ジャワのUDPブロードキャストの典型的な

package com.ece.manager.web.deviceFB;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TestServer {
    public static void main(String[] args) {
        int port = 9090;//开启监听的端口
        DatagramSocket ds = null;
        DatagramPacket dp = null;
        byte[] buf = new byte[1024];//存储发来的消息
        StringBuffer sbuf = new StringBuffer();
        try {
            //绑定端口的
            ds = new DatagramSocket(port);
            dp = new DatagramPacket(buf, buf.length);
            System.out.println("监听广播端口打开：");
            ds.receive(dp);
            ds.close();
            int i;
            for(i=0;i<1024;i++){
                if(buf[i] == 0){
                    break;
                }
                sbuf.append((char) buf[i]);
            }			
            System.out.println("收到广播消息：" + sbuf.toString());
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } 
    }
}

package com.ece.manager.web.deviceFB;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;

public class Test {
 
    public static void main(String[] args) {
        // 广播的实现 :由客户端发出广播，服务器端接收
        String host = "255.255.255.255";//广播地址
        int port = 9090;//广播的目的端口
        String message = "test";//用于发送的字符串
        try {
            InetAddress adds = InetAddress.getByName(host);
            DatagramSocket ds = new DatagramSocket();
            DatagramPacket dp = new DatagramPacket(message.getBytes(),
                    message.length(), adds, port);
            ds.send(dp);
            ds.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } 
    }
}