Bittorrent UDP tracker protocol JAVA test

```
InetSocketAddress server_addr = new InetSocketAddress(InetAddress.getByName("tracker.torrent.eu.org").getHostAddress(), 451);
DatagramSocket socket = new DatagramSocket();

//connect
String hexData = "00000417271019800000000000000001";
byte[] buf = Util.convertHexStringToByteNoSpace(hexData);
DatagramPacket sendPacket = new DatagramPacket(buf, 0, buf.length, server_addr);
socket.send(sendPacket);

byte[] recvBuf = new byte[2048];
DatagramPacket recvPacket = new DatagramPacket(recvBuf, 2048);
socket.receive(recvPacket);
System.out.println(Util.convertByteToHexStringWithoutSpace(recvPacket.getData()));
byte[] connection_id = new byte[8];
System.arraycopy(recvPacket.getData(), 8, connection_id, 0, 8);
System.out.println("connection_id：" + Util.convertByteToHexStringWithoutSpace(connection_id));

//announce
ByteBuffer byteBuffer = ByteBuffer.allocate(98);
byteBuffer.put(connection_id);	//connection id
byteBuffer.putInt(1);			//action: announce
byteBuffer.putInt(2);			//transaction id(Randomized by client)
byteBuffer.put(Util.convertHexStringToByteNoSpace("81eecacb7dca9fcd8dbfd4baf9c92de27d0e4c20"));	//info hash
byteBuffer.put(Util.convertHexStringToByteNoSpace("81eecacb7dca9fcd8dbfd4baf9c92de27d0e4c20"));	//peer id
byteBuffer.putLong(0);			//downloaded
byteBuffer.putLong(1111110);	//left
byteBuffer.putLong(0);			//uploaded
byteBuffer.putInt(0);
byteBuffer.putInt(0);
byteBuffer.putInt(520);
byteBuffer.putInt(200);
byteBuffer.putShort((short) 6889);

sendPacket = new DatagramPacket(byteBuffer.array(), 0, 98, server_addr);
socket.send(sendPacket);
socket.receive(recvPacket);
System.out.println(Util.convertByteToHexStringWithoutSpace(recvPacket.getData()));
byteBuffer = ByteBuffer.wrap(recvPacket.getData());
byteBuffer.getInt();
byteBuffer.getInt();
byteBuffer.getInt();
byteBuffer.getInt();
int peers = byteBuffer.getInt();
for (int i = 0; i < 200; i++) {
	String ip = Util.longToIp(byteBuffer.getInt());
	byte[] port = new byte[2];
	byteBuffer.get(port);
	System.out.println("peer " + (i + 1) + ": " + ip + ":" + ((0x0000FF00 & (port[0] << 8)) | (0x000000FF & port[1])));
}
```

参考：[https://libtorrent.org/udp_tracker_protocol.html]()

Bittorrent UDP tracker protocol JAVA test

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