SSM框架文件远程服务器下载

@RequestMapping("/fileDownLoad")
    public HttpServletResponse fileDownLoad(@RequestParam("name") String name, HttpServletRequest request , HttpServletResponse response) throws Exception {
        String fileName = name;
        //连接远程服务器
//        org.apache.commons.io.FileUtils.copyURLToFile(new URL("http://192.168.3.45/do-upload/component-factory/js/watch.1.3.1.js"), new File("watch.1.3.1.js"));
        String realPath = "http://localhost:8081/lvresourcems/uploadfiles/" + fileName;
        URL url = new URL(realPath);
        HttpURLConnection urlconn = (HttpURLConnection) url.openConnection();
        urlconn.connect();
        BufferedInputStream bis = null;
        ServletOutputStream os = null;
        bis = new BufferedInputStream(urlconn.getInputStream());
        os = response.getOutputStream();
        //InputStream in=urlconn.getInputStream();//将该文件加入到输入流之中
        byte b[] = new byte[2048];
        //客户使用保存文件的对话框：
        response.setHeader("Content-disposition", "inline;filename=" + fileName);
        //通知客户文件的MIME类型：
        response.setContentType("application/octet-stream exe;charset=gb2312");

        int size;
        //读取文件内容到缓存;
        while ((size = bis.read(b, 0, b.length)) != -1) {   //把文件内容写到本地文件中;
            //bos.write(b,0,size);
            os.write(b, 0, size);
        }
        os.close();
        bis.close();


//        fileName=new String(fileName.getBytes("gbk"),"iso8859-1");//防止中文乱码
//        HttpHeaders headers=new HttpHeaders();//设置响应头
//        headers.add("Content-Disposition", "attachment;filename="+fileName);
//        HttpStatus statusCode = HttpStatus.OK;//设置响应吗
//        ResponseEntity<byte[]> response=new ResponseEntity<byte[]>(body, headers, statusCode);
        return response;
        //public ResponseEntity（T  body，
        //                       MultiValueMap < String，String > headers，
        //                       HttpStatus  statusCode）
        //HttpEntity使用给定的正文，标题和状态代码创建一个新的。
        //参数：
        //body - 实体机构
        //headers - 实体头
        //statusCode - 状态码

        }