微信支付回调接口，接收通知并回复

wxpay-callback.java

@RequestMapping("callback")
public void callback(HttpServletRequest request, HttpServletResponse response) throws Exception {
    InputStream inputStream =  request.getInputStream();

    //BufferedReader是包装设计模式，性能更搞
    BufferedReader in =  new BufferedReader(new InputStreamReader(inputStream,"UTF-8"));
    StringBuffer sb = new StringBuffer();
    String line ;
    while ((line = in.readLine()) != null){
        sb.append(line);
    }
    in.close();
    inputStream.close();
    Map<String,String> callbackMap = WXPayUtil.xmlToMap(sb.toString());
    System.out.println(callbackMap.toString());

    SortedMap<String,String> sortedMap = WXPayUtil.getSortedMap(callbackMap);

    //判断签名是否正确
    if(WXPayUtil.isCorrectSign(sortedMap,wxPayConfig.getKey())){

        if("SUCCESS".equals(sortedMap.get("result_code"))){

            String outTradeNo = sortedMap.get("out_trade_no");

//                根据流水号查找订单
            VideoOrder dbVideoOrder = videoOrderService.findByOutTradeNo(outTradeNo);

            if(dbVideoOrder != null && dbVideoOrder.getState()==0){  //判断逻辑看业务场景
                VideoOrder videoOrder = new VideoOrder();
                videoOrder.setOpenid(sortedMap.get("openid"));
                videoOrder.setOutTradeNo(outTradeNo);
                videoOrder.setNotifyTime(new Date());
                videoOrder.setState(1);

//                    更新订单信息：支付状态、openid、通知日期
                int rows = videoOrderService.updateVideoOderByOutTradeNo(videoOrder);
                if(rows == 1){ //通知微信订单处理成功
                    response.setContentType("text/xml");
                    response.getWriter().println("success");
                    return;
                }
            }
        }
    }
    //都处理失败
    response.setContentType("text/xml");
    response.getWriter().println("fail");

}