code: public static String enCodeFileContent(String filePath,String encoding){
  		String baseFileContent = "";
  		
  		File file = new File(filePath);
  		if (!file.exists()) {
  			try {
  				file.createNewFile();
  			} catch (IOException e) {
  				LogUtil.writeErrorLog(e.getMessage(), e);
  			}
  		}
  		InputStream in = null;
  		try {
  			in = new FileInputStream(file);
  			int fl = in.available();
  			if (null != in) {
  				byte[] s = new byte[fl];
  				in.read(s, 0, fl);
  				// 压缩编码.
  				baseFileContent = new String(SecureUtil.base64Encode(SDKUtil.deflater(s)),encoding);
  			}
  		} catch (Exception e) {
  			LogUtil.writeErrorLog(e.getMessage(), e);
  		} finally {
  			if (null != in) {
  				try {
  					in.close();
  				} catch (IOException e) {
  					LogUtil.writeErrorLog(e.getMessage(), e);
  				}
  			}
  		}
  		return baseFileContent;
  	}
docs: 功能：将批量文件内容使用DEFLATE压缩算法压缩，Base64编码生成字符串并返回<br>
  适用到的交易：批量代付，批量代收，批量退货<br>
  @param filePath 批量文件-全路径文件名<br>
  @return