org.springframework.web.servlet.resource

Class ResourceUrlProvider

java.lang.Object

org.springframework.web.servlet.resource.ResourceUrlProvider

All Implemented Interfaces:

EventListener, Aware, ApplicationContextAware, ApplicationListener<ContextRefreshedEvent>

public class ResourceUrlProvider
extends Object
implements ApplicationListener<ContextRefreshedEvent>, ApplicationContextAware

A central component to use to obtain the public URL path that clients should use to access a static resource.

This class is aware of Spring MVC handler mappings used to serve static resources and uses the ResourceResolver chains of the configured ResourceHttpRequestHandlers to make its decisions.

Since:

4.1

Author:

Rossen Stoyanchev, Brian Clozel

Field Summary

Fields

Modifier and Type	Field and Description
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
ResourceUrlProvider()

Method Summary

Modifier and Type	Method and Description
protected void	detectResourceHandlers(ApplicationContext appContext)
String	getForLookupPath(String lookupPath) Compare the given path against configured resource handler mappings and if a match is found use the ResourceResolver chain of the matched ResourceHttpRequestHandler to resolve the URL path to expose for public use.
String	getForRequestUrl(HttpServletRequest request, String requestUrl) A variation on getForLookupPath(String) that accepts a full request URL path (i.e.
Map<String,ResourceHttpRequestHandler>	getHandlerMap() Return the resource mappings, either manually configured or auto-detected when the Spring ApplicationContext is refreshed.
PathMatcher	getPathMatcher() Return the configured PathMatcher.
UrlPathHelper	getUrlPathHelper() Return the configured UrlPathHelper.
boolean	isAutodetect() Return false if resource mappings were manually configured, true otherwise.
void	onApplicationEvent(ContextRefreshedEvent event) Handle an application event.
void	setApplicationContext(ApplicationContext applicationContext) Set the ApplicationContext that this object runs in.
void	setHandlerMap(Map<String,ResourceHttpRequestHandler> handlerMap) Manually configure the resource mappings.
void	setPathMatcher(PathMatcher pathMatcher) Configure a PathMatcher to use when comparing target lookup path against resource mappings.
void	setUrlPathHelper(UrlPathHelper urlPathHelper) Configure a UrlPathHelper to use in getForRequestUrl(javax.servlet.http.HttpServletRequest, String) in order to derive the lookup path for a target request URL path.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

Constructor Detail

ResourceUrlProvider

public ResourceUrlProvider()

Method Detail

setApplicationContext

public void setApplicationContext(ApplicationContext applicationContext)
                           throws BeansException

Description copied from interface: ApplicationContextAware

Set the ApplicationContext that this object runs in. Normally this call will be used to initialize the object.

Invoked after population of normal bean properties but before an init callback such as InitializingBean.afterPropertiesSet() or a custom init-method. Invoked after ResourceLoaderAware.setResourceLoader(org.springframework.core.io.ResourceLoader), ApplicationEventPublisherAware.setApplicationEventPublisher(org.springframework.context.ApplicationEventPublisher) and MessageSourceAware, if applicable.

Specified by:

setApplicationContext in interface ApplicationContextAware

Parameters:

applicationContext - the ApplicationContext object to be used by this object

Throws:

ApplicationContextException - in case of context initialization errors

BeansException - if thrown by application context methods

See Also:

BeanInitializationException

setUrlPathHelper

public void setUrlPathHelper(UrlPathHelper urlPathHelper)

Configure a UrlPathHelper to use in getForRequestUrl(javax.servlet.http.HttpServletRequest, String) in order to derive the lookup path for a target request URL path.

getUrlPathHelper

public UrlPathHelper getUrlPathHelper()

Return the configured UrlPathHelper.

Since:

4.2.8

setPathMatcher

public void setPathMatcher(PathMatcher pathMatcher)

Configure a PathMatcher to use when comparing target lookup path against resource mappings.

getPathMatcher

public PathMatcher getPathMatcher()

Return the configured PathMatcher.

setHandlerMap

public void setHandlerMap(@Nullable
                          Map<String,ResourceHttpRequestHandler> handlerMap)

Manually configure the resource mappings.

Note: by default resource mappings are auto-detected from the Spring ApplicationContext. However if this property is used, the auto-detection is turned off.

getHandlerMap

public Map<String,ResourceHttpRequestHandler> getHandlerMap()

Return the resource mappings, either manually configured or auto-detected when the Spring ApplicationContext is refreshed.

isAutodetect

public boolean isAutodetect()

Return false if resource mappings were manually configured, true otherwise.

onApplicationEvent

public void onApplicationEvent(ContextRefreshedEvent event)

Description copied from interface: ApplicationListener

Handle an application event.

Specified by:

onApplicationEvent in interface ApplicationListener<ContextRefreshedEvent>

Parameters:

event - the event to respond to

detectResourceHandlers

protected void detectResourceHandlers(ApplicationContext appContext)

getForRequestUrl

@Nullable
public final String getForRequestUrl(HttpServletRequest request,
                                               String requestUrl)

A variation on getForLookupPath(String) that accepts a full request URL path (i.e. including context and servlet path) and returns the full request URL path to expose for public use.

Parameters:

request - the current request

requestUrl - the request URL path to resolve

Returns:

the resolved public URL path, or null if unresolved

getForLookupPath

@Nullable
public final String getForLookupPath(String lookupPath)

Compare the given path against configured resource handler mappings and if a match is found use the ResourceResolver chain of the matched ResourceHttpRequestHandler to resolve the URL path to expose for public use.

It is expected that the given path is what Spring MVC would use for request mapping purposes, i.e. excluding context and servlet path portions.

If several handler mappings match, the handler used will be the one configured with the most specific pattern.

Parameters:

lookupPath - the lookup path to check

Returns:

the resolved public URL path, or null if unresolved