tcpServer.java

// tcpServer.java by fpont 3/2000

// usage : java tcpServer <port number>.
// default port is 1500.
// connection to be closed by client.
// this server handles only 1 connection.

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

public class tcpServer {
    
    public static void main(String args[]) {
	
	int port;
	ServerSocket server_socket;
	BufferedReader input;
	BufferedWriter output;
	try { 
	    port = Integer.parseInt(args[0]);
	}
	catch (Exception e) {
	    System.out.println("port = 1500 (default)");
	    port = 1500;
	}

	try {
	    
	    server_socket = new ServerSocket(port);
	    System.out.println("Server waiting for client on port " +
			       server_socket.getLocalPort());
	    
	    // server infinite loop
	    while(true) {
		Socket socket = server_socket.accept();
		System.out.println("New connection accepted " +
				   socket.getInetAddress() +
				   ":" + socket.getPort());


    input = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    output = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
		// print received data
		try {

		    while(true) {
      char[] buf = new char[20];

       input.read(buf,0,20);
       if (buf==null) {
       return;
       }
        System.out.println(buf);
      // input.close();


       // output.flush();
//        for(int i=0;i<15;i++)
        {
        //Flushing the output after the write will immediatly intimate the client
            output.write(buf,0,20);
            output.flush();
        }
          //output.write(buf);
        //output.flush();


		    }
		}
		catch (IOException e) {
		    System.out.println(e);
		}


		// connection closed by client
		try {
		    socket.close();
		    System.out.println("Connection closed by client");
		}
		catch (IOException e) {
		    System.out.println(e);
		}
		
	    }
	    
	    
	}
	
	catch (IOException e) {
	    System.out.println(e);
	}
    }
}