Transfer a file via Socket : Socket « Network « Java Tutorial

1. Java Tutorial
2. Network
3. Socket

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Main {
  public static void main(String[] args) throws IOException {
    ServerSocket servsock = new ServerSocket(123456);
    File myFile = new File("s.pdf");
    while (true) {
      Socket sock = servsock.accept();
      byte[] mybytearray = new byte[(int) myFile.length()];
      BufferedInputStream bis = new BufferedInputStream(new FileInputStream(myFile));
      bis.read(mybytearray, 0, mybytearray.length);
      OutputStream os = sock.getOutputStream();
      os.write(mybytearray, 0, mybytearray.length);
      os.flush();
      sock.close();
    }
  }
}

The client module

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.Socket;

public class Main {
  public static void main(String[] argv) throws Exception {
    Socket sock = new Socket("127.0.0.1", 123456);
    byte[] mybytearray = new byte[1024];
    InputStream is = sock.getInputStream();
    FileOutputStream fos = new FileOutputStream("s.pdf");
    BufferedOutputStream bos = new BufferedOutputStream(fos);
    int bytesRead = is.read(mybytearray, 0, mybytearray.length);
    bos.write(mybytearray, 0, bytesRead);
    bos.close();
    sock.close();
  }
}