1. 导入第三方包，主要用来生成图形验证码
<dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>4.6.8</version> </dependency>2. 获取生成的图形验证码图片流，验证图片验证码
package com.JXWorkApi.controller; import cn.hutool.captcha.CaptchaUtil; import cn.hutool.captcha.ShearCaptcha; import com.JXWork.result.Result; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.OutputStream; /** * 图形验证码生成 * * 使用HuTool的captcha在内存中生成的验证码图片，并将绘制在图片上的验证码存放到session中用于后续验证 最后通过OutputStream将生成的图片进行输出 将页面提交的验证码和存放在session中的验证码对比来进行校验 * * @author TF12778 2019/10/6 15:46 */ @Controller @RequestMapping(value = "/captcha") public class HuToolController { private static Log logger = LogFactory.getLog(HuToolController.class); /** * 获取图形验证码 * http://localhost:9999/JXWorkApi/captcha/getShearCaptcha * @param request * @param response * @return */ @ResponseBody @RequestMapping(value = "/getShearCaptcha", method = RequestMethod.GET) public Result<String> getShearCaptcha(HttpServletRequest request, HttpServletResponse response) { OutputStream out = null; try { out = response.getOutputStream();// 取得输出流 //定义图形验证码的长、宽、验证码字符数、干扰线宽度 ShearCaptcha captcha = CaptchaUtil.createShearCaptcha(200, 100, 4, 4); //ShearCaptcha captcha = new ShearCaptcha(200, 100, 4, 4); //图形验证码写出，可以写出到文件，也可以写出到流 // captcha.write("/Users/sunww/Desktop/shear.png"); captcha.write(out); //验证图形验证码的有效性，返回boolean值 boolean checkPass = captcha.verify(captcha.getCode()); logger.info(checkPass); // 将生成的验证码code放入sessoin中 request.getSession().setAttribute("code", captcha.getCode()); out.flush(); // 将缓存中的数据立即强制刷新, 将缓冲区的数据输出到客户端浏览器 out.close(); // 关闭输出流 return null; } catch (IOException e) { e.printStackTrace(); } finally { if (out != null) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } return new Result<String>("error", "图片获取失败", "", null, "500" ); } /** * 验证图形码（这一步其实可以放到登录拦截器中去做） * http://localhost:9999/JXWorkApi/captcha/verifyCode?code=e2xr * @param inCode 前端输入的图形验证码code * @param req * @return */ @ResponseBody @RequestMapping(value = "/verifyCode", method = RequestMethod.GET) public Result<String> verifyCode(String inCode, HttpServletRequest req) { // 获取存放在session中的验证码 String code = (String) req.getSession().getAttribute("code"); // 获取页面提交的验证码 // String inputCode = req.getParameter("code"); String inputCode = inCode; if(code.toLowerCase().equals(inputCode.toLowerCase())) { // 验证码不区分大小写 return new Result<String>("success", "验证成功", "", null, "200" ); } return new Result<String>("error", "验证失败", "", null, "500" ); } }3. 测试结果：
获取的图片如下所示：
图形验证码验证：
