Web開發框架 Apache Wicket
Wicket是一個Java 語言的Web開發框架，與Struts，WebWork，Tapestry 相類似。其特點在于對Html和代碼進行了有效的分離（有利于程序員和美工的合作），基于規則的配置(減少了XML 等配置文件的使用)，學習曲線較低（開發方式與C/S相似），更加易于調試（錯誤類型比較少，而且容易定位）。
功能特性：
POJO Component Model
Pages and Components in Wicket are real Java objects that support encapsulation, inheritance and events.
Ease of Development
Because Wicket is Java and HTML, you can leverage what you know about Java or your favorite HTML editor to write Wicket applications.
Separation of Concerns
Wicket does not mix markup with Java code and adds no special syntax to your markup files. The worlds of HTML and Java are parallel and associated only by Wicket ids, which are attributes in HTML and Component properties in Java. Since Wicket HTML is just HTML and Wicket Java is just Java, coders and designers can work independently to a large degree and without relying on any special tools.
Secure
Wicket is secure by default. URLs do not expose sensitive information and all component paths are session-relative. Explicit steps must be taken to share information between sessions. Furthermore URL encryption allows highly secure web sites.
Transparent, Scalable Clustering Support
All Wicket applications will work on a cluster automatically and without additional work. Once bottlenecks are understood, Wicket enables tuning of page state replication. The next version of Wicket will support client-side models for zero-state scalability.
Transparent Back Button Support
Wicket supports configurable page version management. When users submit a form or follow a link from a page they accessed with the back button in their browser, Wicket is able to revert the page object to the state it was in when the page was originally rendered. This means you can write web applications that support the back button with very little work.
Multi-tab and multi-window support
Wicket provides an easy way to write application that supports multi-window and multi-tab usage allowing developer to react properly when users open new browser window or tab
Reusable Components
Reusable components in Wicket are particularly easy to create. Not only can you extend existing components with the Java extends keyword, but you can also create Panel components which associate a group of components as a reusable unit.
Simple, Flexible, Localizable Form Validation
It is trivial to write and use validators in Wicket. It is also quite easy to customize and localize the display and content of validation error messages.
Typesafe Sessions
Wicket eliminates the need to manage HttpSession attributes by hand. Page and component objects are transparently stored in the session and your application can create a custom session subclass with typesafe properties as well. All objects stored in the session can automatically participate in clustering replication.
Factory Customizable
Wicket is very extensible. Most operations are customizable through factories or factory methods.
Detachable Models
Model objects in Wicket can be very lightweight in terms of memory and network use in a cluster. When a model is used, it can “attach”, populating itself with information from persistent storage. When the model is no longer in use, transient information can be reset, reducing the size of the object.
Border Components
Wicket Border components enable the decoration of pages in a reusable fashion. This is especially useful for inheritance of common navigational structures or layout.
Support for All Basic HTML Features
Wicket supports image tags, links, forms and everything else that you’re used to using in your web application development.
Programmatic Manipulation of Attributes
Wicket Components can programmatically change any HTML tag attribute.
Automatic Conversions
Once a Form validates, the model can be updated using Wicket converters. Most ordinary conversions are built-in and it is easy to write new converters.
Dynamic Images
Wicket makes image use, sharing and generation very easy. Dynamic images can be created by simply implementing a paint method.
Pageable ListView
ListViews in Wicket are extremely powerful. You can nest any kind of component in a ListView row, even other ListViews. PageableListView supports navigation links for large lists.
Tree Component
Out of the box tree component for navigating and selecting nodes.
Localization
HTML pages, images and resource strings can all be localized.