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();
}
}

}