How to get System IP using Java?

Question

I am trying to create a Java program to retrieve my systems IP address using Java. On the click of a button, the IP address is displayed is a text box.

IP in java using Netbeans

Now the problem is, everytime I use the code

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    try {
        jTextField1.setText(Inet4Address.getLocalHost().toString());
    } catch (UnknownHostException ex) {
        jTextField1.setText("IP not found");
    }
}

It only retrieves my loopback IP and not the static IP which I have configured in Ubuntu which is of the range 192.16x.xxx.xxx This piece of code works fine on my windows 7 but not on Ubuntu 11.04, I dont know why...!!! I dont wanna use windows for developing applications or anything.

Just 2 questions I have

How do I retrieve my systems static IP ?
If java is cross-platform, why does this piece of code works well on windows & not on Ubuntu ?

The picture is in the link https://picasaweb.google.com/110032752637088824628/SystemIPStackoverflow?authkey=Gv1sRgCPTNvLD3qbqRJw#5638314483328453106 — Roshan, Aug 08 '11 at 03:13
See also http://stackoverflow.com/questions/9481865/how-to-get-ip-address-of-our-own-system-using-java — Vadzim, Dec 06 '13 at 06:39

score 7 · Answer 1 · edited May 23 '17 at 12:19

7

Your problem looks very similar to this one in stackoverflow, maybe the answer will help you ;)

edited May 23 '17 at 12:19

Community

1
1

answered Aug 08 '11 at 09:26

Cédric Julien

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yep, link you gave pretty much explains everything there is to know about this. – Aug 08 '11 at 12:16
To summarize that question: A networked computer typically has _multiple_ IP addresses, all of them valid. – Piskvor left the building Aug 08 '11 at 15:25

How to get System IP using Java?

1 Answers1