it copy the file with 0 kb.
can anyone please help me.
I am working in this over a week no progress.

server class

package javaapplication29;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.net.ServerSocket;
import java.net.Socket;

public class Server
{

public static void main(String[] args) throws IOException
{
    ServerSocket serverSocket = null;
boolean listening = true;
try
{
serverSocket = new ServerSocket(7777);
}
catch (IOException e)
{
System.err.println("Could not listen on port: 7777");
System.exit(1);
}
System.out.println("Multi server ready");
Socket socket = null;

while (listening)
{

try
{

socket = serverSocket.accept();

new EchoThread(socket).start();

}
catch (IOException e)
{
System.err.println("Accept failed.");
System.exit(1);
}
}
serverSocket.close();
}
}

class EchoThread extends Thread
{
//    Library lib = new Library();
    private Socket socket = null;
    public EchoThread(Socket socket)
{
this.socket = socket;

    }

public void run()
{
    System.out.println("enter to run1");
        Socket incomingConnection = null;
        incomingConnection = socket;
        ResultSet rs;
        PrintWriter out;
        BufferedReader in;
        String inputLine = null;

        try
{
            
			
            out = new PrintWriter(socket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
do {
                
                inputLine = in.readLine();
                System.out.println("the input is----:"+inputLine);
                String [] newinputLine = null;
                newinputLine = inputLine.split("#");
                System.out.println(newinputLine[0]);

//              /*
//               * Add Movie
//               * add's new movie to database
//               */
//              if (newinputLine[0].matches("add movie")){
//             lib.addItem(newinputLine[1],newinputLine[2],Integer.parseInt(newinputLine[3]),newinputLine[4],Integer.parseInt(newinputLine[5]),newinputLine[6],newinputLine[7],newinputLine[8],newinputLine[9],Integer.parseInt(newinputLine[10]));
//       out.println(inputLine);
//              }
//              /*
//               * Add Song
//               * add's new song to database
//               */
//                else if (newinputLine[0].matches("add song")){
//             lib.addItem(newinputLine[1],newinputLine[2],Integer.parseInt(newinputLine[3]),newinputLine[4],Integer.parseInt(newinputLine[5]),newinputLine[6],newinputLine[7],newinputLine[8],newinputLine[9],Integer.parseInt(newinputLine[10]));
//       out.println(inputLine);
//
//              }
//              /*
//               * Search by Movies Year
//               * returns movie between years ("year 1" and "year 2")
//               */
//              else if (newinputLine[0].matches("search movies by year")){
//                      String ReturnString="";
//
//                System.out.println(newinputLine[1]);
//                rs = lib.searchByYearMovie(Integer.parseInt(newinputLine[1]),Integer.parseInt(newinputLine[2]));
//                System.out.println(" first ReturnString:" + ReturnString);
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                  System.out.println(ReturnString);
//                  out.println(ReturnString);
//                  System.out.println("search Movies by year ends");
//              }
//              /*
//               * Search Songs by Year
//               * returns songs between years ("year 1" and "year 2")
//               */
//              else if (newinputLine[0].matches("search songs by year")){
//
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                System.out.println("newinputLine[1] : "+newinputLine[1]);
//                rs = lib.searchByYearSong(Integer.parseInt(newinputLine[1]),Integer.parseInt(newinputLine[2]));
//
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//
//
//                  out.println(ReturnString);
//                  System.out.println("search Songs by year ends");
//              }
//              /*
//               * Search movie
//               * returns all the movies
//               */
//              else if (newinputLine[0].matches("search movie")){
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                rs = lib.ShowAllMovies();
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//
//
//                  out.println(ReturnString);
//                  System.out.println("search by name ends");
//                }
//              /*
//               * Search Song
//               * returns all the songs
//               */
//              else if (newinputLine[0].matches("search song")){
//                   String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                rs = lib.ShowAllSongs();
//
//                try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                  out.println(ReturnString);
//                  System.out.println("search by name ends");
//              }
//              /*
//               * Search Movies by Category
//               * returns all the movies with the same category
//               */
//              else if (newinputLine[0].matches("search movies by category")){
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                System.out.println(newinputLine[1]);
//                rs = lib.searchByCatogorMovie(newinputLine[1]);
//
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//                  out.println(ReturnString);
//                  System.out.println("Search Movies by Category ends");
//
//              }
//              /*
//               * Search Movies by Name
//               * returns all the movies with the same name
//               */
//              else if (newinputLine[0].matches("search movies by name")){
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                System.out.println(newinputLine[1]);
//                rs = lib.searchByNameMovie(newinputLine[1]);
//
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//                  out.println(ReturnString);
//              }
//
//              /*
//               * Search Song by Name
//               * returns all the song with the same name
//               */
//              else if (newinputLine[0].matches("search Song by name")){
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                System.out.println(newinputLine[1]);
//                rs = lib.searchByNameSong(newinputLine[1]);
//
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//                  out.println(ReturnString);
//              }
//
//               /*
//               * Search Songs by Category
//               * returns all the songs with the same Category
//               */
//              else if (newinputLine[0].matches("search songs by category")){
//
//                String ReturnString="";
//                System.out.println(" first ReturnString:" + ReturnString);
//                System.out.println(newinputLine[1]);
//                rs = lib.searchByCatogorSong(newinputLine[1]);
//
//                    try {
//                        while (rs.next()) {
//                            ReturnString = ReturnString + rs.getString(1) + "#" + rs.getString(2) + "#" + rs.getString(3) + "#" + rs.getString(4) + "#" + rs.getString(5) + "#" + rs.getString(6) + "#" + rs.getString(7) + "#" + rs.getString(8) + "#" + rs.getString(9) + "#" + rs.getString(10) + "@";
//                            System.out.println("while ReturnString:" + ReturnString);
//                        }
//                    } catch (SQLException ex) {
//                        System.out.println("catch no resaultset");
//                        Logger.getLogger(EchoThread.class.getName()).log(Level.SEVERE, null, ex);
//                    }
//                    System.out.println(ReturnString);
//                  out.println(ReturnString);
//                  System.out.println("Search Songs by Category ends");
//
//              }
//                /*
//               * Delite All
//               * delets all movie and Song
//               */
//              else if (newinputLine[0].matches("delete all")){
//                  lib.removeAll();
//                  System.out.println("deta base clear");
//                  out.println(inputLine);
//              }
//              /*
//               * Delite by Name
//               * delets one movie by name(works on the id)
//               */
//                else if (newinputLine[0].matches("delete by name")){
//               System.out.println("enter to delete by name" );
//               lib.removeItem(newinputLine[1], Integer.parseInt(newinputLine[2]));
//               out.println(inputLine);
//              }
//              /*
//               * Send Movie
//               * send the file of the movie to server
//               */
//              else if (newinputLine[0].matches("sends movie")){
//              }
//              /*
//               * Send Song
//               * send the file of the song to server
//               */
//              else if (newinputLine[0].matches("sends song")){
//              }
//              /*
//               * Get Movie
//               * download the movie from server
//               */
//              else if (newinputLine[0].matches("get movie")){
//              }
//              /*
//               * Get Song
//               * download the song from server
//               */
//              else if (newinputLine[0].matches("get song")){
//              }
//               /*
//               * Edit Song
//               * Edit  Song  or Movie to Data Base
//               */
//              else if (newinputLine[0].matches("edit items")){
//               System.out.println( newinputLine[0]);
//               lib.editItem(newinputLine[1],newinputLine[2],newinputLine[3],Integer.parseInt(newinputLine[4]),newinputLine[5],Integer.parseInt(newinputLine[6]),newinputLine[7],newinputLine[8],newinputLine[9],newinputLine[10],Integer.parseInt(newinputLine[11]));
//               out.println(inputLine);
//              }
               /*
               * copy file - here is the problem
               * Edit  Song  or Movie to Data Base
               */
              
                  System.out.println( "working");
                 handleConnection(socket);

//              out.println(inputLine);

}
while(inputLine.toUpperCase().equals("END")==false);
out.close();
in.close();
socket.close();
}
catch (IOException e)
{
System.out.println("couldn't read from connection");
}
}
	/**
	 * Interacts with the client Socket to send the contents of the requested
	 * file to the client.
	 *
	 * @param incomingConnection
	 */
	public void handleConnection(Socket connectionToHandle) {
		new Thread(new ConnectionHandler(connectionToHandle)).start();
	}
}

client class:

/**
 * 
 */
package javaapplication29;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * The client uses Socket to connect to a server. The server listens on port
 * 3000 with a ServerSocket. The client requests the contents of a file on the
 * server's path.
 * 
 * @author Natalie
 * 
 */
public class RemoteFileClient {
	protected String hostIp;
	protected int hostPort;
	protected InputStream socketReader;
	protected PrintWriter socketWriter;
	protected FileOutputStream out;

	/**
	 * The Constructor of our class takes an IP address and a port number for a
	 * remote host and assigns them to instance variables.
	 */
	public RemoteFileClient(String aHostIp, int aHostPort) {
		hostIp = aHostIp;
		hostPort = aHostPort;
	}

	/**
	 * main Creates the RemoteFileClient, use it to get the contents of a remote
	 * file, and then prints the result.
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		RemoteFileClient remoteFileClient = new RemoteFileClient("127.0.0.1",
				7777);
		// Open connection with server
		remoteFileClient.setUpConnection();

		File fileDst = new File("D:\\cool\\Michael Jackson - Pepsi Adverteint.mpg");
		remoteFileClient.downloadByteFile("D:\\Michael Jackson - Pepsi Adverteint.mpg",
				fileDst);
                System.out.println("close the connection with server");
		// close the connection with server
		remoteFileClient.tearDownConnection();

	}

	/**
	 * Connect to remote server. It will set up our Socket and give us access to
	 * its streams.
	 */
	public void setUpConnection() {
		try {
			Socket client = new Socket(hostIp, hostPort);
			System.out.println("Multithreaded Client: Connected...");

			socketReader = client.getInputStream();
			socketWriter = new PrintWriter(client.getOutputStream());

		} catch (UnknownHostException e) {
			System.out
					.println("Error setting up socket connection: unknown host at "
							+ hostIp + ":" + hostPort);
		} catch (IOException e) {
			System.out.println("Error setting up socket connection: " + e);
		}
	}

	/**
	 * Ask the remote server for the contents of file.
	 * 
	 * @param fileNameToGet
	 * @return
	 */
	public void downloadByteFile(String fileNameToGet, File fileDst) {

//		src.RemoteFileClient.createAfileIfNotExists(fileDst);

		try {
			// send request to the host
			System.out
					.println("Multithreaded Client: send file path to server");
			socketWriter.println(fileNameToGet);
			socketWriter.flush();
			System.out.println("Multithreaded Client: file path has sent");

			DataInputStream in = new DataInputStream(socketReader);

			// client send file path to server
			out = new FileOutputStream(fileDst);

			// client got file size from server
			System.out.println("Multithreaded Client: wait for file size");
			Long fileSize = in.readLong();
			System.out.println("Multithreaded Client: got file size");

			if (fileSize != null) {

				int received = 0;
				byte[] buff = new byte[1024];

				System.out
						.println("Multithreaded Client: starting download...");
				long sizeCount = 0;
				while (((received = in.read(buff)) > 0)) {
					out.write(buff, 0, received);
					sizeCount = sizeCount + received;
					System.out.println("sent" + sizeCount);

					if ((sizeCount >= fileSize)) {
						break;
					}
				}
				out.close();
				System.out
						.println("Multithreaded Client: download complete successfully!");
			}

			System.out
					.println("Multithreaded Client: notify server about download success.");
			socketWriter.println("Got");
			socketWriter.flush();
			System.out.println("Multithreaded Client: client finished.");

			in.close();

		} catch (IOException e) {
			System.out.println("Multithreaded Client: Error reading from file "
					+ fileNameToGet);
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					System.out
							.println("Multithreaded Client: Error wile trying to close a file "
									+ fileDst.getName());
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * Disconnect from the remote server.
	 */
	public void tearDownConnection() {
		try {
			socketWriter.close();
			socketReader.close();
			System.out.println("Multithreaded Client: connection closed");
		} catch (IOException e) {
			System.out
					.println("Multithreaded Client: Error tearing down the connection\n"
							+ e.getStackTrace());
		}
	}

}

ConnectionHandler class:

/**
 * 
 */
package javaapplication29;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.Socket;


/**
 * @author Natalie
 * 
 */
public class ConnectionHandler implements Runnable {
	Socket socketToHandle;

	/**
	 * Constructor
	 * 
	 * @param aSocketToHande
	 */
	public ConnectionHandler(Socket aSocketToHande) {
		socketToHandle = aSocketToHande;
	}

	public void run() {
		try {
			DataOutputStream streamWriter = new DataOutputStream(socketToHandle
					.getOutputStream());
			BufferedReader streamReader = new BufferedReader(
					new InputStreamReader(socketToHandle.getInputStream()));

			// Server get file path from client
			String fileToRead = streamReader.readLine();
			File file = null;

			if (fileToRead != null) {
				file = new File(fileToRead);

				// Server send file size in bytes to client
				streamWriter.writeLong(file.length());
			System.out.println(" File Length" + file.length());
            }
            
			System.out.println("Multithreaded Server: Starting send a file..."
					+ fileToRead);
			FileInputStream fileReader = new FileInputStream(fileToRead);
            
			byte[] buff = new byte[1024];
			int sent = 0;

			while ((sent = fileReader.read(buff)) > 0) {
				streamWriter.write(buff, 0, sent);
             System.out.println("while");
			}
			fileReader.close();

			// get message from client if he got a file successfully
			String status = streamReader.readLine();
			System.out.println("Multithreaded Server: client recieve status "
					+ status);

			if (status.equalsIgnoreCase("got")) {
				System.out.println("Multithreaded Server: Sent successfully!");
			} else {
				System.out
						.println("Multithreaded Server: Error in sending file!");
			}
			streamWriter.close();
			streamReader.close();

			System.out.println("Multithreaded Server: Stoped...");
		} catch (Exception e) {
			System.out
					.println("Multithreaded Server: Erro handling a client\n "
							+ e.getStackTrace());
		}

	}

}

Hi,

I found your mistake! After client sent the file name you first read it. And second time you try to read file name from client but client already wrote it. So server waits client to write the file name.

I changed EchoThread class a bit and it worked!

EchoThread is as follows:

class EchoThread extends Thread {
    private Socket socket = null;

 public EchoThread(Socket socket) {
        this.socket = socket;
    }

  public void run() {
           // now we are not reading file name here (!) 
            System.out.println("working");
            handleConnection(socket);
    }

public void handleConnection(Socket connectionToHandle) {
  new Thread(new ConnectionHandler(connectionToHandle)).start();
 }

}

goodbye :icon_smile:

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