content: package com.ruoyi.web.controller.system;
  
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import javax.annotation.Resource;
  import javax.imageio.ImageIO;
  import javax.servlet.ServletOutputStream;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpSession;
  import org.springframework.stereotype.Controller;
  import org.springframework.web.bind.annotation.GetMapping;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.servlet.ModelAndView;
  import com.google.code.kaptcha.Constants;
  import com.google.code.kaptcha.Producer;
  import com.ruoyi.framework.web.base.BaseController;
  
  /**
   * 图片验证码（支持算术形式）
   * 
   * @author ruoyi
   */
  @Controller
  @RequestMapping("/captcha")
  public class SysCaptchaController extends BaseController
  {
      @Resource(name = "captchaProducer")
      private Producer captchaProducer;
  
      @Resource(name = "captchaProducerMath")
      private Producer captchaProducerMath;
  
      /**
       * 验证码生成
       */
      @GetMapping(value = "/captchaImage")
      public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response)
      {
          ServletOutputStream out = null;
          try
          {
              HttpSession session = request.getSession();
              response.setDateHeader("Expires", 0);
              response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
              response.addHeader("Cache-Control", "post-check=0, pre-check=0");
              response.setHeader("Pragma", "no-cache");
              response.setContentType("image/jpeg");
  
              String type = request.getParameter("type");
              String capStr = null;
              String code = null;
              BufferedImage bi = null;
              if ("math".equals(type))
              {
                  String capText = captchaProducerMath.createText();
                  capStr = capText.substring(0, capText.lastIndexOf("@"));
                  code = capText.substring(capText.lastIndexOf("@") + 1);
                  bi = captchaProducerMath.createImage(capStr);
              }
              else if ("char".equals(type))
              {
                  capStr = code = captchaProducer.createText();
                  bi = captchaProducer.createImage(capStr);
              }
              session.setAttribute(Constants.KAPTCHA_SESSION_KEY, code);
              out = response.getOutputStream();
              ImageIO.write(bi, "jpg", out);
              out.flush();
  
          }
          catch (Exception e)
          {
              e.printStackTrace();
          }
          finally
          {
              try
              {
                  if (out != null)
                  {
                      out.close();
                  }
              }
              catch (IOException e)
              {
                  e.printStackTrace();
              }
          }
          return null;
      }
  }