接收付款通知消息

编写UnionPayController.java

@RequestMapping("/recvBackResponse")
@ApiOperation("接收银联付款通知")
public void recvBackResponse(HttpServletRequest request, HttpServletResponse response) throws Exception {
    request.setCharacterEncoding("UTF-8");
    HashMap<String, String> reqParam = new HashMap<>();
    Enumeration<String> enumeration = request.getParameterNames();
    while (enumeration.hasMoreElements()) {
        String name = enumeration.nextElement();
        String value = request.getParameter(name);
        reqParam.put(name, value);
    }
    Map<String, String> valideData = null;
    if (!reqParam.isEmpty()) {
        Iterator<Map.Entry<String, String>> it = reqParam.entrySet().iterator();
        valideData = new HashMap<String, String>(reqParam.size());
        while (it.hasNext()) {
            Map.Entry<String, String> e = it.next();
            String key = (String) e.getKey();
            String value = (String) e.getValue();
            value = new String(value.getBytes("UTF-8"), "UTF-8");
            valideData.put(key, value);
        }
    }
    //重要！验证签名前不要修改reqParam中的键值对的内容，否则会验签不过
    if (!acpService.validate(valideData, "UTF-8")) {
        //验签失败，需解决验签问题
        System.out.println("签名验证失败");
        response.setCharacterEncoding("UTF-8");
        Writer writer = response.getWriter();
        writer.write("签名验证失败");
        writer.close();
    } else {
        System.out.println("后端通知签名验证成功");
        String respCode = request.getParameter("respCode");
        String queryId = request.getParameter("queryId");
        String code = request.getParameter("orderId");
        if ("00".equals(respCode)) {
            UpdateWrapper updateWrapper = new UpdateWrapper();
            updateWrapper.eq("code", code);
            updateWrapper.set("status", 2);
            updateWrapper.set("payment_type", 3);
            updateWrapper.set("prepay_id", queryId);
            orderService.update(updateWrapper);
        }
        response.setCharacterEncoding("UTF-8");
        Writer writer = response.getWriter();
        writer.write("ok");
        writer.close();
    }
}