display:inline-block;}
.captcha-img {display:inline-block;width:34%;float:right;}
.captcha-img img {height:34px;border:1px solid #e6e6e6;height:36px;width:100%;}
</style>
</head>
<body>
<div class="layui-container">
<div class="admin-login-background">
<div class="layui-form login-form">
<form class="layui-form" action="javaScript:;" >
<!--<form class="layui-form" action="javaScript:;" onsubmit="return checkForm()">-->
<div class="layui-form-item logo-title">
<h1>我佛慈悲后台登錄</h1>
</div>
<div class="layui-form-item">
<label class="layui-icon layui-icon-username" for="username"></label>
<input type="text" id="username" name="username" lay-verify="required|account" placeholder="賬號" autocomplete="off" class="layui-input" value="">
</div>
<div class="layui-form-item">
<label class="layui-icon layui-icon-password" for="password"></label>
<input type="password" id="password" name="password" lay-verify="required|password" placeholder="密碼" autocomplete="off" class="layui-input" value="">
</div>
<div class="layui-form-item">
<label class="layui-icon layui-icon-vercode" ></label>
<!--<input type="text" name="captcha" lay-verify="required|captcha" placeholder="圖形驗證碼" autocomplete="off" class="layui-input verification captcha" value="xszg">-->
<input type="text" id="imgText" name="imgText" placeholder="圖形驗證碼" autocomplete="off" class="layui-input verification captcha" >
<div class="captcha-img">
<!--<img id="captchaPic" th:src="@{/images/captcha.jpg}" >-->
<img id="codeImg" th:src="@{/getCode}" onclick="refresh()" alt="" >
</div>
</div>
<div class="layui-form-item">
<font id="error" name="error" color="red"></font>
</div>
<div class="layui-form-item">
<input type="checkbox" name="rememberMe" value="true" lay-skin="primary" title="記住密碼">
</div>
<div class="layui-form-item">
<button class="layui-btn layui-btn layui-btn-normal layui-btn-fluid" lay-submit="" lay-filter="login">登 入</button>
</div>
</form>
</div>
</div>
</div>
<script> function refresh() { console.log(1) // $('#codeImg').src="getCode?time="+new Date().getTime();
document.getElementById("codeImg").src="getCode?time="+new Date().getTime(); } </script>
<script>
layui.use(['form'], function () {
var form = layui.form,
layer = layui.layer
// $ = layui.$;
// 登錄過期的時候，跳出ifram框架
if (top.location != self.location) top.location = self.location;
// 粒子線條背景
$(document).ready(function(){
$('.layui-container').particleground({
dotColor:'#7ec7fd',
lineColor:'#7ec7fd'
});
});
// 進行登錄操作
form.on('submit(login)', function (data) {
data = data.field;
if (data.username == '') {
layer.msg('用戶名不能為空');
return false;
}
if (data.password == '') {
layer.msg('密碼不能為空');
return false;
}
if (data.imgText == '') {
layer.msg('驗證碼不能為空');
return false;
}
$.ajax({
// url: "http://localhost:8081/login",
url: "/login",
data: {
username: data.username,
password: data.password,
imgText: data.imgText
},
dataType: "json",
type: "post",
success: function(data) {
if (data.code == "1000") {
console.log(data.msg)
window.location.href="/toIndex";
} else {
alert(data.msg);
// data.error.innerText = data.msg
$("#error").text(data.msg);
}
}
});
});
});
</script>
</body>
</html>
3.后端java代碼
package com.jack.all.controller; import cn.hutool.captcha.CaptchaUtil; import cn.hutool.captcha.LineCaptcha; import cn.hutool.captcha.generator.RandomGenerator; import com.jack.all.common.AjaxReturn; import com.jack.all.entity.TUser; import com.jack.all.service.TUserService; import org.apache.commons.lang3.ObjectUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; @Controller public class LoginController { @Autowired private TUserService userService; private LineCaptcha lineCaptcha;//獲取驗證碼用到的code /** *進入到登錄界面 * @return */ @RequestMapping("/toLogin") public String toLogin(){ return "login-1"; } /** * 登錄驗證 * @param request * @param session * @return */ @RequestMapping("/login") @ResponseBody public AjaxReturn login(HttpServletRequest request, HttpSession session){ String number=request.getParameter("username"); String password=request.getParameter("password"); String imgText=request.getParameter("imgText"); System.out.println("======"+imgText); TUser check = userService.check(number, password); if (ObjectUtils.isEmpty(check)){ return new AjaxReturn("1001","賬號不存在"); }else { if (!check.getNumber().equals(number)){ return new AjaxReturn("1001","賬號錯誤"); }else { if (!check.getPassword().equals(password)){ return new AjaxReturn("1001","密碼錯誤"); }else if (!imgText.equals(lineCaptcha.getCode())){ return new AjaxReturn("1001","驗證碼錯誤"); } } } session.setAttribute("login_user",check); return new AjaxReturn("1000","賬號和密碼正確",check); } /** * 生成驗證碼 * @param response */ @RequestMapping("/getCode") public void getCode(HttpServletResponse response){ //隨機生成4為驗證碼 RandomGenerator randomGenerator=new RandomGenerator("0123456789",4); //定義圖片的顯示大小 lineCaptcha=CaptchaUtil.createLineCaptcha(100,30); response.setContentType("image/jpeg"); response.setHeader("Pragma","No-cache"); try { //調用父類的setGenerator()方法，設置驗證碼的類型 lineCaptcha.setGenerator(randomGenerator); //輸出到頁面 lineCaptcha.write(response.getOutputStream()); System.out.println(lineCaptcha.getCode()); //關閉流 response.getOutputStream().close(); }catch (Exception e){ e.printStackTrace(); } } }