jconnection.java

JAVA FTP客户端经典

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package net.sf.jftp.net;

import net.sf.jftp.config.Settings;
import net.sf.jftp.util.Log;

import java.net.*;
import java.io.*;

/**
 * Basic class for getting an TCP/IP-Connection
 * timeout sets (as the name says) the maximum time the Thread
 * waits for the target host...
 */

public class JConnection implements Runnable
{
    private int timeout = Settings.connectionTimeout;

    private String host;
    private int port;

    private PrintStream out;
    private BufferedReader in;
    private Socket s;
    private boolean isOk = false;
    private boolean established = false;
    private boolean reciever = false;
    private Thread runner;
    private int localPort = -1;
    private int time = 0;

    public JConnection(String host, int port)
    {
        this.host = host;
        this.port = port;

        runner = new Thread(this);
        runner.start();
    }

    public JConnection(String host, int port, int time)
    {
        this.host = host;
        this.port = port;
	this.timeout = time;
	this.time = time;

        runner = new Thread(this);
        runner.start();
    }

    public void run()
    {
        try
        {
            s = new Socket(host, port);
            localPort = s.getLocalPort();
            //if(time > 0) s.setSoTimeout(time);

            out = new PrintStream(new BufferedOutputStream(s.getOutputStream(), Settings.bufferSize));
            in = new BufferedReader(new InputStreamReader(s.getInputStream()), Settings.bufferSize);
            isOk = true;
        }
        catch(Exception ex)
        {
            //ex.printStackTrace();
            isOk = false;
        }
        established = true;
    }

    public boolean isThere()
    {
        int cnt = 0;
        while(!established && cnt<timeout)
        {
            pause(100);
            cnt = cnt+100;
	    //System.out.println(cnt + "/" + timeout);
        }
        return isOk;
    }

    public void send(String data)
    {
        try
        {
            out.print(data);
            out.print("\r\n");
            out.flush();
            if (data.startsWith("PASS"))
                Log.debug("> PASS ****");
            else
                Log.debug("> " + data);
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

    public PrintStream getInetOutputStream()
    {
        return out;
    }

    public BufferedReader getReader()
    {
        return in;
    }

    public int getLocalPort()
    {
        return localPort;
    }

    public InetAddress getLocalAddress() throws IOException
    {
        return s.getLocalAddress();
    }

    private void pause(int time)
    {
        try
        {
            Thread.sleep(time);
        }
        catch(Exception ex)
        {
        }
    }
}