datagramsender.java

这是我在测试手机java程序时候做的关于手机java及时聊天的工具

/*
 * @(#)DatagramSender.java	1.6 03/03/02
 *
 * Copyright (c) 2003 Qualcomm, Inc. All rights reserved.
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms
 */
package com.qualcomm.demo.instantchat;

import javax.microedition.midlet.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import java.io.*;

public class DatagramSender extends Thread {

    private DatagramConnection dc;
    private String address;
    private String message;

    public DatagramSender(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 no client to deal, wait until one connects
            if (message == null) {
                try {
                    wait();
                } catch (InterruptedException e) {
                }
            }

            try {
                byte[] bytes = message.getBytes();
                Datagram dg = null;
                // Are we a sender thread for the client ? If so then there's
                // no address parameter
                if (address == null) {
                    dg = dc.newDatagram(bytes, bytes.length);
                } else {
                    dg = dc.newDatagram(bytes, bytes.length, address);
                }
                dc.send(dg);
            } catch (Exception ioe) {
                ioe.printStackTrace();
            }

            // Completed client handling, return handler to pool and
            // mark for wait
            message = null;
        }
    }

}