Java back-end development: Using Java Network Interface for API network interface management

Java back-end development has become one of the most popular programming languages ​​in the Internet environment. In Java back-end development, the management of API network interfaces is an important link because it is related to data transmission and interaction between multiple systems. This article will introduce the use of Java Network Interface (JNI for short) and manage API network interfaces in Java back-end development.

1. Overview of Java Network Interface

Java Network Interface is a standard API of Java, used to manage network interfaces, including obtaining network interface information and changing the configuration of network interfaces. In layman's terms, JNI is a network manager in Java, which can be used to control and operate network interfaces.

Using JNI in Java can complete many tasks, such as: obtaining the local IP address, MAC address and other network information; obtaining the basic information of the network interface (interface name, address, status, etc.); implementing the network through JNI Operations such as sending and receiving data packets.

2. Use JNI to manage API network interfaces

In Java back-end development, we often need to share data through APIs, and the network interface is the core of implementing the API network interface. Here we will introduce how to manage network interfaces through JNI.

1. Get the basic information of the network interface

Get the basic information of the network interface, including interface name, IP address, subnet mask, MAC address and other information. The basis of management. The following is an example of obtaining basic information about a network interface:

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class NetworkInterfaceDemo {
    public static void main(String[] args) throws SocketException {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface ni = interfaces.nextElement();
            System.out.printf("Name: %s
", ni.getName());
            System.out.printf("Display name: %s
", ni.getDisplayName());
            Enumeration<InetAddress> inetAddresses = ni.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress inetAddress = inetAddresses.nextElement();
                System.out.printf("InetAddress: %s
", inetAddress);
            }
            byte[] hardwareAddress = ni.getHardwareAddress();
            if (hardwareAddress != null) {
                System.out.print("MAC address: ");
                for (byte b : hardwareAddress) {
                    System.out.printf("%02X ", b);
                }
                System.out.println();
            }
        }
    }
}

Running this program will output all the network interfaces of the machine, including their names, display names, IP addresses, MAC addresses and other information.

2. Sending and receiving network data packets through JNI

When implementing the API network interface, it is often necessary to transmit and interact with data through network data packets. JNI provides us with an interface for sending and receiving network data packets. The following is a simple example of implementing UDP protocol to send and receive network data packets:

import java.net.*;

public class UDPClientDemo {
    public static void main(String[] args) throws Exception {
        DatagramSocket client = new DatagramSocket();
        String message = "Hello, UDP!";
        byte[] sendBytes = message.getBytes("UTF-8");
        DatagramPacket sendPacket = new DatagramPacket(sendBytes, sendBytes.length,
                InetAddress.getByName("127.0.0.1"), 8888);
        client.send(sendPacket);
        byte[] receiveBytes = new byte[1024];
        DatagramPacket receivePacket = new DatagramPacket(receiveBytes, receiveBytes.length);
        client.receive(receivePacket);
        String receiveMessage = new String(receivePacket.getData(), 0, receivePacket.getLength(), "UTF-8");
        System.out.println("Message from server: " + receiveMessage);
        client.close();
    }
}

This sample program first creates a DatagramSocket object, which represents a UDP protocol socket. Then the data packet to be sent and the data packet to be received are specified through the DatagramPacket object. Finally, the send() and receive() methods are used to complete the sending and receiving of data packets respectively, realizing the network data packet transmission operation of the UDP protocol.

Conclusion

Java Network Interface is an important network management API in Java. It can help us manage network interfaces, obtain network information, and send and receive network data packets. In Java back-end development, the management of API network interfaces is an essential link, and JNI is the key to achieving this work. By mastering the use of JNI, we can manage network interfaces and implement API network interface operations more efficiently and conveniently.

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