A mini echo-server, I used for testing connectivity through mobile operator proxies. Feb 21, 2004

IpOperator.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class IpOperator {
    public static void main(String[] args) throws IOException {
        int port = 80;
        ServerSocket srv = new ServerSocket(port);
        try {
            while (true) {
                final Socket socket = srv.accept();
                System.out.println("== NEW Connection at port " + port + " from " + socket.getInetAddress().getCanonicalHostName() + ":" + socket.getPort());
                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                final PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
                final BufferedReader operator = new BufferedReader(new InputStreamReader(System.in));
                new Thread() {
                    public void run() {
                        try {
                            try {
                                String line = operator.readLine();
                                if (line.equals("over")) return;
                                out.println(line);
                            } finally {
                                socket.close();
                            }
                        } catch (IOException e) {
                            throw new Error(e.toString());
                        }

                    }
                };
                do {
                    System.out.println("IN> " + in.readLine());
                } while (!socket.isClosed());
                System.out.println("== Connection closed: " + socket.getInetAddress().getCanonicalHostName() + ":" + socket.getPort());
            }
        } finally {
            srv.close();
        }
    }
}