SiteMesh 2.4.1

SiteMesh will aid in creating large sites consisting of many pages for which a consistent look/feel, navigation and layout scheme is required.
SiteMesh intercepts requests to any static or dynamically generated HTML page requested through the web-server, parses the page, obtains properties and data from the content and generates an appropriate final page with modifications to the original. This is based upon the well-known GangOfFour Decorator design pattern.
SiteMesh can also include entire HTML pages as a Panel within another page. This is similar to a Server-Side Include, except that the HTML document will be modified to create a visual window (using the documents Meta-data as an aid) within a page. Using this feature, Portal type web sites can be built very quickly and effectively. This is based upon the well-known GangOfFour Composite design pattern.
SiteMesh is built using Java 2 with Servlet, JSP and XML technologies. This makes SiteMesh ideal for use with J2EE applications, however it can be integrated with server-side web architectures that are not Java based such as Cold Fusion, CGI (Perl/Python/C/C++/etc), PHP, etc...
SiteMesh is very extensible and is designed in a way in which it is easy to extend for custom needs.

Main features:
Java:
- Built with Java, the industry standard for enterprise applications.
- Conform to the Java Servlet 2.3 specification (final release).
Open Source:
- Open source software distributed under the OpenSymphony Software License (derived and fully compatible with the Apache Software License).
Simple:
- Non-technical users can now create professional Web pages while effortlessly maintaining a consistent look-and-feel across your web-application.
- Dramatically reduces the time needed to develop and maintain a web-application.
- Eliminates the need to create multiple web-apps for different audiences by allowing the decorator to be changed according to the useragent or a request parameter(s) (e.g. printable version).
Very flexible:
- A printable version of your entire site is only a matter of minutes!
- Map a decorator based on a cookie value.
- With the RobotDecoratorMapper you can apply a special decorator to all your pages when they are indexed by a search engine robot (also known as spider, crawler). Currently supports over 200 robots.
Integrated:
- Supports Velocity and Freemarker for writing decorators.