java访问 某个地级市的天气

1.构造一个天气的模型（类）

1. public class WeatherInfo {  
2.     private String date;//时间  
3.     private String cityname;//城市名  
4.     private String weather;//天气  
5.     private String temperature;//气温  
6.     private String airquality;//pm2.5  
7.   
8.     public String getDate() {  
9.         return date;  
10.     }  
11.   
12.     public void setDate(String date) {  
13.         this.date = date;  
14.     }  
15.   
16.     public String getCityname() {  
17.         return cityname;  
18.     }  
19.   
20.     public void setCityname(String cityname) {  
21.         this.cityname = cityname;  
22.     }  
23.   
24.     public String getWeather() {  
25.         return weather;  
26.     }  
27.   
28.     public void setWeather(String weather) {  
29.         this.weather = weather;  
30.     }  
31.   
32.     public String getTemperature() {  
33.         return temperature;  
34.     }  
35.   
36.     public void setTemperature(String temperature) {  
37.         this.temperature = temperature;  
38.     }  
39.   
40.     public String getAirquality() {  
41.         return airquality;  
42.     }  
43.   
44.     public void setAirquality(String airquality) {  
45.         this.airquality = airquality;  
46.     }  
47.   
48.     @Override  
49.     public String toString() {  
50.         return "WeatherInfo [date=" + date + ", cityname=" + cityname  
51.                 + ", weather=" + weather + ", temperature=" + temperature  
52.                 + ", airquality=" + airquality + "]";  
53.     }  
54.       
55. } 

2.编写通过天气API获取天气信息和解析数据的的方法类

1. import java.io.BufferedReader;  
2. import java.io.IOException;  
3. import java.io.InputStream;  
4. import java.io.InputStreamReader;  
5. import java.io.UnsupportedEncodingException;  
6. import java.net.MalformedURLException;  
7. import java.net.URL;  
8. import java.net.URLConnection;  
9. import java.net.URLEncoder;  
10. import java.util.zip.GZIPInputStream;  
11.   
12. import net.sf.json.JSONArray;  
13. import net.sf.json.JSONObject;  
14.   
15. import org.junit.Test;  
16.   
17. /** 
18.  * 通过get请求向网站http://wthrcdn.etouch.cn/weather_mini获取某个 城市的天气状况数据，数据格式是Json 
19.  *  
20.  * @author 22786 
21.  *  
22.  */  
23. public class WeatherUtils {  
24.     /** 
25.      * 通过城市名称获取该城市的天气信息 
26.      *  
27.      * @param cityName 
28.      * @return 
29.      */  
30.       
31.     public  static String GetWeatherData(String cityname) {  
32.         StringBuilder sb=new StringBuilder();;  
33.         try {  
34.             //cityname = URLEncoder.encode(cityName, "UTF-8");  
35.             String weather_url = "http://wthrcdn.etouch.cn/weather_mini?city="+cityname;  
36.               
37.   
38.             URL url = new URL(weather_url);  
39.             URLConnection conn = url.openConnection();  
40.             InputStream is = conn.getInputStream();  
41.             GZIPInputStream gzin = new GZIPInputStream(is);  
42.             InputStreamReader isr = new InputStreamReader(gzin, "utf-8"); // 设置读取流的编码格式，自定义编码  
43.             BufferedReader reader = new BufferedReader(isr);  
44.             String line = null;  
45.             while((line=reader.readLine())!=null)  
46.                 sb.append(line+" ");  
47.             reader.close();  
48.         } catch (UnsupportedEncodingException e) {  
49.             // TODO Auto-generated catch block  
50.             e.printStackTrace();  
51.         } catch (MalformedURLException e) {  
52.             // TODO Auto-generated catch block  
53.             e.printStackTrace();  
54.         } catch (IOException e) {  
55.             // TODO Auto-generated catch block  
56.             e.printStackTrace();  
57.         }  
58.         //System.out.println(sb.toString());  
59.         return sb.toString();  
60.           
61.     }  
62.       
63.       
64.     /** 
65.      * 将JSON格式数据进行解析 ，返回一个weather对象 
66.      * @param str 
67.      * @return 
68.      */  
69.     public static WeatherInfo GetWeather(String weatherInfobyJson){  
70.         JSONObject dataOfJson = JSONObject.fromObject(weatherInfobyJson);  
71.         if(dataOfJson.getInt("status")!=1000)  
72.             return null;  
73.           
74.         //创建WeatherInfo对象，提取所需的天气信息  
75.         WeatherInfo weatherInfo = new WeatherInfo();  
76.           
77.         //从json数据中提取数据  
78.         String data = dataOfJson.getString("data");  
79.           
80.         dataOfJson = JSONObject.fromObject(data);  
81.         weatherInfo.setCityname(dataOfJson.getString("city"));;  
82.         weatherInfo.setAirquality(dataOfJson.getString("aqi"));  
83.           
84.         //获取预测的天气预报信息  
85.         JSONArray forecast = dataOfJson.getJSONArray("forecast");  
86.         //取得当天的  
87.         JSONObject result=forecast.getJSONObject(0);  
88.           
89.         weatherInfo.setDate(result.getString("date"));  
90.           
91.         String high = result.getString("high").substring(2);  
92.         String low  = result.getString("low").substring(2);  
93.           
94.         weatherInfo.setTemperature(low+"~"+high);  
95.           
96.         weatherInfo.setWeather(result.getString("type"));  
97.           
98.           
99.           
100.         return weatherInfo;  
101.     }  
102. }  

3.测试类

1. public class Test {  
2.     public static void main(String[]  args){  
3.         String info = WeatherUtils.GetWeatherData("武汉");  
4.         WeatherInfo weatherinfo = WeatherUtils.GetWeather(info);  
5.         System.out.println(weatherinfo.toString());  
6.     }  
7. }  

http://blog.youkuaiyun.com/qq_31028891/article/details/78597548