// 构建下单bean

        final WxPayUnifiedOrderBean unifiedOrderBean = new WxPayUnifiedOrderBean();

        unifiedOrderBean.setAppid(wxPayConfig.getAppId());

        unifiedOrderBean.setMch_id(wxPayConfig.getMchId());

        unifiedOrderBean.setNonce_str(this.getNonceStr(16));

        unifiedOrderBean.setBody("支付");

        unifiedOrderBean.setOut_trade_no(order.getHubOrderNo());

        unifiedOrderBean.setTotal_fee(order.getTotalFee());

        unifiedOrderBean.setSpbill_create_ip(order.getSpbill_create_ip());

        unifiedOrderBean.setNotify_url(this.paymentProperties.getWeixin().getNotify_url());

        unifiedOrderBean.setSign(this.generateSignForPrePayId(unifiedOrderBean, wxPayConfig.getSecret()));

        // 请求统一下单接口

        final WxPayPrePayBean bean = this.requestWx(unifiedOrderBean);

/**

     * 请求统一下单接口

     *

     * @param unifiedOrderBean

     * @return

     */

    private WxPayPrePayBean requestWx(final WxPayUnifiedOrderBean unifiedOrderBean) {

        final XStream xStream = new XStream(new DomDriver("UTF-8", new NoNameCoder()));

        xStream.autodetectAnnotations(true);

        final String postXml = xStream.toXML(unifiedOrderBean);

        // 发送请求

        final HttpHeaders headers = new HttpHeaders();

        final MediaType type = MediaType.parseMediaType("application/x-www-form-urlencoded; charset=UTF-8");

        headers.setContentType(type);

        final HttpEntity<String> requestEntity = new HttpEntity<>(postXml, headers);

        final RestTemplate restTemplate = new RestTemplate();

        final ResponseEntity<String> responseEntity = restTemplate.postForEntity(

                PaymentConstant.WX_PREPARE_ORDER_URL, requestEntity, String.class);

        // 解析请求结果

        final XStream xStreamResult = new XStream(new DomDriver("UTF-8", new NoNameCoder()));

        xStreamResult.processAnnotations(WxPayPrePayBean.class);

        try {

            final String returnStr = new String(responseEntity.getBody().getBytes("ISO-8859-1"), "UTF-8");

            System.out.println(responseEntity.getBody());

            System.out.println(returnStr);

            final WxPayPrePayBean bean = (WxPayPrePayBean) xStreamResult.fromXML(returnStr);

            return bean;

        } catch (final Exception e) {

            e.printStackTrace();

            return null;

        }

    }