public static InputStream postFromHttpClient(String path,
     Map<String, String> params, String encode) throws Exception {
     // 用于存放请求参数
     List<NameValuePair> formparams = new ArrayList<NameValuePair>();
     for (Map.Entry<String, String> entry : params.entrySet()) {
     formparams.add(new BasicNameValuePair(entry.getKey(), entry
     .getValue()));
     }
     UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams,
     encode);
     HttpPost httppost = new HttpPost(path);
     System.out.println(entity.toString());
     httppost.setEntity(entity);
     // 看作是浏览器
     HttpClient httpclient = new DefaultHttpClient(); // 发送post请求
     HttpResponse response = httpclient.execute(httppost);
    
     // return readStream(response.getEntity().getContent());
     System.out.println(response.getEntity().getContent());
     return response.getEntity().getContent();
     }