ftp服務器-Java上傳到fth時提示Connection closed without indication.

Java上傳到fth時提示Connection closed without indication.

如題，自己在系統中直接上傳的話是可以的，但用代碼上傳就不行了，代碼是這樣的
package cn.com.sensetech.ftp;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

public class Upload
{
/**

• Description: 向FTP服務器上傳文件
• @param url FTP服務器hostname
• @param port FTP服務器端口
• @param username FTP登錄賬號
• @param password FTP登錄密碼
• @param path FTP服務器保存目錄
• @param filename 上傳到FTP服務器上的文件名
• @param input 輸入流

• @return 成功返回true，否則返回false
  */
  public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {
  boolean success = false;
  FTPClient ftp = new FTPClient();
  try
  {
  int reply;
  ftp.connect(url, port);//連接FTP服務器
  //如果采用默認端口，可以使用ftp.connect(url)的方式直接連接FTP服務器
  ftp.login(username, password);//登錄
  reply = ftp.getReplyCode();
  if (!FTPReply.isPositiveCompletion(reply))
  {
  ftp.disconnect();
  return success;
  }
  ftp.changeWorkingDirectory(path);
  ftp.storeFile(filename, input);

  input.close();
  ftp.logout();
  success = true;
  }
  catch (IOException e)
  {
  e.printStackTrace();
  }
  finally
  {
  if (ftp.isConnected())
  {
  try
  {
  ftp.disconnect();
  }
  catch (Exception e)
  {
  e.printStackTrace();
  }
  }
  }
  return success;
  }

  public static void main(String[] args)
  {
  try
  {
  String filepath = "D:/upload/liuqian.txt";
  FileInputStream in = new FileInputStream(new File(filepath));
  boolean flag = uploadFile("localhost", 21, "lq", "123", "D:/upload", "walmartDemo", in);
  System.out.println(flag);
  }
  catch (Exception e)
  {
  e.printStackTrace();
  }
  }
  }

提示出錯信息
org.apache.commons.net.ftp.FTPConnectionClosedException: Connection closed without indication.
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:317)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
at org.apache.commons.net.ftp.FTP._connectAction_(FTP.java:400)
at org.apache.commons.net.ftp.FTPClient._connectAction_(FTPClient.java:924)
at org.apache.commons.net.SocketClient.connect(SocketClient.java:183)
at org.apache.commons.net.SocketClient.connect(SocketClient.java:203)
at cn.com.sensetech.ftp.Upload.uploadFile(Upload.java:30)
at cn.com.sensetech.ftp.Upload.main(Upload.java:105)
false

調試的時候發現錯誤出現在這裡
finally
{
if (ftp.isConnected())
{
try
{
ftp.disconnect();
}
catch (Exception e)
{
e.printStackTrace();
}
}

這究竟是怎麼回事啊，怎麼修改才能夠跑通，本人新手，求各位大師幫忙，感激不盡

最佳回答：

http://aspnetdb.iteye.com/blog/970408