获取IP地址

/**
	 * 用来获取手机拨号上网（包括CTWAP和CTNET）时由PDSN分配给手机终端的源IP地址。
	 * 
	 * @return ipv4
	 */
	private String getLocalIp()
	{
		try
		{
			for (Enumeration<NetworkInterface> en = NetworkInterface
					.getNetworkInterfaces(); en.hasMoreElements();)
			{
				NetworkInterface intf = en.nextElement();
				for (Enumeration<InetAddress> enumIpAddr = intf
						.getInetAddresses(); enumIpAddr.hasMoreElements();)
				{
					InetAddress inetAddress = enumIpAddr.nextElement();
					if (!inetAddress.isLoopbackAddress()
							&& inetAddress instanceof Inet4Address)
					{
						return inetAddress.getHostAddress().toString();
					}
				}
			}
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
		return "";
	}