下载服务器上的文件—通过url

String fileHome = this.getServlet().getServletContext().getRealPath("/");

  InputStream is;

  FileOutputStream fileOut = new FileOutputStream(fileHome + "upload/receive/" + md.getId()+1 + ".zip");

  URL url = new URL(md.getFromIp().replace("receive/onlineExport.do", "upload/receive/" + md.getId() + ".zip"));

  URLConnection c = url.openConnection(); // *

  c.connect();

  is = c.getInputStream();

  int data;

  while ((data = is.read()) != -1) {

   fileOut.write(data);

  }

  is.close();

  fileOut.close();