FTP 425 Cannot open data connection

[wd9053]

在尝试写一个FTP客户端软件，现在能够正常登录，可是无法显示服务器列表
输入：LIST
输出：425 Cannot open data connection

进行了如下尝试：
输入：PASV
输出：227 Entering Passive Mode (*,*,*,*,131,132)
输入：LIST
输出：425 Cannot open data connection

输入：PORT *,*,*,*,10,223
输出：200 Port command successful.
输入：LIST
输出：425 Cannot open data connection

[wd9053]

PWD，CWD命令正常，ftp服务器正常（能够使用flashFXP上传下载），代码如下

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.InetAddress;
import java.net.Socket;

public class FTP
{
	private BufferedReader ftpBr;
	private BufferedWriter ftpBw;
	private BufferedReader stdBr = new BufferedReader(new InputStreamReader(System.in));
	private boolean run = true;
	
	public FTP()
	{
		try
		{
			connect();
		}
		catch(Exception ex)
		{
			ex.printStackTrace();
		}
	}
	
	public void connect() throws Exception
	{
		String temp;
		System.out.println("Input the ip address:");
		String ip = stdBr.readLine();
		System.out.println("Input the port:");
		int port = Integer.parseInt(stdBr.readLine());
		Socket aim = new Socket(ip, port);
		ftpBr = new BufferedReader(new InputStreamReader(aim.getInputStream()));
		ftpBw = new BufferedWriter(new OutputStreamWriter(aim.getOutputStream()));	
		new Thread()
		{
			public void run()
			{
				try
				{
					String temp;
					while(run)
					{
						temp = ftpBr.readLine();
						if(temp == null)
						{
							break;
						}						
						System.out.println(temp);
					}
					ftpBr.close();
				}
				catch(Exception ex)
				{
					ex.printStackTrace();
					return;
				}
			}
		}.start();
		
		while(!(temp = stdBr.readLine()).equals("QUIT"))
		{
			ftpBw.write(temp);
			ftpBw.newLine();
			ftpBw.flush();
		}
		
		ftpBw.write(stdBr.readLine());
		ftpBw.newLine();
		ftpBw.flush();
		ftpBw.close();
		stdBr.close();
		run = false;
	}
	
	public static void main(String[] args)
	{
		new FTP();
	}
}

[wd9053]

自己顶一下

[白云冰河]

咋不用commons-net来写呀

[feixianxxx]

防火墙的基本都是....