支付宝APP支付Java回调具体步骤

/** * 支付宝异步请求通知 * * @param request * @return */@RequestMapping(value = "async", method = RequestMethod.POST)@ResponseBody@Transactional(readOnly = false)public String async(HttpServletRequest request) {    Map<String, String> params = new HashMap<String, String>();    Map requestParams = request.getParameterMap();    for (Iterator iter = requestParams.keySet().iterator(); iter.hasNext(); ) {        String name = (String) iter.next();        String[] values = (String[]) requestParams.get(name);        String valueStr = "";        for (int i = 0; i < values.length; i++) {            valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";        }        System.out.println(">>>>>参数" + name + ":" + valueStr);        params.put(name, valueStr);    }    requestParams.get("trade_status");    String tradeNo = request.getParameter("out_trade_no");    String tradeStatus = request.getParameter("trade_status");    if (AlipayNotify.verify(params)) {//验证成功        if (tradeStatus.equals("TRADE_FINISHED") || tradeStatus.equals("TRADE_SUCCESS")) {            System.out.println(">>>>>状态要更新了");

    //商品交易成功之后的业务逻辑代码

                                   System.out.println(">>>>>下单成功" + tradeNo);        }        return "success";    } else {//验证失败        System.out.println(">>>>>验签失败" + tradeNo);        System.out.println(">>>>>交易被关闭了");        MemberOrder order = this.memberOrderService.get(tradeNo);        this.memberOrderService.updateActualPayAndSurplusPay("0.00", order.getActualPay().toString(), tradeNo);        return "fail";    }}