回调函数


@RequestMapping("/toPay")
  public String toPay(HttpServletRequest request, HttpServletResponse response, Model model){
    System.out.println("toPay success");
    try {
      String orderId = request.getParameter("orderId");
      System.out.println("in toPay,orderId:" + orderId);

      String totalFeeStr = request.getParameter("totalFee");
      Float totalFee = 0.0f;

      if(StringUtils.isNotBlank(totalFeeStr)){
        totalFee = new Float(totalFeeStr);
      }

      //网页授权后获取传递的参数
      //String userId = request.getParameter("userId");   
      String code = request.getParameter("code");
      System.out.println("code:"+code);
      //System.out.println("userId:"+userId);

      //获取统一下单需要的openid
      String openId ="";
      String URL = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="
          + WxPayConfig.appid + "&secret=" + WxPayConfig.appsecret + "&code=" + code + "&grant_type=authorization_code";
      System.out.println("URL:"+URL);
      JSONObject jsonObject = CommonUtil.httpsRequest(URL, "GET", null);
      if (null != jsonObject) {
        openId = jsonObject.getString("openid");
        System.out.println("openId:" + openId);
      }

      //获取openId后调用统一支付接口https://api.mch.weixin.qq.com/pay/unifiedorder
      //随机数 
      //String nonce_str = "1add1a30ac87aa2db72f57a2375d8fec";
      String nonce_str = UUID.randomUUID().toString().replaceAll("-", "");
      //商品描述
      String body = orderId;
      //商户订单号
      String out_trade_no = orderId;
      //订单生成的机器 IP
      String spbill_create_ip = request.getRemoteAddr();
      //总金额
      //TODO
      Integer total_fee = Math.round(totalFee*100);
      //Integer total_fee = 1;

      //商户号
      //String mch_id = partner;
      //子商户号  非必输
      //String sub_mch_id="";
      //设备号   非必输
      //String device_info="";
      //附加数据
      //String attach = userId;
      //总金额以分为单位，不带小数点
      //int total_fee = intMoney;
      //订 单 生 成 时 间   非必输
      //String time_start ="";
      //订单失效时间      非必输
      //String time_expire = "";
      //商品标记   非必输
      //String goods_tag = "";
      //非必输
      //String product_id = "";

      //这里notify_url是 支付完成后微信发给该链接信息，可以判断会员是否支付成功，改变订单状态等。
      String notify_url = baseUrl + "/wx/notifyUrl.do";

      SortedMap<String, String> packageParams = new TreeMap<String, String>();
      packageParams.put("appid", WxPayConfig.appid);
      packageParams.put("mch_id", WxPayConfig.partner);
      packageParams.put("nonce_str", nonce_str);
      packageParams.put("body", body);
      packageParams.put("out_trade_no", out_trade_no);
      packageParams.put("total_fee", total_fee+"");
      packageParams.put("spbill_create_ip", spbill_create_ip);
      packageParams.put("notify_url", notify_url);
      packageParams.put("trade_type", WxPayConfig.trade_type);  
      packageParams.put("openid", openId);  

      RequestHandler reqHandler = new RequestHandler(request, response);
      reqHandler.init(WxPayConfig.appid, WxPayConfig.appsecret, WxPayConfig.partnerkey);

      String sign = reqHandler.createSign(packageParams);
      System.out.println("sign:"+sign);
      String xml="<xml>"+
          "<appid>"+WxPayConfig.appid+"</appid>"+
          "<mch_id>"+WxPayConfig.partner+"</mch_id>"+
          "<nonce_str>"+nonce_str+"</nonce_str>"+
          "<sign>"+sign+"</sign>"+
          "<body><![CDATA["+body+"]]></body>"+
          "<out_trade_no>"+out_trade_no+"</out_trade_no>"+
          "<total_fee>"+total_fee+""+"</total_fee>"+
          "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+
          "<notify_url>"+notify_url+"</notify_url>"+
          "<trade_type>"+WxPayConfig.trade_type+"</trade_type>"+
          "<openid>"+openId+"</openid>"+
          "</xml>";
      System.out.println("xml："+xml);

      String createOrderURL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
      String prepay_id="";
      try {
        prepay_id = WeixinPayUtil.getPayNo(createOrderURL, xml);
        System.out.println("prepay_id:" + prepay_id);
        if(prepay_id.equals("")){
          request.setAttribute("ErrorMsg", "统一支付接口获取预支付订单出错");
          response.sendRedirect("error.jsp");
        }
      } catch (Exception e1) {
        e1.printStackTrace();
      }
      SortedMap<String, String> finalpackage = new TreeMap<String, String>();
      String timestamp = Sha1Util.getTimeStamp();
      String packages = "prepay_id="+prepay_id;
      finalpackage.put("appId", WxPayConfig.appid);
      finalpackage.put("timeStamp", timestamp);
      finalpackage.put("nonceStr", nonce_str);
      finalpackage.put("package", packages);
      finalpackage.put("signType", WxPayConfig.signType);
      String finalsign = reqHandler.createSign(finalpackage);
      System.out.println("/jsapi?appid="+WxPayConfig.appid+"&timeStamp="+timestamp+"&nonceStr="+nonce_str+"&package="+packages+"&sign="+finalsign);

      model.addAttribute("appid", WxPayConfig.appid);
      model.addAttribute("timeStamp", timestamp);
      model.addAttribute("nonceStr", nonce_str);
      model.addAttribute("packageValue", packages);
      model.addAttribute("sign", finalsign);

      model.addAttribute("bizOrderId", orderId);
      model.addAttribute("orderId", orderId);
      model.addAttribute("payPrice", total_fee);
      System.out.println("orderId:---------------"+orderId);
      return "/jsapi";
    } catch (NumberFormatException e) {
      e.printStackTrace();
    }
    return null;
  }