我的第一篇博客

 1  /**改变验证码*/
 2     @RequestMapping(value = "/changeImg",method = RequestMethod.GET)
 3     public void changeImg(HttpServletRequest request,HttpServletResponse response){
 4         response.setHeader("Pragma","No-cache");
 5         response.setHeader("Cache-Controller","no-cache");
 6         response.setDateHeader("Expires",0);
 7 
 8         response.setContentType("image/jpeg");
 9         System.out.println("123456");
10 
11         //生成随机字符串
12         String verifyCode = VerifyCodeUtils.generateVerifyCode(4);
13         //存入会话的session
14         HttpSession session = request.getSession(true);
15         session.setAttribute("rand",verifyCode.toLowerCase());
16         //生成图片
17         int w = 100,h=40;
18         try {
19             VerifyCodeUtils.outputImage(w,h,response.getOutputStream(),verifyCode);
20         } catch (IOException e) {
21             e.printStackTrace();
22         }
23 
24     }