HttpPost 访问网络

String httpUrl = "http://apicn.faceplusplus.com/v2/detection/landmark"; 
            //HttpPost连接对象 
            HttpPost httpRequest = new HttpPost(httpUrl); 
            //使用NameValuePair来保存要传递的Post参数 
            List<NameValuePair> params = new ArrayList<NameValuePair>(); 
            //添加要传递的参数 
            params.add(new BasicNameValuePair("api_key", APIKEY)); 
            params.add(new BasicNameValuePair("api_secret", API_SECRET));
            params.add(new BasicNameValuePair("face_id", faceid));
            //设置字符集 
                HttpEntity httpentity;
                try {
                    httpentity = new UrlEncodedFormEntity(params, "utf-8");

                    httpRequest.setEntity(httpentity); 
                     //取得默认的HttpClient 
                    HttpClient httpclient = new DefaultHttpClient(); 
                    //取得HttpResponse 
                    HttpResponse httpResponse = httpclient.execute(httpRequest);
                    if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) 
                    { 
                        //取得返回的字符串 
                        String strResult = EntityUtils.toString(httpResponse.getEntity()); 
                        sb.append(strResult);
                    } 
                    else
                    { 
                        Log.i("wangchao","请求错误!"); 
                    } 
                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } 
                //请求httpRequest 
                catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }*/
                //HttpStatus.SC_OK表示连接成功