String merId = req.getParameter("merId");

              String settleDate = req.getParameter("settleDate");

              Map<String, String> data = new HashMap<String, String>();

              /***银联全渠道系统，产品参数，除了encoding自行选择外其他不需修改***/

              data.put("version", DemoBase.version);               //版本号 全渠道默认值

              data.put("encoding", DemoBase.encoding);             //字符集编码 可以使用UTF-8,GBK两种方式

              data.put("signMethod", SDKConfig.getConfig().getSignMethod()); //签名方法

              data.put("txnType", "76");                           //交易类型 76-对账文件下载

              data.put("txnSubType", "01");                        //交易子类型 01-对账文件下载

              data.put("bizType", "000000");                       //业务类型，固定

              /***商户接入参数***/

              data.put("accessType", "0");                         //接入类型，商户接入填0，不需修改

              data.put("merId", merId);                            //商户代码，请替换正式商户号测试，如使用的是自助化平台注册的777开头的商户号，该商户号没有权限测文件下载接口的，请使用测试参数里写的文件下载的商户号和日期测。如需777商户号的真实交易的对账文件，请使用自助化平台下载文件。

              data.put("settleDate", settleDate);                  //清算日期，如果使用正式商户号测试则要修改成自己想要获取对账文件的日期， 测试环境如果使用700000000000001商户号则固定填写0119

              data.put("txnTime",DemoBase.getCurrentTime());       //订单发送时间，取系统时间，格式为YYYYMMDDhhmmss，必须取当前时间，否则会报txnTime无效

              data.put("fileType", "00");                          //文件类型，一般商户填写00即可

              /**请求参数设置完毕，以下对请求参数进行签名并发送http post请求，接收同步应答报文------------->**/

              Map<String, String> reqData = AcpService.sign(data,DemoBase.encoding);                        //报文中certId,signature的值是在signData方法中获取并自动赋值的，只要证书配置正确即可。

              String url = SDKConfig.getConfig().getFileTransUrl();                                                                  //获取请求银联的前台地址：对应属性文件acp_sdk.properties文件中的acpsdk.fileTransUrl

              Map<String, String> rspData = AcpService.post(reqData, url,DemoBase.encoding);

              /**对应答码的处理，请根据您的业务逻辑来编写程序,以下应答码处理逻辑仅供参考------------->**/

              //应答码规范参考open.unionpay.com帮助中心 下载  产品接口规范  《平台接入接口规范-第5部分-附录》

              String fileContentDispaly = "";

              if(!rspData.isEmpty()){

                     if(AcpService.validate(rspData, DemoBase.encoding)){

                            LogUtil.writeLog("验证签名成功");

                            String respCode = rspData.get("respCode");

                            if("00".equals(respCode)){

                                   //交易成功，解析返回报文中的fileContent并落地

                                   String zipFilePath = AcpService.deCodeFileContent(rspData,"d:\",DemoBase.encoding);

                                   //对落地的zip文件解压缩并解析

                                   String outPutDirectory ="d:\";

                                   List<String> fileList = DemoBase.unzip(zipFilePath, outPutDirectory);

                                   //解析ZM，ZME文件

                                   for(String file : fileList){

                                          if(file.indexOf("ZM_")!=-1){

                                                 List<Map> ZmDataList = DemoBase.parseZMFile(file);

                                                 fileContentDispaly = DemoBase.getFileContentTable(ZmDataList,file);

                                          }else if(file.indexOf("ZME_")!=-1){

                                                 DemoBase.parseZMEFile(file);

                                          }

                                   }

                                   //TODO

                            }else{

                                   //其他应答码为失败请排查原因

                                   //TODO

                            }

                     }else{

                            LogUtil.writeErrorLog("验证签名失败");

                            //TODO 检查验证签名失败的原因

                     }

              }else{

                     //未返回正确的http状态

                     LogUtil.writeErrorLog("未获取到返回报文或返回http状态码非200");

              }

              String reqMessage = DemoBase.genHtmlResult(reqData);

              String rspMessage = DemoBase.genHtmlResult(rspData);

              //对账文件内容

              resp.getWriter().write("</br>请求报文:<br/>"+reqMessage+"<br/>" + "应答报文:</br>"+rspMessage+"</br>"+fileContentDispaly);

LogUtil.writeLog("BackRcvResponse接收后台通知开始");

              String encoding = req.getParameter(SDKConstants.param_encoding);

              // 获取银联通知服务器发送的后台通知参数

              Map<String, String> reqParam = getAllRequestParam(req);

              LogUtil.printRequestLog(reqParam);

              Map<String, String> valideData = null;

              if (null != reqParam && !reqParam.isEmpty()) {

                     Iterator<Entry<String, String>> it = reqParam.entrySet().iterator();

                     valideData = new HashMap<String, String>(reqParam.size());

                     while (it.hasNext()) {

                            Entry<String, String> e = it.next();

                            String key = (String) e.getKey();

                            String value = (String) e.getValue();

                            valideData.put(key, value);

                     }

              }

              //重要！验证签名前不要修改reqParam中的键值对的内容，否则会验签不过

              if (!AcpService.validate(valideData, encoding)) {

                     LogUtil.writeLog("验证签名结果[失败].");

                     //验签失败，需解决验签问题

              } else {

                     LogUtil.writeLog("验证签名结果[成功].");

                     //交易成功，更新商户订单状态

                     String orderId =valideData.get("orderId"); //获取后台通知的数据，其他字段也可用类似方式获取

                     String customerInfo = valideData.get("customerInfo");

                     if(null!=customerInfo){

                           Map<String,String>  customerInfoMap = AcpService.parseCustomerInfo(customerInfo, "UTF-8");

                            LogUtil.writeLog("customerInfoMap明文: "+ customerInfoMap);

                     }

                     String accNo = valideData.get("accNo");

                     //如果配置了敏感信息加密证书，可以用以下方法解密

                     if(null!=accNo){

                            accNo = AcpService.decryptData(accNo, "UTF-8");

                            LogUtil.writeLog("accNo明文: "+ accNo);

                     }

                     String respCode = valideData.get("respCode");

                     //判断respCode=00、A6后，对涉及资金类的交易，请再发起查询接口查询，确定交易成功后更新数据库。

              }

              LogUtil.writeLog("BackRcvResponse接收后台通知结束");

              //返回给银联服务器http 200状态码

              resp.getWriter().print("ok");