/**

     * 发送POST方法的请求

     * @param url 发送请求的 URL

     * @param jsonData 请求参数是Json格式字符串

     * @return 响应结果

     */

    public static String sendPostJsonStr(String url, String jsonData) {

        PrintWriter out = null;

        BufferedReader in = null;

        String result = "";

        try {

            HttpClient client = new HttpClient();

            PostMethod postMethod = new PostMethod(url);

            postMethod.addRequestHeader("Content-type", "application/json; charset=utf-8");

            byte[] requestBytes = jsonData.getBytes("utf-8"); // 将参数转为二进制流

            InputStream inputStream = new ByteArrayInputStream(requestBytes, 0, requestBytes.length);

            // 请求体

            RequestEntity requestEntity = new InputStreamRequestEntity(inputStream, requestBytes.length, "application/json; charset=utf-8");

            postMethod.setRequestEntity(requestEntity); // 将参数放入请求体

            client.executeMethod(postMethod);

            inputStream = postMethod.getResponseBodyAsStream();

            BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));

            StringBuffer stringBuffer = new StringBuffer();

            String str= "";

            while((str = br.readLine()) != null){

                stringBuffer.append(str);

            }

            result=stringBuffer.toString();

        } catch (Exception e) {

            e.printStackTrace();

        }

        finally {

            try {

                if (out != null) {

                    out.close();

                }

                if (in != null) {

                    in.close();

                }

            } catch (IOException ex) {

                ex.printStackTrace();

            }

        }

        return result;

    }