Java 通过url响应图片

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@ApiOperation(value = "海报图片", httpMethod = "GET", response = Poster.class, notes = "query")     @RequestMapping(path = "/posterImage", method = RequestMethod.GET)     public void posterImage(@ApiParam("图片地址") @RequestParam String imgUrl, HttpServletResponse response) throws Exception {         log.info(">>>> Method:history>>posterImage request:{}", imgUrl);           try {             //new一个URL对象             URL url = new URL(imgUrl);             //打开链接             HttpURLConnection conn = (HttpURLConnection) url.openConnection();             //设置请求方式为"GET"             conn.setRequestMethod("GET");             //超时响应时间为5秒             conn.setConnectTimeout(5 * 1000);             //通过输入流获取图片数据             InputStream inStream = conn.getInputStream();             //得到图片的二进制数据，以二进制封装得到数据，具有通用性             BufferedImage img = ImageIO.read(inStream);             if (img != null) {                 String format = imgUrl.substring(imgUrl.lastIndexOf(".") + 1);                 ImageIO.write(img, format, response.getOutputStream());             }         } catch (IOException e) {             e.printStackTrace();         }       }