Apache Commons: A full-featured Universal Java Component __java Basic Learning

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Apache Commons is an Apache project that provides a full-featured general-purpose Java component.

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The Apache Commons project consists of the following three parts: a functioning project: a reusable set of Java components. Sandbox project: Java Component Development Bench (workspace). Hibernate project: A collection of components currently paused for development. a project that works properly

Commons proper focuses on a principle and goal: to create and maintain reusable Java components. Commons proper is a collaborative, shared place where the Apache community can work together and share with users in a project.

Commons developers will do their best to reduce the dependencies of components and other development libraries, making it easier to deploy these components. In addition, the Commons component will keep the interface as stable as possible, allowing Apache users (including other Apache projects using Commons) to be available without worrying about possible future changes.

The following are the components contained in the Apache Commons:

Component	Description	Latest Version	Release date
BCEL	Bytecode Engineering Development Library: Analyzing, creating, and manipulating Java class files.	5.2	2007-06-14
Beanutils	Packaging for the Java Reflection and Self-Test (introspection) API makes it easier to use.	1.9.2	2014-05-29
BSF	Bean Script Framework: A scripting language framework that includes JSR-233.	3.1	2010-24-06
Chain	Responsibility chain model implementation.	1.2	2008-06-02
Cli	Command-line argument parser.	1.3.1	2015-06-17
Codec	Common codec algorithms (such as phonetic, base64, URLs).	1.10	2014-11-09
Collections	Java Collection framework extensions and enhancements.	4.0	2013-11-24
Compress	APIs that support tar, zip, and bzip2 file operations.	1.10	2015-08-18
Configuration	Read various configurations, preferences from a variety of formats.	2.0-beta1	2015-06-19
Csv	Read and write components that separate values with commas.	1.2	2015-08-24
Daemon	An optional mechanism used to invoke Java-written UNIX daemon programs.	1.0.15	2013-03-04
DBCP	Database connection Pooling service.	2.0.1	2014-05-24
Dbutils	JDBC Help function Library.	1.6	2014-07-20
Digester	A tool that maps XML to Java objects.	3.2	2011-12-13
Discovery	A tool that locates resources through services, references, and mapping to resource names.	0.5	2011-04-28
EL	An expression language parser defined by the JSP 2.0 specification.	1.0	2003-06-18
Email	Use Java to send email.	1.4	2015-05-23
Exec	Use Java to handle external process execution and environment management APIs.	1.3	2014-11-06
FileUpload	Provides file upload capabilities for servlet and Web applications.	1.3.1	2014-02-07
Functor	Functor (functor) is a function that can be used as an object or as an object representing an independent generic function.	N/A	N/A
Imaging (previously called Sanselan)	A library of graphics functions written in pure java.	N/A	N/A
Io	I/O tool collection.	2.4	2012-06-12
Jci	Java compiler interface.	1.1	2013-10-14
Jcs	Java caching System.	1.3	2007-06-05
Jelly	xml-based scripting and processing engines.	1.0	2005-06-16
Jexl	Jstl an extension of an expression language.	2.1.1	2011-12-24
Jxpath	A tool that uses XPath syntax to manipulate Java beans.	1.3	2008-08-14
Lang	Provides additional functionality for classes in Java.lang.	3.4	2015-04-06
Launcher	Cross-platform Java Application Launcher.	1.1	2004-08-22
Logging	Encapsulation of the various log APIs implementations.	1.2	2014-07-11
Math	Lightweight, Word contains mathematical and statistical components.	3.5	2015-04-17
Modeler	Create a model Mbean mechanism that is compatible with the JMX specification.	2.0.1	2007-06-25
Net	Network Tools Collection and protocol implementation.	3.3	2013-06-12
OGNL	An object-graphical navigation language.	N/A	N/A
Pool	Common Object Pool component.	2.4.1	2015-05-30
Primitives	Supports small, fast, and simple implementations of Java base types.	1.0	2003-11-05
Proxy	Create a support library for dynamic agents.	1.0	2008-02-28
Scxml	A state diagram XML specification implementation designed to create and maintain the Java Scxml engine. You can define the state machine and abstract the environment interface through the Scxml document.	0.9	2008-12-01
Validator	A framework for defining validators and validation rules through an XML file.	1.4.1	2014-01-13
Vfs	A virtual file used to process files, FTP, SMB, zip, and type single logical file systems.	2.0	2011-08-24
Weaver	Provides a simple way to enhance (weave into weave) the compiled byte code.	1.1	2014-09-30

Sandbox Project

The Commons project also provides a workbench for all Apache authors. Here you can try a variety of ideas, including porting Commons to another Apache project. Users are free to experiment with components developed in the phase, but the components in the sandbox are not guaranteed to be maintained. List of projects see here. Hibernate Project

These are Commons components that have been deemed inactive since they have the seen little recent activity. If you are wish to use any of the components, you are must build them yourselves. It is best to assume which these components won't be released in the near future.

The Commons component goes into hibernation when there is no active development. If you want to use these components you need to build them yourself. Before using, do a good job in the future will not continue to release the project preparation. List of projects see here. Development Resources
Download JAVADOC: See Modules Home POM mailing list Wiki build steps

Official website: http://commons.apache.org/
Open Source Address: https://github.com/search?utf8=%E2%9C%93&q=Apache+Commons