code: public static Callbackip getcallbackip(String access_token){
  		HttpUriRequest httpUriRequest = RequestBuilder.get()
  				.setUri(BASE_URI + "/cgi-bin/getcallbackip")
  				.addParameter(PARAM_ACCESS_TOKEN,API.accessToken(access_token))
  				.build();
  		return LocalHttpClient.executeJsonResult(httpUriRequest,Callbackip.class);
  	}
docs: 获取微信服务器IP地址
  @param access_token access_token
  @return Callbackip