java如何获取本机IP

import java.net.*; public class Test6 {     public static void main(String[] args) {        // TODO Auto-generated method stub        InetAddress ia=null;        try {            ia=ia.getLocalHost();                         String localname=ia.getHostName();            String localip=ia.getHostAddress();            System.out.println("本机名称是："+ localname);            System.out.println("本机的ip是 ："+localip);        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    } }