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.