Keskustelu: Ohjelmointikysymykset: Socket-ohjelmointi Javalla

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

    public class EchoClient {
        public static void main(String[] args) throws IOException {

            Socket echoSocket = null;
            PrintWriter out = null;
            BufferedReader in = null;
            try {
                echoSocket = new Socket("127.0.0.1", 9000);
                out = new PrintWriter(echoSocket.getOutputStream(), true);
                in = new BufferedReader(new InputStreamReader(
                                            echoSocket.getInputStream()));
            } catch (UnknownHostException e) {
                System.err.println("Don't know about host: localhost.");
                System.exit(1);
            } catch (IOException e) {
                System.err.println("Couldn't get I/O for "
                                   + "the connection to: 127.0.0.1");
                System.exit(1);
            }

    	BufferedReader stdIn = new BufferedReader(
                                       new InputStreamReader(System.in));
    	String userInput;

    	while ((userInput = stdIn.readLine()) != null) {
    	    out.println(userInput);
    	    System.out.println("echo: " + in.readLine());
    	}

    	out.close();
    	in.close();
    	stdIn.close();
    	echoSocket.close();
        }
    }