Apache Velocity
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For the Microsoft project codenamed Velocity, see Velocity (memory cache).
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This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations. (March 2010) |
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| Developer(s) | Apache Software Foundation |
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| Stable release | 1.7 / November 29, 2010 |
| Development status | Active |
| Written in | Java |
| Operating system | Cross-platform |
| Type | template engine |
| License | Apache License 2.0 |
| Website | http://velocity.apache.org/ |
Apache Velocity (formerly known as Jakarta Velocity) is an open source software project directed by the Apache Software Foundation. Velocity is a Java-based template engine that provides a simple yet powerful template language to reference objects defined in Java code. Its aim is to ensure clean separation between the presentation tier and business tiers in a Web application (the model–view–controller design pattern).
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[edit] Uses
Some common types of applications that use Velocity are:
- Web applications: Web designers create HTML pages with placeholders for dynamic information. The page is processed with VelocityViewServlet or any of a number of frameworks which support Velocity.
- Source code generation: Velocity can be used to generate Java source code, SQL, or PostScript, based on templates. A number of open source and commercial development software packages use Velocity in this manner.[1]
- Automatic emails: Many applications generate automatic emails for account signup, password reminders, or automatically sent reports. Using Velocity, the email template can be stored in a text file, rather than directly embedded in Java code.
- XML transformation: Velocity provides an Ant task, called Anakia, which reads an XML file and makes it available to a Velocity template. A common application is to convert documentation stored in a generic "xdoc" format into a styled HTML document.
[edit] Code example
The following template:
## Velocity Hello World <html> <body> #set( $foo = "Velocity" ) ## followed by Hello $foo World! </body> </html>
processed by Velocity will produce the following text:
<html> <body> Hello Velocity World! </body> </html>
The syntax and overall concept of the Apache Velocity templates is very similar to the syntax of the older WebMacro template engine which is now also an open source project.[citation needed]
[edit] See also
[edit] References
- ^ "PoweredByVelocity". Velocity Wiki. Wiki.apache.org. 2009-12-30. http://wiki.apache.org/velocity/PoweredByVelocity. Retrieved 2010-03-29.
[edit] Bibliography
- Harrop, Rob; Darwin, Ian (August 30, 2004), Pro Jakarta Velocity: From Professional to Expert (1st ed.), Apress, p. 370, ISBN 978-1590594100, http://www.apress.com/book/view/9781590594100
- Cole, Jim; D. Gradecki, Joseph (July 16, 2003), Mastering Apache Velocity (1st ed.), Wiley, p. 372, ISBN 978-0471457947, http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471457949.html
[edit] External links
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