import java.net.*;
import java.io.*;
import java.util.Date;

public class TimeServer{
	int port=13; //端口號
	ServerSocket serverSocket; //服務器套接字
	
	public TimeServer(){
		try{
			serverSocket=new ServerSocket(port); //實例化套接字
			System.out.println("start server at port "+port); //在命令窗口輸出提示信息
			
			while (true){	//一直等待客戶端連接		
				Socket client=serverSocket.accept();  //等待連接
				System.out.println("Connect from: "+client.getInetAddress());  //輸出客戶機地址
				PrintStream out=new PrintStream(client.getOutputStream()); //得到輸出流
				Date now=new Date(); //獲取當前時間
				out.println(now);  //輸出當前時間到客戶端					
			}
		}
		catch (IOException ex){
				ex.printStackTrace(); //輸出錯誤信息
		}					
	}
	
	public static void main(String[] args){
		new TimeServer();
	}
}