@Controller
@RequestMapping("imageCode")
public class ImageCodeController {Color getRandColor(int fc, int bc) {//给定范围获得随机颜色Random random = new Random();if (fc > 255)fc = 255;if (bc > 255)bc = 255;int r = fc + random.nextInt(bc - fc);int g = fc + random.nextInt(bc - fc);int b = fc + random.nextInt(bc - fc);return new Color(r, g, b);}@RequestMapping(value = "/showCode", method = RequestMethod.GET)public void outputImage(HttpServletRequest request, HttpServletResponse response, HttpSession session){//设置页面不缓存response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0);// 在内存中创建图象int width = 60, height = 20;BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics g = image.getGraphics();//生成随机类Random random = new Random();// 设定背景色g.setColor(getRandColor(200, 250));g.fillRect(0, 0, width, height);//设定字体g.setFont(new Font("Times New Roman", Font.PLAIN, 18));//画边框//g.setColor(new Color());//g.drawRect(0,0,width-1,height-1);// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到g.setColor(getRandColor(160, 200));for (int i = 0; i < 100; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);g.drawLine(x, y, x + xl, y + yl);}// 取随机产生的认证码(4位数字)String sRand = "";for (int i = 0; i < 4; i++) {String rand = String.valueOf(random.nextInt(10));sRand += rand;// 将认证码显示到图象中g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成g.drawString(rand, 13 * i + 6, 16);}// 将认证码存入SESSIONsession.setAttribute("code", sRand);// 图象生效g.dispose();// 输出图象到页面try {String formatName = "jpeg";ImageIO.write(image, /*"GIF"*/ formatName /* format desired */ , response.getOutputStream());} catch (IOException e) {e.printStackTrace();}}/*获取验证码*/@RequestMapping(value = "/getCode", method = RequestMethod.POST)public Result getRandCode(HttpSession session){Result result = new Result();Object obj= session.getAttribute("code");result.setObj(obj);return result ;}}

前端页面刷新，尾数带上时间即可点击刷新

这里的验证码是把他放在session，登陆时取出session，其实最好放数据库或redis之类的。

// 刷新验证码
function  refreshImg() {document.getElementById("imgCode").src = "${path}/imageCode/showCode?timestamp="+(new Date()).getTime();
}

@Controller
public class LoginController extends BaseController {/*** 登录** @param username 用户名* @param password 密码* @param txtCode* @param session* @return*/@RequestMapping(value = "/login", method = RequestMethod.POST)@ResponseBodypublic Result loginPost(String username, String password, String txtCode, HttpSession session) {Result result = new Result();// 比对验证码是否正确if ( !(txtCode.equals(session.getAttribute("code") ) ) ) {result.setMsg("验证码错误");return result;}Subject user = SecurityUtils.getSubject();UsernamePasswordToken token =new UsernamePasswordToken(username, password);token.setRememberMe(true);try {user.login(token);} catch (UnknownAccountException e) {result.setMsg("账号不存在");return result;} catch (DisabledAccountException e) {result.setMsg("账号未启用");return result;} catch (IncorrectCredentialsException e) {result.setMsg("密码错误");return result;} catch (RuntimeException e) {e.printStackTrace();result.setMsg("未知错误,请刷新界面重新登录！请联系管理员带上报错截图"+e.getMessage());
//            result.setMsg(e.getMessage());return result;}result.setSuccess(true);session.setAttribute("sex" , getUserSex());return result;}/*** 退出** @return*/@RequestMapping("/logout")
//    @ResponseBodypublic String logout() {ShiroUtils.logout();return "redirect:/" ;}
}

汉字验证码

package com.jude.controller;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.kafka.KafkaProperties;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;/*** 生成验证码* @author jude**/
@Controller
public class DrawImageController {public static final int WIDTH = 120;public static final int HEIGHT = 30;/*** 生成图片* @param request* @param response*/@RequestMapping("/drawImage")public void drawImage(HttpServletRequest request, HttpServletResponse response)throws Exception{request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");// 创建缓存BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,BufferedImage.TYPE_INT_RGB);// 获得画布Graphics g = bi.getGraphics();// 设置背影色setBackGround(g);// 设置边框setBorder(g);// 画干扰线drawRandomLine(g);// 写随机数String random = drawRandomNum((Graphics2D) g);// 将随机汉字存在session中request.getSession().setAttribute("checkcode", random);// 将图形写给浏览器response.setContentType("image/jpeg");// 发头控制浏览器不要缓存response.setDateHeader("expries", -1);response.setHeader("Cache-Control", "no-cache");response.setHeader("Pragma", "no-cache");// 将图片写给浏览器response.setHeader("Cache-Control", "no-store, no-cache");response.setContentType("image/jpeg");ImageIO.write(bi, "jpg", response.getOutputStream());}/*** 设置背景色* * @param g*/private void setBackGround(Graphics g) {// 设置颜色g.setColor(new Color(22, 160, 133));// 填充区域g.fillRect(0, 0, WIDTH, HEIGHT);}/*** 设置边框* * @param g*/private void setBorder(Graphics g) {// 设置边框颜色g.setColor(new Color(22, 160, 133));// 边框区域g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2);}/*** 画随机线条* * @param g*/private void drawRandomLine(Graphics g) {// 设置颜色g.setColor(Color.WHITE);// 设置线条个数并画线for (int i = 0; i < 5; i++) {int x1 = new Random().nextInt(WIDTH);int y1 = new Random().nextInt(HEIGHT);int x2 = new Random().nextInt(WIDTH);int y2 = new Random().nextInt(HEIGHT);g.drawLine(x1, y1, x2, y2);}}/*** 画随机汉字* * @param g* @return*/private String drawRandomNum(Graphics2D g) {StringBuffer sb = new StringBuffer();// 设置颜色g.setColor(Color.WHITE);// 设置字体g.setFont(new Font("宋体", Font.BOLD, 20));// 准备常用汉字集String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";int x = 5;// 控制字数for (int i = 0; i < 4; i++) {// 设置字体旋转角度int degree = new Random().nextInt() % 30;// 截取汉字String ch = base.charAt(new Random().nextInt(base.length())) + "";sb.append(ch);// 正向角度g.rotate(degree * Math.PI / 180, x, 20);g.drawString(ch, x, 20);// 反向角度g.rotate(-degree * Math.PI / 180, x, 20);x += 30;}System.out.println(sb.toString());return sb.toString();}}

//点击换一张验证码
function changeImg() {var imgSrc = $("#imgObj");   var src = imgSrc.attr("src");   imgSrc.attr("src",chgUrl(src));  $("#info").html("");
}
//时间戳
//为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳
function chgUrl(url) {var timestamp = (new Date()).valueOf();url = url.substring(0, 17);if ((url.indexOf("&") >= 0)) {url = url + "×tamp=" + timestamp;   } else {url = url + "?timestamp=" + timestamp;   }return url;
}
//验证码验证
function isRightCode() {var code = $("#veryCode").attr("value");//alert(code);code = "c=" + code;$.ajax( {type : "POST",url : "ResultServlet",data : code,success : callback});
}
//验证以后处理提交信息或错误信息
function callback(data) {if(data.toString()==1){$("#info").html("xw素材网提醒您：成功了！");return;}else{$("#info").html(data);return;}
}

页面

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>后台登录-进销存管理系统</title>
<meta name="author" content="DeathGhost" />
<link rel="stylesheet" type="text/css" href="static/css/style.css" />
<style>
body{height:100%;background: #16a085;overflow:hidden;}
canvas{z-index:-1;position:absolute;}
.black_overlay{  display: none;  position: absolute;  top: 0%;  left: 0%;  width: 100%;  height: 100%;  background-color: black;  z-index:1001;  -moz-opacity: 0.8;  opacity:.80;  filter: alpha(opacity=80);  }
.white_content {  display: none;  position: absolute;  top: 25%;  left: 35%;  width: 25%;  height: 15%;  padding: 16px;  border: solid black;  background-color: white;  z-index:1002;  overflow: auto;  }
</style>
<script src="static/js/jquery.js"></script>
<script src="static/js/verifyCode.js"></script>
<script src="static/js/Particleground.js"></script>
<script>$(document).ready(function() {//粒子背景特效$('body').particleground({dotColor: '#16a085',lineColor: '#5cbdaa'});$("#loginBtn").click(function(){$.post("/user/login",{userName:$("#userName").val(),password:$("#password").val(),imageCode:$("#imageCode").val()},function(result){if(result.success){if(result.roleSize==1){var roleId=result.roleList[0].id;$.post("/user/saveRole",{roleId:roleId},function(result){if(result.success){window.location.href="/main.html";  }});                                    }else{$("#roleList").empty();var roles=result.roleList;for(var i=0;i<roles.length;i++){if(i==0){$("#roleList").append("<input type='radio' checked=true  name='role' value='"+roles[i].id+"'/>"+roles[i].name+"&nbsp;&nbsp;")}else{$("#roleList").append("<input type='radio' name='role' value='"+roles[i].id+"'/>"+roles[i].name+"&nbsp;&nbsp;")}}document.getElementById('light').style.display='block';document.getElementById('fade').style.display='block';}}else{alert(result.errorInfo);}});});});function saveRole(){var roleId=$("input[name='role']:checked").val();$.post("/user/saveRole",{roleId:roleId},function(result){if(result.success){window.location.href="/main.html";    }});}</script>
</head>
<body>
<dl class="admin_login"><dt><strong>进销存管理系统</strong><em>Lnvoicing Management System</em></dt><dd class="user_icon"><input type="text" id="userName" placeholder="账号" class="login_txtbx"/></dd><dd class="pwd_icon"><input type="password" id="password" placeholder="密码" class="login_txtbx"/></dd><dd class="val_icon"><div class="checkcode"><input type="text" id="imageCode" name="imageCode" placeholder="验证码" maxlength="4" class="login_txtbx"><img id="imgObj" title="看不清，换一张" src="/drawImage" onclick="changeImg()" /></div></dd><dd><input type="button" id="loginBtn" value="立即登陆" class="submit_btn"/></dd><dd><p>© 2012-2018 </p><p><a href="" target="_blank"> </a></p></dd>
</dl><div id="light" class="white_content"> <p>请选择一个角色登录系统</p><br/><div id="roleList"></div><br/><input type="button" value="提交" onclick="saveRole()"/></div>
<div id="fade" class="black_overlay">
</div>
</body>
</html>

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