Creating InetAddress object in Java

Question

I am trying to convert an address specified by an IP number or a name  both in String  i e  localhost or 127 0 0 1   into an InetAdress object  There s no constructor but rather static methods that return an InetAddress  So if I get a host name it s not a problem  but what if I get the IP number  There s one method that gets byte   but I m not sure how that can help me  All other methods gets the host name   InetAddress API documentation

User · Answer

This is a project for getting IP address of any website   it s usefull and so easy to make   import java net InetAddress  import java net UnkownHostExceptiin   public class Main      public static void main String  args           try              InetAddress addr   InetAddresd getByName  www yahoo com                System out println addr getHostAddress                 catch UnknownHostException e                e printStrackTrace

User · Answer

InetAddress class can be used to store IP addresses in IPv4 as well as IPv6 formats  You can store the IP address to the object using either InetAddress getByName   or InetAddress getByAddress   methods  In the following code snippet  I am using InetAddress getByName   method to store IPv4 and IPv6 addresses  InetAddress IPv4   InetAddress getByName  quot 127 0 0 1 quot    InetAddress IPv6   InetAddress getByName  quot 2001 db8 3333 4444 5555 6666 1 2 3 4 quot     You can also use InetAddress getByAddress   to create object by providing the byte array  InetAddress addr   InetAddress getByAddress new byte   127  0  0  1     Furthermore  you can use InetAddress getLoopbackAddress   to get the local address and InetAddress getLocalHost   to get the address registered with the machine name  InetAddress loopback   InetAddress getLoopbackAddress       output  localhost 127 0 0 1 InetAddress local   InetAddress getLocalHost       output   lt machine-name gt   lt ip address on network gt   Note- make sure to surround your code by try catch because InetAddress methods return  java net UnknownHostException

User · Answer

From the API for InetAddress     The host name can either be a machine   name  such as  java sun com   or a   textual representation of its IP   address  If a literal IP address is   supplied  only the validity of the   address format is checked

User · Answer

You should be able to use getByName or getByAddress      The host name can either be a machine   name  such as  java sun com   or a   textual representation of its IP   address   InetAddress addr   InetAddress getByName  127 0 0 1      The method that takes a byte array can be used like this   byte   ipAddr   new byte   127  0  0  1   InetAddress addr   InetAddress getByAddress ipAddr

User · Answer

InetAddress getByName also works for ip address   From the JavaDoc     The host name can either be a machine   name  such as  java sun com   or a   textual representation of its IP   address  If a literal IP address is   supplied  only the validity of the   address format is checked

User · Answer

ip   InetAddress getByAddress new byte              byte 192   byte 168   byte 0   byte 102

User · Answer

The api is fairly easy to use       Lookup the dns  if the ip exists   if   ip isEmpty           InetAddress inetAddress   InetAddress getByName ip        dns   inetAddress getCanonicalHostName

[java] Creating InetAddress object in Java

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