android的json解析

1.评价：
json解析是最主流的解析第三方接口源数据的方法

2.解析对象的类型：
a.jsonObject
b.jsonArray

3.进行json解析的步骤（以jsonObject为例）
a.获得json的父级标签，例如：JsonObject js = new JsonObject(json数据源)
b.根据父级标签获得子级标签，例如：JsonObject result = js.getJsonObject(“result”)—>注：result是子级标签的名字
c.获得json具体数据：
result.getJsonObject(“result”).getString(“值名称”);

4.代码实例：
asyntask获得天气数据，数据经过json进行解析。

package net.lamp.weatherforcast;import java.io.IOException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;import org.json.JSONException;import org.json.JSONObject;import android.app.Activity;import android.media.MediaPlayer;import android.os.AsyncTask;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity {    private EditText et;    private TextView tv;    String cityname;    private WeatureInfo weatureinfo;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et = (EditText) findViewById(R.id.main_et);        tv = (TextView) findViewById(R.id.main_tv_weather);    }    public void getjson(View v) {        cityname = et.getText().toString().trim();        if (cityname==null||cityname.equals("")) {                cityname="北京";        }           String url = "http://v.juhe.cn/weather/index?format=2&cityname="+cityname+"&key=7453f4a7cee3ed86f6fdae5a46e8a78b";        AsyncTask<String, Void, WeatureInfo> task = new AsyncTask<String, Void, WeatureInfo>() {            WeatureInfo wi = null;            @Override            protected WeatureInfo doInBackground(String... params) {                // TODO Auto-generated method stub                HttpClient hc = new DefaultHttpClient();                HttpGet hg = new HttpGet(params[0]);                //发送请求获得响应                try {                    HttpResponse hr = hc.execute(hg);                    HttpEntity he = hr.getEntity();                    String content = EntityUtils.toString(he, HTTP.UTF_8);                    //wi获得经过json解析过的javabean对象                    wi = getWeatureinfo(content);                } catch (ClientProtocolException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                return wi;            }            @Override            protected void onPostExecute(WeatureInfo result) {                // TODO Auto-generated method stub                super.onPostExecute(result);                tv.setText(result.toString());            }            @Override            protected void onPreExecute() {                // TODO Auto-generated method stub                super.onPreExecute();            }            @Override            protected void onProgressUpdate(Void... values) {                // TODO Auto-generated method stub                super.onProgressUpdate(values);            }        };        task.execute(url);    }    //json解析：参数是String型的json原数据  返回类型：javabean    public WeatureInfo getWeatureinfo(String content) {        weatureinfo = new WeatureInfo();        try {            JSONObject js = new JSONObject(content);            JSONObject result =js.getJSONObject("result");            JSONObject sk = result.getJSONObject("sk");            weatureinfo.setTemp(sk.getString("temp"));            JSONObject today = result.getJSONObject("today");            weatureinfo.setCity(today.getString("city"));            weatureinfo.setTemp_range(today.getString("temperature"));            weatureinfo.setTime(today.getString("date_y"));        } catch (JSONException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return weatureinfo;    }}

jsonArray的代码实例：

jsonarray    ["123",123,true,{"username":"gxx","password":123,"age":28},{"username":"gxx","password":123,"age":28},["123","987"]]