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[转载]android通过httpClient请求获取JSON数据并且解析 – KimhillZhang – 博客园.
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。
