java udp检测数据包损坏

Question

如何检测 java 中的 udp 数据包损坏？

public class PacketReceiver implements Runnable{
byte[] dataReceive = new byte[udpConnectionManager.MAX_PACKET_SIZE];
private ArrayList<Thread> workerList = new ArrayList<Thread>();
@Override
public void run() {
    while(true){
        DatagramPacket receivePacket = new DatagramPacket(dataReceive, dataReceive.length);
        try {
            udpConnectionManager.socket.receive(receivePacket);
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] receivedData = receivePacket.getData();
        //[0] stores basic command
        //[1~4] int stores protocol id
        //[5~9] int data increase counter for detect packet loss
        //[10~14] 
        switch(receivedData[0]){
        //initial packet
        case 0x01:
            if(!udpConnectionManager.instance.isInitialized(receivePacket)){
                Thread t = new Thread(new AcceptThread(receivePacket));
                t.start();
                workerList.add(t);
            }else{
                System.out.println("initialized packet attempt to initialize.");
            }
        //heartbeat signal
        case 0x02:
            if(udpConnectionManager.instance.isInitialized(receivePacket)){
                udpConnectionManager.instance.getConnection(receivePacket).onHeartBeat();
            }else{
                System.out.println("Received HeartBeat signal from non-initialized connection");
            }
        //
        case 0x03:

        }
    }
}

}

可能会发生数据包损坏。我如何使用 udp 处理数据包损坏问题？我知道如何检测数据包丢失，但我不知道如何检测数据包损坏。

Answer 1

如果您绝对需要仅使用 DatagramPacket - 那么，它不会公开任何 api 来查询传输的校验和。您可以实现的解决方案是使用逻辑(SHA256、MD..)来计算校验和，将校验和作为交替 UDP 数据包中的有效负载传输，并将数据有效负载计算的校验和与下一个接收到的校验和进行比较UDP 段。当然，您需要在建议的解决方案中处理更多的错误情况。