code: public static String deCodeFileContent(Map<String, String> resData,String fileDirectory,String encoding) {
  		// 解析返回文件
  		String filePath = null;
  		String fileContent = resData.get(SDKConstants.param_fileContent);
  		if (null != fileContent && !"".equals(fileContent)) {
  			FileOutputStream out = null;
  			try {
  				byte[] fileArray = SDKUtil.inflater(SecureUtil
  						.base64Decode(fileContent.getBytes(encoding)));
  				if (SDKUtil.isEmpty(resData.get("fileName"))) {
  					filePath = fileDirectory + File.separator + resData.get("merId")
  							+ "_" + resData.get("batchNo") + "_"
  							+ resData.get("txnTime") + ".txt";
  				} else {
  					filePath = fileDirectory + File.separator + resData.get("fileName");
  				}
  				File file = new File(filePath);
  				if (file.exists()) {
  					file.delete();
  				}
  				file.createNewFile();
  			    out = new FileOutputStream(file);
  				out.write(fileArray, 0, fileArray.length);
  				out.flush();
  			} catch (UnsupportedEncodingException e) {
  				LogUtil.writeErrorLog(e.getMessage(), e);
  			} catch (IOException e) {
  				LogUtil.writeErrorLog(e.getMessage(), e);
  			}finally{
  				try {
  					out.close();
  				} catch (IOException e) {
  					e.printStackTrace();
  				}
  			}
  		}
  		return filePath;
  	}
docs: 功能：解析交易返回的fileContent字符串并落地 （ 解base64，解DEFLATE压缩并落地）<br>
  适用到的交易：对账文件下载，批量交易状态查询<br>
  @param resData 返回报文map<br>
  @param fileDirectory 落地的文件目录（绝对路径）
  @param encoding 上送请求报文域encoding字段的值<br>