Question

我需要在代码的这一部分上创建10秒超时

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

我需要列出10s的传入数据包，如果它在10s之前接收到一个数据包，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) {

    }

}

Answer 1

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...
}

Answer 2

socket.setSoTimeout(10000);
socket.receive(getack);
socket.setSoTimeout(0);

向DatagramSocket添加超时 - receive（）

2 个答案: