Java擷取IP地址

public static String getIp(){
        String localip=null;//本地IP，如果沒有配置外網IP則返回它
        String netip=null;  //外網IP
        try {
            Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
            while( netInterfaces.hasMoreElements() ) {
                NetworkInterface ni = netInterfaces.nextElement();
                Enumeration<InetAddress> address = ni.getInetAddresses();
                while( address.hasMoreElements() ) {
                    InetAddress ip=address.nextElement();
                    System.out.println( "interface name: "+ni.getName()
                                       + "; IP: "+ip.getHostAddress()
                                       + "; Site local address:"+ip.isSiteLocalAddress()
                                       + "; Loopback address: "+ip.isLoopbackAddress() );
                    if( ip.isLoopbackAddress() || ip.getHostAddress().indexOf(":")!=-1 )
                        continue;
                    
                    if( ip.isSiteLocalAddress() ){ //內網IP
                        localip=ip.getHostAddress();
                    } else { //外網IP     
                        netip = ip.getHostAddress();
                        break;
                    }
                }
                
                if( netip!=null )
                    break;
            }
        } catch (SocketException e) {
        }
        
        if(  netip!=null  )
            return netip;
        else if ( localip!=null )
            return localip;

        else

            return "127.0.0.1"

    }