IP 주소를 나타내는 클래스, InetAddress

InetAddress
네트워크상의 호스트에 대한 IP 주소를 나타내는 클래스.

 

byte[] getAddress()
InetAddress의 IP 주소를 byte 배열로 반환

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("www.example.com");
            byte[] ipAddress = address.getAddress();
            for (byte b : ipAddress) {
                System.out.print((b & 0xFF) + ".");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 
[출력결과]
93.184.216.34.

 

 

static InetAddress[] getAllByName(String host)
주어진 호스트 이름에 대한 모든 IP 주소를 반환 

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress[] addresses = InetAddress.getAllByName("www.google.com");
            for (InetAddress addr : addresses) {
                System.out.println(addr);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
www.google.com/172.217.3.100
www.google.com/2607:f8b0:4026:805::2004

 

 

 

static InetAddress getByAddress(byte[] addr)
주어진 IP 주소에 대한 InetAddress를 반환 

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            byte[] ipAddress = {93, (byte)184, (byte)216, 34};
            InetAddress address = InetAddress.getByAddress(ipAddress);
            System.out.println(address);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
/93.184.216.34

 

 

static InetAddress getByName(String host)
주어진 호스트 이름에 대한 InetAddress를 반환 

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("www.example.com");
            System.out.println(address);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
www.example.com/93.184.216.34

 

 

 

String getCanonicalHostName()
InetAddress의 정규화된 호스트 이름을 반환 

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("www.google.com");
            System.out.println(address.getCanonicalHostName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
lga25s76-in-x04.1e100.net

 

 

String getHostAddress()
InetAddress의 IP 주소를 문자열로 반환

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("www.example.com");
            System.out.println(address.getHostAddress());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
93.184.216.34

 

 

 

String getHostName()
InetAddress의 호스트 이름을 반환

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("93.184.216.34");
            System.out.println(address.getHostName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
www.example.com

 

 

 

 

static InetAddress getLocalHost()
로컬 호스트의 InetAddress를 반환

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getLocalHost();
            System.out.println(address);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
hostname/127.0.1.1

 

 

 

boolean isMulticastAddress()
InetAddress가 멀티캐스트 주소인지 여부를 반환

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("224.0.0.1");
            System.out.println(address.isMulticastAddress());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
true

 

https://standout.tistory.com/1518

동영상 회의에 사용되는 특별한 IP 주소: 멀티캐스트 주소

 

boolean isLoopbackAddress()
InetAddress가 루프백 주소인지 여부를 반환 

import java.net.*;

public class InetAddressExample {
    public static void main(String[] args) {
        try {
            InetAddress address = InetAddress.getByName("127.0.0.1");
            System.out.println(address.isLoopbackAddress());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

[출력결과]
true

https://standout.tistory.com/1517

루프백 주소, 네트워크에서 자기 자신을 가리키는 특별한 주소