使用Apache HttpClient遇到的一些问题

关于客户端用post对象提交，服务端获取post对象中参数。
利用request.getParameter()获取不到参数值，与Content-Type有关系。
如果request.getParameter()获取不到参数值，可以利用request.getInputStream()或request.getReader()来获取。

客户端：
  HttpClient httpClient = new DefaultHttpClient();
            post = new HttpPost(url);
            // 构造消息头
            post.setHeader("Content-type", "application/json; charset=utf-8");
            post.setHeader("Connection", "Close");
            // 构建消息实体
            StringEntity entity = new StringEntity(jsonObj.toString(), Charset.forName("UTF-8"));
            entity.setContentEncoding("UTF-8");
            // 发送Json格式的数据请求
            entity.setContentType("application/json");
            post.setEntity(entity);
            HttpResponse response = httpClient.execute(post);
服务端：
InputStream inputStream = request.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream,"UTF-8"));
            StringBuffer stringBuffer = new StringBuffer();
            String str= "";
            while((str = br.readLine()) != null){
                stringBuffer.append(str);
            }

            JSONObject jsonObject = JSONObject.parseObject(stringBuffer.toString());