sender.java

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package com.j2medev.ch6.socket;

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

public class Sender extends Thread {
  private DataOutputStream dos;
    private String message;

    public Sender(DataOutputStream dos) {
        this.dos = dos;
        start();
    }

    public synchronized void send(String msg) {
        message = msg;
        //唤醒线程，发送数据
        notify();
    }

    public synchronized void run() {
        while (true) {
            //如果message=null那么等待
            if (message == null) {
                try {
                    wait();
                } catch (InterruptedException e) {
                }
            }
            if (message == null) {
                break;
            }
            try {
                dos.writeUTF(message);
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
            message = null;
        }
    }
    //停止
    public synchronized void stop() {
        message = null;
        notify();
    }
}