Fetching weather data using java and the wunderground api

Question

I'm trying to fetch some weather data using java. I am using the following java api for fetching the data from wunderground.com

https://code.google.com/p/wunderground-core/

The example code they give on their website works okay for (Dortmund in Germany). However when I change the key from dortmund to Boston in the U.S.A, I get null pointer errors. Any idea what I could be doing wrong? Please try it and leave comments/advice. Thanks!

Code:

import de.mbenning.weather.wunderground.api.domain.DataSet;
import de.mbenning.weather.wunderground.api.domain.WeatherStation;
import de.mbenning.weather.wunderground.api.domain.WeatherStations;
import de.mbenning.weather.wunderground.impl.services.HttpDataReaderService;


public class weather {

    public static void main(String[] args)
    {

    // create a instance of a wunderground data reader
    HttpDataReaderService dataReader = new HttpDataReaderService();

    // select a wunderground weather station (ID "INORDRHE72" = Dortmund-Mengede)
    WeatherStation weatherStation = WeatherStations.ALL.get("INORDRHE72");
    // KMABOSTO22 is the ID for Boston South end
    //WeatherStation weatherStation = WeatherStations.ALL.get("KMABOSTO32");

    // set selected weather station to data reader
    dataReader.setWeatherStation(weatherStation);

    // get current (last) weather data set from selected station
    DataSet current = dataReader.getCurrentData();

    // print selected weather station ID
    System.out.println(weatherStation.getStationId());

    // print city, state and country of weather station
    System.out.println(weatherStation.getCity() + " " + weatherStation.getState() + " " + weatherStation.getCountry());

    //`enter code here` print datetime of measure and temperature ...
    System.out.println(current.getDateTime() + " " + current.getTemperature());
    }

}

You'd be getting `NullPointerException`s if `weatherStation` is `null`. Are you sure it's part of the `WeatherStations.ALL` object? Have you tried debugging? — t0mppa, Nov 24 '13 at 17:30
KMABOSTO32 //WeatherStation weatherStation = WeatherStations.ALL.get("KMABOSTO32"); — Ammar, Nov 24 '13 at 17:46
Instead of calling `WeatherStation weatherStation = WeatherStations.ALL.get("INORDRHE72");` do it this way `WeatherStation weatherStation = new WeatherStation("KMABOSTO32");`. This will give you at least the date+time and the temperature without changing the source of the API. — rawdog, Nov 24 '13 at 19:26

score 1 · Accepted Answer · answered Nov 24 '13 at 17:59

Check out the source code of the Wunderground API.

svn checkout http://wunderground-core.googlecode.com/svn/trunk/ wunderground-core-read-only

In the package de.mbenning.weather.wunderground.api.domain there is a class called WeatherStations. There you will find the content of all weather stations you can call in your code. Right now there are only a few ones:

public static final Map<String, WeatherStation> ALL = new HashMap<String, WeatherStation>();
static {
    ALL.put("INRWKLEV2", INRWKLEV2_KLEVE);
    ALL.put("INORDRHE110", INORDRHE110_GOCH);
    ALL.put("IDRENTHE48", IDRENTHE48_COEVORDEN);
    ALL.put("IZEELAND13", IZEELAND13_GOES);
    ALL.put("INORDRHE72", INORDRHE72_DORTMUND);
    ALL.put("INOORDBR35", INOORDBR35_BOXMEER);
};

All others won't work.

score 1 · Answer 2 · answered Jan 09 '14 at 12:05

It works: You can instantiate every weather station which is registered on WUnderground. It's possible to set the station id as contructor parameter:

WeatherStation aWeatherStation = new WeatherStation("INORDRHE72");

HttpDataReaderService dataReader = new HttpDataReaderService();
dataReader.setWeatherStation(aWeatherStation );

Double currentTemperature = dataReader.getCurrentData().getTemperature();

Fetching weather data using java and the wunderground api

2 Answers2