Java调用天气接口（百度天气）解析返回的JSON数据

简介：本文详细讲述了通过Java调用百度天气接口的方法，取得返回的JSON格式的数据，并且通过第三方包解析JSON格式的数据。

通过百度天气API调用网络编程接口接收返回的JSON格式的数据。

关于百度天气接口的详细说明可以参考文章： http://www.cnblogs.com/txw1958/p/baidu-weather-forecast-api.html

使用百度提供的天气接口，也就是通过一个URL访问百度天气服务器，通过给URL可以取得包含天气信息的JSON格式的数据。

<pre name="code" class="java">import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

                //根据城市获取天气信息的java代码
                //cityName 是你要取得天气信息的城市的中文名字，如“北京”，“深圳”
		static String  getWeatherInform(String cityName){
		
			//百度天气API
			String baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location=北京&output=json&ak=W69oaDTCfuGwzNwmtVvgWfGH";
			StringBuffer strBuf;
	
			try {                            
                                //通过浏览器直接访问http://api.map.baidu.com/telematics/v3/weather?location=北京&output=json&ak=5slgyqGDENN7Sy7pw29IUvrZ
                                //5slgyqGDENN7Sy7pw29IUvrZ 是我自己申请的一个AK(许可码)，如果访问不了，可以自己去申请一个新的ak
                                //百度ak申请地址：http://lbsyun.baidu.com/apiconsole/key
                                //要访问的地址URL，通过URLEncoder.encode()函数对于中文进行转码                            
				baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location="+URLEncoder.encode(cityName, "utf-8")+"&output=json&ak=5slgyqGDENN7Sy7pw29IUvrZ";					
			} catch (UnsupportedEncodingException e1) {				
				e1.printStackTrace();					
			}

			strBuf = new StringBuffer();
				
			try{
				URL url = new URL(baiduUrl);
				URLConnection conn = url.openConnection();
				BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));//转码。
				String line = null;
				while ((line = reader.readLine()) != null)
				    strBuf.append(line + " ");
				    reader.close();
			}catch(MalformedURLException e) {
				e.printStackTrace(); 
			}catch(IOException e){
				e.printStackTrace(); 
			}	

			return strBuf.toString();
		}

上面调用百度天气接口的函数返回的JSON格式的数据如下：

{"error":0,"status":"success","date":"2014-08-27","results":[{"currentCity":"北京","pm25":"89","index":[{"title":"穿衣","zs":"炎热","tipt":"穿衣指数","des":"天气炎热，建议着短衫、短裙、短裤、薄型T恤衫等清凉夏季服装。"},{"title":"洗车","zs":"较适宜","tipt":"洗车指数","des":"较适宜洗车，未来一天无雨，风力较小，擦洗一新的汽车至少能保持一天。"},{"title":"旅游","zs":"较适宜","tipt":"旅游指数","des":"天气较好，温度较高，天气较热，但有微风相伴，还是比较适宜旅游的，不过外出时要注意防暑防晒哦！"},{"title":"感冒","zs":"少发","tipt":"感冒指数","des":"各项气象条件适宜，发生感冒机率较低。但请避免长期处于空调房间中，以防感冒。"},{"title":"运动","zs":"较适宜","tipt":"运动指数","des":"天气较好，户外运动请注意防晒。推荐您进行室内运动。"},{"title":"紫外线强度","zs":"中等","tipt":"紫外线强度指数","des":"属中等强度紫外线辐射天气，外出时建议涂擦SPF高于15、PA+的防晒护肤品，戴帽子、太阳镜。"}],"weather_data":[{"date":"周三 08月27日 (实时：29℃)","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"微风","temperature":"33 ~ 20℃"},{"date":"周四","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/leizhenyu.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/zhenyu.png","weather":"雷阵雨转阵雨","wind":"微风","temperature":"28 ~ 19℃"},{"date":"周五","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/duoyun.png","weather":"多云","wind":"微风","temperature":"29 ~ 20℃"},{"date":"周六","dayPictureUrl":"http://api.map.baidu.com/images/weather/day/duoyun.png","nightPictureUrl":"http://api.map.baidu.com/images/weather/night/yin.png","weather":"多云转阴","wind":"微风","temperature":"29 ~ 20℃"}]}]}

现在需要对该JSON格式的数据进行解析。

上面返回的JSON格式的数据包含四天的天气信息。现在对JSON格式的数据进行解析。

//需要导入解析JSON格式数据的第三方包   请百度搜索并下载，导入“jsonlib.rar”包
import net.sf.json.JSONArray;
import net.sf.json.JSONException;
import net.sf.json.JSONObject;

	//解析JSON数据  要解析的JSON数据:strPar
        //WeatherInf  是自己定义的承载所有的天气信息的实体类，包含了四天的天气信息。详细定义见后面。
	static WeatherInf resolveWeatherInf(String strPar){
		
		 JSONObject dataOfJson = JSONObject.fromObject(strPar);
	        
		 if(dataOfJson.getInt("error")!=0){
			 return null;
		 }
		 
		 //保存全部的天气信息。
		 WeatherInf weatherInf = new WeatherInf();

		 //从json数据中取得的时间�?
	        String date = dataOfJson.getString("date");
	        int year = Integer.parseInt(date.substring(0, 4));
	        int month = Integer.parseInt(date.substring(5, 7));
	        int day = Integer.parseInt(date.substring(8, 10));
	        Date today = new Date(year-1900,month-1,day);

	        JSONArray results=dataOfJson.getJSONArray("results");
	        JSONObject results0=results.getJSONObject(0);
	        
	        String location = results0.getString("currentCity");
	        int pmTwoPointFive;

	        if(results0.getString("pm25").isEmpty()){
	        	pmTwoPointFive = 0;
	        }else{
	        	pmTwoPointFive = results0.getInt("pm25");
	        }
	        //System.out.println(results0.get("pm25").toString()+"11");
	        
	        try{
	        	
		        JSONArray index = results0.getJSONArray("index");
		        
		        JSONObject index0 = index.getJSONObject(0);//穿衣
		        JSONObject index1 = index.getJSONObject(1);//洗车
		        JSONObject index2 = index.getJSONObject(2);//感冒
		        JSONObject index3 = index.getJSONObject(3);//运动
		        JSONObject index4 = index.getJSONObject(4);//紫外线强度
		        

		    	String dressAdvise = index0.getString("des");//穿衣建议
		    	String washCarAdvise = index1.getString("des");//洗车建议
		    	String coldAdvise = index2.getString("des");//感冒建议
		    	String sportsAdvise = index3.getString("des");//运动建议
		    	String ultravioletRaysAdvise = index4.getString("des");//紫外线建议
		        
		    	weatherInf.setDressAdvise(dressAdvise);
		    	weatherInf.setWashCarAdvise(washCarAdvise);
		    	weatherInf.setColdAdvise(coldAdvise);
		    	weatherInf.setSportsAdvise(sportsAdvise);
		    	weatherInf.setUltravioletRaysAdvise(ultravioletRaysAdvise);
	        	
	        }catch(JSONException jsonExp){
	        	
		    	weatherInf.setDressAdvise("要温度，也要风度。天热缓减衣，天凉及添衣！");
		    	weatherInf.setWashCarAdvise("你洗还是不洗，灰尘都在哪里，不增不减。");
		    	weatherInf.setColdAdvise("一天一个苹果，感冒不来找我！多吃水果和蔬菜。");
		    	weatherInf.setSportsAdvise("生命在于运动！不要总宅在家里哦！");
		    	weatherInf.setUltravioletRaysAdvise("心灵可以永远年轻，皮肤也一样可以！");
	        }
	            
	        JSONArray weather_data = results0.getJSONArray("weather_data");//weather_data中有四项�?
	        
                        //OneDayWeatherInf是自己定义的承载某一天的天气信息的实体类，详细定义见后面。
			OneDayWeatherInf[] oneDayWeatherInfS = new OneDayWeatherInf[4];
			for(int i=0;i<4;i++){
				oneDayWeatherInfS[i] = new OneDayWeatherInf();
			}
			
	        for(int i=0;i<weather_data.size();i++){
	        	
	        	JSONObject OneDayWeatherinfo=weather_data.getJSONObject(i);
	        	String dayData = OneDayWeatherinfo.getString("date");
	        	OneDayWeatherInf oneDayWeatherInf = new OneDayWeatherInf();

	        	oneDayWeatherInf.setDate((today.getYear()+1900)+"."+(today.getMonth()+1)+"."+today.getDate());
	        	today.setDate(today.getDate()+1);//增加一天
	        	
	        	oneDayWeatherInf.setLocation(location);
	        	oneDayWeatherInf.setPmTwoPointFive(pmTwoPointFive);
	        	
	        	if(i==0){//第一个，也就是当天的天气，在date字段中最后包含了实时天气
	        		int beginIndex = dayData.indexOf("：");
	        		int endIndex = dayData.indexOf(")");
	        		if(beginIndex>-1){
	        			oneDayWeatherInf.setTempertureNow(dayData.substring(beginIndex+1, endIndex));
	        			oneDayWeatherInf.setWeek(OneDayWeatherinfo.getString("date").substring(0,2));
	        		}else{
	        			oneDayWeatherInf.setTempertureNow(" ");
	        			oneDayWeatherInf.setWeek(OneDayWeatherinfo.getString("date").substring(0,2));
	        		}

	        	}else{
	        		oneDayWeatherInf.setWeek(OneDayWeatherinfo.getString("date"));
	        	}
	        	
	        	oneDayWeatherInf.setTempertureOfDay(OneDayWeatherinfo.getString("temperature"));
			oneDayWeatherInf.setWeather(<span style="font-family: Arial, Helvetica, sans-serif;">OneDayWeatherinfo.getString("weather")</span><span style="font-family: Arial, Helvetica, sans-serif;">);</span>
	        	oneDayWeatherInf.setWeather(weather);
	        	oneDayWeatherInf.setWind(OneDayWeatherinfo.getString("wind"));
	        	        	
		        oneDayWeatherInfS[i] = oneDayWeatherInf;
	        }
	        
	        weatherInf.setWeatherInfs(oneDayWeatherInfS);

		return weatherInf;
	}

现在就将JSON格式的数据提取出来放到Java中的实体类中了。

附1：

<pre name="code" class="java">//WeatherInf 是自己定义的承载所有的天气信息的实体类，包含了四天的天气信息。
public class WeatherInf {

	private OneDayWeatherInf[] weatherInfs;
	private String dressAdvise;//穿衣建议
	private String washCarAdvise;//洗车建议
	private String coldAdvise;//感冒建议
	private String sportsAdvise;//运动建议
	private String ultravioletRaysAdvise;//紫外线建议
	
	
	public WeatherInf(){
		dressAdvise = "";
		washCarAdvise = "";
		coldAdvise = "";
		sportsAdvise = "";
		ultravioletRaysAdvise = "";
	}
	
	public void printInf(){
		
		System.out.println(dressAdvise);
		System.out.println(washCarAdvise);
		System.out.println(coldAdvise);
		System.out.println(sportsAdvise);
		System.out.println(ultravioletRaysAdvise);
		for(int i=0;i<weatherInfs.length;i++){
			System.out.println(weatherInfs[i]);
		}
		
	}
	

	public OneDayWeatherInf[] getWeatherInfs() {
		return weatherInfs;
	}


	public void setWeatherInfs(OneDayWeatherInf[] weatherInfs) {
		this.weatherInfs = weatherInfs;
	}


	public String getDressAdvise() {
		return dressAdvise;
	}


	public void setDressAdvise(String dressAdvise) {
		this.dressAdvise = dressAdvise;
	}


	public String getWashCarAdvise() {
		return washCarAdvise;
	}


	public void setWashCarAdvise(String washCarAdvise) {
		this.washCarAdvise = washCarAdvise;
	}


	public String getColdAdvise() {
		return coldAdvise;
	}


	public void setColdAdvise(String coldAdvise) {
		this.coldAdvise = coldAdvise;
	}


	public String getSportsAdvise() {
		return sportsAdvise;
	}


	public void setSportsAdvise(String sportsAdvise) {
		this.sportsAdvise = sportsAdvise;
	}


	public String getUltravioletRaysAdvise() {
		return ultravioletRaysAdvise;
	}


	public void setUltravioletRaysAdvise(String ultravioletRaysAdvise) {
		this.ultravioletRaysAdvise = ultravioletRaysAdvise;
	}
	
}

附2：

<pre name="code" class="java">//OneDayWeatherInf是自己定义的承载某一天的天气信息的实体类  
public class OneDayWeatherInf {  
  
    private  
        String location;  
        String date;  
        String week;  
        String tempertureOfDay;  
        String tempertureNow;  
        String wind;  
        String weather;   
        String picture;  
        int pmTwoPointFive;  
  
    public OneDayWeatherInf(){  
          
        location = "";  
        date = "";  
        week = "";  
        tempertureOfDay = "";  
        tempertureNow = "";  
        wind = "";  
        weather = "";  
        picture = "undefined";  
        pmTwoPointFive = 0;  
    }  
          
          
          
    public String getLocation() {  
        return location;  
    }  
    public void setLocation(String location) {  
        this.location = location;  
    }  
    public String getDate() {  
        return date;  
    }  
    public void setDate(String date) {  
        this.date = date;  
    }  
    public String getWeek() {  
        return week;  
    }  
    public void setWeek(String week) {  
        this.week = week;  
    }  
    public String getTempertureOfDay() {  
        return tempertureOfDay;  
    }  
    public void setTempertureOfDay(String tempertureOfDay) {  
        this.tempertureOfDay = tempertureOfDay;  
    }  
    public String getTempertureNow() {  
        return tempertureNow;  
    }  
    public void setTempertureNow(String tempertureNow) {  
        this.tempertureNow = tempertureNow;  
    }  
    public String getWind() {  
        return wind;  
    }  
    public void setWind(String wind) {  
        this.wind = wind;  
    }  
    public String getWeather() {  
        return weather;  
    }  
    public void setWeather(String weather) {  
        this.weather = weather;  
    }  
    public String getPicture() {  
        return picture;  
    }  
    public void setPicture(String picture) {  
        this.picture = picture;  
    }  
    public int getPmTwoPointFive() {  
        return pmTwoPointFive;  
    }  
    public void setPmTwoPointFive(int pmTwoPointFive) {  
        this.pmTwoPointFive = pmTwoPointFive;  
    }  
  
    public String toString(){  
          
        return location+"   "+date+"   "+week+" tempertureOfDay：  "+tempertureOfDay+" tempertureNow：  "+tempertureNow+"   "+wind+"   "+weather+"   "+picture+"   "+pmTwoPointFive;  
    }  
      
      
}

Java调用天气接口（百度天气）解析返回的JSON数据

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