Java对接微信支付预下单

Java对接微信支付

		String spbill_create_ip = PaymentUtils.getIpAddress(request);
        if (!PaymentUtils.isIp(spbill_create_ip)) {
            spbill_create_ip = "127.0.0.1";
        }
		String nonce_str = 1 + CommonUtil.getVerificationCode(15);
        // 微信app支付十个必须要传入的参数
        Map<String, Object> params = new HashMap<>();
        // 商户号
        params.put("mch_id", “mch_id”);
        // 随机字符串
        params.put("nonce_str", nonce_str);
        // 商品描述trade_type
        params.put("body", "App weChat pay!");
        // 商户订单号
        params.put("out_trade_no", order.getOrderSn());
        // 总金额(分)
        params.put("total_fee", 1);
        // 终端IP
        params.put("spbill_create_ip", spbill_create_ip);
        // 通知地址
        params.put("notify_url", appProperties.getWx().getNotify_url());
        // 交易类型:JS_API=公众号支付、NATIVE=扫码支付、APP=app支付
        //type为0时APP支付 type为1时小程序支付
        if (type == 0) {
            params.put("trade_type", "APP");
            // 应用ID
            params.put("appid", appProperties.getWx().getApp_id());
        } else {
            params.put("trade_type", "JSAPI");
            params.put("openid", userService.getInfo().getOpenid());
            params.put("appid", appProperties.getWx().getJsapi_app_id());
        }
        // 签名
        String sign = PaymentUtils.sign(params, appProperties.getWx().getApi_key());
        params.put("sign", sign);

        String xmlData = PaymentUtils.mapToXml(params);
        System.out.println("----------------- >>>>   " + xmlData);

        // 向微信发起预支付
        String wxRetXmlData = HttpUtil.sendPostXml(appProperties.getWx().getCreate_order_url(), xmlData, null);

        Map wxRetMapData = PaymentUtils.xmlToMap(wxRetXmlData);
        Assert.notNull(wxRetMapData, ErrerMsg.ERRER20517.getMessage());
        log.info("weChat pre pay ResponseObj data: {}", wxRetMapData);

        // 封装参数返回App端
        Map<String, Object> responseObj = new HashMap<>();

        String timestamp = String.valueOf(System.currentTimeMillis() / 1000);

		//type=0的时候是对接APP支付
        if (type == 0) {
            responseObj.put("appid", appProperties.getWx().getApp_id());
            responseObj.put("package", "Sign=WXPay");
            responseObj.put("partnerid", appProperties.getWx().getMch_id());
            responseObj.put("prepayid", wxRetMapData.get("prepay_id").toString());
            responseObj.put("noncestr", nonce_str);
            responseObj.put("timestamp", timestamp);
        } else {
        	//type != 0 对接小程序开发
            responseObj.put("appId", appProperties.getWx().getJsapi_app_id());
            responseObj.put("signType", "MD5");
            responseObj.put("package", "prepay_id=" + wxRetMapData.get("prepay_id").toString());
            responseObj.put("nonceStr", nonce_str);
            responseObj.put("timeStamp", timestamp);
        }
        // 对返回给App端的数据进行签名
        responseObj.put("sign", PaymentUtils.sign(responseObj, appProperties.getWx().getApi_key()));

PaymentUtils.sign(Map<String, Object> params, String apiKey)

public static String sign(Map<String, Object> params) {
        StringBuilder sb = new StringBuilder();
        Set<Map.Entry<String, Object>> set = new TreeMap<>(params).entrySet();
        for (Map.Entry<String, Object> entry : set) {
            String k = entry.getKey();
            Object v = entry.getValue();
            sb.append(k).append("=").append(v).append("&");
        }
        String s = sb.toString();
        return Objects.requireNonNull(MD5(s.substring(0, s.length() - 1))).toUpperCase();
    }

PaymentUtils.xmlToMap(String xmlStr)

public static Map<String, String> xmlToMap(String xmlStr) {
        try (InputStream inputStream = new ByteArrayInputStream(xmlStr.getBytes(StandardCharsets.UTF_8))) {
            Map<String, String> data = new HashMap<>();
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document doc = documentBuilder.parse(inputStream);
            doc.getDocumentElement().normalize();
            NodeList nodeList = doc.getDocumentElement().getChildNodes();
            for (int idx = 0; idx < nodeList.getLength(); ++idx) {
                Node node = nodeList.item(idx);
                if (node.getNodeType() == Node.ELEMENT_NODE) {
                    Element element = (Element) node;
                    data.put(element.getNodeName(), element.getTextContent());
                }
            }
            return data;
        } catch (Exception ex) {
            log.warn("xml convert to map failed message: {}", ex.getMessage());
            return null;
        }
    }

PaymentUtils.mapToXml(Map<String, Object> params)

public static String mapToXml(Map<String, Object> params) {
        StringBuilder sb = new StringBuilder();
        Set<Map.Entry<String, Object>> es = params.entrySet();
        Iterator<Map.Entry<String, Object>> it = es.iterator();
        sb.append("<xml>");
        while (it.hasNext()) {
            Map.Entry<String, Object> entry = it.next();
            String k = entry.getKey();
            Object v = entry.getValue();
            sb.append("<").append(k).append(">").append(v).append("</").append(k).append(">");
        }
        sb.append("</xml>");
        return sb.toString();
    }

HttpUtil.sendPostXml(String url, String xml, Map<String, Object> headers)

    public static String sendPostXml(String url, String xml, Map<String, Object> headers) {
        String ResponseObj = null;
        try {
            HttpPost httpPost = new HttpPost(url);
            setHeaders(headers, httpPost);
            StringEntity entity = new StringEntity(xml, StandardCharsets.UTF_8);
            httpPost.addHeader("Content-Type", "text/xml");
            httpPost.setEntity(entity);
            HttpResponse response = httpClient.execute(httpPost);
            HttpEntity responseData = response.getEntity();
            ResponseObj = EntityUtils.toString(responseData, StandardCharsets.UTF_8);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ResponseObj;
    }

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原文链接：Java对接微信支付预下单，转载请注明来源！