Writing a Jetty Handler

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HandlerCollection - A collection of handlers, where each handler is called regardless of the state of the request. This is typically used to pass a request to a ContextHandlerCollection and then the a RequestLogHandler
HandlerList - A list of handlers which are called in turn until the request state is set as handled.
ContextHandlerCollection - collection of Handlers of which on is selected by best match for the context path.

Other stuff

Handlers are usually arranged in a list and a request presented to each handler in turn until (or at most) one indicates that the request has been handled. In this situation, this will allow handlers to:

Ignore requests that are not applicable
Handle requests by populating the response and/or generating content
Modify the request but allow it to pass onto the next handler(s). Headers and attributes may be modified or an InputStream filter added
Modify the response but allow the request to pass onto the next handler(s). Headers may be modified or OutputStream filters added

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Examples

See org.mortbay.jetty.

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Panel

Abstract Handler - Abstract handler.
Context Handler - This handler wraps a call to handle by setting the context and servlet path, plus setting the context classloader.
Error Handler - Handler for error pages. It is registered at the org.mortbay.jetty.handler.ErrorHandler context attributed and called by the HttpResponse.sendError method to write an error page.
Handler Collection - Handler collection.
Default Handler - Handler for resources that were not found. Implements OPTIONS and TRACE methods for the server.
Request Log Handler - This handler can be used to wrap an individual context for context logging.
Handler wrapper - Handler collection.

There are some examples of implementing custom handlers in the Embedded Examples.

Writing a Jetty Handler

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Other stuff

Examples