How does udp socket implement data transmission?

Introduction to UDP

UDP: Short for User Datagram Protocol, Chinese name is User Data Packet Protocol, a connectionless transport layer protocol in OSI Reference Model, which provides transaction-oriented simple and unreliable information transfer service.

Features: Complete address information is given in each datagram, so there is no need to establish a connection between the sender and the receiver.

UDP transfers data with a size limit, and each transmitted datagram must be limited to 64KB.

UDP is an unreliable protocol, and the datagrams sent by the sender do not necessarily arrive at the receiver in the same order.

Udp socket for data transmission

Socket programming implements UDP data transfer based on DatagramSocket and DatagramPacketAPI implementation.

[java] view plain copy

[java] view plain copyimport java.io.IOExcepTIon;

Import java.net.DatagramPacket;

Import java.net.DatagramSocket;

Import java.net.InetAddress;

/**

* Client sends data

Public class UdpClient {

Public staTIc void main(String[] args) throws IOExcepTIon {

/ / 1. Define the server's address, port number, data

Byte[] data = "udpclient send data".getBytes();

InetAddress address = InetAddress.getByName("localhost");

Int port = 8086;

// 2. Create a datagram containing the data information sent

DatagramPacket packet = new DatagramPacket(data, data.length, address,port);

// 3. Create a DatagramSocket object

DatagramSocket socket = new DatagramSocket();

// 4. Send a datagram to the server

Socket.send(packet);

Socket.close();

}

[java] view plain copyimport java.io.IOExcepTIon;

Import java.net.DatagramPacket;

Import java.net.DatagramSocket;

/**

*Server receives data

Public class UdpServer {

Public static void main(String[] args) throws IOException {

DatagramSocket socket = new DatagramSocket(8086);

Byte[] data = new byte[1024];

DatagramPacket packet = new DatagramPacket(data, data.length);

Socket.receive(packet);

String info = new String(data, 0, packet.getLength());

System.out.println("udpservice receiving data is" + info);

Socket.close();

}

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