org.springframework.web.servlet.resource

Class ResourceUrlProvider

java.lang.Object

org.springframework.web.servlet.resource.ResourceUrlProvider

All Implemented Interfaces:

java.util.EventListener, ApplicationListener<ContextRefreshedEvent>

public class ResourceUrlProvider
extends java.lang.Object
implements ApplicationListener<ContextRefreshedEvent>

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

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	autodetect
private java.util.Map<java.lang.String,ResourceHttpRequestHandler>	handlerMap
protected Log	logger
private UrlPathHelper	pathHelper
private PathMatcher	pathMatcher

Constructor Summary

Constructors

Constructor and Description
ResourceUrlProvider()

Method Summary

Modifier and Type	Method and Description
protected void	detectResourceHandlers(ApplicationContext appContext)
java.lang.String	getForLookupPath(java.lang.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.
java.lang.String	getForRequestUrl(HttpServletRequest request, java.lang.String requestUrl) A variation on getForLookupPath(String) that accepts a full request URL path (i.e.
java.util.Map<java.lang.String,ResourceHttpRequestHandler>	getHandlerMap() Return the resource mappings, either manually configured or auto-detected when the Spring ApplicationContext is refreshed.
private int	getLookupPathIndex(HttpServletRequest request)
UrlPathHelper	getPathHelper() Return the configured UrlPathHelper.
PathMatcher	getPathMatcher() Return the configured PathMatcher.
boolean	isAutodetect() Return false if resource mappings were manually configured, true otherwise.
void	onApplicationEvent(ContextRefreshedEvent event) Handle an application event.
void	setHandlerMap(java.util.Map<java.lang.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 pathHelper) 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

pathHelper

private UrlPathHelper pathHelper

pathMatcher

private PathMatcher pathMatcher

handlerMap

private final java.util.Map<java.lang.String,ResourceHttpRequestHandler> handlerMap

autodetect

private boolean autodetect

Constructor Detail

ResourceUrlProvider

public ResourceUrlProvider()

Method Detail

setUrlPathHelper

public void setUrlPathHelper(UrlPathHelper pathHelper)

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.

getPathHelper

public UrlPathHelper getPathHelper()

Return the configured UrlPathHelper.

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(java.util.Map<java.lang.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 java.util.Map<java.lang.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

public final java.lang.String getForRequestUrl(HttpServletRequest request,
                                               java.lang.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

getLookupPathIndex

private int getLookupPathIndex(HttpServletRequest request)

getForLookupPath

public final java.lang.String getForLookupPath(java.lang.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