import java.io.*;
import java.net.*;
 
public class TcpTestServer {
 
    public TcpTestServer() {
    }
 
    public static void main(String[] args) {
        try {
            ServerSocket socketServer = new ServerSocket(6789);
            while (true) {
                Socket socketClient = socketServer.accept();
                System.out.println("socket connected...");
                if (socketClient != null) {
                    new ClientHandler(socketClient).start();
                }
            }
        } catch (IOException objIOException) {
            objIOException.printStackTrace();
        }
    }
}
 

 
import java.io.*;
import java.net.*;
 
class ClientHandler extends Thread {
 
private Socket m_socketClient = null;
 
    public ClientHandler(Socket socket) {
        m_socketClient = socket;
    }
 
    public void run() {
        try {
            // receive from client
            // received
            InputStream in = null;
            BufferedInputStream bin = null;
            in = m_socketClient.getInputStream();
            bin = new BufferedInputStream(in);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int read;
            while ((read = bin.read()) != -1) {
                baos.write(read);
            }
 
            System.out.println(baos);
            baos.flush();
 
            // send to client
            String msg = "Server received...";
            OutputStream out = null;
            BufferedOutputStream bout = null;
            out = m_socketClient.getOutputStream();
            bout = new BufferedOutputStream(out);
            bout.write(msg.getBytes());
            bout.flush();
 
            out.close();
            in.close();
            m_socketClient.close();
        } catch (IOException objIOException) {
            objIOException.printStackTrace();
        }
    }
}

import java.io.*;
import java.net.*;
 
public class TcpTestClient {
 
    public TcpTestClient() {
    }
 
    public static void main(String[] args) {
        try {
            Socket socketClient = new Socket(localhost, 6789);
            //socketClient.connect(new InetSocketAddress(InetAddress.getByName("220.95.213.193"), 6789), 1000) ;
            String boundary = "11111";
            String msg = "POST /mmsr30/mm7 HTTP/1.1" + "\r\n";
            msg = msg + "host: vmg.nate.com" + "\r\n";
            msg = msg + "Content-Type: multipart/related; type=\"text/xml\"; boundary=\"" 
            + boundary + "\"" + "\r\n";
            msg = msg + "Connection: Close" + "\r\n";
            msg = msg + "SOAPAction: \"\"" + "\r\n\r\n";
 
            OutputStream out = null;
            BufferedOutputStream bout = null;
 
            InputStream in = null;
            BufferedInputStream bin = null;
 
            out = socketClient.getOutputStream();
            bout = new BufferedOutputStream(out);
 
            in = socketClient.getInputStream();
            bin = new BufferedInputStream(in);
 
            bout.write(msg.getBytes());
            bout.flush();
 
            // 결과 수신
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            int read;
            while ((read = bin.read()) != -1) {
                baos.write(read);
            }
 
            System.out.println(baos);
 
            baos.flush();
 
            socketClient.close();
        } catch (UnknownHostException objUnknownHostException) {
            objUnknownHostException.printStackTrace();
        } catch (SocketTimeoutException objSocketTimeoutException) {
            objSocketTimeoutException.printStackTrace();
        } catch (IOException objIOException) {
            objIOException.printStackTrace();
        } catch (Exception objException) {
            objException.printStackTrace();
        }
    }
}