微信支付之H5支付java

H5支付以及场景介绍：https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_1

H5支付是指商户在微信客户端外的移动端网页展示商品或服务，用户在前述页面确认使用微信支付时，商户发起本服务呼起微信客户端进行支付。

主要用于触屏版的手机浏览器请求微信支付的场景。可以方便的从外部浏览器唤起微信支付。

该案列用的是微信官方提供的sdk,首先去微信官方下载sdk，SDK配置可参考

https://www.cnblogs.com/lccsdncnblogs/p/wxpay.html

去商户平台配置支付授权域名：

H5支付

    public String wxPayH5s(HttpServletRequest request) {
        String out_trade_no = System.currentTimeMillis( ) + "";
        try {
            Map< String, String > maps = new HashMap<>( );
            maps.put("out_trade_no", out_trade_no);
            maps.put("spbill_create_ip", getRealIp(request));
            maps.put("total_fee", 1+"");
            maps.put("trade_type", "MWEB");
            maps.put("notify_url", "http://xxxxxx/notifyUrl");
            maps.put("body", "xxxxxxxx学费");

            MyWxPayConfig myWxPayConfig = new MyWxPayConfig( );
            WXPay wxPay = new WXPay(myWxPayConfig);

            Map< String, String > reqData = wxPay.fillRequestData(maps);

            Map< String, String > map = wxPay.unifiedOrder(reqData);
            String mWebUrl = map.get("mweb_url");
            //把成功后的跳转页面进行urlencoding转码 https://www.sojson.com/encodeurl.html
            String redirectUrl = "http%3a%2f%2fpay.soochow-abroad.com%2ftuition%2f";

            mWebUrl += "&redirect_url=" + redirectUrl;

            return mWebUrl;
        } catch (Exception e) {
            e.printStackTrace( );
        }
        return "";
    }

获取ip

    public String getRealIp(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }

支付回调函数

    /**
     * 微信支付 回调函数
     */
    public void notifyUrl(HttpServletRequest request) throws Exception {//读取参数
        BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream( )));
        String line;
        StringBuilder sb = new StringBuilder( );
        while ((line = br.readLine( )) != null) {
            sb.append(line);
        }
        if (StringUtils.isBlank(sb)) {
            return;
        }
        //支付结果通知的xml格式数据
        String notifyData = sb.toString( );
        MyWxPayConfig myWxPayConfig = new MyWxPayConfig( );
        WXPay wxpay = new WXPay(myWxPayConfig);
        Map< String, String > notifyMap = WXPayUtil.xmlToMap(notifyData);

        //验证签名是否正确
        if (wxpay.isPayResultNotifySignatureValid(notifyMap)) {
            //支付成功
            if ("SUCCESS".equals(notifyMap.get("result_code"))) {
                //商户订单号
                String out_trade_no = notifyMap.get("out_trade_no");
                Student order = Student.dao.findFirst("select * from student where wx_order_number = ? ", out_trade_no);
                order.setIspay(1);
                order.setPayMethod(2);
                order.setPayTime(new Date( ));
                order.update( );
                //把订单状态改成已付款
            } else {
                //log.info("微信支付回调函数：支付失败");
            }
        } else {
            //log.info("微信支付回调函数：微信签名错误");
        }
    }

常见问题 ： https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_4

效果：在微信外部浏览器打开