user3011052:

I need to create a P2P application in java that can send messages to other applications that use the same protocol.

In order to connect with another application, I must pass in their IP and Port through the command line and connect to it.

This is the problem, I am unable to find out how to connect (establish the connection) given the IP and port number.

My professor has set up a test peer on:

honeybee.cs.usm.maine.edu

port 12030

The IP is for honeybee.cs.usm.maine.edu is 130.111.131.121

So my question is how do I establish a connection to this port on this server?

I just want to be able to send and recieve strings from the test peer.

Right now the only way I can do this is through telnet with

telnet 130.111.131.121 12030

So far I have:

    public static void main(String[] args) throws UnknownHostException, IOException {

    int portNumber = 12038;
    String recieverIP = "130.111.131.121";
    int recieverPort = 12030;

    ServerSocket serverSocket = new ServerSocket(portNumber);
    System.out.println("Creating server socket on Port " + portNumber);

    Socket clientSocket = new Socket(recieverIP, recieverPort);
    System.out.println("Establishing connection to " + recieverIP + " on port " + recieverPort);

    OutputStream os = clientSocket.getOutputStream();
    PrintWriter pw = new PrintWriter(os, true);

    try {

        BufferedReader input = new BufferedReader(new InputStreamReader(clientSocket.getInputStream())); //input stream    
        PrintStream output = new PrintStream(new BufferedOutputStream(clientSocket.getOutputStream())); //output stream

        String Test = "Sending This String";

        pw.println(Test); // sends the string to server   

        String readIn = input.readLine(); // should give back an error message but it doesn't!
        System.out.println("message recieved " + readIn);

        } catch (IOException e) { e.printStackTrace(); } 

}

I basically want to be able to send and recieve a string between this server.