[NotInControl]

You can definitely use streams on the Java cRIO. We have been using TCP for years on our robot.

Here is some code to help you get started

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.ServerSocketConnection;
import javax.microedition.io.StreamConnection;
import org.team2168.utils.Util;


private int port;
private String messageOut;


private volatile boolean clientConnected;


// A TCP Socket Connection
private ServerSocketConnection conn = null;

// TCP Socket Stream
private StreamConnection sc = null;


// Address Variable
private String addressIn = "socket://:" + port;


// Opens a socket to listen for incoming connections
try{
	try {
		conn = (ServerSocketConnection) Connector
				.open(addressIn);

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

	// wait for a client to connect, this blocks until a connect
	// is made
	System.out.println("Listening on: "
			+ conn.getLocalAddress() + " on port: "
			+ conn.getLocalPort());
	sc = conn.acceptAndOpen();
	System.out.println("Client Connected");

} catch (IOException e) {

}

//To get the input stream
try {
	InputStream is = null;
	is = sc.openInputStream();
}catch (IOException x) {
	x.printStackTrace();
}


//Example to get the output stream
OutputStream os = null;
try {
	os = sc.openOutputStream();

	while (true) {
		//keep sending some message
		messageOut = "Some Message";

		buf = messageOut.getBytes("US_ASCII");

		try {
			os.write(buf);
		} catch (IOException e) {
			// e.printStackTrace();
			System.out.println("Appears Client Closed "
					+ "the Connection");

			// close streams
			os.close();
			sc.close();
			conn.close();

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

For 2015: Instead of using ServerSocketConnection and SocketConnection, just use ServerSocket and Socket classes to create TCP streams. It is much simpler to create a server in JavaSE

Here is an example for 2015 roboRio:

	// A TCP Socket Connection for RoboRio
	private ServerSocket listener = null;

	// TCP Socket Stream connection
	private Socket client = null;

        private int port;


        try {
		listener = new ServerSocket(port);
	} catch (IOException e) {
		e.printStackTrace();
	}

	// wait for a client to connect, this blocks the current thread until a connect
	// is made
	System.out.println("Listening on port: " + listener.getLocalPort());
	client = listener.accept();
        System.out.println("Client Connected");

//For the input stream, try the following:

try {
	DataInputStream is = new DataInputStream(client.getInputStream());
      } catch (IOException e) {
	 e.printStackTrace();
      }


//And for the outputstream try the following

try {
        DataOutputStream os = new DataOutputStream(client.getOutputStream());
     } catch (IOException e) {
         e.printStackTrace();
     }