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下载远程文件

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

  

/** * 下载飞行资料夹 * * @param fileName * @param response * @return */ @RequestMapping(value = "/download", method = {RequestMethod.POST, RequestMethod.GET}) @ResponseBody public Object onDownload(String fileName, HttpServletResponse response) { ResponseJson json = new ResponseJson(); HttpURLConnection con = null; InputStream is = null; try { URL url = new URL(ServiceConstants.DOWNLOAD_URL_FLIGHT + fileName); // 远程文件url,如:http://211.64.201.201/uploadfile/nyz.mp3 con = (HttpURLConnection) url.openConnection(); response.setContentType("multipart/form-data"); // 自动识别下载文件格式 response.setHeader("Content-Disposition", "attachment;fileName=" + fileName.substring(8, fileName.length())); // 文件名 response.setHeader("Content-Length", con.getHeaderField("Content-Length")); // 文件大小 is = con.getInputStream(); byte[] b = new byte[1024]; int len = 0; while ((len = is.read(b)) != -1) { response.getOutputStream().write(b, 0, len); // 仅写入读取到的字符,区别于write(b) } response.getOutputStream().flush(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (con != null) { con.disconnect(); } if (is != null) { is.close(); } if (response.getOutputStream() != null) { response.getOutputStream().close(); } } catch (IOException e) { e.printStackTrace(); } } json.setSuccess(true); return json; }