下單API文件：https://open.swiftpass.cn/openapi/doc?index_1=187&index_2=1&chapter_1=2328&chapter_2=2329

基本流程：1.前臺攜帶基本資訊金額等。調取後臺與下單並返回一個支付二維碼

　　　　 2.成功支付回撥設定好的介面，完成下單操作

1.獲取二維碼圖片地址連結

/**
 * <一句話功能簡述>
 * <功能詳細描述>測試支付
 *
 * @author Administrator
 * @version [版本號, 2018-2-01]
 * @see [相關類/方法]
 * 
 
@since [產品/模組版本]
 */
public class PayUtils extends HttpServlet {

    private final static String sign_type = "";加密方式
    private static final String notify_url = "";//支付成功後回撥地址
    private static final String mch_id = "";//商戶號
    private static final String req_url = "";//請求威富通地址
    private static final String swiftpassKey = "";//加密鹽


    
 
public static Map pay(int money, String orderId) throws IOException {


        SortedMap<String, String> map = new TreeMap<String, String>();

        map.put("mch_id", mch_id);
        map.put("service", "unified.trade.native");
        map.put("nonce_str", String.valueOf(System.currentTimeMillis()));
        map.put(
 
"out_trade_no", orderId);
        map.put("body", );//在支付頁面會顯示的資訊
        map.put("total_fee", String.valueOf(money * 100));
        map.put("mch_create_ip", InetAddress.getLocalHost().getHostName());
        map.put("notify_url", notify_url);
        map.put("nonce_str", String.valueOf(System.currentTimeMillis()));
        map.put("sign_type", sign_type);

        //map.put("device_info", "pos001");//終端裝置號，商戶自定義。特別說明：對於QQ錢包支付，此引數必傳，否則會報錯。
        Map<String, String> params = SignUtils.paraFilter(map);

        StringBuilder buf = new StringBuilder((params.size() + 1) * 10);
        SignUtils.buildPayParams(buf, params, false);
        String preStr = buf.toString();
        String sign = MD5.sign(preStr, "&key=" + swiftpassKey, "utf-8");
        map.put("sign", sign);

        System.out.println("請求xml：" + XmlUtils.toXml(map));
        String reqUrl = req_url;
        System.out.println("reqUrl：" + reqUrl);

        System.out.println("reqParams:" + XmlUtils.parseXML(map));
        CloseableHttpResponse response = null;
        CloseableHttpClient client = null;
        try {
            HttpPost httpPost = new HttpPost(reqUrl);
            StringEntity entityParams = new StringEntity(XmlUtils.parseXML(map), "utf-8");
            httpPost.setEntity(entityParams);
            client = HttpClients.createDefault();
            response = client.execute(httpPost);
            if (response != null && response.getEntity() != null) {
                Map<String, String> resultMap = XmlUtils.toMap(EntityUtils.toByteArray(response.getEntity()), "utf-8");
                return resultMap;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (response != null) {
                response.close();
            }
            if (client != null) {
                client.close();
            }
        }
        return null;
    }
}

處理返回結果

    JSONObject json = (JSONObject) JSONObject.parse(res);

        if (json != null && json.size() > 0) {
            result.setResult(new Result(true, json.get("data")));
            return result;
        }
        result.setResult(new Result(false, "url獲取失敗"));

2.回撥介面處理

/**
     * @description:威富通支付後回撥介面
     * @author:hdh
     * @date:2020/7/24 15:17
     **/
    @RequestMapping("")
    @ResponseBody
    public String confirmPay(@RequestBody Map map) {
return "success";
    }

3.開發Demo和utils下載地址

https://open.swiftpass.cn/openapi/doc?index_1=187&index_2=1&chapter_1=2337&chapter_2=2340