如何从单个套接字连续发送和接收数据报包。

Question

I want to send and receive datagrampacket from same port. Same socket should be used to send packets and receive packets. If i send it then it can not receive incoming packets at the same time. How to synch send and receive packets from single port?

Answer 1

You could try something as the following:

    DatagramSocket serverSocket = new DatagramSocket(9876);             
    byte[] receiveData = new byte[1024];             
    byte[] sendData = new byte[1024]; 

    //receiving:
    DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
    serverSocket.receive(receivePacket);

    InetAddress callerIPAddress = receivePacket.getAddress();                   
    int callerPort = receivePacket.getPort();

    //sending:  
    sendData = "ciao".getBytes();
    DatagramPacket sendPacket =  new DatagramPacket(sendData, sendData.length, callerIPAddress, callerPort);
    serverSocket.send(sendPacket);