Apache Commons is a very useful toolkit to solve a variety of practical general issues, you will find that they are what you need to think. They are not peerless martial arts, but it is indeed a slap in which Commons is coming, and the problem is coming.
Here is a comprehensive brief address:
Component Description BeanUtilScommons-BeanUTils Provides the Java Reflection and Package BetwixtBetwixt for Java API to provide JavaBean to XML documents, as well as oppositely mapped services. Chain Chain provides a "responsible chain mode" that implements complex processing processes. CLI CLI provides commands Simple APIs, options, option groups, mandatory options, etc. CODEC CODEC contains some universal encoding decoding algorithms. Including some speech encoders, HEX, BASE64, and URL ENCODER. Collections Commons-Collections offer a class package to extend and add standard Java Collection Framework Configuration Commons-Configuration tools to provide read help for all kinds of configurations and reference files DAEMON alternative mechanism for Unix-daemon-like Java code DBCP Commons-DBCP provides database connection pool service DBUTILS DBUTILS is a JDBC Helper class library that completes a simple resource clearance code for database tasks. Digester Commons-Digester is an XML- The map tool for the Java object is used to parse the XML configuration file. DiscoveryCommons-Discovery provides a tool to locate resources (including classes), mapping service / reference names and resource names by using various modes. El Commons-EL is available in JSP2.0 The interpreter of the EL expression defined in the specification. FILEUPLOAD FILEUPLOAD makes it possible to add powerful and high-performance file upload capabilities in your application and servlet. HttpClient Commons-HttpClient provides a framework that can work in the HTTP protocol client. IO IO is an I / O tool set. Jellyjelly is an XML-based script and processing engine. Jelly draws on many advantages of the scripting engine in the JSP definition indicator, Velocity, Cocoon, and XDoclets. Jelly can be used in the command line, Ant or servlet. JEXLJEXL is an expression language that extends JSTL defined expression language by learning from Velocity. JXPathCommons-jxPath provides XPath syntax to manipulate Java class naming specifications JavaBeans tools. Maps, DOMs, and other object models are also supported. Lang Commons-lang provides many common tool class sets, providing extension features in java.lang. LATKA Commons-Latka is an HTTP function test package for automation QA, acceptance and attenuation test. The Launcher Launcher component is a Java application loader of a cross platform. Commons-launcher eliminates the need to batch or shell scripts to load the Java class. The original Java class comes from the Jakarta Tomcat 4.0 project. Logging Commons-logging is a parcel class for a variety of Logging APIs. Math Math is a lightweight, self-contained mathematics and statistical components, solved many very universal but no Practice in the Java standard language. Modeler Commons-Modeler provides a mechanism for modeling the MBean, which is compatible with JMX specification. NetNet is a network toolset, based on NetComponents code, including FTP clients, etc. PoolCommons-pool provides A common object pool interface, a toolkit for creating a modular object pool, as well as the usual object pool implementation. PrimitivesCommons-Primitives provides a smaller, faster and more easier support for Java basic types of support.
It is mainly mainly for basic types of Collection. ValidatorThe Commons-Validator provides a simple, scalable framework to define the validator (check method) and check rules in an XML file. Support for the internationalization of check rules and error messages. Details are: http://jakarta.apache.org/commons/index.html
And Jakarta Commons: Use class and components
