simple API for presenting, processing and validating a command line interface.

PDFBox是Java实现的PDF文档协作类库，提供PDF文档的创建、处理以及文档内容提取功能，也包含了一些命令行实用工具

Defines an API for working with compression and archive formats. These include: bzip2, gzip, pack200, lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

commons-beanutils 是apache commons子项目中的一个软件包，其主要目的是利用反射机制对JavaBean的属性进行处理

Commons项目中用来处理Java基本对象方法的工具类包，可以简化很多平时经常要用到的写法，例如判断字符串是否为空等等。

Simple encoder and decoders for various formats such as Base64 and Hexadecimal.

Virtual File System library.

Tools to assist in the reading of configuration/preferences files in various formats

a set of utilities and Java support classes for running Java applications as server processes.

Digester基于规则的XML文档解析,主要用于XML到Java对象的映射

contains types that extend and augment the Java Collections Framework.

Apache Commons Weaver 提供了一种通过生成（“weaving”）字节码到这些类中来增强已编译 Java 类的简便方法

The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.

Tika 是一个内容抽取的工具集合(a toolkit for text extracting)。它集成了 POI, Pdfbox 并且为文本抽取工作提供了一个统一的界面。

C++ Component Model