sender.java

j2me实例代码

package datagramSample;

import javax.microedition.io.Datagram;
import javax.microedition.io.DatagramConnection;

public class Sender extends Thread {
	private DatagramConnection dc;

	private String address;

	private String message;

	public Sender(DatagramConnection dc) {
		this.dc = dc;
		start();
	}

	public synchronized void send(String addr, String msg) {
		address = addr;
		message = msg;
		notify();
	}

	public synchronized void run() {
		while (true) {
			if (message == null) {
				try {
					wait();
				} catch (InterruptedException e) {
				}
			}
			try {
				byte[] bytes = message.getBytes();
				Datagram dg = null;

				if (address == null) {
					dg = dc.newDatagram(bytes, bytes.length);
				} else {
					dg = dc.newDatagram(bytes, bytes.length, address);
					System.out.println(address);
				}
				dc.send(dg);
			} catch (Exception ioe) {
				ioe.printStackTrace();
			}
			message = null;
		}
	}
}