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http://www.programcreek.com/2011/08/the-most-widely-used-java-apis/
The Most Widely Used Java Libraries
A typical Java project relies on third-party libraries. This article summarizes the most popular and widely used Java libraries for a variety of different applications. A simple example is also provided for some of them, if it can be found on ProgramCreek.
Java SDK is surely the #1 widely used library. So the focus of this list is the popular third-party libraries. The list may not not perfect, so leave your comment if you think others should be included.
1. Core
Apache Commons Lang – Apache’s library that provides a host of helper utilities for the java.lang API, such as String manipulation, object creation, etc.
Google Guava – Google’s Core library for collections, caching, primitives support, etc. (example)
2. HTML, XML Parser
Jsoup – a convenient library to manipulate HTML. (example)
STaX – Process XML code. (example)
3. Web Frameworks
Spring – an open source application framework and inversion of control container for the Java platform. (example)
Struts 2 – most popular web framework from Apache. (example)
Google Web Toolkit – a development toolkit from Google for building and optimizing complex browser-based applications. (example)
Strips – a presentation framework for building web applications using the latest Java technologies.
Tapestry – component oriented framework for creating dynamic, robust, highly scalable web applications in Java.
Here is a comparison of those frameworks.
4. Chart, Report, Graph
JFreeChart – creates charts such as bar charts, line charts, pie charts, etc.
JFreeReport – creates PDF reports.
JGraphT – create graph that contains a set of nodes connected by edges.
5. Windowing Libraries
Swing – a GUI library from SDK. (example)
SWT – a GUI library from eclipse.
SWT vs. Swing
6. GUI Frameworks
Eclipse RCP. (example)
7. Natural Language Processing
OpenNLP – a library from Apache. (example)
Stanford Parser – a library from Stanford University. (example)
If you are an expert of NLP, here are more tools.
8. Static Analysis
Eclipse JDT – a library from IBM which can manipulate Java source code. (example)
WALA – a library that can process .jar file, i.e., bytecode. (example)
9. JSON
Jackson – a multi-purpose Java library for processing JSON data format. Jackson aims to be the best possible combination of fast, correct, lightweight, and ergonomic for developers.
XStream – a simple library to serialize objects to XML and back again.
Google Gson – a Java library that can be used to convert Java Objects into their JSON representation. (example)
JSON-lib – a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans.
10. Math
Apache Commons Math – provide functions for math and statistics.
11. Logging
Apache Log4j – most popular logging library. (example)
Logback – a successor to the popular log4j project.
The Simple Logging Facade for Java (SLF4J) – a simple facade or abstraction for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time.
12. Office-Complicant
Apache POI – APIs for manipulating various file formats based upon Microsoft’s OLE 2 Compound Document format using pure Java.
Docx4j – a Java library for creating and manipulating Microsoft Open XML (Word docx, Powerpoint pptx, and Excel xlsx) files.
* 1) The list above are based on my own survey combined with personal experience. It is possible that they are not precisely THE MOST popular, but at least well-known.
* 2) I will keep updating this list to make it more complete and accurate. Thanks for your comments.
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