Java java.net.InetAddress用法及代碼示例

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);
    }
}

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());
    }
}