dataconnection.java

一个JAVA做的FTP软件,带源码的,可以很好的进行二次开发,,并带有详细说明文件的

/*
 * 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.io.*;

import java.net.*;

import java.util.*;


/**
* This class represents a ftp data connection.
* It is used internally by FtpConnection, so you probably don't have to use it directly.
*/
public class DataConnection implements Runnable
{
    public final static String GET = "GET";
    public final static String PUT = "PUT";
    public final static String FAILED = "FAILED";
    public final static String FINISHED = "FINISHED";
    public final static String DFINISHED = "DFINISHED";
    public final static String GETDIR = "DGET";
    public final static String PUTDIR = "DPUT";
    private BufferedInputStream in = null;
    private BufferedOutputStream out = null;
    private Thread reciever;
    private int port = 7000;
    public Socket sock = null;
    private ServerSocket ssock = null;
    private String type;
    private String file;
    private String host;
    private boolean resume = false;
    public boolean finished = false;
    private boolean isThere = false;
    private long start;
    private FtpConnection con;
    private int skiplen = 0;
    private boolean justStream = false;
    private boolean ok = true;
    private String localfile = null;

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        reciever = new Thread(this);
        reciever.start();
    }

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type, boolean resume)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        this.resume = resume;

        //resume = false;
        reciever = new Thread(this);
        reciever.start();
    }

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type, boolean resume,
                          boolean justStream)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        this.resume = resume;
        this.justStream = justStream;

        //resume = false;
        reciever = new Thread(this);
        reciever.start();
    }

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type, boolean resume,
                          String localfile)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        this.resume = resume;
        this.localfile = localfile;

        //resume = false;
        reciever = new Thread(this);
        reciever.start();
    }

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type, boolean resume, int skiplen)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        this.resume = resume;
        this.skiplen = skiplen;

        //resume = false;
        reciever = new Thread(this);
        reciever.start();
    }

    public DataConnection(FtpConnection con, int port, String host,
                          String file, String type, boolean resume,
                          int skiplen, InputStream i)
    {
        this.con = con;
        this.file = file;
        this.host = host;
        this.port = port;
        this.type = type;
        this.resume = resume;
        this.skiplen = skiplen;

        if(i != null)
        {
            this.in = new BufferedInputStream(i);
        }

        //resume = false;
        reciever = new Thread(this);
        reciever.start();
    }

    public void run()
    {
        try
        {
            if(Settings.getFtpPasvMode())
            {
                try
                {
                    sock = new Socket(host, port);
                    sock.setSoTimeout(Settings.getSocketTimeout());
                }
                catch(Exception ex)
                {
                    ok = false;
                    debug("Can't open Socket on port " + port);
                }
            }
            else
            {
                //Log.debug("trying new server socket: "+port);
                try
                {
                    ssock = new ServerSocket(port);
                }
                catch(Exception ex)
                {
                    ok = false;
                    Log.debug("Can't open ServerSocket on port " + port);
                }
            }
        }
        catch(Exception ex)
        {
            debug(ex.toString());
        }

        isThere = true;

        boolean ok = true;

        try
        {
            if(!Settings.getFtpPasvMode())
            {
                int retry = 0;

                while((retry++ < 5) && (sock == null))
                {
                    try
                    {
                        ssock.setSoTimeout(Settings.connectionTimeout);
                        sock = ssock.accept();
                    }
                    catch(IOException e)
                    {
                        sock = null;
                        debug("Got IOException while trying to open a socket!");

                        if(retry == 5)
                        {
                            debug("Connection failed, tried 5 times - maybe try a higher timeout in Settings.java...");
                        }

                        throw e;
                    }
                    finally
                    {
                        ssock.close();
                    }

                    debug("Attempt timed out, retrying...");
                }
            }

            if(ok)
            {
                isThere = true;

                byte[] buf = new byte[Settings.bufferSize];
                start = System.currentTimeMillis();

                int buflen = 0;

                if(type.equals(GET) || type.equals(GETDIR))
                {
                    RandomAccessFile fOut = null;
                    BufferedOutputStream bOut = null;

                    if(!justStream)
                    {
                        try
                        {
                            if(resume)
                            {
                                File f = new File(file);
                                fOut = new RandomAccessFile(file, "rw");
                                fOut.skipBytes((int) f.length());
                                buflen = (int) f.length();
                            }
                            else
                            {
                                if(localfile == null)
                                {
                                    localfile = file;
                                }

                                File f = new File(localfile);

                                if(f.exists())
                                {
                                    f.delete();
                                }

                                bOut = new BufferedOutputStream(new FileOutputStream(localfile),
                                                                Settings.bufferSize);
                            }
                        }
                        catch(Exception ex)
                        {
                            debug("Can't create outputfile: " + file);
                            ok = false;
                            ex.printStackTrace();
                        }
                    }

                    if(ok)
                    {
                        try
                        {
                            in = new BufferedInputStream(sock.getInputStream(),
                                                         Settings.bufferSize);

                            if(justStream)
                            {
                                return;
                            }
                        }
                        catch(Exception ex)
                        {
                            ok = false;
                            debug("Can't get InputStream");
                        }

                        if(ok)
                        {
                            try
                            {
                                int len = buflen;

                                if(fOut != null)
                                {
                                    while(true)
                                    {
                                        // resuming
                                        int read;

                                        try
                                        {
                                            read = in.read(buf);
                                        }
                                        catch(IOException es)
                                        {
                                            Log.out("got a IOException");
                                            ok = false;
                                            fOut.close();