微信图片不可显示java解决方法

先看知乎:https://www.zhihu.com/question/35044484

场景: 微信上传了图片素材，返回了图片url，然后不能在img标签中正常显示.

原因是微信做了图片防盗连接.

解决方法:

原理：使用你的服务端脚本，远程抓取图片，然后输出image/* 格式，就可以了。

java方法:

     @RequestMapping("/img")
     @ResponseBody
     public void aa1(@NotNull String url, HttpServletRequest request, HttpServletResponse response) throws IOException {

         if (!StringUtil.isEmpty(url)) {
             int index=url.indexOf("http");
             if(index==-1){
                 url="http://"+url;
             }
             URL getUrl = new URL(url);
             URLConnection connection = getUrl.openConnection();
             connection.setRequestProperty("Referer", "");
             connection.setRequestProperty("accept", "*/*");
             connection.setRequestProperty("connection", "Keep-Alive");
             connection.setRequestProperty("user-agent",
                     "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36");
             connection.setDoOutput(true);
             InputStream fis = connection.getInputStream();
             OutputStream os = response.getOutputStream();
             int count = 0;
             byte[] buffer = new byte[1024 * 1024];
             while ((count = fis.read(buffer)) != -1) {
                 os.write(buffer, 0, count);
             }
             os.flush();
             fis.close();
             response.setContentType("image/*");
         }
     }

url是微信的图片连接.