Java上传到fth时提示Connection closed without indication.

Question

如题，自己在系统中直接上传的话是可以的，但用代码上传就不行了，代码是这样的
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服务器上传文件
• @param url FTP服务器hostname
• @param port FTP服务器端口
• @param username FTP登录账号
• @param password FTP登录密码
• @param path FTP服务器保存目录
• @param filename 上传到FTP服务器上的文件名
• @param input 输入流

• @return 成功返回true，否则返回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);//连接FTP服务器
  //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
  ftp.login(username, password);//登录
  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();
  }
  }
  }

提示出错信息
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

调试的时候发现错误出现在这里
finally
{
if (ftp.isConnected())
{
try
{
ftp.disconnect();
}
catch (Exception e)
{
e.printStackTrace();
}
}

这究竟是怎么回事啊，怎么修改才能够跑通，本人新手，求各位大师帮忙，感激不尽

Answer 1

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