• 采用的是和风天气的降水接口，因为api需要付费，所以就不把自己的key放出来了。
• json解析工具用的是阿里巴巴的fastjson。用了很多次的System.out.println(),只是为了测试。
• 代码如下：

package json;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class Demo2
{
    public static void main(String[] args) throws Exception
    {
        //参数字符串，如果拼接在请求链接之后，需要对中文进行 URLEncode   字符集 UTF-8
        String param = "location=108.62 ,21.95&key=写你自己的key";
        StringBuilder sb = new StringBuilder();
        InputStream is = null;
        BufferedReader br = null;
        PrintWriter out = null;
        try {
            //接口地址
            String url = "https://api.heweather.net/s6/weather/grid-minute";
            URL    uri = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) uri.openConnection();
            connection.setRequestMethod("POST");
            connection.setReadTimeout(5000);
            connection.setConnectTimeout(10000);
            connection.setRequestProperty("accept", "*/*");
            //发送参数
            connection.setDoOutput(true);
            out = new PrintWriter(connection.getOutputStream());
            out.print(param);
            out.flush();
            //接收结果
            is = connection.getInputStream();
            br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            String line;
            //缓冲逐行读取
            while ( ( line = br.readLine() ) != null )
            {
                sb.append(line);
            }
            String backStr=sb.toString();
            System.out.println(backStr);
            JSONObject jsonObject = JSONObject.parseObject(backStr);
            JSONArray heWeather6 = jsonObject.getJSONArray("HeWeather6");
            System.out.println(heWeather6);
            JSONObject jsonObject1 = heWeather6.getJSONObject(0);
            System.out.println(jsonObject1);
            JSONObject basic = jsonObject1.getJSONObject("basic");
            System.out.println(basic);
            String parent_city = basic.getString("parent_city");
            System.out.println(parent_city);
            String lon = basic.getString("lon");
            System.out.println(lon);
            String lat = basic.getString("lat");
            System.out.println(lat);

            System.out.println("--------------");
            JSONArray pcpn_5m = jsonObject1.getJSONArray("pcpn_5m");
            for (int i = 0; i < pcpn_5m.size(); i++)
            {
                JSONObject jsonObject2 = pcpn_5m.getJSONObject(i);
                System.out.println(jsonObject2);

            }
        } catch ( Exception e )
        {
            System.out.println(e);
        } finally
        {
            //关闭流
            try
            {
                if(is!=null)
                {
                    is.close();
                }
                if(br!=null)
                {
                    br.close();
                }
                if (out!=null)
                {
                    out.close();
                }
            } catch ( Exception ignored )
            {
                System.out.println(ignored);
            }
        }


    }
}

• 运行结果如下图：