微信退款

 public PaymentResult refund(String orderNumber,Double payAmount, Double refundAmount, String title, String description) {        JSONObject retJson = new JSONObject();        try {            SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>();//            商户信息（固定）            packageParams.put("appid", APPID);      //公众账号ID            packageParams.put("mch_id", MCHID);     //商户号            packageParams.put("nonce_str", WechatUtils.getNonce_str());      //随机字符串            //需要传递的参数            packageParams.put("out_trade_no", orderNumber);        //商户订单号            packageParams.put("out_refund_no", "TK"+orderNumber);     //商户系统内部的退款单号，商户系统内部唯一，同一退款单号多次请求只退一笔            packageParams.put("total_fee", String.valueOf((long)(payAmount*100)));        //标价金额  订单总金额，单位为分，详见支付金额            packageParams.put("refund_fee", String.valueOf((long)(refundAmount*100)));        //退款金额            packageParams.put("op_user_id", MCHID);//操作人员,默认为商户账号            //生成签名字符串            String sign = PayCommonUtil.createSign("UTF-8", packageParams, KEY);            packageParams.put("sign", sign);    //签名            String requestXML = PayCommonUtil.getRequestXml(packageParams);            KeyStore keyStore  = KeyStore.getInstance("PKCS12");            FileInputStream instream = new FileInputStream(new File("C:/apiclient_cert.p12"));//放退款证书的路径            try {                keyStore.load(instream, MCHID.toCharArray());            } finally {                instream.close();            }            SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, MCHID.toCharArray()).build();            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(                    sslcontext,                    new String[] { "TLSv1" },                    null,                    SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);            log.info("退款请求：" + requestXML);            CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();            try {                HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/secapi/pay/refund");//退款接口                log.info("executing request" + httpPost.getRequestLine());                StringEntity reqEntity  = new StringEntity(requestXML);                // 设置类型                reqEntity.setContentType("application/x-www-form-urlencoded");                httpPost.setEntity(reqEntity);                CloseableHttpResponse chr = httpclient.execute(httpPost);                try {                    HttpEntity entity = chr.getEntity();                    System.out.println("----------------------------------------");                    System.out.println(chr.getStatusLine());                    StringBuffer rspXml = new StringBuffer();                    if (entity != null) {                        System.out.println("Response content length: " + entity.getContentLength());                        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent(),"UTF-8"));                        String text;                        while ((text = bufferedReader.readLine()) != null) {                            rspXml.append(text);                        }                    }                    log.info("退款响应："+rspXml.toString());                    SortedMap map = XmlUtils.parseXmlStr(rspXml.toString());                    EntityUtils.consume(entity);                    PaymentResult result = new PaymentResult();                    result.setPayment(Payment.WeChat);                    if(map.get("result_code").equals("SUCCESS")){                        result.setCode("SUCCESS");                        return result;                    }else {                        result.setCode("FAIL");                        result.setData(map.get("err_code_des").toString());                        return result;                    }                } finally {                    chr.close();                }            } finally {                httpclient.close();            }        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }        return null;    }