微信支付之H5支付java

H5支付以及場景介紹：https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_1

H5支付是指商戶在微信客戶端外的移動端網頁展示商品或服務，用戶在前述頁面確認使用微信支付時，商戶發起本服務呼起微信客戶端進行支付。

主要用於觸屏版的手機瀏覽器請求微信支付的場景。可以方便的從外部瀏覽器喚起微信支付。

該案列用的是微信官方提供的sdk,首先去微信官方下載sdk，SDK配置可參考

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

去商戶平台配置支付授權域名：

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學費");

            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");
            //把成功后的跳轉頁面進行urlencoding轉碼 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 "";
    }

獲取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;
    }

支付回調函數

    /**
     * 微信支付 回調函數
     */
    public void notifyUrl(HttpServletRequest request) throws Exception {//讀取參數
        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;
        }
        //支付結果通知的xml格式數據
        String notifyData = sb.toString( );
        MyWxPayConfig myWxPayConfig = new MyWxPayConfig( );
        WXPay wxpay = new WXPay(myWxPayConfig);
        Map< String, String > notifyMap = WXPayUtil.xmlToMap(notifyData);

        //驗證簽名是否正確
        if (wxpay.isPayResultNotifySignatureValid(notifyMap)) {
            //支付成功
            if ("SUCCESS".equals(notifyMap.get("result_code"))) {
                //商戶訂單號
                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( );
                //把訂單狀態改成已付款
            } else {
                //log.info("微信支付回調函數：支付失敗");
            }
        } else {
            //log.info("微信支付回調函數：微信簽名錯誤");
        }
    }

常見問題 ： https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_4

效果：在微信外部瀏覽器打開