Question

android中使用JAVA解析json数据

{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"4","WD":"东风","WS":"2级","SD":"75%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1011"}}
我想得到的结果是北京，4，东方，2级，75%，2，10:45，1，JC_RADAR_AZ9010_JB

Answer 1

这个格式使用如下代码解析

try {
    JSONObject jsonObject = new JSONObject(json);
    JSONObject weatherinfo = jsonObject.getJSONObject("weatherinfo");

    System.out.println(weatherinfo.getString("city"));
    System.out.println(weatherinfo.getString("cityid"));
    System.out.println(weatherinfo.getString("temp"));
    System.out.println(weatherinfo.getString("WD"));

} catch (JSONException e) {
    e.printStackTrace();
}
  其中第一行代码 JSONObject jsonObject = new JSONObject(json);//json 即为你的字符串
    
 比如现在天气信息是多个城市的，并非只有北京市。
{"weatherinfo":[{"city":"北京","cityid":"101010100","temp":"4","WD":"东风","WS":"2级","SD":"75%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1011"},{"city":"天津","cityid":"101010100","temp":"4","WD":"东风","WS":"2级","SD":"75%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1011"}]}
以下代码适用。   

try {
    JSONObject jsonObject=new JSONObject(json);
    JSONArray jsonArray=jsonObject.getJSONArray("weatherinfo");
  for (int i=0;i<jsonArray.length();i++){
      JSONObject object = jsonArray.getJSONObject(i);
      System.out.println(object.getString("city"));
      System.out.println(object.getString("cityid"));
      System.out.println(object.getString("temp"));
      System.out.println(object.getString("WD"));
  }
} catch (JSONException e) {
    e.printStackTrace();
}

Answer 2

import org.json.JSONException;
import org.json.JSONObject;

public class test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String s = "{\"weatherinfo\":{\"city\":\"北京\",\"cityid\":\"101010100\",\"temp\":\"4\",\"WD\":\"东风\",\"WS\":\"2级\",\"SD\":\"75%\",\"WSE\":\"2\",\"time\":\"10:45\",\"isRadar\":\"1\",\"Radar\":\"JC_RADAR_AZ9010_JB\",\"njd\":\"暂无实况\",\"qy\":\"1011\"}}";

		try {
			JSONObject jsonObject = new JSONObject(s);
			JSONObject json = (JSONObject) jsonObject.get("weatherinfo");
			System.out.println(json.getString("city"));
			System.out.println(json.getInt("temp"));
			System.out.println(json.getString("WD"));
			System.out.println(json.getString("WS"));
			System.out.println(json.getString("SD"));
			System.out.println(json.getInt("WSE"));
			System.out.println(json.getString("time"));
			System.out.println(json.getString("isRadar"));
			System.out.println(json.getString("Radar"));
		} catch (JSONException e) {
			e.printStackTrace();
		}
	}

}