Java 获得天气信息

前面我们讲了java操作json的一些基本操作，现在就将他应用于实战中:

import java.io.BufferedReader; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.SocketTimeoutException; 
import java.net.URL; 
import java.net.URLConnection; 
 
import net.sf.json.JSONObject; 
 
public class Weather { 
    String Ctiyid; 
    URLConnection connectionData; 
    StringBuilder sb; 
    BufferedReader br;// 读取data数据流 
    JSONObject jsonData; 
    JSONObject info; 
     
    //从天气网解析的参数 
    String city ;// 城市 
    String date_y;//日期 
    String week ;// 星期 
    String fchh ;// 发布时间 
     
    String weather1 ;// 未来1到6天天气情况 
    String weather2 ; 
    String weather3 ; 
    String weather4 ; 
    String weather5 ; 
    String weather6 ; 
     
    String wind1;//未来1到6天风况 
    String wind2; 
    String wind3; 
    String wind4; 
    String wind5; 
    String wind6; 
     
    String fl1;//风的等级 
    String fl2; 
    String fl3; 
    String fl4; 
    String fl5; 
    String fl6; 
     
     
    String temp1 ;// 未来1到6天的气温 
    String temp2 ; 
    String temp3 ; 
    String temp4 ; 
    String temp5 ; 
    String temp6 ; 
     
    String index;// 今天的穿衣指数 
    String index_uv ;// 紫外指数 
    String index_tr ;// 旅游指数 
    String index_co ;// 舒适指数 
    String index_cl ;// 晨练指数 
    String index_xc;//洗车指数 
    String index_d;//天气详细穿衣指数 
     
  
     
    public Weather(String Cityid) throws IOException ,NullPointerException{ 
        // 解析本机ip地址 
 
        this.Ctiyid = Cityid; 
        // 连接中央气象台的API 
        URL url = new URL("http://m.weather.com.cn/data/" + Ctiyid + ".html"); 
        connectionData = url.openConnection(); 
        connectionData.setConnectTimeout(1000); 
        try { 
            br = new BufferedReader(new InputStreamReader( 
                    connectionData.getInputStream(), "UTF-8")); 
            sb = new StringBuilder(); 
            String line = null; 
            while ((line = br.readLine()) != null) 
                sb.append(line); 
        } catch (SocketTimeoutException e) { 
            System.out.println("连接超时"); 
        } catch (FileNotFoundException e) { 
            System.out.println("加载文件出错"); 
        } 
            String datas = sb.toString();   
            
           jsonData = JSONObject.fromObject(datas); 
          //  System.out.println(jsonData.toString());  
           info = jsonData.getJSONObject("weatherinfo"); 
          
        city = info.getString("city").toString(); 
        System.out.println(city);
        week =  info.getString("week").toString(); 
        date_y = info.getString("date_y").toString(); 
        fchh = info.getString("fchh").toString(); 
        //1到6天的天气 
        weather1 =  info.getString("weather1").toString(); 
        System.out.println(weather1);
        weather2 =  info.getString("weather2").toString(); 
        weather3 =  info.getString("weather3").toString(); 
        weather4 =  info.getString("weather4").toString(); 
        weather5 =  info.getString("weather5").toString(); 
        weather6 =  info.getString("weather6").toString(); 
        //1到6天的气温 
        temp1 = info.getString("temp1").toString(); 
        temp2 = info.getString("temp2").toString(); 
        temp3 = info.getString("temp3").toString(); 
        temp4 = info.getString("temp4").toString(); 
        temp5 = info.getString("temp5").toString(); 
        temp6 = info.getString("temp6").toString(); 
        //1到6天的风况 
        wind1 = info.getString("wind1").toString(); 
        wind2 = info.getString("wind2").toString(); 
        wind3 = info.getString("wind3").toString(); 
        wind4 = info.getString("wind4").toString(); 
        wind5 = info.getString("wind5").toString(); 
        wind6 = info.getString("wind6").toString(); 
        //1到6天的风速 
        fl1 = info.getString("fl1").toString(); 
        fl2 = info.getString("fl2").toString(); 
        fl3 = info.getString("fl3").toString(); 
        fl4 = info.getString("fl4").toString(); 
        fl5 = info.getString("fl5").toString(); 
        fl6 = info.getString("fl6").toString(); 
        //各种天气指数 
        index = info.getString("index").toString(); 
        index_uv = info.getString("index_uv").toString(); 
        index_tr = info.getString("index_tr").toString(); 
        index_co= info.getString("index_co").toString(); 
        index_cl = info.getString("index_cl").toString(); 
        index_xc = info.getString("index_xc").toString(); 
        index_d =  info.getString("index_d").toString(); 
 
    } 
    public static void main(String[] args) { 
        try { 
            new Weather("101270803"); // 101270803就是你的城市代码
        } catch (NullPointerException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } catch (IOException e) { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
    } 
} 
运行：

C:\java>java Weather
武胜
小雨

URL url = new URL("http://m.weather.com.cn/data/" + Ctiyid + ".html"); 这里就是中国天气网数据页面，然后我们URLConnection类的openConnection方法得到连接，再通过流的形行将其写到我们的StringBuilder之中。他是一串json的数据格式，所以我们就须要将他转正json，

jsonData = JSONObject.fromObject(datas);
info = jsonData.getJSONObject("info");

这里就是我们转化，然后info.getString("XX").toString(); 得到对应的数据了。

附：你看我们直接输入：http://m.weather.com.cn/data/101270803.html就能看到里的数据