如何用HttpClient 以Post方式提交数据并添加http头信息

如何 post json格式的数据，并附加http头，接受返回数据，请看下面的代码：

private void HttpPostData() {  
try {  
    HttpClient httpclient = new DefaultHttpClient();  
    String uri = "http://www.yourweb.com";  
    HttpPost httppost = new HttpPost(uri);   
    //添加http头信息   
    httppost.addHeader("Authorization", "your token"); //认证token   
    httppost.addHeader("Content-Type", "application/json");  
    httppost.addHeader("User-Agent", "imgfornote");  
    //http post的json数据格式：  {"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);  
    //检验状态码，如果成功接收数据   
    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) {   
    }  
}  

 主要用到的类有：org.apache.http.client.HttpClient 、org.apache.http.client.methods.HttpPost 和 org.json.JSONObject