Android-解析Json(1.使用原生态解析,2.使用Gson解析Json,3.FastJson解析)

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解析网络Json文件：

本Demo的Json文件放在Tomcat的ROOT目录下，

首先，写个简单的布局文件：

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"    android:layout_width="match_parent" android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.asus.android_30_parsejson.MainActivity">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="解析Json"        android:onClick="parseJson"        /></RelativeLayout>

其次，在MainActivity中进行解析

注：Gson解析需下载com.google.code.gson:gson:2.8.0架包

FastJson需下载fastjson-1.2.3.jar

否则不可以使用

package com.asus.android_30_parsejson;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import com.alibaba.fastjson.JSON;import com.google.gson.Gson;import org.json.JSONArray;import org.json.JSONObject;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.List;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void parseJson(View view){        new MyTask().execute();    }    class MyTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] params) {            //获取网络Json            try {               //http://192.168.43.231:8080/                URL url=new URL(getString(R.string.server_name)+"persons.json");                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                //设置请求方式                connection.setRequestMethod("GET");                //网络请求超时                connection.setConnectTimeout(5000);                //获取结果码                int code=connection.getResponseCode();                if (code==200){                    InputStream is=connection.getInputStream();                    //测试                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    String str=null;                    StringBuffer stringBuffer=new StringBuffer();                    while((str=br.readLine())!=null){                        stringBuffer.append(str);                    }                    Log.i("test",stringBuffer.toString());                    //开始解析                    //1.使用原生态解析//                    JSONObject jsonObject=new JSONObject(stringBuffer.toString());//                    int list=jsonObject.getInt("list");//                    Log.i("test","长度："+list);////                    JSONArray jsonArray=jsonObject.getJSONArray("persons");////                    for (int i = 0; i <jsonArray.length() ; i++) {//                        JSONObject object=jsonArray.getJSONObject(i);//                        int pid=object.getInt("id");//                        String pname=object.getString("name");//                        int page=object.getInt("age");//                        Log.i("test",pid+" "+pname+" "+page);//                    }                    //2.使用Gson解析Json                    Gson gson=new Gson();                    BigPerson bigPerson=gson.fromJson(stringBuffer.toString(),BigPerson.class);                    Log.i("test",bigPerson.getList()+"");                    List<SmallPerson> persons=bigPerson.getPersons();                        for (SmallPerson person : persons) {                        Log.i("test",person.toString());                    }                    //03.FastJson//                    BigPerson bigPerson= JSON.parseObject(stringBuffer.toString(),BigPerson.class);//                    Log.i("test",bigPerson.getList()+"");//                    List<SmallPerson> persons=bigPerson.getPersons();//                    for (SmallPerson person : persons) {//                        Log.i("test",person.toString());//                    }                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);        }    }}

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