Clase java.net.InetAddress en Java

clase pública InetAddress extiende Object implementa Serializable:

La clase java.net.InetAddress proporciona métodos para obtener la dirección IP de cualquier nombre de host. Una dirección IP está representada por un número sin signo de 32 o 128 bits. InetAddress puede manejar direcciones IPv4 e IPv6. 

Hay 2 tipos de direcciones:

1. Unidifusión: un identificador para una única interfaz.
2. Multidifusión: un identificador para un conjunto de interfaces.

InetAddress – Métodos de fábrica:

La clase InetAddress se usa para encapsular tanto la dirección IP numérica como el nombre de dominio para esa dirección. La clase InetAddress no tiene constructores visibles. La clase InetAddress tiene la incapacidad de crear objetos directamente, por lo tanto, los métodos de fábrica se utilizan para este propósito. Los métodos de fábrica son métodos estáticos en una clase que devuelven un objeto de esa clase.

Hay 5 métodos de fábrica disponibles en la clase InetAddress: 

A continuación se muestra la implementación de Java de la clase InetAddress para demostrar el uso de métodos de fábrica: 

import java.io.*;
import java.net.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
        throws UnknownHostException
    {
        // To get and print InetAddress of Local Host
        InetAddress address1 = InetAddress.getLocalHost();
        System.out.println("InetAddress of Local Host : "
                           + address1);
  
        // To get and print InetAddress of Named Host
        InetAddress address2
            = InetAddress.getByName("45.22.30.39");
        System.out.println("InetAddress of Named Host : "
                           + address2);
  
        // To get and print ALL InetAddresses of Named Host
        InetAddress address3[]
            = InetAddress.getAllByName("172.19.25.29");
        for (int i = 0; i < address3.length; i++) {
            System.out.println(
                "ALL InetAddresses of Named Host : "
                + address3[i]);
        }
  
        // To get and print InetAddresses of
        // Host with specified IP Address
        byte IPAddress[] = { 125, 0, 0, 1 };
        InetAddress address4
            = InetAddress.getByAddress(IPAddress);
        System.out.println(
            "InetAddresses of Host with specified IP Address : "
            + address4);
  
        // To get and print InetAddresses of Host
        // with specified IP Address and hostname
        byte[] IPAddress2
            = { 105, 22, (byte)223, (byte)186 };
        InetAddress address5 = InetAddress.getByAddress(
            "gfg.com", IPAddress2);
        System.out.println(
            "InetAddresses of Host with specified IP Address and hostname : "
            + address5);
    }
}

InetAddress of Local Host : localhost/127.0.0.1
InetAddress of Named Host : /45.22.30.39
ALL InetAddresses of Named Host : /172.19.25.29
InetAddresses of Host with specified IP Address : /125.0.0.1
InetAddresses of Host with specified IP Address and hostname : gfg.com/105.22.223.186

InetAddress — Métodos de instancia:

La clase InetAddress tiene muchos métodos de instancia que se pueden llamar usando el objeto. Los métodos de instancia son: 

A continuación se muestra la implementación de Java de la clase InetAddress para demostrar el uso de métodos de instancia: 

import java.io.*;
import java.net.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
        throws UnknownHostException
    {
  
        InetAddress address1
            = InetAddress.getByName("45.22.30.39");
        InetAddress address2
            = InetAddress.getByName("45.22.30.39");
        InetAddress address3
            = InetAddress.getByName("172.19.25.29");
  
        // true, as clearly seen above
        System.out.println(
            "Is Address-1 equals to Address-2? : "
            + address1.equals(address2));
        // false
        System.out.println(
            "Is Address-1 equals to Address-3? : "
            + address1.equals(address3));
  
        // returns IP address
        System.out.println("IP Address : "
                           + address1.getHostAddress());
        // returns host name,
        // which is same as IP
        // address in this case
        System.out.println(
            "Host Name for this IP Address : "
            + address1.getHostName());
  
        // returns address in bytes
        System.out.println("IP Address in bytes : "
                           + address1.getAddress());
  
        // false, as the given site
        //  has only one server
        System.out.println("Is this Address Multicast? : "
                           + address1.isMulticastAddress());
  
        System.out.println("Address in string form : "
                           + address1.toString());
  
        // returns fully qualified
        // domain name for this IP address.
        System.out.println(
            "Fully qualified domain name for this IP address : "
            + address1.getCanonicalHostName());
  
        // hashcode for this IP address.
        System.out.println("Hashcode for this IP address : "
                           + address1.hashCode());
  
        // to check if the InetAddress is
        // an unpredictable address..
        System.out.println(
            "Is the InetAddress an unpredictable address? : "
            + address1.isAnyLocalAddress());
    }
}

Is Address-1 equals to Address-2? : true
Is Address-1 equals to Address-3? : false
IP Address : 45.22.30.39
Host Name for this IP Address : 45.22.30.39
IP Address in bytes : [B@579bb367
Is this Address Multicast? : false
Address in string form : 45.22.30.39/45.22.30.39
Fully qualified domain name for this IP address : 45.22.30.39
Hashcode for this IP address : 756424231
Is the InetAddress an unpredictable address? : false