如何通过URL获取天气PM2.5的数据，返回json

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.*;


public class pm {

    public static String loadJson (String url) {  
        StringBuilder json = new StringBuilder();  
        try {  
            URL urlObject = new URL(url);  
            URLConnection uc = urlObject.openConnection();  
            BufferedReader in = new BufferedReader(new InputStreamReader(uc.getInputStream(), "UTF-8"));  
            String inputLine = null;  
            while ( (inputLine = in.readLine()) != null) {  
                json.append(inputLine);  
            }  
            in.close();  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return json.toString();  
    }  
    
    public static void main(String[] args) {  
         String url = "http://www.pm25.in/api/querys.json?token=5j1znBVAsnSf5xQyNQyq";
                    String json = loadJson(url);  
                    
                    System.out.println(json);    
    }
    
}

获取一个城市所有监测点的PM2.5数据
地址	http://www.pm25.in/api/querys/pm2_5.json?city=weinan&token=5j1znBVAsnSf5xQyNQyq

详细过程可查看  http://www.cnblogs.com/sanzangtdashi/p/6807341.html　

详细过程可查看  http://www.cnblogs.com/sanzangtdashi/p/6807341.html

详细过程可查看  http://www.cnblogs.com/sanzangtdashi/p/6807341.html

结果截图