Android网络数据Json格式解析

     上次我们讲到XML解析网络数据，这次我们来研究研究用Json格式解析数据

    照旧，我们先在web端的FQAcgtion.class模拟一组Json格式的数据：

 

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1. public String getJson() throws Exception {  
2.         // 获取数据  
3.         // 调用数据库查询数据，返回对象集合（….）  
4.         List<FQ> fqs = new ArrayList<FQ>();  
5.         for (int i = 1; i <= 100; i++) {  
6.             Calendar calendar = Calendar.getInstance();  
7.             int year = calendar.get(Calendar.YEAR);  
8.             int month = calendar.get(Calendar.MONTH);  
9.             int day = calendar.get(Calendar.DAY_OF_MONTH);  
10.             fqs.add(new FQ(“原生态” + i, “很纯”, year + “-“ + month + “-“ + day));  
11.         }  
12.           
13.         //将对象集合转换为json，例如：{“class”:”150831”,”lists”:30,”fqs”“[{},{},{}]}  
14.         JSONObject jo=new JSONObject();  
15.         jo.put(”clazz”, “150831”);  
16.         jo.put(”lists”, fqs.size());  
17.           
18.         JSONArray ja=new JSONArray();  
19.           
20.         for (FQ fq : fqs) {  
21.             JSONObject jos=new JSONObject();  
22.             jos.put(”name”, fq.getName());  
23.             jos.put(”content”, fq.getContent());  
24.             jos.put(”time”, fq.getTime());  
25.             ja.add(jos);  
26.         }  
27.           
28.         jo.put(”fqs”, ja);  
29.           
30.   
31.         // 将对象集合存放到请求域中  
32. //      ServletActionContext.getRequest().setAttribute(“fqs”, jo.toString());  
33.   
34.         return “dataResultJson”;  
35.     }  
36.       

public String getJson() throws Exception {        // 获取数据        // 调用数据库查询数据，返回对象集合（....）        List<FQ> fqs = new ArrayList<FQ>();        for (int i = 1; i <= 100; i++) {            Calendar calendar = Calendar.getInstance();            int year = calendar.get(Calendar.YEAR);            int month = calendar.get(Calendar.MONTH);            int day = calendar.get(Calendar.DAY_OF_MONTH);            fqs.add(new FQ("原生态" + i, "很纯", year + "-" + month + "-" + day));        }        //将对象集合转换为json，例如：{"class":"150831","lists":30,"fqs""[{},{},{}]}        JSONObject jo=new JSONObject();        jo.put("clazz", "150831");        jo.put("lists", fqs.size());        JSONArray ja=new JSONArray();        for (FQ fq : fqs) {            JSONObject jos=new JSONObject();            jos.put("name", fq.getName());            jos.put("content", fq.getContent());            jos.put("time", fq.getTime());            ja.add(jos);        }        jo.put("fqs", ja);        // 将对象集合存放到请求域中//      ServletActionContext.getRequest().setAttribute("fqs", jo.toString());        return "dataResultJson";    }    

      dataResultJson.jsp:

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1. <%@ page language=“java” contentType=“text/plain; charset=utf-8” pageEncoding=“utf-8”%>{fqs}&nbsp;&nbsp;</span></span></li></ol><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets_01.png"></a></div></div><pre name="code" class="java" style="display: none;">&lt;%@ page language="java" contentType="text/plain; charset=utf-8" pageEncoding="utf-8"%&gt;{fqs}
      struts.xml配置：
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   1. <action name=“fqAction*” class=“com.zking.action.FQAcgtion” method=“{1}”>  
   2.             <result name=”dataResult”>/dataResult.jsp</result>    
   3.             <result name=”dataResult”>/dataResultJson.jsp</result>            
   4.         </action>  

   

   <action name="fqAction*" class="com.zking.action.FQAcgtion" method="{1}">            <result name="dataResult">/dataResult.jsp</result>              <result name="dataResult">/dataResultJson.jsp</result>                  </action>

   
   
   

   
   

       截图如下：

   
   

   
   

   
   

   
   

   
   

           数据模拟好了，那我们现在来Android端拿取数据

          首先，先来个XML页面：依然是一个按钮和一个listview展示数据

         activity_get_json.xml

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   1. <Button  
   2.         android:layout_width=”match_parent”  
   3.         android:layout_height=”wrap_content”  
   4.         android:text=”获取Json”  
   5.         android:onClick=”getJson”  
   6.         />  
   7.   
   8.     <ListView  
   9.         android:layout_width=”match_parent”  
   10.         android:layout_height=”wrap_content”  
   11.         android:id=”@+id/lv_json_list”  
   12.         >  
   13.     </ListView>  

   

   <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="获取Json"        android:onClick="getJson"        />    <ListView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/lv_json_list"        >    </ListView>

   
        XML解析有三种方式，同样Json解析也有三种方式：

   
   

       1、原生态

        activity_get_json.activity

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   1.   

   
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   1. <p><span style=“background-color: rgb(240, 240, 240);”>public class GetJsonActivity extends AppCompatActivity {</span></p><p></p>    private ListView lv_json_list;  
   2.     private List<FQ> lists=new ArrayList<>();  
   3.     private MyAdapter myAdapter;  
   4.     private ProgressDialog progressDialog;  
   5.     @Override  
   6.     protected void onCreate(Bundle savedInstanceState) {  
   7.         super.onCreate(savedInstanceState);  
   8.         setContentView(R.layout.activity_get_json);  
   9.   
   10.         lv_json_list = (ListView) findViewById(R.id.lv_json_list);  
   11.         myAdapter = new MyAdapter();  
   12.         lv_json_list.setAdapter(myAdapter);  
   13.   
   14.         progressDialog = new ProgressDialog(this);  
   15.         progressDialog.setMessage(”正在拼命loading中…”);  
   16.     }  
   17.     class MyAdapter extends BaseAdapter {  
   18.   
   19.         @Override  
   20.         public int getCount() {  
   21.             return lists.size();  
   22.         }  
   23.   
   24.         @Override  
   25.         public Object getItem(int i) {  
   26.             return lists.get(i);  
   27.         }  
   28.   
   29.         @Override  
   30.         public long getItemId(int i) {  
   31.             return i;  
   32.         }  
   33.   
   34.         @Override  
   35.         public View getView(int i, View view, ViewGroup viewGroup) {  
   36.   
   37.             if(view==null){  
   38.                 view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);  
   39.   
   40.                 ItemTag itemTag=new ItemTag();  
   41.   
   42.                 itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);  
   43.                 itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);  
   44.                 itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);  
   45.   
   46.                 view.setTag(itemTag);  
   47.             }  
   48.   
   49.             ItemTag itemTag= (ItemTag) view.getTag();  
   50.             itemTag.tv_name.setText(lists.get(i).getName());  
   51.             itemTag.tv_content.setText(lists.get(i).getContent());  
   52.             itemTag.tv_time.setText(lists.get(i).getTime());  
   53.   
   54.             return view;  
   55.         }  
   56.     }  
   57.   
   58.     public void getJson(View view){  
   59.             new MyTask().execute();  
   60.     }  
   61.   
   62.     class MyTask extends AsyncTask{  
   63.   
   64.         @Override  
   65.         protected void onPreExecute() {  
   66.             super.onPreExecute();  
   67.             progressDialog.show();  
   68.         }  
   69.   
   70.         @Override  
   71.         protected Object doInBackground(Object[] objects) {  
   72.             String path=getString(R.string.server_name)+”fqActiongetJson.action”;  
   73.             try {  
   74.                 URL url=new URL(path);  
   75.                 HttpURLConnection connection= (HttpURLConnection) url.openConnection();  
   76.                 connection.setRequestMethod(”GET”);  
   77.                 connection.setConnectTimeout(5000);  
   78.   
   79.   
   80.                 if(connection.getResponseCode()==200){  
   81.                     InputStream is=connection.getInputStream();  
   82.                     //读  
   83.                     BufferedReader br=new BufferedReader(new InputStreamReader(is));  
   84.                     StringBuffer stringBuffer=new StringBuffer();  
   85.                     String str=null;  
   86.                     while((str=br.readLine())!=null){  
   87.                         stringBuffer.append(str);  
   88.                     }  
   89. //                    Log.i(“test”,stringBuffer.toString());  
   90.   
   91.                     //解析JSOn  
   92.                     //01.原生态  
   93. //                    try {  
   94. //                        JSONObject jsonObject=new JSONObject(stringBuffer.toString());  
   95. //                        String clazz=jsonObject.getString(“class”);  
   96. //                        Log.i(“test”,”class:”+clazz);  
   97. //                        int num=jsonObject.getInt(“lists”);  
   98. //                        Log.i(“test”,”lists:”+num);  
   99. //  
   100. //                        JSONArray jsonArray=jsonObject.getJSONArray(“fqs”);  
   101. //                        for (int i = 0; i <jsonArray.length() ; i++) {  
   102. //                            JSONObject object=jsonArray.getJSONObject(i);  
   103. //                            String name=object.getString(“name”);  
   104. //                            String content=object.getString(“content”);  
   105. //                            String time=object.getString(“time”);  
   106. //                            FQ fq=new FQ(name,content,time);  
   107. //                            lists.add(fq);  
   108. //                        }  
   109. //                    } catch (JSONException e) {  
   110. //                        e.printStackTrace();  
   111. //                    }  
   112.   
   113.   
   114.                       
   115.   
   116.             return null;  
   117.         }  
   118.   
   119.         @Override  
   120.         protected void onPostExecute(Object o) {  
   121.             super.onPostExecute(o);  
   122.   
   123.             myAdapter.notifyDataSetChanged();  
   124.   
   125.             progressDialog.cancel();  
   126.         }  
   127.     }  
   128.   
   129.   
   130. }  

   

   public class GetJsonActivity extends AppCompatActivity {
       private ListView lv_json_list;    private List<FQ> lists=new ArrayList<>();    private MyAdapter myAdapter;    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_get_json);        lv_json_list = (ListView) findViewById(R.id.lv_json_list);        myAdapter = new MyAdapter();        lv_json_list.setAdapter(myAdapter);        progressDialog = new ProgressDialog(this);        progressDialog.setMessage("正在拼命loading中...");    }    class MyAdapter extends BaseAdapter {        @Override        public int getCount() {            return lists.size();        }        @Override        public Object getItem(int i) {            return lists.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            if(view==null){                view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);                ItemTag itemTag=new ItemTag();                itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);                itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);                itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);                view.setTag(itemTag);            }            ItemTag itemTag= (ItemTag) view.getTag();            itemTag.tv_name.setText(lists.get(i).getName());            itemTag.tv_content.setText(lists.get(i).getContent());            itemTag.tv_time.setText(lists.get(i).getTime());            return view;        }    }    public void getJson(View view){            new MyTask().execute();    }    class MyTask extends AsyncTask{        @Override        protected void onPreExecute() {            super.onPreExecute();            progressDialog.show();        }        @Override        protected Object doInBackground(Object[] objects) {            String path=getString(R.string.server_name)+"fqActiongetJson.action";            try {                URL url=new URL(path);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                connection.setRequestMethod("GET");                connection.setConnectTimeout(5000);                if(connection.getResponseCode()==200){                    InputStream is=connection.getInputStream();                    //读                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    StringBuffer stringBuffer=new StringBuffer();                    String str=null;                    while((str=br.readLine())!=null){                        stringBuffer.append(str);                    }//                    Log.i("test",stringBuffer.toString());                    //解析JSOn                    //01.原生态//                    try {//                        JSONObject jsonObject=new JSONObject(stringBuffer.toString());//                        String clazz=jsonObject.getString("class");//                        Log.i("test","class:"+clazz);//                        int num=jsonObject.getInt("lists");//                        Log.i("test","lists:"+num);////                        JSONArray jsonArray=jsonObject.getJSONArray("fqs");//                        for (int i = 0; i <jsonArray.length() ; i++) {//                            JSONObject object=jsonArray.getJSONObject(i);//                            String name=object.getString("name");//                            String content=object.getString("content");//                            String time=object.getString("time");//                            FQ fq=new FQ(name,content,time);//                            lists.add(fq);//                        }//                    } catch (JSONException e) {//                        e.printStackTrace();//                    }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            myAdapter.notifyDataSetChanged();            progressDialog.cancel();        }    }}

   
   
   

         2、GJon解析

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   1. public class GetJsonActivity extends AppCompatActivity {  
   2.   
   3.     private ListView lv_json_list;  
   4.     private List<FQ> lists=new ArrayList<>();  
   5.     private MyAdapter myAdapter;  
   6.     private ProgressDialog progressDialog;  
   7.     @Override  
   8.     protected void onCreate(Bundle savedInstanceState) {  
   9.         super.onCreate(savedInstanceState);  
   10.         setContentView(R.layout.activity_get_json);  
   11.   
   12.         lv_json_list = (ListView) findViewById(R.id.lv_json_list);  
   13.         myAdapter = new MyAdapter();  
   14.         lv_json_list.setAdapter(myAdapter);  
   15.   
   16.         progressDialog = new ProgressDialog(this);  
   17.         progressDialog.setMessage(”正在拼命loading中…”);  
   18.     }  
   19.     class MyAdapter extends BaseAdapter {  
   20.   
   21.         @Override  
   22.         public int getCount() {  
   23.             return lists.size();  
   24.         }  
   25.   
   26.         @Override  
   27.         public Object getItem(int i) {  
   28.             return lists.get(i);  
   29.         }  
   30.   
   31.         @Override  
   32.         public long getItemId(int i) {  
   33.             return i;  
   34.         }  
   35.   
   36.         @Override  
   37.         public View getView(int i, View view, ViewGroup viewGroup) {  
   38.   
   39.             if(view==null){  
   40.                 view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);  
   41.   
   42.                 ItemTag itemTag=new ItemTag();  
   43.   
   44.                 itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);  
   45.                 itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);  
   46.                 itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);  
   47.   
   48.                 view.setTag(itemTag);  
   49.             }  
   50.   
   51.             ItemTag itemTag= (ItemTag) view.getTag();  
   52.             itemTag.tv_name.setText(lists.get(i).getName());  
   53.             itemTag.tv_content.setText(lists.get(i).getContent());  
   54.             itemTag.tv_time.setText(lists.get(i).getTime());  
   55.   
   56.             return view;  
   57.         }  
   58.     }  
   59.   
   60.     public void getJson(View view){  
   61.             new MyTask().execute();  
   62.     }  
   63.   
   64.     class MyTask extends AsyncTask{  
   65.   
   66.         @Override  
   67.         protected void onPreExecute() {  
   68.             super.onPreExecute();  
   69.             progressDialog.show();  
   70.         }  
   71.   
   72.         @Override  
   73.         protected Object doInBackground(Object[] objects) {  
   74.             String path=getString(R.string.server_name)+”fqActiongetJson.action”;  
   75.             try {  
   76.                 URL url=new URL(path);  
   77.                 HttpURLConnection connection= (HttpURLConnection) url.openConnection();  
   78.                 connection.setRequestMethod(”GET”);  
   79.                 connection.setConnectTimeout(5000);  
   80.   
   81.   
   82.                 if(connection.getResponseCode()==200){  
   83.                     InputStream is=connection.getInputStream();  
   84.                     //读  
   85.                     BufferedReader br=new BufferedReader(new InputStreamReader(is));  
   86.                     StringBuffer stringBuffer=new StringBuffer();  
   87.                     String str=null;  
   88.                     while((str=br.readLine())!=null){  
   89.                         stringBuffer.append(str);  
   90.                     }  
   91. //                    Log.i(“test”,stringBuffer.toString());  
   92.   
   93.                     //解析JSOn  
   94.                     
   95.   
   96.                     //02.使用Gson解析json  
   97. //                    Gson gson=new Gson();  
   98. //                    BigFQ bigFQ=gson.fromJson(stringBuffer.toString(),BigFQ.class);  
   99. //  
   100. //                    String clazz=bigFQ.getClazz();  
   101. //                    int num=bigFQ.getLists();  
   102. //  
   103. //                    Log.i(“test”,”clazz ”+clazz+” num:”+num);  
   104. //                    lists.addAll(bigFQ.getFqs());  
   105.   
   106.                   
   107.                 }  
   108.             } catch (MalformedURLException e) {  
   109.                 e.printStackTrace();  
   110.             } catch (IOException e) {  
   111.                 e.printStackTrace();  
   112.             }  
   113.   
   114.   
   115.             return null;  
   116.         }  
   117.   
   118.         @Override  
   119.         protected void onPostExecute(Object o) {  
   120.             super.onPostExecute(o);  
   121.   
   122.             myAdapter.notifyDataSetChanged();  
   123.   
   124.             progressDialog.cancel();  
   125.         }  
   126.     }  
   127.   
   128.   
   129. }  

   

   public class GetJsonActivity extends AppCompatActivity {    private ListView lv_json_list;    private List<FQ> lists=new ArrayList<>();    private MyAdapter myAdapter;    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_get_json);        lv_json_list = (ListView) findViewById(R.id.lv_json_list);        myAdapter = new MyAdapter();        lv_json_list.setAdapter(myAdapter);        progressDialog = new ProgressDialog(this);        progressDialog.setMessage("正在拼命loading中...");    }    class MyAdapter extends BaseAdapter {        @Override        public int getCount() {            return lists.size();        }        @Override        public Object getItem(int i) {            return lists.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            if(view==null){                view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);                ItemTag itemTag=new ItemTag();                itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);                itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);                itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);                view.setTag(itemTag);            }            ItemTag itemTag= (ItemTag) view.getTag();            itemTag.tv_name.setText(lists.get(i).getName());            itemTag.tv_content.setText(lists.get(i).getContent());            itemTag.tv_time.setText(lists.get(i).getTime());            return view;        }    }    public void getJson(View view){            new MyTask().execute();    }    class MyTask extends AsyncTask{        @Override        protected void onPreExecute() {            super.onPreExecute();            progressDialog.show();        }        @Override        protected Object doInBackground(Object[] objects) {            String path=getString(R.string.server_name)+"fqActiongetJson.action";            try {                URL url=new URL(path);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                connection.setRequestMethod("GET");                connection.setConnectTimeout(5000);                if(connection.getResponseCode()==200){                    InputStream is=connection.getInputStream();                    //读                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    StringBuffer stringBuffer=new StringBuffer();                    String str=null;                    while((str=br.readLine())!=null){                        stringBuffer.append(str);                    }//                    Log.i("test",stringBuffer.toString());                    //解析JSOn                    //02.使用Gson解析json//                    Gson gson=new Gson();//                    BigFQ bigFQ=gson.fromJson(stringBuffer.toString(),BigFQ.class);////                    String clazz=bigFQ.getClazz();//                    int num=bigFQ.getLists();////                    Log.i("test","clazz "+clazz+" num:"+num);//                    lists.addAll(bigFQ.getFqs());                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            myAdapter.notifyDataSetChanged();            progressDialog.cancel();        }    }}

   
   
   

        3、FastJson解析

   [java] view plain copy

   print?

   1. public class GetJsonActivity extends AppCompatActivity {  
   2.   
   3.     private ListView lv_json_list;  
   4.     private List<FQ> lists=new ArrayList<>();  
   5.     private MyAdapter myAdapter;  
   6.     private ProgressDialog progressDialog;  
   7.     @Override  
   8.     protected void onCreate(Bundle savedInstanceState) {  
   9.         super.onCreate(savedInstanceState);  
   10.         setContentView(R.layout.activity_get_json);  
   11.   
   12.         lv_json_list = (ListView) findViewById(R.id.lv_json_list);  
   13.         myAdapter = new MyAdapter();  
   14.         lv_json_list.setAdapter(myAdapter);  
   15.   
   16.         progressDialog = new ProgressDialog(this);  
   17.         progressDialog.setMessage(”正在拼命loading中…”);  
   18.     }  
   19.     class MyAdapter extends BaseAdapter {  
   20.   
   21.         @Override  
   22.         public int getCount() {  
   23.             return lists.size();  
   24.         }  
   25.   
   26.         @Override  
   27.         public Object getItem(int i) {  
   28.             return lists.get(i);  
   29.         }  
   30.   
   31.         @Override  
   32.         public long getItemId(int i) {  
   33.             return i;  
   34.         }  
   35.   
   36.         @Override  
   37.         public View getView(int i, View view, ViewGroup viewGroup) {  
   38.   
   39.             if(view==null){  
   40.                 view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);  
   41.   
   42.                 ItemTag itemTag=new ItemTag();  
   43.   
   44.                 itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);  
   45.                 itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);  
   46.                 itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);  
   47.   
   48.                 view.setTag(itemTag);  
   49.             }  
   50.   
   51.             ItemTag itemTag= (ItemTag) view.getTag();  
   52.             itemTag.tv_name.setText(lists.get(i).getName());  
   53.             itemTag.tv_content.setText(lists.get(i).getContent());  
   54.             itemTag.tv_time.setText(lists.get(i).getTime());  
   55.   
   56.             return view;  
   57.         }  
   58.     }  
   59.   
   60.     public void getJson(View view){  
   61.             new MyTask().execute();  
   62.     }  
   63.   
   64.     class MyTask extends AsyncTask{  
   65.   
   66.         @Override  
   67.         protected void onPreExecute() {  
   68.             super.onPreExecute();  
   69.             progressDialog.show();  
   70.         }  
   71.   
   72.         @Override  
   73.         protected Object doInBackground(Object[] objects) {  
   74.             String path=getString(R.string.server_name)+”fqActiongetJson.action”;  
   75.             try {  
   76.                 URL url=new URL(path);  
   77.                 HttpURLConnection connection= (HttpURLConnection) url.openConnection();  
   78.                 connection.setRequestMethod(”GET”);  
   79.                 connection.setConnectTimeout(5000);  
   80.   
   81.   
   82.                 if(connection.getResponseCode()==200){  
   83.                     InputStream is=connection.getInputStream();  
   84.                     //读  
   85.                     BufferedReader br=new BufferedReader(new InputStreamReader(is));  
   86.                     StringBuffer stringBuffer=new StringBuffer();  
   87.                     String str=null;  
   88.                     while((str=br.readLine())!=null){  
   89.                         stringBuffer.append(str);  
   90.                     }  
   91. //                    Log.i(“test”,stringBuffer.toString());  
   92.   
   93.                     //解析JSOn  
   94.                      
   95.                     //03.使用FastJson  
   96.                     BigFQ bigFQ=JSON.parseObject(stringBuffer.toString(),BigFQ.class);  
   97.                     String clazz=bigFQ.getClazz();  
   98.                     int num=bigFQ.getLists();  
   99.   
   100.                     Log.i(”test”,“clazz ”+clazz+“ num:”+num);  
   101.                     lists.addAll(bigFQ.getFqs());  
   102.   
   103.                 }  
   104.             } catch (MalformedURLException e) {  
   105.                 e.printStackTrace();  
   106.             } catch (IOException e) {  
   107.                 e.printStackTrace();  
   108.             }  
   109.   
   110.   
   111.             return null;  
   112.         }  
   113.   
   114.         @Override  
   115.         protected void onPostExecute(Object o) {  
   116.             super.onPostExecute(o);  
   117.   
   118.             myAdapter.notifyDataSetChanged();  
   119.   
   120.             progressDialog.cancel();  
   121.         }  
   122.     }  
   123.   
   124.   
   125. }  

   

   public class GetJsonActivity extends AppCompatActivity {    private ListView lv_json_list;    private List<FQ> lists=new ArrayList<>();    private MyAdapter myAdapter;    private ProgressDialog progressDialog;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_get_json);        lv_json_list = (ListView) findViewById(R.id.lv_json_list);        myAdapter = new MyAdapter();        lv_json_list.setAdapter(myAdapter);        progressDialog = new ProgressDialog(this);        progressDialog.setMessage("正在拼命loading中...");    }    class MyAdapter extends BaseAdapter {        @Override        public int getCount() {            return lists.size();        }        @Override        public Object getItem(int i) {            return lists.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            if(view==null){                view= LayoutInflater.from(GetJsonActivity.this).inflate(R.layout.item_listview,null);                ItemTag itemTag=new ItemTag();                itemTag.tv_content= (TextView) view.findViewById(R.id.tv_item_listview_content);                itemTag.tv_name= (TextView) view.findViewById(R.id.tv_item_listview_name);                itemTag.tv_time= (TextView) view.findViewById(R.id.tv_item_listview_time);                view.setTag(itemTag);            }            ItemTag itemTag= (ItemTag) view.getTag();            itemTag.tv_name.setText(lists.get(i).getName());            itemTag.tv_content.setText(lists.get(i).getContent());            itemTag.tv_time.setText(lists.get(i).getTime());            return view;        }    }    public void getJson(View view){            new MyTask().execute();    }    class MyTask extends AsyncTask{        @Override        protected void onPreExecute() {            super.onPreExecute();            progressDialog.show();        }        @Override        protected Object doInBackground(Object[] objects) {            String path=getString(R.string.server_name)+"fqActiongetJson.action";            try {                URL url=new URL(path);                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                connection.setRequestMethod("GET");                connection.setConnectTimeout(5000);                if(connection.getResponseCode()==200){                    InputStream is=connection.getInputStream();                    //读                    BufferedReader br=new BufferedReader(new InputStreamReader(is));                    StringBuffer stringBuffer=new StringBuffer();                    String str=null;                    while((str=br.readLine())!=null){                        stringBuffer.append(str);                    }//                    Log.i("test",stringBuffer.toString());                    //解析JSOn                    //03.使用FastJson                    BigFQ bigFQ=JSON.parseObject(stringBuffer.toString(),BigFQ.class);                    String clazz=bigFQ.getClazz();                    int num=bigFQ.getLists();                    Log.i("test","clazz "+clazz+" num:"+num);                    lists.addAll(bigFQ.getFqs());                }            } catch (MalformedURLException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);            myAdapter.notifyDataSetChanged();            progressDialog.cancel();        }    }}