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：
[java] view plain copy PRint?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”; }
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:
[java] view plain copy print?<%@ page language=“java” contentType=“text/plain; charset=utf-8” pageEncoding=“utf-8”%>{fqs} </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;"><%@ page language="java" contentType="text/plain; charset=utf-8" pageEncoding="utf-8"%>{fqs} struts.xml配置：[java] view plain copy print?<action name=“fqAction*” class=“com.zking.action.FQAcgtion” method=“{1}”> <result name=”dataResult”>/dataResult.jsp</result> <result name=”dataResult”>/dataResultJson.jsp</result> </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
[java] view plain copy print?<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> <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
[java] view plain copy print? [java] view plain copy print?<p><span style=“background-color: rgb(240, 240, 240);”>public class GetJsonActivity extends AppCompatActivity {</span></p><p></p> 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(); } } } 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
[java] view plain copy print?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(); } } } 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?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(); } } } 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(); } }}
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