能不能用Socket类来实现广播，怎么实现发送和接收

[huaton1983]

如果不能用Socket来实现，又没有其他比较简便的方法

[JavaBoyCaoJi]

帮你up

[Keepers]

public void join(String groupName, int port) {
try {
MulticastSocket msocket = new MulticastSocket(port);
group = InetAddress.getByName(groupName);
msocket.joinGroup(group);
} catch (IOException e) {
}
}


e154. Receiving from a Multicast Group
Once you've created a multicast socket and joined the group, all datagrams sent to its corresponding multicast address will be available to be read from the socket. You can read from the socket just like you would from a unicast socket.
public void read(MulticastSocket msocket, byte[] inbuf) {
try {
DatagramPacket packet = new DatagramPacket(inbuf, inbuf.length);

// Wait for packet
msocket.receive(packet);

// Data is now in inbuf
int numBytesReceived = packet.getLength();
} catch (IOException e) {
}
}

e155. Sending to a Multicast Group
You can send to a multicast socket using either a DatagramSocket or a MulticastSocket. What makes it multicast is the address that is in the datagram. If the address is a multicast address, the datagram will reach the multicast members in the group. You only need to use MulticastSocket if you want to control the time-to-live of the datagram.
byte[] outbuf = new byte[1024];
int port = 1234;
try {
DatagramSocket socket = new DatagramSocket();
InetAddress groupAddr = InetAddress.getByName("228.1.2.3");
DatagramPacket packet = new DatagramPacket(outbuf, outbuf.length, groupAddr, port);
socket.send(packet);
} catch (SocketException e) {
} catch (IOException e) {
}

[wyhgg]

up

[Iforgot]

为什么不用局域网探测方式呢？ 不就是255个IP地址吗？

[mingjob]

up

[jokerjava]

up

[xudaorong]

用Socket应该可以实现
就像Iforgot(清风雨)说得检测局域网IP，得到IP和PORT后，进行交互。
通过UDP（数据报）来接受和发送。