package SmtpServer;import java.net.Socket;import java.net.ServerSocket;import java.net.InetAddress;import java.io.InputStream;import java.io.OutputStream;import java.io.FileInputStream;import java.io.IOException;import java.io.File;import java.awt.event.*;import java.net.*;//RFC821public class SmtpServer{	public static final String rootDir = System.getProperty("user.dir") + File.separator  + "mailroot";	//default mail directory	public static final String domain = "MySMTP";	private final int smtpPort = 25;	public static void main(String[] args)  {    	SmtpServer server = new SmtpServer();	}	public SmtpServer() {		start();	}	public void start() {		System.out.println("My Smtp Sever Starting...");		ServerSocket serverSocket = null;    	try {			serverSocket =  new ServerSocket(smtpPort, 1);    	}    	catch (IOException e) {      		e.printStackTrace();      		System.exit(1);    	}		System.out.println("sever started");		    // Loop waiting for a request		while (true) {			Socket socket = null;			InputStream input = null;			OutputStream output = null;			try {				socket = serverSocket.accept();				System.out.println("receive a new request");				input = socket.getInputStream();				output = socket.getOutputStream();					// create Request object and parse				Request request = new Request(input);					// create Response object				Response response = new Response(output, input);				response.setRequest(request);					response.sendEventMsg(Response.WELCOME);		// send welcome massage				while(request.getRequestType()!=Request.QUIT) {					request.getMsg();					response.sendEventMsg(request.getRequestType());	    		}        		// Close the socket        		socket.close();      		}      		catch (Exception e) {        		e.printStackTrace();        		try {        			if (!socket.isClosed()) socket.close();        		}catch (Exception e2) {}        		continue;      		}    	}  	}}