通过 UDP 数据包从 matlab 发送 double 到 java

Sending double from matlab to java via UDP-packets

我正在尝试将双打从 Matlab(Simulink) 发送到 java。 这是我的代码:

 public static void main(String[] args) throws SocketException, UnknownHostException, IOException {

DatagramSocket socket = new DatagramSocket(25000);
byte[] buf = new byte[512];
DatagramPacket packet = new DatagramPacket(buf, buf.length);

while (true) {
   socket.receive(packet);
   String msg = new String(buf, 0, packet.getLength());
   Double x = ByteBuffer.wrap(buf).getDouble();
   System.out.println(x);
   packet.setLength(buf.length);
      }
 }

我正在获取值,但它们确实没有意义...

很可能您将 double 发送为小端,但 ByteBuffer 假定 "network order" 为大端。

尝试

DatagramSocket socket = new DatagramSocket(25000);
byte[] buf = new byte[512];
DatagramPacket packet = new DatagramPacket(buf, buf.length);
DoubleBuffer db = ByteBuffer.wrap(buf).order(ByteOrder.LITTLE_ENDIAN).asDoubleBuffer();

while (true) {
    socket.receive(packet);
    db.limit(packet.getLength() / Double.BYTES);
    double x = db.get(0);
    System.out.println(x);
}

注意:UCP 是有损的,因此会丢失一些数据包。