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Thread: How to get your computer name and IP address?

  1. #1
    mmm.. coffee JavaPF's Avatar
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    Post How to get your computer name and IP address?

    This code will print your workstations name and IP address:

    public class NetInfo {
         public static void main(String[] args) {
            new NetInfo().say();
            }
     
         public void say() {
           try {
           java.net.InetAddress i = java.net.InetAddress.getLocalHost();
           System.out.println(i);                  // name and IP address
           System.out.println(i.getHostName());    // name
           System.out.println(i.getHostAddress()); // IP address only
           }
           catch(Exception e){e.printStackTrace();}
         }
        }
    Sample output:

    homepc/10.210.65.8
    homepc
    10.210.65.8

    This code will list the interfaces available on a workstation:

    import java.net.*;
    import java.util.*;
    import java.io.*;
    import java.nio.*;
     
    public class IPAddress {
     public void  getInterfaces (){
          try {
             Enumeration e = NetworkInterface.getNetworkInterfaces();
     
             while(e.hasMoreElements()) {
                NetworkInterface ni = (NetworkInterface) e.nextElement();
                System.out.println("Net interface: "+ni.getName());
     
                Enumeration e2 = ni.getInetAddresses();
     
                while (e2.hasMoreElements()){
                   InetAddress ip = (InetAddress) e2.nextElement();
                   System.out.println("IP address: "+ ip.toString());
                }
             }
          }
          catch (Exception e) {
             e.printStackTrace();
          }
       }
     
       public static void main(String[] args) {
        IPAddress ip = new IPAddress();
        ip.getInterfaces();
       }
    }
    Sample output:

    Net interface: lo
    IP address: /127.0.0.1
    Net interface: eth0
    IP address: /10.210.62.4
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  2. The Following 4 Users Say Thank You to JavaPF For This Useful Post:

    JanLW (January 30th, 2014), javapenguin (January 14th, 2011), Json (July 9th, 2009), sainathdi (January 18th, 2013)


  3. #2
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    Default Re: How to Get your computers name and IP address

    Yea rite.Tanks

  4. #3
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    Default Re: How to Get your computers name and IP address

    wow cool,, tnx 4 thiz!!

  5. #4
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    Default Re: How to Get your computers name and IP address

    Awesome tutorial. This is very useful. I have one newbie question. I can get it to run inside of Netbeans no prob but it wont run as a standalone. Is there a command to make it so you can have it pop up via cmd in windows?

  6. #5
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    Default Re: How to Get your computers name and IP address

    Use the default command for running a java program via command-line. Note that you will need to pass both class files to the jvm. Alternatively, you can set the classpath.

    java IPAddress CLASSPATH=%THE_PATH%
    rem the path is the path(s) of the class files. Only one path is required if they're both in the same folder

  7. The Following 2 Users Say Thank You to helloworld922 For This Useful Post:

    Keiyentai (August 8th, 2010), Seiko09 (December 8th, 2011)

  8. #6
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    Default Re: How to Get your computers name and IP address

    Thank you

  9. #7
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    Default Re: How to Get your computers name and IP address

    Thank you

  10. #8
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    Default Re: How to Get your computers name and IP address

    Thank you it was very usefull

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