页面：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登入 - 爱清净</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=0">
<link rel="stylesheet" href="/layuiadmin/layui/css/layui.css" media="all">
<link rel="stylesheet" href="/layuiadmin/style/admin.css" media="all">
<link rel="stylesheet" href="/layuiadmin/style/login.css" media="all">
<style>
#canvas {
float: right;
display: inline-block;
border: none;
border-radius: 5px;
cursor: pointer;
}
</style>
</head>
<body>
<div class="layadmin-user-login layadmin-user-display-show" id="LAY-user-login" style="display: none;">
<div class="layadmin-user-login-main">
<div class="layadmin-user-login-box layadmin-user-login-header">
<h2>爱清净</h2>
<p>爱清净 后台管理系统</p>
</div>
<div class="layadmin-user-login-box layadmin-user-login-body layui-form">
<div class="layui-form-item">
<label class="layadmin-user-login-icon layui-icon layui-icon-username" for="LAY-user-login-username"></label>
<input type="text" name="loginName" id="loginName" lay-verify="required" placeholder="用户名" class="layui-input">
</div>
<div class="layui-form-item">
<label class="layadmin-user-login-icon layui-icon layui-icon-password" for="LAY-user-login-password"></label>
<input type="password" name="passWord" id="passWord" lay-verify="required" placeholder="密码" class="layui-input">
</div>
<div class="layui-form-item">
<div class="layui-row">
<div class="layui-col-xs7">
<label class="layadmin-user-login-icon layui-icon layui-icon-vercode" for="LAY-user-login-vercode"></label>
<input type="text" name="vercode" id="vercode" lay-verify="required" placeholder="图形验证码" class="layui-input">
</div>
<div class="layui-col-xs5">
<div style="margin-left: 10px;">
<canvas id="canvas" width="129.53" height="38"></canvas>
</div>
</div>
</div>
</div>
<div class="layui-form-item">
<button id="btn" class="layui-btn layui-btn-fluid" lay-submit lay-filter="login">登 入</button>
</div>
</div>
</div>
</div>
<script src="/lib/jquery/jquery.min.js"></script>
<script src="/layuiadmin/layui/layui.js"></script>
<script src="/js/admin/login.js"></script>
</body>
</html>js：
var show_num = []; //存储随机验证码
$(function(){
//生成随机验证码
draw(show_num);
$("#canvas").on('click',function(){
draw(show_num);
});
});
//获得随机验证码
function draw(show_num) {
var canvas_width=$('#canvas').width();
var canvas_height=$('#canvas').height();
var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
canvas.width = canvas_width;
canvas.height = canvas_height;
var sCode = "A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
var aCode = sCode.split(",");
var aLength = aCode.length;//获取到数组的长度
for (var i = 0; i <= 3; i++) {
var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
var txt = aCode[j];//得到随机的一个内容
show_num[i] = txt.toLowerCase();
var x = 10 + i * 20;//文字在canvas上的x坐标
var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
context.font = "bold 23px 微软雅黑";
context.translate(x, y);
context.rotate(deg);
context.fillStyle = randomColor();
context.fillText(txt, 0, 0);
context.rotate(-deg);
context.translate(-x, -y);
}
for (var i = 0; i <= 5; i++) { //验证码上显示线条
context.strokeStyle = randomColor();
context.beginPath();
context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
context.stroke();
}
for (var i = 0; i <= 30; i++) { //验证码上显示小点
context.strokeStyle = randomColor();
context.beginPath();
var x = Math.random() * canvas_width;
var y = Math.random() * canvas_height;
context.moveTo(x, y);
context.lineTo(x + 1, y + 1);
context.stroke();
}
}
//得到随机的颜色值
function randomColor() {
var r = Math.floor(Math.random() * 256);
var g = Math.floor(Math.random() * 256);
var b = Math.floor(Math.random() * 256);
return "rgb(" + r + "," + g + "," + b + ")";
}
layui.config({
base: '/layuiadmin/' //静态资源所在路径
}).extend({
index: 'lib/index' //主入口模块
}).use(['index', 'user'], function(){
var $ = layui.$
,setter = layui.setter
,admin = layui.admin
,form = layui.form
,router = layui.router()
,search = router.search;
form.render();
//提交
form.on('submit(login)', function(obj){
//校验随机验证码
var val = $("#vercode").val().toLowerCase();
// var val = $(".vercode").val().toLowerCase();
var num = show_num.join("");
console.log("val:"+val);
console.log("num:"+num);
if(val != num){
layer.msg('验证码错误', {
offset: '15px'
,icon: 2
,time: 1000
}, function(){
$("#vercode").val('');
draw(show_num);
return;
});
}else{
$("#vercode").val('');
draw(show_num);
$.ajax({
url:'/admin/login.dd',
type: 'post',
data: obj.field,
success:function (result) {
if(result.state==false){
var message=result.message;
layer.msg(message, {
offset: '15px'
,icon: 2
,time: 1000
}, function(){
return;
});
}else{
layer.msg('登入成功', {
offset: '15px'
,icon: 1
,time: 1000
}, function(){
location.href="/admin/index"; //后台主页
});
}
}
})
}
});
});controller：
/**
* 验证登陆
* @return
*/
@PostMapping("login.dd")
@ResponseBody
public AjaxResult login(HttpServletRequest request){
AjaxResult ajaxResult=new AjaxResult();
ajaxResult.setState(true);
String loginName=request.getParameter("loginName");
String passWord=request.getParameter("passWord");
//密码加密
passWord=encodePassword(passWord);
Example example=new Example(UserEntity.class);
Example.Criteria criteria = example.createCriteria();
criteria.andEqualTo("loginName",loginName);
criteria.andEqualTo("delFlag","0");
List<UserEntity> back = userService.findList(example,null);
if(back==null||back.size()<=0){
ajaxResult.setState(false);
ajaxResult.setMessage("账号或密码错误");
}else if(!passWord.equals(back.get(0).getPassWord())){
ajaxResult.setState(false);
ajaxResult.setMessage("账号或密码错误");
}else{
System.out.println("登录成功");
}
return ajaxResult;
}