How can i check System IP Address/Host Name in Java?

Question

is there any way to find out system IP Address without using external process? I want to grab this information for my application but in pure java if possible.

Answer 1

Does this meet your needs?

import java.net.*;
import java.io.*;
import java.applet.*;

public class GetClientIP extends Applet {
  public void init() {
    try {
     InetAddress thisIp =
        InetAddress.getLocalHost();
     System.out.println("IP:"+thisIp.getHostAddress());
     }
    catch(Exception e) {
     e.printStackTrace();
     }
    }
}

Answer 2

The InetAddress.getLocalHost().getHostAddress() call doesn't always work; sometimes it returns 127.0.0.1.

See java InetAddress.getLocalHost(); returns 127.0.0.1 ... how to get REAL IP? for some more details and other options.

Answer 3

If you want to find ip address in java application

 InetAddress localIP=InetAddress.getLocalHost();

and if you are using web application

  request.getRemoteAddr();

Answer 4

看看InetAddress http://download.oracle.com/javase/1.4.2/docs/api/java/net/InetAddress.html

Answer 5

Hi yes its possible with the class InetAddres. Check this link JAVA API and the method you need is getHostAddress()

Answer 6

考虑使用NetworkInterface类。