Commons BeanUtils
A toolset for Beans. Since beans are often composed of a bunch of get and set, BeanUtils also performs some packaging on this basis.
A more commonly used function is Bean Copy, which is to copy the properties of a bean. It will be used if you are developing a layered architecture, such as copying data from PO (Persistent Object) to VO (Value Object).
Commons Codec
It is an encoding and decoding component that provides commonly used encoding and decoding methods, such as DES, SHA1, MD5, Base64, URL and Soundx, etc.
Commons Collections
It is a collection component that extends the Java standard Collections API. It encapsulates, abstracts and supplements commonly used collection operations, greatly simplifying the code while ensuring performance.
Commons Compress
It is a component that compresses and decompresses files and can operate compressed files in rar, cpio, Unix dump, tar, zip, gzip, XZ, Pack200 and bzip2 formats.
Commons Configuration
It is a configuration management tool for Java applications that can load configuration information from properties or xml files.
Commons CSV
It is a Java class library used to read and write various Comma Separated Value (CSV) format files.
Commons Daemon
Realize turning ordinary Java applications into background services of the system. For example, Tomcat uses this project to start and stop as a service on Linux and Windows.
Commons DBCP
Database connection pool.
Commons DBUtils
It is a JDBC tool component that re-encapsulates the traditional classes for operating databases and can convert the result set into a List.
Commons Digester
is a toolset for mapping XML to Java objects.
Commons Email
It is a mail operation component that encapsulates the Java Mail API, provides commonly used mail sending and receiving classes, and simplifies mail operations. This component relies on the Java Mail API.
Commons Exec
Provides some common methods for executing external processes, such as executing exe files or command lines.
Commons FileUpload
Provide file upload function for Web applications or Servlets, file upload components of Struts2 and SpringMVC.
Commons IO
It is a tool class package for processing IO. It extends http://java.io and provides more convenient IO operations.
Commons JCI
Provides a common Java compiler interface.
Commons Lang3
It is a tool class package for processing Java basic object methods. This class package provides operations on basic objects such as characters and arrays, making up for the shortcomings of the basic processing methods of java.lang api.
Commons Launcher
Java applications that can be launched independently across platforms.
Commons Logging
Provide a unified log interface that is lightweight and does not depend on specific implementations. The class package gives middleware/logging tool developers a simple log operation abstraction, allowing program developers to use different specific log implementation tools.
Commons Math
A lightweight self-container package for mathematical and statistical calculation methods, including most commonly used numerical algorithms.
Commons Net
It encapsulates clients of various network protocols and supports FTP, NNTP, SMTP, POP3, Telnet and other protocols.
Commons Pool
Provides a complete set of frameworks for implementing object pooling, as well as several unique object pool implementations, which can effectively reduce the workload when processing object pooling. Class packages are used to improve the calling efficiency of large objects such as file handles, database connections, and socket communications. Simply put, it is a technology that creates objects once and uses them multiple times.
Commons Primitives
Provides a smaller, faster, and easier-to-use support for Java's primitive types.
Commons Validator
Provides a simple, extensible framework to define validators (validation methods) and validation rules in an XML file. Supports internationalization of validation rules and error messages.
Apache HttpClient
It was once a sub-project of Apache Commons and later became independent. HttpClient simplifies various communications between HTTP clients and servers and implements the functions of HTTP client programs (that is, browser programs).
Guava
Google utility library.
FastJson
Efficient Json processing library.
Orika
Efficient Bean mapping framework.
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