1.首先引入HuTool的依赖包
cn.hutool hutool-all 4.6.8
2.登录页面
3.LoginController.java 登录控制器
package com.wang.springboot.sys.controller;import cn.hutool.captcha.CaptchaUtil;import cn.hutool.captcha.LineCaptcha;import com.wang.springboot.sys.common.ActiveUser;import com.wang.springboot.sys.common.ResultObj;import com.wang.springboot.sys.common.WebUtils;import com.wang.springboot.sys.domain.User;import org.apache.shiro.SecurityUtils;import org.apache.shiro.authc.AuthenticationException;import org.apache.shiro.authc.AuthenticationToken;import org.apache.shiro.authc.UsernamePasswordToken;import org.apache.shiro.subject.Subject;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import javax.swing.*;import java.io.IOException;/** * @author 王一宁 * @since 2019-11-21 */@RestController@RequestMapping("/login")public class LoginController { @RequestMapping("/login") public ResultObj login(String loginname, String pwd, String code,HttpSession session){ //获得存储在session中的验证码 String sessionCheckCode = (String) session.getAttribute("code"); //判断验证码是否正确 if (code!=null && sessionCheckCode.equals(code)){ //登录成功,返回json的提示。 return ResultObj.LOGIN_SUCCESS; }else { //登陆失败,提示验证码不正确! return ResultObj.LOGIN_CHECKCODE_ERROR_PASS; } } /** * 得到登陆验证码 * @param response * @param session * @throws */ @RequestMapping("/getCode") public void getCode(HttpServletResponse response, HttpSession session) throws IOException { //HuTool定义图形验证码的长和宽,验证码的位数,干扰线的条数 LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(116, 36,4,10); //将验证码放入session session.setAttribute("code",lineCaptcha.getCode()); try { ServletOutputStream outputStream = response.getOutputStream(); lineCaptcha.write(outputStream); outputStream.close(); } catch (IOException e) { e.printStackTrace(); } }}