组播问题，怎么收不到信息啊！

yutao132

服务器端：
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public
class Server
{
public static void main(String [] arstring)
{
try
{       

System.out.println("im the server");

MulticastSocket multicastSocket = new MulticastSocket(7777);

InetAddress inetAddress = InetAddress.getByName("230.0.0.1");

multicastSocket.joinGroup(inetAddress);


while (true)
{
byte [] arb = new byte [1000];

DatagramPacket datagramPacket = new DatagramPacket(arb, arb.length);

multicastSocket.receive(datagramPacket);


System.out.println(new String(arb));
}
}
catch (Exception exception)
{
exception.printStackTrace();
}
}
}

客户端
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;

public
class Client
{
public static void main(String [] arstring)
{System.out.println("im the client..");
try
{

byte [] arb = new byte [] {'h','e','l','l','o'};

InetAddress inetAddress = InetAddress.getByName("230.0.0.1");

DatagramPacket datagramPacket = new DatagramPacket(arb, arb.length, inetAddress, 7777);

MulticastSocket multicastSocket = new MulticastSocket();

multicastSocket.joinGroup(inetAddress);

multicastSocket.send(datagramPacket);

System.out.println("send ok");

multicastSocket.close();
}
catch (Exception exception)
{
exception.printStackTrace();
}
}
}

huanggaoshan

我用本地地址测试没有问题,可以收到信息的

InetAddress inetAddress = InetAddress.getByName("224.0.0.1");

你要注意,先运行服务器,然后让客户端发送信息

r111ddb

应该是发送时要给个结束符，不然容易造成溢出