JAVA退款至微信账户

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本文介绍了一种基于微信支付平台的退款流程实现方法。通过调用微信支付提供的退款接口，完成退款业务逻辑。涉及证书加载、HTTPS请求构造及XML数据解析等关键技术。

/**
     *
     * @param orderId       订单id(回写业务逻辑使用)
     * @param ptOrderCode   订单编号
     * @param transactionNo 微信支付返回的流水单号(和订单编号二选一)
     * @param totalFee      退款金额
     * @return
     */
    @Transactional
    public  Object refundPay(Integer orderId,String ptOrderCode,String transactionNo,double totalFee) {
        try{
            KeyStore keyStore = KeyStore.getInstance("PKCS12");
            FileInputStream instream = new FileInputStream("微商城支付平台的证书");
            try {
                keyStore.load(instream, "商户号".toCharArray());
            }finally {
                instream.close();
            }
            SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, "商户号".toCharArray()).build();
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
            HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");
            String xml =wxPayRefund(ptOrderCode,transactionNo,String.valueOf((int)(totalFee*100)));

            try {
                StringEntity se = new StringEntity(xml);
                httppost.setEntity(se);
                CloseableHttpResponse responseEntry = httpclient.execute(httppost);
                try {
                    HttpEntity entity = responseEntry.getEntity();
                    if (entity != null) {
                        JSONObject result = new JSONObject();
                        SAXReader saxReader = new SAXReader();
                        Document document = saxReader.read(entity.getContent());
                        Element rootElt = document.getRootElement();
                        String resultcode ="";
                        String return_msg = rootElt.elementText("return_msg");
                        String err_code = rootElt.elementText("err_code");
                        String err_code_des = rootElt.elementText("err_code_des");
                        String return_code = rootElt.elementText("return_code");
                        resultcode = rootElt.elementText("result_code");
                        if(resultcode.equals("SUCCESS")){
                            result.put("weixinPayUrl", rootElt.elementText("code_url"));
                            result.put("prepayId", rootElt.elementText("prepay_id"));
                            result.put("status","success");
                            result.put("msg","success");
                            //成功，更改订单状态
                            ptOrderDao.upPtOrderStatus(orderId,6);
                        }else{
                            result.put("status","false");
                            result.put("msg",rootElt.elementText("err_code_des"));
                        }
                        return result;
                    }
                    EntityUtils.consume(entity);
                }
                finally {
                    responseEntry.close();
                }

                }
            }
            finally {
                httpclient.close();
            }
            return null;
        }catch(Exception e){
            e.printStackTrace();
            JSONObject result = new JSONObject();
            result.put("status","error");
            result.put("msg",e.getMessage());
            return result;
        }
    }

public  String wxPayRefund(String out_trade_no, String transaction_id,String total_fee) {
        StringBuffer xml = new StringBuffer();
        String data = null;
        try {
            String nonceStr = this.generateOrderNo();//获取随机字符串
            xml.append("</xml>");
            SortedMap<String,String> parameters = new TreeMap<String,String>();
            parameters.put("appid", WeChatConfigs.getAppID());//公众账号ID
            parameters.put("mch_id", WeChatConfigs.getMchID());//商户号
            parameters.put("nonce_str", nonceStr);//随机字符串
            parameters.put("out_trade_no", out_trade_no);//订单号
            //parameters.put("transaction_id", transaction_id);//微信返回的流水单号
            parameters.put("out_refund_no", nonceStr);//退款单号
            parameters.put("fee_type", "CNY");//币总
            parameters.put("total_fee", total_fee);//订单金额
            parameters.put("refund_fee", total_fee);//退款金额
            parameters.put("op_user_id", WeChatConfigs.getMchID());//商户号
            parameters.put("sign", createSign(parameters, WeChatConfigs.getApiSecret()));//API密钥
            data = PayCommonUtil.getRequestXml(parameters);
        } catch (Exception e) {
            System.err.println(e.getMessage());
            return null;
        }
        return data;
    }

public  String createSign(SortedMap<String, String> packageParams, String AppKey) {
        StringBuffer sb = new StringBuffer();
        Set es = packageParams.entrySet();
        Iterator it = es.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
                sb.append(k + "=" + v + "&");
            }
        }
        sb.append("key=" + AppKey);
        String sign = MD5Util.MD5Encode(sb.toString(), "UTF-8").toUpperCase();
        return sign;
    }