org.springframework.web.servlet
Class DispatcherServlet

java.lang.Object
  HttpServlet
      org.springframework.web.servlet.HttpServletBean
          org.springframework.web.servlet.FrameworkServlet
              org.springframework.web.servlet.DispatcherServlet

public class DispatcherServlet
extends FrameworkServlet

Central dispatcher for HTTP request handlers/controllers, e.g. for web UI controllers or HTTP-based remote service exporters. Dispatches to registered handlers for processing a web request, providing convenient mapping and exception handling facilities.

This servlet is very flexible: It can be used with just about any workflow, with the installation of the appropriate adapter classes. It offers the following functionality that distinguishes it from other request-driven web MVC frameworks:

• It is based around a JavaBeans configuration mechanism.
• It can use any HandlerMapping implementation - pre-built or provided as part of an application - to control the routing of requests to handler objects. Default is BeanNameUrlHandlerMapping and DefaultAnnotationHandlerMapping. HandlerMapping objects can be defined as beans in the servlet's application context, implementing the HandlerMapping interface, overriding the default HandlerMapping if present. HandlerMappings can be given any bean name (they are tested by type).
• It can use any HandlerAdapter; this allows for using any handler interface. Default adapters are HttpRequestHandlerAdapter, SimpleControllerHandlerAdapter, for Spring's HttpRequestHandler and Controller interfaces, respectively. A default AnnotationMethodHandlerAdapter will be registered as well. HandlerAdapter objects can be added as beans in the application context, overriding the default HandlerAdapters. Like HandlerMappings, HandlerAdapters can be given any bean name (they are tested by type).
• The dispatcher's exception resolution strategy can be specified via a HandlerExceptionResolver, for example mapping certain exceptions to error pages. Default are AnnotationMethodHandlerExceptionResolver, ResponseStatusExceptionResolver, and DefaultHandlerExceptionResolver. These HandlerExceptionResolvers can be overridden through the application context. HandlerExceptionResolver can be given any bean name (they are tested by type).
• Its view resolution strategy can be specified via a ViewResolver implementation, resolving symbolic view names into View objects. Default is InternalResourceViewResolver. ViewResolver objects can be added as beans in the application context, overriding the default ViewResolver. ViewResolvers can be given any bean name (they are tested by type).
• If a View or view name is not supplied by the user, then the configured RequestToViewNameTranslator will translate the current request into a view name. The corresponding bean name is "viewNameTranslator"; the default is DefaultRequestToViewNameTranslator.
• The dispatcher's strategy for resolving multipart requests is determined by a MultipartResolver implementation. Implementations for Jakarta Commons FileUpload and Jason Hunter's COS are included; the typical choise is CommonsMultipartResolver. The MultipartResolver bean name is "multipartResolver"; default is none.
• Its locale resolution strategy is determined by a LocaleResolver. Out-of-the-box implementations work via HTTP accept header, cookie, or session. The LocaleResolver bean name is "localeResolver"; default is AcceptHeaderLocaleResolver.
• Its theme resolution strategy is determined by a ThemeResolver. Implementations for a fixed theme and for cookie and session storage are included. The ThemeResolver bean name is "themeResolver"; default is FixedThemeResolver.

NOTE: The @RequestMapping annotation will only be processed if a corresponding HandlerMapping (for type level annotations) and/or HandlerAdapter (for method level annotations) is present in the dispatcher. This is the case by default. However, if you are defining custom HandlerMappings or HandlerAdapters, then you need to make sure that a corresponding custom DefaultAnnotationHandlerMapping and/or AnnotationMethodHandlerAdapter is defined as well - provided that you intend to use @RequestMapping.

A web application can define any number of DispatcherServlets. Each servlet will operate in its own namespace, loading its own application context with mappings, handlers, etc. Only the root application context as loaded by ContextLoaderListener, if any, will be shared.

Author:

Rod Johnson, Juergen Hoeller, Rob Harrop

See Also:

HttpRequestHandler, Controller, ContextLoaderListener

Field Summary

private boolean	cleanupAfterInclude Perform cleanup of request attributes after include request?
private static java.lang.String	DEFAULT_STRATEGIES_PATH Name of the class path resource (relative to the DispatcherServlet class) that defines DispatcherServlet's default strategy names.
private static java.util.Properties	defaultStrategies
private boolean	detectAllHandlerAdapters Detect all HandlerAdapters or just expect "handlerAdapter" bean?
private boolean	detectAllHandlerExceptionResolvers Detect all HandlerExceptionResolvers or just expect "handlerExceptionResolver" bean?
private boolean	detectAllHandlerMappings Detect all HandlerMappings or just expect "handlerMapping" bean?
private boolean	detectAllViewResolvers Detect all ViewResolvers or just expect "viewResolver" bean?
static java.lang.String	HANDLER_ADAPTER_BEAN_NAME Well-known name for the HandlerAdapter object in the bean factory for this namespace.
static java.lang.String	HANDLER_EXCEPTION_RESOLVER_BEAN_NAME Well-known name for the HandlerExceptionResolver object in the bean factory for this namespace.
static java.lang.String	HANDLER_MAPPING_BEAN_NAME Well-known name for the HandlerMapping object in the bean factory for this namespace.
private java.util.List<HandlerAdapter>	handlerAdapters List of HandlerAdapters used by this servlet
private java.util.List<HandlerExceptionResolver>	handlerExceptionResolvers List of HandlerExceptionResolvers used by this servlet
private java.util.List<HandlerMapping>	handlerMappings List of HandlerMappings used by this servlet
static java.lang.String	LOCALE_RESOLVER_ATTRIBUTE Request attribute to hold the current LocaleResolver, retrievable by views.
static java.lang.String	LOCALE_RESOLVER_BEAN_NAME Well-known name for the LocaleResolver object in the bean factory for this namespace.
private LocaleResolver	localeResolver LocaleResolver used by this servlet
static java.lang.String	MULTIPART_RESOLVER_BEAN_NAME Well-known name for the MultipartResolver object in the bean factory for this namespace.
private MultipartResolver	multipartResolver MultipartResolver used by this servlet
static java.lang.String	PAGE_NOT_FOUND_LOG_CATEGORY Log category to use when no mapped handler is found for a request.
protected static Log	pageNotFoundLogger Additional logger to use when no mapped handler is found for a request.
static java.lang.String	REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME Well-known name for the RequestToViewNameTranslator object in the bean factory for this namespace.
static java.lang.String	THEME_RESOLVER_ATTRIBUTE Request attribute to hold the current ThemeResolver, retrievable by views.
static java.lang.String	THEME_RESOLVER_BEAN_NAME Well-known name for the ThemeResolver object in the bean factory for this namespace.
static java.lang.String	THEME_SOURCE_ATTRIBUTE Request attribute to hold the current ThemeSource, retrievable by views.
private ThemeResolver	themeResolver ThemeResolver used by this servlet
private static UrlPathHelper	urlPathHelper
static java.lang.String	VIEW_RESOLVER_BEAN_NAME Well-known name for the ViewResolver object in the bean factory for this namespace.
private RequestToViewNameTranslator	viewNameTranslator RequestToViewNameTranslator used by this servlet
private java.util.List<ViewResolver>	viewResolvers List of ViewResolvers used by this servlet
static java.lang.String	WEB_APPLICATION_CONTEXT_ATTRIBUTE Request attribute to hold the current web application context.

Fields inherited from class org.springframework.web.servlet.FrameworkServlet

DEFAULT_CONTEXT_CLASS, DEFAULT_NAMESPACE_SUFFIX, SERVLET_CONTEXT_PREFIX

Fields inherited from class org.springframework.web.servlet.HttpServletBean

logger

Constructor Summary

DispatcherServlet()

Method Summary

protected LocaleContext	buildLocaleContext(HttpServletRequest request) Build a LocaleContext for the given request, exposing the request's primary locale as current locale.
protected HttpServletRequest	checkMultipart(HttpServletRequest request) Convert the request into a multipart request, and make multipart resolver available.
protected void	cleanupMultipart(HttpServletRequest request) Clean up any resources used by the given multipart request (if any).
protected java.lang.Object	createDefaultStrategy(ApplicationContext context, java.lang.Class<?> clazz) Create a default strategy.
protected void	doDispatch(HttpServletRequest request, HttpServletResponse response) Process the actual dispatching to the handler.
protected void	doService(HttpServletRequest request, HttpServletResponse response) Exposes the DispatcherServlet-specific request attributes and delegates to doDispatch(HttpServletRequest, HttpServletResponse) for the actual dispatching.
protected <T> java.util.List<T>	getDefaultStrategies(ApplicationContext context, java.lang.Class<T> strategyInterface) Create a List of default strategy objects for the given strategy interface.
protected <T> T	getDefaultStrategy(ApplicationContext context, java.lang.Class<T> strategyInterface) Return the default strategy object for the given strategy interface.
protected java.lang.String	getDefaultViewName(HttpServletRequest request) Translate the supplied request into a default view name.
protected HandlerExecutionChain	getHandler(HttpServletRequest request) Return the HandlerExecutionChain for this request.
protected HandlerExecutionChain	getHandler(HttpServletRequest request, boolean cache) Deprecated. as of Spring 3.0.4, in favor of #getHandler(javax.servlet.http.HttpServletRequest), with this method's cache attribute now effectively getting ignored
protected HandlerAdapter	getHandlerAdapter(java.lang.Object handler) Return the HandlerAdapter for this handler object.
MultipartResolver	getMultipartResolver() Obtain this servlet's MultipartResolver, if any.
ThemeSource	getThemeSource() Return this servlet's ThemeSource, if any; else return null.
private void	initHandlerAdapters(ApplicationContext context) Initialize the HandlerAdapters used by this class.
private void	initHandlerExceptionResolvers(ApplicationContext context) Initialize the HandlerExceptionResolver used by this class.
private void	initHandlerMappings(ApplicationContext context) Initialize the HandlerMappings used by this class.
private void	initLocaleResolver(ApplicationContext context) Initialize the LocaleResolver used by this class.
private void	initMultipartResolver(ApplicationContext context) Initialize the MultipartResolver used by this class.
private void	initRequestToViewNameTranslator(ApplicationContext context) Initialize the RequestToViewNameTranslator used by this servlet instance.
protected void	initStrategies(ApplicationContext context) Initialize the strategy objects that this servlet uses.
private void	initThemeResolver(ApplicationContext context) Initialize the ThemeResolver used by this class.
private void	initViewResolvers(ApplicationContext context) Initialize the ViewResolvers used by this class.
protected void	noHandlerFound(HttpServletRequest request, HttpServletResponse response) No handler found -> set appropriate HTTP response status.
protected void	onRefresh(ApplicationContext context) This implementation calls initStrategies(org.springframework.context.ApplicationContext).
protected ModelAndView	processHandlerException(HttpServletRequest request, HttpServletResponse response, java.lang.Object handler, java.lang.Exception ex) Determine an error ModelAndView via the registered HandlerExceptionResolvers.
protected void	render(ModelAndView mv, HttpServletRequest request, HttpServletResponse response) Render the given ModelAndView.
protected View	resolveViewName(java.lang.String viewName, java.util.Map<java.lang.String,java.lang.Object> model, java.util.Locale locale, HttpServletRequest request) Resolve the given view name into a View object (to be rendered).
private void	restoreAttributesAfterInclude(HttpServletRequest request, java.util.Map attributesSnapshot) Restore the request attributes after an include.
void	setCleanupAfterInclude(boolean cleanupAfterInclude) Set whether to perform cleanup of request attributes after an include request, that is, whether to reset the original state of all request attributes after the DispatcherServlet has processed within an include request.
void	setDetectAllHandlerAdapters(boolean detectAllHandlerAdapters) Set whether to detect all HandlerAdapter beans in this servlet's context.
void	setDetectAllHandlerExceptionResolvers(boolean detectAllHandlerExceptionResolvers) Set whether to detect all HandlerExceptionResolver beans in this servlet's context.
void	setDetectAllHandlerMappings(boolean detectAllHandlerMappings) Set whether to detect all HandlerMapping beans in this servlet's context.
void	setDetectAllViewResolvers(boolean detectAllViewResolvers) Set whether to detect all ViewResolver beans in this servlet's context.
private void	triggerAfterCompletion(HandlerExecutionChain mappedHandler, int interceptorIndex, HttpServletRequest request, HttpServletResponse response, java.lang.Exception ex) Trigger afterCompletion callbacks on the mapped HandlerInterceptors.

Methods inherited from class org.springframework.web.servlet.FrameworkServlet

createWebApplicationContext, createWebApplicationContext, destroy, doDelete, doGet, doOptions, doPost, doPut, doTrace, findWebApplicationContext, getContextAttribute, getContextClass, getContextConfigLocation, getContextId, getNamespace, getServletContextAttributeName, getUsernameForRequest, getWebApplicationContext, initFrameworkServlet, initServletBean, initWebApplicationContext, onApplicationEvent, postProcessWebApplicationContext, processRequest, refresh, setContextAttribute, setContextClass, setContextConfigLocation, setContextId, setDispatchOptionsRequest, setDispatchTraceRequest, setNamespace, setPublishContext, setPublishEvents, setThreadContextInheritable

Methods inherited from class org.springframework.web.servlet.HttpServletBean

addRequiredProperty, getServletContext, getServletName, init, initBeanWrapper

Methods inherited from class java.lang.Object

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

Field Detail

MULTIPART_RESOLVER_BEAN_NAME

public static final java.lang.String MULTIPART_RESOLVER_BEAN_NAME

Well-known name for the MultipartResolver object in the bean factory for this namespace.

See Also:

Constant Field Values

LOCALE_RESOLVER_BEAN_NAME

public static final java.lang.String LOCALE_RESOLVER_BEAN_NAME

Well-known name for the LocaleResolver object in the bean factory for this namespace.

See Also:

Constant Field Values

THEME_RESOLVER_BEAN_NAME

public static final java.lang.String THEME_RESOLVER_BEAN_NAME

Well-known name for the ThemeResolver object in the bean factory for this namespace.

See Also:

Constant Field Values

HANDLER_MAPPING_BEAN_NAME

public static final java.lang.String HANDLER_MAPPING_BEAN_NAME

Well-known name for the HandlerMapping object in the bean factory for this namespace. Only used when "detectAllHandlerMappings" is turned off.

See Also:

setDetectAllHandlerMappings(boolean), Constant Field Values

HANDLER_ADAPTER_BEAN_NAME

public static final java.lang.String HANDLER_ADAPTER_BEAN_NAME

Well-known name for the HandlerAdapter object in the bean factory for this namespace. Only used when "detectAllHandlerAdapters" is turned off.

See Also:

setDetectAllHandlerAdapters(boolean), Constant Field Values

HANDLER_EXCEPTION_RESOLVER_BEAN_NAME

public static final java.lang.String HANDLER_EXCEPTION_RESOLVER_BEAN_NAME

Well-known name for the HandlerExceptionResolver object in the bean factory for this namespace. Only used when "detectAllHandlerExceptionResolvers" is turned off.

See Also:

setDetectAllHandlerExceptionResolvers(boolean), Constant Field Values

REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME

public static final java.lang.String REQUEST_TO_VIEW_NAME_TRANSLATOR_BEAN_NAME

Well-known name for the RequestToViewNameTranslator object in the bean factory for this namespace.

See Also:

Constant Field Values

VIEW_RESOLVER_BEAN_NAME

public static final java.lang.String VIEW_RESOLVER_BEAN_NAME

Well-known name for the ViewResolver object in the bean factory for this namespace. Only used when "detectAllViewResolvers" is turned off.

See Also:

setDetectAllViewResolvers(boolean), Constant Field Values

WEB_APPLICATION_CONTEXT_ATTRIBUTE

public static final java.lang.String WEB_APPLICATION_CONTEXT_ATTRIBUTE

Request attribute to hold the current web application context. Otherwise only the global web app context is obtainable by tags etc.

See Also:

RequestContextUtils.getWebApplicationContext(ServletRequest)

LOCALE_RESOLVER_ATTRIBUTE

public static final java.lang.String LOCALE_RESOLVER_ATTRIBUTE

Request attribute to hold the current LocaleResolver, retrievable by views.

See Also:

RequestContextUtils.getLocaleResolver(HttpServletRequest)

THEME_RESOLVER_ATTRIBUTE

public static final java.lang.String THEME_RESOLVER_ATTRIBUTE

Request attribute to hold the current ThemeResolver, retrievable by views.

See Also:

RequestContextUtils.getThemeResolver(HttpServletRequest)

THEME_SOURCE_ATTRIBUTE

public static final java.lang.String THEME_SOURCE_ATTRIBUTE

Request attribute to hold the current ThemeSource, retrievable by views.

See Also:

RequestContextUtils.getThemeSource(HttpServletRequest)

PAGE_NOT_FOUND_LOG_CATEGORY

public static final java.lang.String PAGE_NOT_FOUND_LOG_CATEGORY

Log category to use when no mapped handler is found for a request.

See Also:

Constant Field Values

DEFAULT_STRATEGIES_PATH

private static final java.lang.String DEFAULT_STRATEGIES_PATH

Name of the class path resource (relative to the DispatcherServlet class) that defines DispatcherServlet's default strategy names.

See Also:

Constant Field Values

pageNotFoundLogger

protected static final Log pageNotFoundLogger

Additional logger to use when no mapped handler is found for a request.

urlPathHelper

private static final UrlPathHelper urlPathHelper

defaultStrategies

private static final java.util.Properties defaultStrategies

detectAllHandlerMappings

private boolean detectAllHandlerMappings

Detect all HandlerMappings or just expect "handlerMapping" bean?

detectAllHandlerAdapters

private boolean detectAllHandlerAdapters

Detect all HandlerAdapters or just expect "handlerAdapter" bean?

detectAllHandlerExceptionResolvers

private boolean detectAllHandlerExceptionResolvers

Detect all HandlerExceptionResolvers or just expect "handlerExceptionResolver" bean?

detectAllViewResolvers

private boolean detectAllViewResolvers

Detect all ViewResolvers or just expect "viewResolver" bean?

cleanupAfterInclude

private boolean cleanupAfterInclude

Perform cleanup of request attributes after include request?

multipartResolver

private MultipartResolver multipartResolver

MultipartResolver used by this servlet

localeResolver

private LocaleResolver localeResolver

LocaleResolver used by this servlet

themeResolver

private ThemeResolver themeResolver

ThemeResolver used by this servlet

handlerMappings

private java.util.List<HandlerMapping> handlerMappings

List of HandlerMappings used by this servlet

handlerAdapters

private java.util.List<HandlerAdapter> handlerAdapters

List of HandlerAdapters used by this servlet

handlerExceptionResolvers

private java.util.List<HandlerExceptionResolver> handlerExceptionResolvers

List of HandlerExceptionResolvers used by this servlet

viewNameTranslator

private RequestToViewNameTranslator viewNameTranslator

RequestToViewNameTranslator used by this servlet

viewResolvers

private java.util.List<ViewResolver> viewResolvers

List of ViewResolvers used by this servlet

Constructor Detail

DispatcherServlet

public DispatcherServlet()

Method Detail

setDetectAllHandlerMappings

public void setDetectAllHandlerMappings(boolean detectAllHandlerMappings)

Set whether to detect all HandlerMapping beans in this servlet's context. Otherwise, just a single bean with name "handlerMapping" will be expected.

Default is "true". Turn this off if you want this servlet to use a single HandlerMapping, despite multiple HandlerMapping beans being defined in the context.

setDetectAllHandlerAdapters

public void setDetectAllHandlerAdapters(boolean detectAllHandlerAdapters)

Set whether to detect all HandlerAdapter beans in this servlet's context. Otherwise, just a single bean with name "handlerAdapter" will be expected.

Default is "true". Turn this off if you want this servlet to use a single HandlerAdapter, despite multiple HandlerAdapter beans being defined in the context.

setDetectAllHandlerExceptionResolvers

public void setDetectAllHandlerExceptionResolvers(boolean detectAllHandlerExceptionResolvers)

Set whether to detect all HandlerExceptionResolver beans in this servlet's context. Otherwise, just a single bean with name "handlerExceptionResolver" will be expected.

Default is "true". Turn this off if you want this servlet to use a single HandlerExceptionResolver, despite multiple HandlerExceptionResolver beans being defined in the context.

setDetectAllViewResolvers

public void setDetectAllViewResolvers(boolean detectAllViewResolvers)

Set whether to detect all ViewResolver beans in this servlet's context. Otherwise, just a single bean with name "viewResolver" will be expected.

Default is "true". Turn this off if you want this servlet to use a single ViewResolver, despite multiple ViewResolver beans being defined in the context.

setCleanupAfterInclude

public void setCleanupAfterInclude(boolean cleanupAfterInclude)

Set whether to perform cleanup of request attributes after an include request, that is, whether to reset the original state of all request attributes after the DispatcherServlet has processed within an include request. Otherwise, just the DispatcherServlet's own request attributes will be reset, but not model attributes for JSPs or special attributes set by views (for example, JSTL's).

Default is "true", which is strongly recommended. Views should not rely on request attributes having been set by (dynamic) includes. This allows JSP views rendered by an included controller to use any model attributes, even with the same names as in the main JSP, without causing side effects. Only turn this off for special needs, for example to deliberately allow main JSPs to access attributes from JSP views rendered by an included controller.

onRefresh

protected void onRefresh(ApplicationContext context)

This implementation calls initStrategies(org.springframework.context.ApplicationContext).

Overrides:

onRefresh in class FrameworkServlet

Parameters:

context - the current WebApplicationContext

See Also:

FrameworkServlet.refresh()

initStrategies

protected void initStrategies(ApplicationContext context)

Initialize the strategy objects that this servlet uses.

May be overridden in subclasses in order to initialize further strategy objects.

initMultipartResolver

private void initMultipartResolver(ApplicationContext context)

Initialize the MultipartResolver used by this class.

If no bean is defined with the given name in the BeanFactory for this namespace, no multipart handling is provided.

initLocaleResolver

private void initLocaleResolver(ApplicationContext context)

Initialize the LocaleResolver used by this class.

If no bean is defined with the given name in the BeanFactory for this namespace, we default to AcceptHeaderLocaleResolver.

initThemeResolver

private void initThemeResolver(ApplicationContext context)

Initialize the ThemeResolver used by this class.

If no bean is defined with the given name in the BeanFactory for this namespace, we default to a FixedThemeResolver.

initHandlerMappings

private void initHandlerMappings(ApplicationContext context)

Initialize the HandlerMappings used by this class.

If no HandlerMapping beans are defined in the BeanFactory for this namespace, we default to BeanNameUrlHandlerMapping.

initHandlerAdapters

private void initHandlerAdapters(ApplicationContext context)

Initialize the HandlerAdapters used by this class.

If no HandlerAdapter beans are defined in the BeanFactory for this namespace, we default to SimpleControllerHandlerAdapter.

initHandlerExceptionResolvers

private void initHandlerExceptionResolvers(ApplicationContext context)

Initialize the HandlerExceptionResolver used by this class.

If no bean is defined with the given name in the BeanFactory for this namespace, we default to no exception resolver.

initRequestToViewNameTranslator

private void initRequestToViewNameTranslator(ApplicationContext context)

Initialize the RequestToViewNameTranslator used by this servlet instance.

If no implementation is configured then we default to DefaultRequestToViewNameTranslator.

initViewResolvers

private void initViewResolvers(ApplicationContext context)

Initialize the ViewResolvers used by this class.

If no ViewResolver beans are defined in the BeanFactory for this namespace, we default to InternalResourceViewResolver.

getThemeSource

public final ThemeSource getThemeSource()

Return this servlet's ThemeSource, if any; else return null.

Default is to return the WebApplicationContext as ThemeSource, provided that it implements the ThemeSource interface.

Returns:

the ThemeSource, if any

See Also:

FrameworkServlet.getWebApplicationContext()

getMultipartResolver

public final MultipartResolver getMultipartResolver()

Obtain this servlet's MultipartResolver, if any.

Returns:

the MultipartResolver used by this servlet, or null if none (indicating that no multipart support is available)

getDefaultStrategy

protected <T> T getDefaultStrategy(ApplicationContext context,
                                   java.lang.Class<T> strategyInterface)

Return the default strategy object for the given strategy interface.

The default implementation delegates to getDefaultStrategies(org.springframework.context.ApplicationContext, java.lang.Class), expecting a single object in the list.

Parameters:

context - the current WebApplicationContext

strategyInterface - the strategy interface

Returns:

the corresponding strategy object

See Also:

getDefaultStrategies(org.springframework.context.ApplicationContext, java.lang.Class)

getDefaultStrategies

protected <T> java.util.List<T> getDefaultStrategies(ApplicationContext context,
                                                     java.lang.Class<T> strategyInterface)

Create a List of default strategy objects for the given strategy interface.

The default implementation uses the "DispatcherServlet.properties" file (in the same package as the DispatcherServlet class) to determine the class names. It instantiates the strategy objects through the context's BeanFactory.

Parameters:

context - the current WebApplicationContext

strategyInterface - the strategy interface

Returns:

the List of corresponding strategy objects

createDefaultStrategy

protected java.lang.Object createDefaultStrategy(ApplicationContext context,
                                                 java.lang.Class<?> clazz)

Create a default strategy.

The default implementation uses AutowireCapableBeanFactory.createBean(java.lang.Class).

Parameters:

context - the current WebApplicationContext

clazz - the strategy implementation class to instantiate

Returns:

the fully configured strategy instance

See Also:

ApplicationContext.getAutowireCapableBeanFactory(), AutowireCapableBeanFactory.createBean(java.lang.Class)

doService

protected void doService(HttpServletRequest request,
                         HttpServletResponse response)
                  throws java.lang.Exception

Exposes the DispatcherServlet-specific request attributes and delegates to doDispatch(HttpServletRequest, HttpServletResponse) for the actual dispatching.

Specified by:

doService in class FrameworkServlet

Parameters:

request - current HTTP request

response - current HTTP response

Throws:

java.lang.Exception - in case of any kind of processing failure

See Also:

javax.servlet.http.HttpServlet#doGet, javax.servlet.http.HttpServlet#doPost

doDispatch

protected void doDispatch(HttpServletRequest request,
                          HttpServletResponse response)
                   throws java.lang.Exception

Process the actual dispatching to the handler.

The handler will be obtained by applying the servlet's HandlerMappings in order. The HandlerAdapter will be obtained by querying the servlet's installed HandlerAdapters to find the first that supports the handler class.

All HTTP methods are handled by this method. It's up to HandlerAdapters or handlers themselves to decide which methods are acceptable.

Parameters:

request - current HTTP request

response - current HTTP response

Throws:

java.lang.Exception - in case of any kind of processing failure

buildLocaleContext

protected LocaleContext buildLocaleContext(HttpServletRequest request)

Build a LocaleContext for the given request, exposing the request's primary locale as current locale.

The default implementation uses the dispatcher's LocaleResolver to obtain the current locale, which might change during a request.

Overrides:

buildLocaleContext in class FrameworkServlet

Parameters:

request - current HTTP request

Returns:

the corresponding LocaleContext

checkMultipart

protected HttpServletRequest checkMultipart(HttpServletRequest request)
                                     throws MultipartException

Convert the request into a multipart request, and make multipart resolver available.

If no multipart resolver is set, simply use the existing request.

Parameters:

request - current HTTP request

Returns:

the processed request (multipart wrapper if necessary)

Throws:

MultipartException

See Also:

MultipartResolver.resolveMultipart(HttpServletRequest)

cleanupMultipart

protected void cleanupMultipart(HttpServletRequest request)

Clean up any resources used by the given multipart request (if any).

Parameters:

request - current HTTP request

See Also:

MultipartResolver.cleanupMultipart(org.springframework.web.multipart.MultipartHttpServletRequest)

getHandler

@Deprecated
protected HandlerExecutionChain getHandler(HttpServletRequest request,
                                                      boolean cache)
                                    throws java.lang.Exception

Deprecated. as of Spring 3.0.4, in favor of #getHandler(javax.servlet.http.HttpServletRequest), with this method's cache attribute now effectively getting ignored

Return the HandlerExecutionChain for this request. Try all handler mappings in order.

Parameters:

request - current HTTP request

cache - whether to cache the HandlerExecutionChain in a request attribute

Returns:

the HandlerExecutionChain, or null if no handler could be found

Throws:

java.lang.Exception

getHandler

protected HandlerExecutionChain getHandler(HttpServletRequest request)
                                    throws java.lang.Exception

Return the HandlerExecutionChain for this request.

Tries all handler mappings in order.

Parameters:

request - current HTTP request

Returns:

the HandlerExecutionChain, or null if no handler could be found

Throws:

java.lang.Exception

noHandlerFound

protected void noHandlerFound(HttpServletRequest request,
                              HttpServletResponse response)
                       throws java.lang.Exception

No handler found -> set appropriate HTTP response status.

Parameters:

request - current HTTP request

response - current HTTP response

Throws:

java.lang.Exception - if preparing the response failed

getHandlerAdapter

protected HandlerAdapter getHandlerAdapter(java.lang.Object handler)
                                    throws ServletException

Return the HandlerAdapter for this handler object.

Parameters:

handler - the handler object to find an adapter for

Throws:

ServletException - if no HandlerAdapter can be found for the handler. This is a fatal error.

processHandlerException

protected ModelAndView processHandlerException(HttpServletRequest request,
                                               HttpServletResponse response,
                                               java.lang.Object handler,
                                               java.lang.Exception ex)
                                        throws java.lang.Exception

Determine an error ModelAndView via the registered HandlerExceptionResolvers.

Parameters:

request - current HTTP request

response - current HTTP response

handler - the executed handler, or null if none chosen at the time of the exception (for example, if multipart resolution failed)

ex - the exception that got thrown during handler execution

Returns:

a corresponding ModelAndView to forward to

Throws:

java.lang.Exception - if no error ModelAndView found

render

protected void render(ModelAndView mv,
                      HttpServletRequest request,
                      HttpServletResponse response)
               throws java.lang.Exception

Render the given ModelAndView.

This is the last stage in handling a request. It may involve resolving the view by name.

Parameters:

mv - the ModelAndView to render

request - current HTTP servlet request

response - current HTTP servlet response

Throws:

ServletException - if view is missing or cannot be resolved

java.lang.Exception - if there's a problem rendering the view

getDefaultViewName

protected java.lang.String getDefaultViewName(HttpServletRequest request)
                                       throws java.lang.Exception

Translate the supplied request into a default view name.

Parameters:

request - current HTTP servlet request

Returns:

the view name (or null if no default found)

Throws:

java.lang.Exception - if view name translation failed

resolveViewName

protected View resolveViewName(java.lang.String viewName,
                               java.util.Map<java.lang.String,java.lang.Object> model,
                               java.util.Locale locale,
                               HttpServletRequest request)
                        throws java.lang.Exception

Resolve the given view name into a View object (to be rendered).

The default implementations asks all ViewResolvers of this dispatcher. Can be overridden for custom resolution strategies, potentially based on specific model attributes or request parameters.

Parameters:

viewName - the name of the view to resolve

model - the model to be passed to the view

locale - the current locale

request - current HTTP servlet request

Returns:

the View object, or null if none found

Throws:

java.lang.Exception - if the view cannot be resolved (typically in case of problems creating an actual View object)

See Also:

ViewResolver.resolveViewName(java.lang.String, java.util.Locale)

triggerAfterCompletion

private void triggerAfterCompletion(HandlerExecutionChain mappedHandler,
                                    int interceptorIndex,
                                    HttpServletRequest request,
                                    HttpServletResponse response,
                                    java.lang.Exception ex)
                             throws java.lang.Exception

Trigger afterCompletion callbacks on the mapped HandlerInterceptors. Will just invoke afterCompletion for all interceptors whose preHandle invocation has successfully completed and returned true.

Parameters:

mappedHandler - the mapped HandlerExecutionChain

interceptorIndex - index of last interceptor that successfully completed

ex - Exception thrown on handler execution, or null if none

Throws:

java.lang.Exception

See Also:

HandlerInterceptor.afterCompletion(HttpServletRequest, HttpServletResponse, java.lang.Object, java.lang.Exception)

restoreAttributesAfterInclude

private void restoreAttributesAfterInclude(HttpServletRequest request,
                                           java.util.Map attributesSnapshot)

Restore the request attributes after an include.

Parameters:

request - current HTTP request

attributesSnapshot - the snapshot of the request attributes before the include