controller转发请求获取图片流

@Slf4j
@RestController
@RequestMapping("/kexin")
public class KexinController {
     

    /**
     * 获取图片
     */
    @RequestMapping("/storage/image")
    public Object getImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
     
        
        String url = "http://10.128.129.240:11250/1041,01378934ba9c19f0";
        byte[] bytes = ImageUtils.getBytesByUrlWithSession(url,"sessionId");
        response.getOutputStream().write(bytes);
        //返回null即可
        return null;
    }
	/**
	 *获取图片二进制数组
	 */
	 private  byte[] getBytesByUrlWithSession(String imgUrl,String sessionId) throws Exception {
     

        if (StringUtils.isEmpty(imgUrl)) {
     
            return null;
        }
        BufferedInputStream bis = null;
        ByteArrayOutputStream bos = null;
        HttpURLConnection http;
        URL url;

        try {
     
            url = new URL(imgUrl);
            http = (HttpURLConnection) url.openConnection();
            if(!StringUtils.isEmpty(sessionId)){
     
                http.setRequestProperty("session_id",sessionId);
            }
            http.setConnectTimeout(3000);
            http.connect();
            bis = new BufferedInputStream(http.getInputStream());
            bos = new ByteArrayOutputStream();
            byte[] buf = new byte[BUF_SIZE];
            int size;
            while ((size = bis.read(buf)) != -1) {
     
                bos.write(buf, 0, size);
            }
            http.disconnect();
            return bos.toByteArray();
        } finally {
     
            if (bis != null) {
     
                try {
     
                    bis.close();
                } catch (IOException e) {
     
                    log.error("流关闭失败，原因：" + e.getMessage(), e);
                }
            }
            if (bos != null) {
     
                try {
     
                    bos.close();
                } catch (IOException e) {
     
                    log.error("流关闭失败，原因：" + e.getMessage(), e);
                }
            }
        }
    }

}