Android 如何用HttpClient 以Post方式提交數據并添加http頭信息

如何 post json格式的數據，并附加http頭，接受返回數據，請看下面的代碼：

private void HttpPostData() {
try {
    HttpClient httpclient = new DefaultHttpClient();
    String uri = "http://www.yourweb.com";
    HttpPost httppost = new HttpPost(uri); 
    //添加http頭信息
    httppost.addHeader("Authorization", "your token"); //認證token
    httppost.addHeader("Content-Type", "application/json");
    httppost.addHeader("User-Agent", "imgfornote");
    //http post的json數據格式：  {"name": "your name","parentId": "id_of_parent"}
    JSONObject obj = new JSONObject();
    obj.put("name", "your name");
    obj.put("parentId", "your parentid");
    httppost.setEntity(new StringEntity(obj.toString()));   
    HttpResponse response;
    response = httpclient.execute(httppost);
    //檢驗狀態碼，如果成功接收數據
    int code = response.getStatusLine().getStatusCode();
    if (code == 200) { 
        String rev = EntityUtils.toString(response.getEntity());//返回json格式： {"id": "27JpL~j4vsL0LX00E00005","version": "abc"}       
        obj = new JSONObject(rev);
        String id = obj.getString("id");
        String version = obj.getString("version");
    }
    } catch (ClientProtocolException e) {   
    } catch (IOException e) {   
    } catch (Exception e) { 
    }
}