code: public static Group groupsGet(String access_token){
  		HttpUriRequest httpUriRequest = RequestBuilder.post()
  				.setUri(BASE_URI+"/cgi-bin/groups/get")
  				.addParameter(PARAM_ACCESS_TOKEN, API.accessToken(access_token))
  				.build();
  		return LocalHttpClient.executeJsonResult(httpUriRequest,Group.class);
  	}
docs: 查询所有分组
  @param access_token access_token
  @return Group