SpringBoot实现验证码功能

package com.example.demo.controller; import cn.hutool.captcha.CaptchaUtil; import cn.hutool.captcha.CircleCaptcha; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.io.IOException; @RestController @RequestMapping("getcode") public class GetcodeController { @Autowired HttpServletResponse response; @Autowired HttpSession session; @GetMapping("code") void getCode() throws IOException { // 利用 hutool 工具，生成验证码图片资源 CircleCaptcha captcha = CaptchaUtil.createCircleCaptcha(200, 100, 4, 5); // 获得生成的验证码字符 String code = captcha.getCode(); // 利用 session 来存储验证码 session.setAttribute("code",code); // 将验证码图片的二进制数据写入【响应体 response 】 captcha.write(response.getOutputStream()); } }