一个时间服务器简单实现

import Java.io.IOException;

import java.util.Calendar;

import java.util.Date;

import javax.microedition.io.Connector;

import javax.microedition.io.Datagram;

import javax.microedition.io.DatagramConnection;

public class TimeServer {

public static void main(String[] args) {

try {

Calendar cal = Calendar.getInstance();

DatagramConnection receiver =

(DatagramConnection)Connector.open("datagram://:13");

byte[] buffer = new byte[256];

Datagram dgram = receiver.newDatagram(buffer, buffer.length);

for (;;) {

dgram.setLength(buffer.length);

// Wait for somebody to call...

receiver.receive(dgram);

// Get the time and store it in the buffer

cal.setTime(new Date());

String time = cal.toString();

byte[] dataBytes = time.getBytes();

System.arraycopy(dataBytes, 0, buffer, 0, dataBytes.length);

// Send back the reply

dgram.setLength(dataBytes.length);

receiver.send(dgram);

}

} catch (IOException ex) {

System.out.println("IOException: " + ex);

}

}

}

（出处：http://www.knowsky.com）