static String printSocket(DatagramSocket socket) {
return "[Socket: localPort="
+ socket.getLocalPort()
+ ", remoteAddr="
+ socket.getInetAddress()
+ ", localAddr="
+ socket.getLocalAddress()
+ "]";
}
public static void main(String[] args) throws Exception {
DatagramChannel dc = DatagramChannel.open();
DatagramSocket socket = dc.socket();
socket.bind(new InetSocketAddress(22500));
ByteBuffer byteBuf = ByteBuffer.allocate(8);
// byteBuf.order(ByteOrder.LITTLE_ENDIAN);
LongBuffer longBuf = byteBuf.asLongBuffer();
while (true) {
dc.receive(byteBuf);
System.out.println(longBuf.get(0));
byteBuf.clear();
}
}
public static void main(String args[]) throws Exception {
final int ENOUGH_SIZE = 1024;
final int SMALL_SIZE = 4;
boolean isBlocked = true;
int size = ENOUGH_SIZE;
if (args.length > 0) {
int opt = Integer.parseInt(args[0]);
switch (opt) {
case 1:
isBlocked = true;
size = ENOUGH_SIZE;
break;
case 2:
isBlocked = true;
size = SMALL_SIZE;
break;
case 3:
isBlocked = false;
size = ENOUGH_SIZE;
break;
case 4:
isBlocked = false;
size = SMALL_SIZE;
break;
}
}
DatagramChannel channel = DatagramChannel.open();
channel.configureBlocking(isBlocked);
ByteBuffer buffer = ByteBuffer.allocate(size);
DatagramSocket socket = channel.socket();
SocketAddress localAddr = new InetSocketAddress(8000);
socket.bind(localAddr);
while (true) {
System.out.println("开始接收数据报");
SocketAddress remoteAddr = channel.receive(buffer);
if (remoteAddr == null) {
System.out.println("没有接收到数据报");
} else {
buffer.flip();
System.out.println("接收到的数据报的大小为" + buffer.remaining());
}
Thread.sleep(500);
}
}
