实现天气预报功能

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import net.sf.json.JSONObject;
/**
 * 得到未来6天的天气(含今天)
 * @author Chewl
 *
 */
public class Weather {
    String Ctiyid;
    URLConnection connectionData;
    StringBuilder sb;
    BufferedReader br;// 读取data数据流
    JSONObject jsonData;
    JSONObject info;
    static String zhuangkuang ;
    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(10000);
        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) {
            Client.logger.error("加载天气预报时连接超时", e);
        } catch (FileNotFoundException e) {
        	Client.logger.error("加载天气预报文件出错", e);
        } catch (Exception e){
        	Client.logger.error("天气预报出现未知错误", e);
        }
        String datas = sb.toString();
        jsonData = JSONObject.fromObject(datas);
        info = jsonData.getJSONObject("weatherinfo");

        //得到1到6天的天气情况
        List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
        for(int i=1;i<=1;i++){
        	//得到未来6天的日期
        	Calendar cal = Calendar.getInstance();
        	cal.add(Calendar.DAY_OF_YEAR, i-1);

        	Map<String,Object> map = new HashMap<String, Object>();
        	map.put("weather", info.getString("weather"+i).toString());//天气
        	map.put("temp", info.getString("temp"+i).toString());//温度
        	list.add(map);
        }
        //控制台打印出天气
       for(int j=0;j<list.size();j++){
    	   Map<String,Object> wMap = list.get(j);
    	   zhuangkuang = (String) wMap.get("weather") + "           " + (String) wMap.get("temp");
    	}
    }

    protected static String haveConfig(String cityname) {
    	Properties prop = new Properties();
		InputStream in = null;
		String citycode = null;
		String bath= Weather.class.getResource("/").getPath();
		try {
			in = new FileInputStream(bath + "/city.properties");
			prop.load(in);
			citycode = prop.getProperty(cityname);
		} catch (Exception e) {

		} finally {
			try {
				if (in != null)
					in.close();
			} catch (IOException e) {

			}
		}
		return citycode;
	}

    public static String search(String cityname){
        try {
        	String citycode = haveConfig(cityname);
          //  new Weather("101210101");     // 101010100(北京)就是你的城市代码
        	new Weather(citycode);     // 101010100(北京)就是你的城市代码
        } catch (Exception e) {
            e.printStackTrace();
        }
        return zhuangkuang ;
    }

}

需要用到一个配置文件，里面包含各个天气的城市代码