Java:无法接收多播数据 [英] Java: Unable to receive multicast data
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问题描述
我正在尝试测试多播客户端服务器应用程序,但我的客户端无法接收任何数据。我阅读了教程,无法找到任何方法。你能帮助我吗?
I am trying to test a multicast client server application but my client is unable to receive any data. I read through the tutorials and cant find any way. Can you help me out here.
MulticastSocket socket = new MulticastSocket("9000");
socket.setInterface(InetAddress.getLocalHost());
socket.joinGroup("237.0.0.1");
while(true)
{
byte ab[] = new byte[100];
DatagramPacket packet = new DatagramPacket(ab, ab.length);
socket.receive(packet);
System.out.println("Got packet " + Arrays.toString(ab));
}
服务器代码
Server Code
MulticastSocket socket = new MulticastSocket("9000");
socket.setInterface(InetAddress.getLocalHost());
socket.joinGroup("237.0.0.1");
byte index = 0;
while(true)
{
byte[] bt = new byte[100];
Arrays.fill(bt, (byte)index++);
DatagramPacket packet = new DatagramPacket(bt, 100,"237.0.0.1", "9000");
socket.send(packet);
System.out.println("sent 100 bytes");
Thread.sleep(10*1000);
}
我在想这个问题与我设置界面的方式一样。
I am thinking the problem is with the way I am setting the interface.
有人可以帮我解决这个问题,并明白我想要了解的内容。
Could someone help me out here and clear what am I missing to understand.
推荐答案
您的代码无法在我的系统上编译,但是当我执行以下更改(如下)时,它按预期工作:
Your code does not compile on my system, but when I did the following changes (below) it works as expected:
-
端口号应为
int
MulticastSocket socket = new MulticastSocket(9000);
Ip地址应指定为 InetAddress
使用:
InetAddress.getByName("237.0.0.1")
除此之外,请检查您的防火墙是否阻止了流量。
public static void main(String[] args) throws Exception {
final InetAddress group = InetAddress.getByName("237.0.0.1");
final int port = 9000;
new Thread(new Runnable() {
@Override
public void run() {
try {
MulticastSocket socket = new MulticastSocket(port);
socket.setInterface(InetAddress.getLocalHost());
socket.joinGroup(group);
DatagramPacket packet = new DatagramPacket(new byte[100], 100);
while(true) {
socket.receive(packet);
System.out.println("Got packet " +
Arrays.toString(packet.getData()));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
new Thread(new Runnable() {
@Override
public void run() {
try {
MulticastSocket socket = new MulticastSocket(port);
socket.setInterface(InetAddress.getLocalHost());
socket.joinGroup(group);
byte[] bt = new byte[100];
byte index = 0;
while(true) {
Arrays.fill(bt, (byte) index++);
socket.send(new DatagramPacket(bt, 100, group, port));
System.out.println("sent 100 bytes");
Thread.sleep(1*1000);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
输出:
sent 100 bytes
Got packet [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
sent 100 bytes
Got packet [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
sent 100 bytes
Got packet [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]
sent 100 bytes
Got packet [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
sent 100 bytes
Got packet [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4]
sent 100 bytes
Got packet [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5]
sent 100 bytes
Got packet [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6]
^C
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