org.springframework.web.servlet.mvc

Class WebContentInterceptor

java.lang.Object

org.springframework.context.support.ApplicationObjectSupport

org.springframework.web.context.support.WebApplicationObjectSupport

org.springframework.web.servlet.support.WebContentGenerator

org.springframework.web.servlet.mvc.WebContentInterceptor

All Implemented Interfaces:

Aware, ApplicationContextAware, ServletContextAware, HandlerInterceptor

public class WebContentInterceptor
extends WebContentGenerator
implements HandlerInterceptor

Handler interceptor that checks the request for supported methods and a required session and prepares the response by applying the configured cache settings.

Cache settings may be configured for specific URLs via path pattern with addCacheMapping(CacheControl, String...) and setCacheMappings(Properties), along with a fallback on default settings for all URLs via WebContentGenerator.setCacheControl(CacheControl).

Pattern matching can be done with PathMatcher or with parsed PathPatterns. The syntax is largely the same with the latter being more tailored for web usage and more efficient. The choice depends on the presence of a resolved String lookupPath or a parsed RequestPath which in turn depends on the HandlerMapping that matched the current request.

All the settings supported by this interceptor can also be set on AbstractController. This interceptor is mainly intended for applying checks and preparations to a set of controllers mapped by a HandlerMapping.

Since:

27.11.2003

Author:

Juergen Hoeller, Brian Clozel, Rossen Stoyanchev

See Also:

PathMatcher, AntPathMatcher

Field Summary

Fields inherited from class org.springframework.web.servlet.support.WebContentGenerator

HEADER_CACHE_CONTROL, METHOD_GET, METHOD_HEAD, METHOD_POST

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Constructor Summary

Constructors

Constructor and Description
WebContentInterceptor() Default constructor with PathPatternParser.defaultInstance.
WebContentInterceptor(PathPatternParser parser) Constructor with a PathPatternParser to parse patterns with.

Method Summary

Modifier and Type	Method and Description
void	addCacheMapping(CacheControl cacheControl, String... paths) Map specific URL paths to a specific CacheControl.
void	afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) This implementation is empty.
protected CacheControl	lookupCacheControl(PathContainer path) Find a CacheControl instance for the given parsed path.
protected CacheControl	lookupCacheControl(String lookupPath) Find a CacheControl instance for the given String lookupPath.
protected Integer	lookupCacheSeconds(PathContainer path) Find a cacheSeconds value for the given parsed path.
protected Integer	lookupCacheSeconds(String lookupPath) Find a cacheSeconds instance for the given String lookupPath.
void	postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) This implementation is empty.
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) Interception point before the execution of a handler.
void	setAlwaysUseFullPath(boolean alwaysUseFullPath) Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)
void	setCacheMappings(Properties cacheMappings) Map settings for cache seconds to specific URL paths via patterns.
void	setPathMatcher(PathMatcher pathMatcher) Configure the PathMatcher to use to match URL paths against registered URL patterns to select the cache settings for a request.
void	setUrlDecode(boolean urlDecode) Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)
void	setUrlPathHelper(UrlPathHelper urlPathHelper) Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)

Methods inherited from class org.springframework.web.servlet.support.WebContentGenerator

applyCacheControl, applyCacheSeconds, applyCacheSeconds, cacheForSeconds, cacheForSeconds, checkAndPrepare, checkAndPrepare, checkRequest, getAllowHeader, getCacheControl, getCacheSeconds, getSupportedMethods, getVaryByRequestHeaders, isAlwaysMustRevalidate, isRequireSession, isUseCacheControlHeader, isUseCacheControlNoStore, isUseExpiresHeader, prepareResponse, preventCaching, setAlwaysMustRevalidate, setCacheControl, setCacheSeconds, setRequireSession, setSupportedMethods, setUseCacheControlHeader, setUseCacheControlNoStore, setUseExpiresHeader, setVaryByRequestHeaders

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, initApplicationContext, obtainApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Constructor Detail

WebContentInterceptor

public WebContentInterceptor()

Default constructor with PathPatternParser.defaultInstance.

WebContentInterceptor

public WebContentInterceptor(PathPatternParser parser)

Constructor with a PathPatternParser to parse patterns with.

Since:

5.3

Method Detail

setAlwaysUseFullPath

@Deprecated
public void setAlwaysUseFullPath(boolean alwaysUseFullPath)

Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)

Shortcut to the same property on the configured UrlPathHelper.

setUrlDecode

@Deprecated
public void setUrlDecode(boolean urlDecode)

Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)

Shortcut to the same property on the configured UrlPathHelper.

setUrlPathHelper

@Deprecated
public void setUrlPathHelper(UrlPathHelper urlPathHelper)

Deprecated. as of 5.3, the path is resolved externally and obtained with ServletRequestPathUtils.getCachedPathValue(ServletRequest)

Set the UrlPathHelper to use for resolution of lookup paths.

setPathMatcher

public void setPathMatcher(PathMatcher pathMatcher)

Configure the PathMatcher to use to match URL paths against registered URL patterns to select the cache settings for a request.

This is an advanced property that should be used only when a customized AntPathMatcher or a custom PathMatcher is required.

By default this is AntPathMatcher.

Note: Setting PathMatcher enforces use of String pattern matching even when a parsed RequestPath is available.

See Also:

addCacheMapping(org.springframework.http.CacheControl, java.lang.String...), setCacheMappings(java.util.Properties), AntPathMatcher

setCacheMappings

public void setCacheMappings(Properties cacheMappings)

Map settings for cache seconds to specific URL paths via patterns.

Overrides the default cache seconds setting of this interceptor. Can specify "-1" to exclude a URL path from default caching.

For pattern syntax see AntPathMatcher and PathPattern as well as the class-level Javadoc for details for when each is used. The syntax is largely the same with PathPattern more tailored for web usage.

NOTE: Path patterns are not supposed to overlap. If a request matches several mappings, it is effectively undefined which one will apply (due to the lack of key ordering in java.util.Properties).

Parameters:

cacheMappings - a mapping between URL paths (as keys) and cache seconds (as values, need to be integer-parsable)

See Also:

WebContentGenerator.setCacheSeconds(int)

addCacheMapping

public void addCacheMapping(CacheControl cacheControl,
                            String... paths)

Map specific URL paths to a specific CacheControl.

Overrides the default cache seconds setting of this interceptor. Can specify an empty CacheControl instance to exclude a URL path from default caching.

For pattern syntax see AntPathMatcher and PathPattern as well as the class-level Javadoc for details for when each is used. The syntax is largely the same with PathPattern more tailored for web usage.

NOTE: Path patterns are not supposed to overlap. If a request matches several mappings, it is effectively undefined which one will apply (due to the lack of key ordering in the underlying java.util.HashMap).

Parameters:

cacheControl - the CacheControl to use

paths - the URL paths that will map to the given CacheControl

Since:

4.2

See Also:

WebContentGenerator.setCacheSeconds(int)

preHandle

public boolean preHandle(HttpServletRequest request,
                         HttpServletResponse response,
                         Object handler)
                  throws ServletException

Description copied from interface: HandlerInterceptor

Interception point before the execution of a handler. Called after HandlerMapping determined an appropriate handler object, but before HandlerAdapter invokes the handler.

DispatcherServlet processes a handler in an execution chain, consisting of any number of interceptors, with the handler itself at the end. With this method, each interceptor can decide to abort the execution chain, typically sending an HTTP error or writing a custom response.

Note: special considerations apply for asynchronous request processing. For more details see AsyncHandlerInterceptor.

The default implementation returns true.

Specified by:

preHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - chosen handler to execute, for type and/or instance evaluation

Returns:

true if the execution chain should proceed with the next interceptor or the handler itself. Else, DispatcherServlet assumes that this interceptor has already dealt with the response itself.

Throws:

ServletException

lookupCacheControl

@Nullable
protected CacheControl lookupCacheControl(PathContainer path)

Find a CacheControl instance for the given parsed path. This is used when the HandlerMapping uses parsed PathPatterns.

Parameters:

path - the path to match to

Returns:

the matched CacheControl, or null if no match

Since:

5.3

lookupCacheControl

@Nullable
protected CacheControl lookupCacheControl(String lookupPath)

Find a CacheControl instance for the given String lookupPath. This is used when the HandlerMapping relies on String pattern matching with PathMatcher.

Parameters:

lookupPath - the path to match to

Returns:

the matched CacheControl, or null if no match

lookupCacheSeconds

@Nullable
protected Integer lookupCacheSeconds(PathContainer path)

Find a cacheSeconds value for the given parsed path. This is used when the HandlerMapping uses parsed PathPatterns.

Parameters:

path - the path to match to

Returns:

the matched cacheSeconds, or null if there is no match

Since:

5.3

lookupCacheSeconds

@Nullable
protected Integer lookupCacheSeconds(String lookupPath)

Find a cacheSeconds instance for the given String lookupPath. This is used when the HandlerMapping relies on String pattern matching with PathMatcher.

Parameters:

lookupPath - the path to match to

Returns:

the matched cacheSeconds, or null if there is no match

postHandle

public void postHandle(HttpServletRequest request,
                       HttpServletResponse response,
                       Object handler,
                       @Nullable
                       ModelAndView modelAndView)
                throws Exception

This implementation is empty.

Specified by:

postHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - the handler (or HandlerMethod) that started asynchronous execution, for type and/or instance examination

modelAndView - the ModelAndView that the handler returned (can also be null)

Throws:

Exception - in case of errors

afterCompletion

public void afterCompletion(HttpServletRequest request,
                            HttpServletResponse response,
                            Object handler,
                            @Nullable
                            Exception ex)
                     throws Exception

This implementation is empty.

Specified by:

afterCompletion in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

handler - the handler (or HandlerMethod) that started asynchronous execution, for type and/or instance examination

ex - any exception thrown on handler execution, if any; this does not include exceptions that have been handled through an exception resolver

Throws:

Exception - in case of errors