使用JAVA API從FTP伺服器下載下傳檔案

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import sun.net.TelnetInputStream;

import sun.net.ftp.FtpClient;

public class FtpDownload extends HttpServlet {

 @Override

 protected void doGet(HttpServletRequest req, HttpServletResponse resp)

   throws ServletException, IOException {

   doPost(req, resp);

 }

 @Override

 protected void doPost(HttpServletRequest req, HttpServletResponse resp)

   throws ServletException, IOException {

  String ftpServer = "ftp server ip address";

  String username = "username";

  String password = "password";

  String filename = "filename";

  String path = "/path";

  FtpClient ftpClient = new FtpClient();

  ftpClient.openServer(ftpServer);

  ftpClient.login(username, password);

  if (path.length() != 0)

   ftpClient.cd(path);

  ftpClient.binary();

  TelnetInputStream is = ftpClient.get(filename);

  resp.setContentType("application/x-msdownload");

  resp.setHeader("Content-Disposition", (new StringBuilder(

    "attachment;filename=")).append(

    new String(filename.getBytes(), "ISO-8859-1")).toString());

  ServletOutputStream out = resp.getOutputStream();

  byte[] bytes = new byte[1048576];

  int c;

  while ((c = is.read(bytes)) != -1) {

   out.write(bytes, 0, c);

  }

  is.close();

  out.flush();

  out.close();

  ftpClient.closeServer();

 }

}