android Json解析

1.需解析的json文件（中括号[]括起来的是json数组）

{    "HeWeather data service 3.0": [        {            "aqi": {                "city": {                    "aqi": "28",                    "co": "0",                    "no2": "15",                    "o3": "94",                    "pm10": "25",                    "pm25": "13",                    "qlty": "优",                    "so2": "2"                }            },            "basic": {                "city": "北京",                "cnty": "中国",                "id": "CN101010100",                "lat": "39.904000",                "lon": "116.391000",                "update": {                    "loc": "2016-09-05 17:52",                    "utc": "2016-09-05 09:52"                }            },            "daily_forecast": [                {                    "astro": {                        "sr": "05:46",                        "ss": "18:39"                    },                    "cond": {                        "code_d": "100",                        "code_n": "101",                        "txt_d": "晴",                        "txt_n": "多云"                    },                    "date": "2016-09-05",                    "hum": "26",                    "pcpn": "0.7",                    "pop": "93",                    "pres": "1009",                    "tmp": {                        "max": "31",                        "min": "20"                    },                    "vis": "10",                    "wind": {                        "deg": "294",                        "dir": "无持续风向",                        "sc": "微风",                        "spd": "6"                    }                },                ...

2.需获取的数据

"wind_sc":"微风","wind_dir":"无持续风向""ss":"18:41","sr":"05:46""tmp":{"min":"18","max":"30"},"txt_d":"雷阵雨""txt_n":"多云"

3.创建类Item

package app.coolwhether.com.weatherapp.entity;/** * Created by kirito on 2016/9/3. */public class Item {    private String wind_sc;    private String wind_dir;    private String tmp_min;    private String tmp_max;    private String txt_d;    private String txt_n;    private String ss;    private String sr;    private String date;    public String getWind_sc() {        return wind_sc;    }    public void setWind_sc(String wind_sc) {        this.wind_sc = wind_sc;    }    public String getWind_dir() {        return wind_dir;    }    public void setWind_dir(String wind_dir) {        this.wind_dir = wind_dir;    }    public String getTmp_min() {        return tmp_min;    }    public void setTmp_min(String tmp_min) {        this.tmp_min = tmp_min;    }    public String getTxt_d() {        return txt_d;    }    public void setTxt_d(String txt_d) {        this.txt_d = txt_d;    }    public String getTxt_n() {        return txt_n;    }    public void setTxt_n(String txt_n) {        this.txt_n = txt_n;    }    public String getTmp_max() {        return tmp_max;    }    public void setTmp_max(String tmp_max) {        this.tmp_max = tmp_max;    }    public String getSs() {        return ss;    }    public void setSs(String ss) {        this.ss = ss;    }    public String getSr() {        return sr;    }    public void setSr(String sr) {        this.sr = sr;    }    public String getDate() {        return date;    }    public void setDate(String date) {        this.date = date;    }}

4.从URL获取数据（此处参照：android从URL获取数据）

5.json解析类

package app.coolwhether.com.weatherapp.support;import android.util.Log;import com.google.gson.Gson;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import java.util.ArrayList;import java.util.List;import app.coolwhether.com.weatherapp.entity.Item;/** * Created by kirito on 2016/9/3. */public class JsonHelper {    private static final String TAG = "JsonHelper";    public static Item parseJsonToItem(String json) throws JSONException{        JSONObject jsonObject = new JSONObject(json);        JSONArray heWeather = jsonObject.getJSONArray("HeWeather data service 3.0");        //Log.e(TAG, "parseJsonToList: ---heWeather"+heWeather);        Item item = new Item();        JSONObject object = heWeather.getJSONObject(0);//0或是其它数字（数列heWeather的下标都可以）        JSONArray daily_forecast = null;        if (object.has("daily_forecast")){            daily_forecast = object.getJSONArray("daily_forecast");            //Log.e(TAG, "parseJsonToList: daily_forecast---"+daily_forecast );            JSONObject obj = daily_forecast.getJSONObject(0);            JSONObject wind = null;            if (obj.has("wind")){                wind = obj.getJSONObject("wind");                //Log.e(TAG, "parseJsonToList: wind---"+wind );                item.setWind_dir(wind.optString("dir"));                item.setWind_sc(wind.optString("sc"));                //Log.e(TAG, "parseJsonToList: dir,sc"+ wind.optString("dir"));            }            JSONObject astro = null;            if (obj.has("astro")){                astro = obj.getJSONObject("astro");                item.setSr(astro.optString("sr"));                item.setSs(astro.optString("ss"));                //Log.e(TAG, "parseJsonToItem: ss---"+ astro.optString("ss"));            }            JSONObject temp = null;            if (obj.has("tmp")){                temp = obj.getJSONObject("tmp");                item.setTmp_max(temp.optString("max"));                item.setTmp_min(temp.optString("min"));                //Log.e(TAG, "parseJsonToItem: max---"+ temp.optString("max"));            }            if(obj.has("date")){                item.setDate(obj.optString("date"));                //Log.e(TAG, "parseJsonToItem: date---"+ obj.optString("date"));            }            if (obj.has("cond")){                JSONObject cond = obj.getJSONObject("cond");                item.setTxt_d(cond.optString("txt_d"));                item.setTxt_n(cond.optString("txt_n"));                //Log.e(TAG, "parseJsonToItem: txt_d---"+ cond.optString("txt_d"));            }        }        return item;    }}

6.调用的方法

item = JsonHelper.parseJsonToItem(s);//s为URL处获取的json数据

7.然后即可通过返回的item获取需要的数据.