Question

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how to implement TCP server and TCP client in java to transfer files

I write application which will send files to server through socket. Its very important to all files came correct from client to server with no errors, lost data and other like that. To do that I need to use TCP protocol I think but I dont know how to do that. Is socket in Java is default using TCP. If not how can I send data through TCP? Thanks for any help and tip.

Answer 1

And here’s a good example from this thread Java TCP socket: data transfer is slow

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Transfer {

    public static void main(String[] args) {
        final String largeFile = "/home/dr/test.dat"; // REPLACE
        final int BUFFER_SIZE = 65536;
        new Thread(new Runnable() {
                public void run() {
                        try {
                                ServerSocket serverSocket = new ServerSocket(12345);
                                Socket clientSocket = serverSocket.accept();
                                long startTime = System.currentTimeMillis();
                                byte[] buffer = new byte[BUFFER_SIZE];
                                int read;
                                int totalRead = 0;
                                InputStream clientInputStream = clientSocket.getInputStream();
                                while ((read = clientInputStream.read(buffer)) != -1) {
                                        totalRead += read;
                                }
                                long endTime = System.currentTimeMillis();
                                System.out.println(totalRead + " bytes read in " + (endTime - startTime) + " ms.");
                        } catch (IOException e) {
                        }
                }
        }).start();
        new Thread(new Runnable() {
                public void run() {
                        try {
                                Thread.sleep(1000);
                                Socket socket = new Socket("localhost", 12345);
                                FileInputStream fileInputStream = new FileInputStream(largeFile);
                                OutputStream socketOutputStream = socket.getOutputStream();
                                long startTime = System.currentTimeMillis();
                                byte[] buffer = new byte[BUFFER_SIZE];
                                int read;
                                int readTotal = 0;
                                while ((read = fileInputStream.read(buffer)) != -1) {
                                        socketOutputStream.write(buffer, 0, read);
                                        readTotal += read;
                                }
                                socketOutputStream.close();
                                fileInputStream.close();
                                socket.close();
                                long endTime = System.currentTimeMillis();
                                System.out.println(readTotal + " bytes written in " + (endTime - startTime) + " ms.");
                        } catch (Exception e) {
                        }
                }
        }).start();
    }
}