android通过httpClient请求获取JSON数据并且解析

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。