项目代码：https://github.com/bruceq/supermarket

项目结构：

依赖关系：

common:公共层，无依赖

dao:数据层，依赖common

service：服务层，依赖dao、common

web：应用层，依赖dao、common、service

注：启动类在web层中

父依赖pom

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://.loan.supermarket.mapper.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.servlet.ModelAndView;import org.thymeleaf.util.StringUtils; import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.awt.image.BufferedImage;import java.io.ByteArrayOutputStream;import java.util.ArrayList;import java.util.Date; @Controllerpublic class TemplateController { @RequestMapping("/index") public String index(Model model) { User user = new User(); user.setName("张三"); user.setId(1L); user.setTelephone("123456789"); user.setPassword("@#$%^&*()"); user.setRegisterTime(new Date()); user.setPopedom(1); User user1 = new User(); user1.setName("李四"); user1.setId(2L); user1.setTelephone("2222222"); user1.setPassword("最近是南风天"); user1.setRegisterTime(new Date()); user1.setPopedom(1); User user2 = new User(); user2.setName("王五"); user2.setId(3L); user2.setTelephone("33333333333"); user2.setPassword("妖姬"); user2.setRegisterTime(new Date()); user2.setPopedom(1); User user3 = new User(); user3.setName("赵六"); user3.setId(4L); user3.setTelephone("33333333333"); user3.setPassword("过河卒"); user3.setRegisterTime(new Date()); user3.setPopedom(0); ArrayList<User> list = new ArrayList<User>(); list.add(user); list.add(user1); list.add(user2); list.add(user3); model.addAttribute("users", list); return "index"; } @RequestMapping("/login") public String login1() { return "login"; } @PostMapping("/user_login") @ResponseBody public JsonObject<String> login(String username, String password, HttpServletRequest request) { JsonObject<String> obj = new JsonObject<String>(); HttpSession session = request.getSession(); if (!StringUtils.isEmpty(username) && !StringUtils.isEmpty(password)) { obj.setCode("0"); User user = new User(); user.setName(username); session.setAttribute("loginUser", user); return obj; } obj.setCode("1"); obj.setMessage("用户名或密码错误"); return obj; } @Autowired private DefaultKaptcha captchaProducer; /** * 获取验证码 的 请求路径 * @param httpServletRequest * @param httpServletResponse * @throws Exception */ @RequestMapping("/defaultKaptcha") public void defaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception{ byte[] captchaChallengeAsJpeg = null; ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream(); try { //生产验证码字符串并保存到session中 String createText = captchaProducer.createText(); httpServletRequest.getSession().setAttribute("vrifyCode", createText); //使用生产的验证码字符串返回一个BufferedImage对象并转为byte写入到byte数组中 BufferedImage challenge = captchaProducer.createImage(createText); ImageIO.write(challenge, "jpg", jpegOutputStream); } catch (IllegalArgumentException e) { httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND); return; } //定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组 captchaChallengeAsJpeg = jpegOutputStream.toByteArray(); httpServletResponse.setHeader("Cache-Control", "no-store"); httpServletResponse.setHeader("Pragma", "no-cache"); httpServletResponse.setDateHeader("Expires", 0); httpServletResponse.setContentType("image/jpeg"); ServletOutputStream responseOutputStream = httpServletResponse.getOutputStream(); responseOutputStream.write(captchaChallengeAsJpeg); responseOutputStream.flush(); responseOutputStream.close(); } /** * 验证的方法 * @param httpServletRequest * @param httpServletResponse * @return */ @RequestMapping("/imgvrifyControllerDefaultKaptcha") public ModelAndView imgvrifyControllerDefaultKaptcha(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){ ModelAndView andView = new ModelAndView(); String captchaId = (String) httpServletRequest.getSession().getAttribute("vrifyCode"); String parameter = httpServletRequest.getParameter("vrifyCode"); System.out.println("Session vrifyCode "+captchaId+" form vrifyCode "+parameter); if (!captchaId.equals(parameter)) { andView.addObject("info", "错误的验证码"); andView.setViewName("index"); } else { andView.addObject("info", "登录成功"); andView.setViewName("success"); } return andView; }}

搭配前台的代码一起分析：

<!DOCTYPE html><html xmlns:th="http://www.thymeleaf.org"><head> <title>显示学生信息</title> <meta charset="UTF-8"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <link th:href="@{/bootstrap/bootstrap.css}" href="../static/bootstrap/bootstrap.css" rel="stylesheet"/> <link th:href="@{/bootstrap/bootstrap-theme.css}" href="../static/bootstrap/bootstrap-theme.css" rel="stylesheet"/> <script th:src="@{/js/jquery.min.js}" src="../static/js/jquery.min.js"></script> <script th:src="@{/js/bootstrap.min.js}" src="../static/js/bootstrap.min.js"></script> <script type="text/javascript"> $(function () { $("#submit").click(function () { $.post("/user_login", $("#loginForm").serialize(), function (data) { if (data.code == "0") { window.location.href = "/index"; } else if (data.code == "1") { $("#tick").text(data.message).css("color", "red"); } }) }); }); </script></head><body><div class="container"> <div class="row"> <form class="form-horizontal" id="loginForm"> <div class="col-md-4"> <div class="panel panel-primary"> <div class="panel-heading text-center"> <span class="panel-title">学生信息</span> </div> <div class="form-group"> <label for="username" class="col-sm-3 control-label" style="color: red">账&nbsp;号:</label> <div class="col-sm-8"> <input type="text" class="form-control" id="username" name="username" placeholder="请输入账号"> </div> </div> <div class="form-group"> <label for="password" class="col-sm-3 control-label" style="color: red">密&nbsp;码:</label> <div class="col-sm-8"> <input type="password" class="form-control" id="password" name="password" placeholder="请输入密码"> </div> </div> <div class="form-group"> <label class="col-sm-10 control-label" style="color:red;text-align: center" id="tick">&nbsp;</label> </div> <div class="form-group"> <form action="imgvrifyControllerDefaultKaptcha"> <div class="col-sm-8"> <input type="text" name="vrifyCode" class="form-control"/> </div> <img alt="验证码" onclick="this.src='defaultKaptcha?d='+new Date()*1" src="defaultKaptcha"> </br> </form> </div> <div class="form-group"> <div class="col-sm-8"> <button type="button" id="submit" class="btn btn-default">登录</button> </div> </div> <div class="panel-footer text-right"> <span class="panel-title">大侠工作室@2108</span> </div> </div> </div> </form> </div></div></body></html>

在项目启动后，访问http://localhost:8000/login，进入到登录页面，首先加载必要的css和js资源，在填写好用户名、密码后，点击登录，会执行user_login的接口方法， 简单的对用户进行校验，即可进入首页。

其次要说的是这个项目中，添加了验证码的功能，使用了kaptcha的依赖。在登录界面中，增加了验证码的显示，点击验证码图片后，可以切换验证码。

登录界面

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