Package org.springframework.web.servlet.handler

Class SimpleServletHandlerAdapter

java.lang.Object

org.springframework.web.servlet.handler.SimpleServletHandlerAdapter

All Implemented Interfaces:

HandlerAdapter

public class SimpleServletHandlerAdapter
extends Object
implements HandlerAdapter

Adapter to use the Servlet interface with the generic DispatcherServlet. Calls the Servlet's service method to handle a request.

Last-modified checking is not explicitly supported: This is typically handled by the Servlet implementation itself (usually deriving from the HttpServlet base class).

This adapter is not activated by default; it needs to be defined as a bean in the DispatcherServlet context. It will automatically apply to mapped handler beans that implement the Servlet interface then.

Note that Servlet instances defined as bean will not receive initialization and destruction callbacks, unless a special post-processor such as SimpleServletPostProcessor is defined in the DispatcherServlet context.

Alternatively, consider wrapping a Servlet with Spring's ServletWrappingController. This is particularly appropriate for existing Servlet classes, allowing to specify Servlet initialization parameters etc.

Since:

1.1.5

Author:

Juergen Hoeller

See Also:

• Servlet
• HttpServlet
• SimpleServletPostProcessor
• ServletWrappingController

Constructor Summary

Constructors

Constructor	Description
SimpleServletHandlerAdapter()

Method Summary

Modifier and Type	Method	Description
long	getLastModified(HttpServletRequest request, Object handler)	Same contract as for HttpServlet's getLastModified method.
ModelAndView	handle(HttpServletRequest request, HttpServletResponse response, Object handler)	Use the given handler to handle this request.
boolean	supports(Object handler)	Given a handler instance, return whether this HandlerAdapter can support it.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

SimpleServletHandlerAdapter

public SimpleServletHandlerAdapter()

Method Details

supports

public boolean supports(Object handler)

Description copied from interface: HandlerAdapter

Given a handler instance, return whether this HandlerAdapter can support it. Typical HandlerAdapters will base the decision on the handler type. HandlerAdapters will usually only support one handler type each.

A typical implementation:

return (handler instanceof MyHandler);

Specified by:

supports in interface HandlerAdapter

Parameters:

handler - the handler object to check

Returns:

whether this object can use the given handler

handle

@Nullable
public ModelAndView handle(HttpServletRequest request,
 HttpServletResponse response,
 Object handler)
                    throws Exception

Description copied from interface: HandlerAdapter

Use the given handler to handle this request. The workflow that is required may vary widely.

Specified by:

handle in interface HandlerAdapter

Parameters:

request - current HTTP request

response - current HTTP response

handler - the handler to use. This object must have previously been passed to the supports method of this interface, which must have returned true.

Returns:

a ModelAndView object with the name of the view and the required model data, or null if the request has been handled directly

Throws:

Exception - in case of errors

getLastModified

public long getLastModified(HttpServletRequest request,
 Object handler)

Description copied from interface: HandlerAdapter

Same contract as for HttpServlet's getLastModified method. Can simply return -1 if there's no support in the handler class.

Specified by:

getLastModified in interface HandlerAdapter

Parameters:

request - current HTTP request

handler - the handler to use

Returns:

the lastModified value for the given handler