常用的apache commons工具，直接使用，便于快速开发

详情 ：http://commons.apache.org/

Components	Description	Latest Version	Released
Attributes	Runtime API to metadata attributes such as doclet tags.	2.2	2006-08-03
BCEL	Byte Code Engineering Library - analyze, create, and manipulate Java class files	5.2	2007-06-14
BeanUtils	Easy-to-use wrappers around the Java reflection and introspection APIs.	1.8.3	2010-03-28
Betwixt	Services for mapping JavaBeans to XML documents, and vice versa.	0.8	2006-12-21
BSF	Bean Scripting Framework - interface to scripting languages, including JSR-223	3.1	2010-24-06
Chain	Chain of Responsibility pattern implemention.	1.2	2008-06-02
CLI	Command Line arguments parser.	1.2	2009-03-19
Codec	General encoding/decoding algorithms (for example phonetic, base64, URL).	1.8	2013-04-28
Collections	Extends or augments the Java Collections Framework.	4.0	2013-11-24
Compress	Defines an API for working with tar, zip and bzip2 files.	1.6	2013-10-26
Configuration	Reading of configuration/preferences files in various formats.	1.10	2013-10-27
CSV	Component for reading and writing comma separated value files.	N/A	N/A
Daemon	Alternative invocation mechanism for unix-daemon-like java code.	1.0.15	2013-03-04
DBCP	Database connection pooling services.	1.4	2010-02-14
DbUtils	JDBC helper library.	1.5	2012-07-20
Digester	XML-to-Java-object mapping utility.	3.2	2011-12-13
Discovery	Tools for locating resources by mapping service/reference names to resource names.	0.5	2011-04-28
EL	Interpreter for the Expression Language defined by the JSP 2.0 specification.	1.0	2003-06-18
Email	Library for sending e-mail from Java.	1.3.2	2013-10-25
Exec	API for dealing with external process execution and environment management in Java.	1.1	2010-10-08
FileUpload	File upload capability for your servlets and web applications.	1.3	2013-03-27
Functor	A functor is a function that can be manipulated as an object, or an object representing a single, generic function.	N/A	N/A
Imaging (previously called Sanselan)	A pure-Java image library.	N/A	N/A
IO	Collection of I/O utilities.	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 engine.	1.0	2005-06-16
Jexl	Expression language which extends the Expression Language of the JSTL.	2.1.1	2011-12-24
JXPath	Utilities for manipulating Java Beans using the XPath syntax.	1.3	2008-08-14
Lang	Provides extra functionality for classes in java.lang.	3.1	2011-11-14
Launcher	Cross platform Java application launcher.	1.1	2004-08-22
Logging	Wrapper around a variety of logging API implementations.	1.1.3	2013-03-21
Math	Lightweight, self-contained mathematics and statistics components.	3.2	2013-04-06
Modeler	Mechanisms to create Model MBeans compatible with JMX specification.	2.0.1	2007-06-25
Net	Collection of network utilities and protocol implementations.	3.3	2013-06-12
OGNL	An Object-Graph Navigation Language	N/A	N/A
Pool	Generic object pooling component.	2.0	2013-11-11
Primitives	Smaller, faster and easier to work with types supporting Java primitive types.	1.0	2003-11-05
Proxy	Library for creating dynamic proxies.	1.0	2008-02-28
SCXML	An implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine. It is capable of executing a state machine defined using a SCXML document, and abstracts out the environment interfaces.	0.9	2008-12-01
Validator	Framework to define validators and validation rules in an xml file.	1.4.0	2012-02-03
VFS	Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.	2.0	2011-08-24
Weaver	Provides an easy way to enhance (weave) compiled bytecode.