本文介绍了Apache Commons项目中的一系列实用工具组件，包括BeanUtils、Betwixt、Chain等，这些工具为Java开发者提供了丰富的功能，如操作Java Bean、XML映射、命令行解析、文件上传等。
Components
On this wiki:
BeanUtils - Utilities for manipulating java beans, including copying properties, cloning, invoking methods and type conversion.
Betwixt - Services for mapping JavaBeans to XML documents, and vice versa.
Chain - A "Chain of Responsibility" pattern implemention for organizing complex processing flows.
CLI - Command Line Interface library for processing command-line options and arguments.
Codec - General encoding/decoding algorithms. Includes some phonetic encoders, Hex, Base64, and a URL encoder.
Collections - Builds upon the Java Collections Framework of List, Set and Map to provide many more implementations, new collections and abstract base classes.
Configuration - Tools to assist in the reading of configuration/preferences files in various formats
Daemon - Run (java) applications as windows service or UNIX daemon.
DBCP - Database connection pooling services.
Digester - An XML-to-Java-object mapping utility commonly used for parsing XML configuration files.
Email - Simplify email sending with Java. Built on top of the Java Mail API.
FileUpload - Makes it easy to add robust, high-performance, file upload capability to your servlets and web applications
HttpClient - A framework for working with the client-side of the HTTP protocol.
IO - Utility classes, stream implementations, file filters and endian classes to assist in input/output operations.
JCI - Java Compiler Interface
JEXL - A velocity-esque expression interpreter
Jelly - An XML-based scripting language
JXPath - Facilities for applying xpath expressions to graphs of objects of all kinds: Java beans, Maps, Servlet contexts, DOM etc.
Lang - Common utilities that should be provided by the JDK, including String handling, Object and Date helpers, nested exceptions and enumerated types.
Launcher - A cross platform Java application launcher which eliminates the need for a batch or shell script to launch a Java class.
Logging A thin, modular bridging API with out-of-the-box support for the most well known logging systems.
Math Lightweight, self-contained mathematics and statistics components.
Modeler Mechanisms to create Model MBeans compatible with the Java Management Extensions (JMX) specification.
Net - A collection of classes implementing various network protocols such as FTP, NNTP, SMTP, Telnet.
Pool - A generic object pooling interface, a toolkit for creating modular object pools and several general purpose pool implementations.
SCXML - A Java implementation of State Chart XML (SCXML), currently a W3C Working Draft.
Transaction - Utility classes commonly used in transactional programming
Validator - Components for user input validation
VFS - Extensible framework to acces various filesystems through an unified api with implementations for e.g. sftp, smb, http, zip, ...
On the commons site:
http://commons.apache.org/components.html
On this wiki:
BeanUtils - Utilities for manipulating java beans, including copying properties, cloning, invoking methods and type conversion.
Betwixt - Services for mapping JavaBeans to XML documents, and vice versa.
Chain - A "Chain of Responsibility" pattern implemention for organizing complex processing flows.
CLI - Command Line Interface library for processing command-line options and arguments.
Codec - General encoding/decoding algorithms. Includes some phonetic encoders, Hex, Base64, and a URL encoder.
Collections - Builds upon the Java Collections Framework of List, Set and Map to provide many more implementations, new collections and abstract base classes.
Configuration - Tools to assist in the reading of configuration/preferences files in various formats
Daemon - Run (java) applications as windows service or UNIX daemon.
DBCP - Database connection pooling services.
Digester - An XML-to-Java-object mapping utility commonly used for parsing XML configuration files.
Email - Simplify email sending with Java. Built on top of the Java Mail API.
FileUpload - Makes it easy to add robust, high-performance, file upload capability to your servlets and web applications
HttpClient - A framework for working with the client-side of the HTTP protocol.
IO - Utility classes, stream implementations, file filters and endian classes to assist in input/output operations.
JCI - Java Compiler Interface
JEXL - A velocity-esque expression interpreter
Jelly - An XML-based scripting language
JXPath - Facilities for applying xpath expressions to graphs of objects of all kinds: Java beans, Maps, Servlet contexts, DOM etc.
Lang - Common utilities that should be provided by the JDK, including String handling, Object and Date helpers, nested exceptions and enumerated types.
Launcher - A cross platform Java application launcher which eliminates the need for a batch or shell script to launch a Java class.
Logging A thin, modular bridging API with out-of-the-box support for the most well known logging systems.
Math Lightweight, self-contained mathematics and statistics components.
Modeler Mechanisms to create Model MBeans compatible with the Java Management Extensions (JMX) specification.
Net - A collection of classes implementing various network protocols such as FTP, NNTP, SMTP, Telnet.
Pool - A generic object pooling interface, a toolkit for creating modular object pools and several general purpose pool implementations.
SCXML - A Java implementation of State Chart XML (SCXML), currently a W3C Working Draft.
Transaction - Utility classes commonly used in transactional programming
Validator - Components for user input validation
VFS - Extensible framework to acces various filesystems through an unified api with implementations for e.g. sftp, smb, http, zip, ...
On the commons site:
http://commons.apache.org/components.html
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