android通过httpClient请求获取JSON数据并且解析

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使用.net创建一个ashx文件，并response.write  json格式

public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/plain";            StringBuilder  jsonBuilder  = new StringBuilder();            jsonBuilder.Append("{\"parent\":");            jsonBuilder.Append("{\"children\":");            jsonBuilder.Append("[");            jsonBuilder.Append("{\"id\":\"11111\",\"title\":\"aaaaaaa\",\"name\":\"111111111aaaaaaaaaa\"},");            jsonBuilder.Append("{\"id\":\"22222\",\"title\":\"bbbbbbb\",\"name\":\"222222222aaaaaaaaaa\"},");            jsonBuilder.Append("{\"id\":\"33333\",\"title\":\"ccccccc\",\"name\":\"33333333aaaaaaaaaa\"}");            jsonBuilder.Append("]}}");             context.Response.Write(jsonBuilder.ToString());        }

android代码

public class HttpClient_Get_Activity extends Activity {   public TextView myTextView = null;   @Override   protected void onCreate(Bundle savedInstanceState) {      // TODO Auto-generated method stub      super.onCreate(savedInstanceState);      this.setContentView(R.layout.httpget_httpclient_activity);           Button btn = (Button)this.findViewById(R.id.button1);      btn.setOnClickListener(new Button.OnClickListener(){          @Override         public void onClick(View v) {              new ReadHttpGet().execute("http://190.160.10.79:7890/handler1.ashx");         }              });   }    class ReadHttpGet extends AsyncTask<Object, Object, Object>    {       @Override      protected Object doInBackground(Object... params) {         // TODO Auto-generated method stub                 HttpGet httpRequest = new HttpGet(params[0].toString());         try         {            HttpClient httpClient = new DefaultHttpClient();            HttpResponse httpResponse = httpClient.execute(httpRequest);                       if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK)            {                String strResult = EntityUtils.toString(httpResponse.getEntity());                return strResult;            }            else            {                return "请求出错";            }         }         catch(ClientProtocolException e)         {                    }         catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();         }                 return null;      }       @Override      protected void onCancelled(Object result) {         // TODO Auto-generated method stub         super.onCancelled(result);      }       @Override      protected void onPostExecute(Object result) {         // TODO Auto-generated method stub         super.onPostExecute(result);                 try         {            //创建一个JSON对象            JSONObject jsonObject = new JSONObject(result.toString()).getJSONObject("parent");            //获取某个对象的JSON数组            JSONArray jsonArray = jsonObject.getJSONArray("children");                       StringBuilder builder = new StringBuilder();                       for(int i = 0; i<jsonArray.length(); i++)            {                //新建一个JSON对象，该对象是某个数组里的其中一个对象                JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i);                               builder.append(jsonObject2.getString("id")); //获取数据                builder.append(jsonObject2.getString("title"));                builder.append(jsonObject2.getString("name"));            }            myTextView.setText(builder.toString());         }         catch (JSONException e) {            // TODO Auto-generated catch block            e.printStackTrace();         }              }       @Override      protected void onPreExecute() {         // TODO Auto-generated method stub         //super.onPreExecute();         Toast.makeText(getApplicationContext(), "开始HTTP GET请求", Toast.LENGTH_LONG).show();      }       @Override      protected void onProgressUpdate(Object... values) {         // TODO Auto-generated method stub         super.onProgressUpdate(values);      }          }}

android中json的浅薄理解

JSONObject 表示形式 {"key" : "value"}

JSONArray 表示形式 [{"key" : "value"},{"key" : "value"},{"key" : "value"}]，JSONArray里面包含多个JSONObject

访问时通过 JSONObject对象去访问，使用 jsonObject.getXXX("key")得到相应的值

一般解析JSON都使用这两个。

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