// multSocketClient.java
import java.io.*;
import java.net.*;
class multSocketClient {
  public static void main(String[] args) throws IOException {
    //在端口12345上創(chuàng)建MulticastSocket對象,接收多播數(shù)據(jù)包
    MulticastSocket ms = new MulticastSocket(12345);
    InetAddress group = InetAddress.getByName("224.0.0.1");    
    ms.joinGroup(group);//加入多播組
    for (int i = 0; i < 5; i++) {//限制循環(huán)次數(shù),只接收5次
      byte[] buf1 = new byte[256];
      //對象不需要地址信息，因?yàn)樘捉幼忠寻刂?      DatagramPacket dgp = new DatagramPacket(buf1, buf1.length);      
      ms.receive(dgp);//接收數(shù)據(jù)包
      byte[] buf2 = new byte[dgp.getLength()];
      //將數(shù)據(jù)復(fù)制到字節(jié)數(shù)組中并輸出到屏幕
      System.arraycopy(dgp.getData(), 0, buf2, 0, dgp.getLength());
      System.out.println(new String(buf2));
    }    
    ms.leaveGroup(group);//退出多播組    
    ms.close();//關(guān)閉套接字
  }
}