Java 如何从UDP广播接收多个响应
我有一个案例，我需要在特定端口上的wifi中发送广播和UDP请求，我正在呼叫的特定设备应返回一些信息，以便我可以确定它们在该网络中的数量。 到目前为止，我有：Java 如何从UDP广播接收多个响应,java,android,sockets,udp,Java,Android,Sockets,Udp,我有一个案例，我需要在特定端口上的wifi中发送广播和UDP请求，我正在呼叫的特定设备应返回一些信息，以便我可以确定它们在该网络中的数量。 到目前为止，我有： public class UDP extends AsyncTask<Void, Void, String> { @Override protected String doInBackground(Void... voids) { String text = ""; int s
public class UDP extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... voids) {
String text = "";
int server_port = 7432;
DatagramPacket receivePacket = null;
DatagramSocket clientSocket = null;
try {
clientSocket = new DatagramSocket();
clientSocket.setSoTimeout(5);
InetAddress IPAddress = InetAddress.getByName("255.255.255.255");
byte[] sendData = ("02904").getBytes();
byte[] receiveData = new byte[12];
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, server_port);
clientSocket.send(sendPacket);
receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
Log.e("Receiving response", "Response");
text = new String(receivePacket.getData());
clientSocket.close();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e) {
Log.e("Receiving response", "Response");
assert receivePacket != null;
text = new String(receivePacket.getData());
clientSocket.close();
} catch (IOException e) {
Log.e("Receiving response", "Response");
assert receivePacket != null;
text = new String(receivePacket.getData());
clientSocket.close();
}
return text;
}
@Override
protected void onPostExecute(String s) {
Log.e("Socket response", s);
}
}
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