Java学习_ _Upd程序设计_天气预报信号接收器

import java.net.DatagramPacket;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.security.acl.Group;

import javax.swing.plaf.multi.MultiButtonUI;


public class Weather extends Thread{
	String weather="天气预报，今天下雨";
	int port=9897;
	InetAddress iaddress=null;					//创建inetAddress地址对象；
	MulticastSocket socket=null; 				//创建多点广播套接字；
	Weather(){									//构造函数
		try {
			iaddress=InetAddress.getByName("224.255.10.0");	//指定广播的地址
			socket=new MulticastSocket(port);				//套接字端口设置
			socket.setTimeToLive(1);						//指定发送范围为本地网络
			socket.joinGroup(iaddress);						//将地址加入广播组
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	public void run(){										//重写线程的run
		while(true){	
			DatagramPacket packet=null;						//数据包
			byte data[]=weather.getBytes();					//声明字节数组
			packet=new DatagramPacket(data, data.length,iaddress,port);
			System.out.println(new String(data));
			try {
				socket.send(packet);
				sleep(3000);
			} catch (Exception e) {
				// TODO: handle exception
				//e.printStackTrace();
			}
		}
	}
	public static void main(String[] args) {
		Weather w=new Weather();
		w.start();
	}

}

主机代码：

单独运行截图：

客户端代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.plaf.multi.MultiButtonUI;


public class Receive extends JFrame implements Runnable,ActionListener{
	int port;					//端口
	InetAddress group=null;				//声明inetDress 地址
	MulticastSocket socket=null;    		//多点广播套用字
	JButton ince=new JButton("开始接收");		//创建按钮对象
	JButton stop=new JButton("停止接收");		//me too
	JTextArea inceAr=new JTextArea(10,10);		//显示接受广播的文本域
	JTextArea inced=new JTextArea(10,10);
	Thread thread;					//线程
	boolean b=false;				//创建boolean型变量
	public Receive(){				//构造						
		super("广播数据报");	
		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);//以下为窗体布局设计
		thread=new Thread(this);
		ince.addActionListener(this);
		stop.addActionListener(this);
		inceAr.setForeground(Color.blue);
		JPanel northJPanel=new JPanel();
		northJPanel.add(ince);
		northJPanel.add(stop);
		add(northJPanel,BorderLayout.NORTH);
		JPanel centerJPanel=new JPanel();
		centerJPanel.setLayout(new GridLayout(1,2));
		centerJPanel.add(inceAr);
		centerJPanel.add(inced);
		add(centerJPanel,BorderLayout.CENTER);
		validate();
		port=9897;
		try {
			group=InetAddress.getByName("224.255.10.0");
			socket=new MulticastSocket(port);
			socket.joinGroup(group);
			
		} catch (Exception e) {
			
		}
		setBounds(100,50,360,380);
		setVisible(true);
		
	}
	public void run(){								//重写线程run函数
		while(true){	
			byte data[]=new byte[1024];					//数据接收的大小	
			DatagramPacket packet=null;					//一个数据包对象
			packet=new DatagramPacket(data,data.length,group,port);		//连接
			try {	
				socket.receive(packet);					//接受数据包
				String message=new String(packet.getData(),0,packet.getLength());//数据下载成String格式
				inceAr.setText("正在接收的内容\n"+message);
				inced.append(message+'\n');
			} catch (Exception e) {
				
			}
			if(b==true){
				break;
			}
		}
	}
	public void actionPerformed(ActionEvent e){				//对于窗口内的各个单击事件的处理
		if(e.getSource()==ince){
			ince.setBackground(Color.red);
			stop.setBackground(Color.yellow);
			if(!(thread.isAlive())){
				thread=new Thread(this);
			}
			thread.start();
			b=false;
		}
		if(e.getSource()==stop){
			ince.setBackground(Color.yellow);
			stop.setBackground(Color.red);
			b=true;
		}
	}
	public static void main(String[] args) {					//主函数创建实例
		Receive receive=new Receive();
		receive.setSize(480,200);

	}

}

主机运行时客户端运行效果截图：

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