tcpserver.java

ssd8 exercise 3 Write a simple datagram client/server in Java and a tcp client/server also in java

import java.io.*;
import java.net.*;

/*
 * Created on 2008-4-12
 *
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 */

/**
 * @author Guest
 *
 * TODO To change the template for this generated type comment go to
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 */
public class TCPServer {

	/*
	 * Define the size of buffer to make sure that one packet contain one byte.
	 */
	private static int bufferSize = 1;
	
	/*
	 * Define the default port for the packet send to.
	 */
	private static int defaultPort = 8000;
	
	/*
	 * The main(String[]) method.
	 */
	public static void main(String[] args)throws Exception {
		
		/*
		 * The out to client Stream.
		 */
		DataOutputStream outToClient;
	
		/*
		 * The input from client stream.
		 */
		DataInputStream inFromClient;
		
		/*
		 * Create a tcp server socket.
		 */
		ServerSocket welcomeSocket = new ServerSocket(defaultPort);
		/*
		 * Declarate the receive byte. 
		 */
		byte receiveBuffer[] = new byte[bufferSize];
		
		System.out.println("connecting...");
		
		/*
		 * Initial the receive byte.
		 */
		receiveBuffer[0] = 0;
		
		while(true)
		{
			try
			{
			Socket connectionSocket = welcomeSocket.accept();
			outToClient = new DataOutputStream(connectionSocket.getOutputStream());
			inFromClient = new DataInputStream(connectionSocket.getInputStream());
			inFromClient.read(receiveBuffer);
			outToClient.write(receiveBuffer);
			outToClient.flush();
		    }catch (Exception e) {
				e.printStackTrace();
				System.err.println("Error!");
			}
		} 
		
	}
}