Java从[请求头]或[其他地方]获取本机ip怎么弄？

如题，我想获取本机ip，在网上找了很多，有的获取了几个ip，有个还获取的个错误的东西：（0:0:0:0:0:0:0）

//获取终端Ip
public static String GetIp() {
InetAddress ia = null;
try {
ia = InetAddress.getLocalHost();
String localip = ia.getHostAddress();
return localip;
} catch (Exception e) {
return null;
}
}

import java.net.InetAddress;
import java.net.UnknownHostException;

public class AA {

/**
 * @param args
 */
public static void main(String[] args) {
    InetAddress address = null;
    try {
        address = InetAddress.getLocalHost();
    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    System.out.println("this is address:" + address);

        String hostName = address.getHostName();
        String hostAddress = address.getHostAddress();
        System.out.println("this is host name:" + hostName);
        System.out.println("this is host address:" + hostAddress);

        byte[] address4Byte = address.getAddress();
        System.out.println("this is address4Byte len:" + address4Byte.length);
        for (int i = 0; i < address4Byte.length; i++) {
            System.out.print(address4Byte[i]);
        }

}

}