telnet.java

Java版的telnet 网络程序

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

/* Protocol :    Client ----------- Server
 *
 *                       <---------  <path> (single line)
 * (single line)  <cmd>  ---------->
 *                       <---------  <output> (several lines)
 *						 <---------	 ==end== (single line)
 *
 *                another session started again
 *
 *                       <---------  <path> (single line)
 *                       .....
 */

public class Telnet {
	static int port = 23;
	static final String endMsg = "==end==";
	
	public static void main(String[] args) throws Exception {
		if (args[0].equals("server"))
			runServer();
		else if (args[0].equals("client"))
			runClient(args[1], port);
		else
			System.out.println("Client : java Telnet client ip\r\n"+
							   "Server : java Telnet server");
	}	
	
	public static void runClient(String host, int port) throws Exception {
		System.out.println("Host " + host + "; port " + port);
		Socket socket = new Socket(host, port);
		new CommandClient(socket).start();
		System.out.println("Connected OK");
	}
	
	public static void runServer() throws Exception {
		ServerSocket server = new ServerSocket(port);  //