echoserver.java

is a program that can send msg while the client connect to server

/*
 * EchoServer.java
 * @author  danes
 */
import java.io.*;
import java.net.*;

public class EchoServer {
 
  // constructor
    public EchoServer() {
//       
    }
    
    public static void main(String[] args) {
        try {
    
				ServerSocket s = new ServerSocket(Integer.parseInt(args[0]));
            while(true){
                Socket incoming = s.accept();
                BufferedReader in = new BufferedReader(new InputStreamReader(incoming.getInputStream()));
                PrintWriter out = new PrintWriter(new OutputStreamWriter(incoming.getOutputStream()));
                out.println("Hello ! This is the Java EchoServer.");
                out.println("Enter BYE to exit.");
                out.flush();
                
                while(true){
                    String str = in.readLine();
                    if (str == null ){
                        break;
                    } else {
                        out.println("Echo: " +str);
                        System.out.println("Read: " +str);
                        out.flush();
                        if (str.trim().equalsIgnoreCase("Bye")) // the'BYE' can be accepted in any CASE combination
                            break;
                    }
                }
                incoming.close();
            }
        } catch (Exception e){
            e.printStackTrace();
        }
    }
}