Xử lý json từ api openWeatherMap để lấy thông tin thời tiết

Coord.java

package com.huantt;

/**
 * Created by Huan on 7/8/2016.
 */
public class Coord {
    float lon;
    float lat;

    public Coord(float lon, float lat) {
        this.lon = lon;
        this.lat = lat;
    }

    public float getLon() {
        return lon;
    }

    public float getLat() {
        return lat;
    }

}

Main.java

package com.huantt;

import java.io.IOException;

/**
 * Created by Huan on 7/7/2016.
 */
public class Main {
    public static void main(String[] args) throws IOException {
        WeatherForecast weatherForecast = new WeatherForecast("HaNoi","VietNam");
        Coord coord = weatherForecast.getCoord();
        //System.out.println(coord.getLon());
        System.out.println(weatherForecast.getWeather().toString());

    }
}

Main2

package com.huantt;

/**
 * Created by Huan on 7/8/2016.
 */
public class Main2 {
    public static void main(String[] args) {


        WeatherForecast w = new WeatherForecast("HaNoi", "VietNam");
        System.out.println(w.getWeatherData().getCoord().getLat());
    }
}

Weather.java

package com.huantt;

/**
 * Created by Huan on 7/8/2016.
 */
public class Weather {
    private int id;
    private String description;
    private String main;

    public Weather(int id, String description, String main) {
        this.id = id;
        this.description = description;
        this.main = main;
    }

    public int getId() {
        return id;
    }

    public String getDescription() {
        return description;
    }

    public String getMain() {
        return main;
    }

    @Override
    public String toString() {
        return "Weather: " +
                "\nid = " + id +
                "\ndescription = '" + description + '\'' +
                "\nweather: "+ main;
    }
}

WeatherData.java

package com.huantt;

/**
 * Created by Huan on 7/8/2016.
 */
public class WeatherData {

    private Coord coord;
    private Weather[] weather;

    public WeatherData(Coord coord, Weather[] weather) {
        this.coord = coord;
        this.weather = weather;
    }

    public Coord getCoord() {
        return coord;
    }

    public Weather[] getWeather() {
        return weather;
    }
}
//Cứ thấy ngoặc [] thì nó là mảng, và coi data đó là 1 object thì đây là 1 mảng object

WeatherForecast.java

package com.huantt;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by Huan on 7/8/2016.
 */
public class WeatherForecast {
    private String city;
    private String contry;
    private Gson gson;
    private JsonParser jParser;
    private JsonObject jsonObject;

    public WeatherForecast(String city, String contry) {
        this.city = city;
        this.contry = contry;
        gson = new Gson();
//        jParser = new JsonParser();
//        jsonObject = (JsonObject) jParser.parse(getJson(getLink()));
        //Dùng jsonObject là 1 cách, nhưng có thể chỉ cần dùng Gson thôi
        // Như method getWeatherData chỉ dùng gson nó sẽ tự tìm field trong Object WeatherData
        // Thấy field nào tên giống thì nó lưu dữ liệu vào
    }

//    public Weather getWeather() {
//        String weatherJson = jsonObject.get("weather").toString().replace("[", "").replace("]", "");
//        Weather weather = gson.fromJson(weatherJson, Weather.class);
//        return weather;
//    }
//
//    public Coord getCoord() {
//        Coord coord = gson.fromJson(jsonObject.get("coord"), Coord.class);
//        return coord;
//    }

    public WeatherData getWeatherData() {
        WeatherData weatherData = gson.fromJson(getJson(getLink()), WeatherData.class);
        return weatherData;

    }

    String getJson(String link) {
        StringBuilder data = new StringBuilder();
        try {
            URL url = new URL(link);
            BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
            String line;
            while ((line = in.readLine()) != null)
                data.append(line);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return data.toString();
    }

    String getLink() {
        String link = "http://api.openweathermap.org/data/2.5/weather?q=" + city + "," + contry + "&appid=cabc9614649278ff314eb4f62e95942e";
        return link;
    }
}