?? multicastsockettest.java
字號:
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;
/**
* Description:
* <br/>Copyright (C), 2008-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
//讓該類實現Runnable接口,該類的實例可作為線程的target
public class MulticastSocketTest implements Runnable
{
//使用常量作為本程序的多點廣播IP地址
private static final String BROADCAST_IP
= "230.0.0.1";
//使用常量作為本程序的多點廣播目的的端口
public static final int BROADCAST_PORT = 30000;
//定義每個數據報的最大大小為4K
private static final int DATA_LEN = 4096;
//定義本程序的MulticastSocket實例
private MulticastSocket socket = null;
private InetAddress broadcastAddress = null;
private Scanner scan = null;
//定義接收網絡數據的字節數組
byte[] inBuff = new byte[DATA_LEN];
//以指定字節數組創建準備接受數據的DatagramPacket對象
private DatagramPacket inPacket =
new DatagramPacket(inBuff , inBuff.length);
//定義一個用于發送的DatagramPacket對象
private DatagramPacket outPacket = null;
public void init()throws IOException
{
try
{
//創建用于發送、接收數據的MulticastSocket對象
//因為該MulticastSocket對象需要接收,所以有指定端口
socket = new MulticastSocket(BROADCAST_PORT);
broadcastAddress = InetAddress.getByName(BROADCAST_IP);
//將該socket加入指定的多點廣播地址
socket.joinGroup(broadcastAddress);
//設置本MulticastSocket發送的數據報被回送到自身
socket.setLoopbackMode(false);
//初始化發送用的DatagramSocket,它包含一個長度為0的字節數組
outPacket = new DatagramPacket(new byte[0] , 0 ,
broadcastAddress , BROADCAST_PORT);
//啟動以本實例的run()方法作為線程體的線程
new Thread(this).start();
//創建鍵盤輸入流
scan = new Scanner(System.in);
//不斷讀取鍵盤輸入
while(scan.hasNextLine())
{
//將鍵盤輸入的一行字符串轉換字節數組
byte[] buff = scan.nextLine().getBytes();
//設置發送用的DatagramPacket里的字節數據
outPacket.setData(buff);
//發送數據報
socket.send(outPacket);
}
}
finally
{
socket.close();
}
}
public void run()
{
try
{
while(true)
{
//讀取Socket中的數據,讀到的數據放在inPacket所封裝的字節數組里。
socket.receive(inPacket);
//打印輸出從socket中讀取的內容
System.out.println("聊天信息:" + new String(inBuff , 0 ,
inPacket.getLength()));
}
}
//捕捉異常
catch (IOException ex)
{
ex.printStackTrace();
try
{
if (socket != null)
{
//讓該Socket離開該多點IP廣播地址
socket.leaveGroup(broadcastAddress);
//關閉該Socket對象
socket.close();
}
System.exit(1);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
public static void main(String[] args)
throws IOException
{
new MulticastSocketTest().init();
}
}
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