springboot 实现微信小程序(微信支付)

官方文档 https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_1

申请微信支付前先去申请好微信商户号 https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F

在微信支付里（查看商户号 - 下载相关证书 - 设置key）在以下会用到

public Map<String String>payment(String orderNum){        
System.out.println("【小程序支付】 统一下单开始, 订单金额"+countsum);
        SortedMap<String, String> resultMap = new TreeMap<String, String>();
        Wxchatpayconfig wxchatpayconfig = new Wxchatpayconfig();
        Map<String,String> resMap = this.xcxUnifieldOrder(orderNum, 
         Wxchatpayconfig.TRADE_TYPE_JSAPI, countsum,openId);
        if(SUCCESS.equals(resMap.get("return_code")) && SUCCESS.equals(resMap.get("result_code"))){
            resultMap.put("appId", wxchatpayconfig.getApp_id());
            resultMap.put("timeStamp", PayUtil.getCurrentTimeStamp());
            resultMap.put("nonceStr", PayUtil.makeUUID(32));
            resultMap.put("package", "prepay_id="+resMap.get("prepay_id"));
            resultMap.put("signType", "MD5");
            resultMap.put("sign", PayUtil.createSign(resultMap,wxchatpayconfig.secret));
            resultMap.put("returnCode", "SUCCESS");
            resultMap.put("returnMsg", "OK");
//            System.out.println("【小程序支付】统一下单成功，返回参数:"+resultMap);
        }else{
            resultMap.put("returnCode", resMap.get("return_code"));
            resultMap.put("returnMsg", resMap.get("return_msg"));
            System.out.println("【小程序支付】统一下单失败，失败原因:"+resMap.get("return_msg"));
        }
     return resultMap;
}