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。

contains types that extend and augment the Java Collections Framework.

Virtual File System library.

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

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.

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

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

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

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

IHub 组件库

Java 开发常用工具集。支持Java6+，提供了大量常用工具，对Guava、Apache Commons等工具做了大量的补充，此外还提供了很多新特性

sofa-common-tools 是 SOFAStack 中间件依赖的一个通用工具包，通过自动感知应用的日志实现，提供中间件与应用隔离的日志空间打印能力

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

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

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