code: protected static InputStream _input(File file) throws IOException {
          if (file.exists())
              return new FileInputStream(file);
          if (Scans.isInJar(file)) {
              NutResource nutResource = Scans.makeJarNutResource(file);
              if (nutResource != null)
                  return nutResource.getInputStream();
          }
          throw new FileNotFoundException(file.toString());
      }
docs: 获取File对象输入流,即使在Jar文件中一样工作良好!! <b>强烈推荐</b>