向DatagramSocket添加超时 – receive()

我需要在这段代码上创建一个10秒的超时

DatagramPacket getack = new DatagramPacket(incoming,incoming.length);
socket.receive(getack);

我需要它列出10s的传入数据包,如果它在10s之前收到一个数据包它将跳过if语句,如果它达到10s它将跳转到else并重新发送数据包。 这是可能的,我怎么能这样做,我对此很新。

private static void sendDATA() { outgoing = new byte[512]; // Empty array try { ByteBuffer sDATA = ByteBuffer.allocate(516); // 512 - 2 byte opcode, 2 byte block #, 512 data DatagramPacket data = new DatagramPacket(outgoing, outgoing.length, InetAddress.getByName(clientip), clientport); InputStream fis = new FileInputStream(new File(FILE)); int a; int block = 1; while((a = fis.read(outgoing,0,512)) != -1) { data.setLength(a); sDATA.put((byte)3); sDATA.put((byte)block); sDATA.put(outgoing); socket.send(data); while(true) { DatagramPacket getack = new DatagramPacket(incoming, incoming.length); socket.receive(getack); if(incoming[0] == 3 && incoming[1] == block) { break; } else { socket.send(data); } } } } catch (Exception e) { } } 

这应该适用于你的例子。

 socket.setSoTimeout(10000); while(true) { DatagramPacket getack = new DatagramPacket(incoming, incoming.length); try { socket.receive(getack); } catch (SocketTimeoutException e) { // resend socket.send(data); continue; } // check received data... } 
 socket.setSoTimeout(10000); socket.receive(getack); socket.setSoTimeout(0);