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WebContentInterceptor (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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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:

ApplicationContextAware, ServletContextAware, HandlerInterceptor

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public class WebContentInterceptor
extends WebContentGenerator
implements HandlerInterceptor

Interceptor that checks and prepares request and response. Checks for supported methods and a required session, and applies the specified number of cache seconds. See superclass bean properties for configuration options.

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

See Also:

AbstractController

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Field Summary

 

Fields inherited from class org.springframework.web.servlet.support.WebContentGenerator
METHOD_GET, METHOD_HEAD, METHOD_POST

 

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

 

Constructor Summary
WebContentInterceptor()

 

Method Summary
void	afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)           This implementation is empty.
protected  Integer	lookupCacheSeconds(String urlPath)           Look up a cache seconds value for the given URL path.
void	postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)           This implementation is empty.
boolean	preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)           Intercept the execution of a handler.
void	setAlwaysUseFullPath(boolean alwaysUseFullPath)           Set if URL lookup should always use full path within current servlet context.
void	setCacheMappings(Properties cacheMappings)           Map specific URL paths to specific cache seconds.
void	setPathMatcher(PathMatcher pathMatcher)           Set the PathMatcher implementation to use for matching URL paths against registered URL patterns, for determining cache mappings.
void	setUrlDecode(boolean urlDecode)           Set if context path and request URI should be URL-decoded.
void	setUrlPathHelper(UrlPathHelper urlPathHelper)           Set the UrlPathHelper to use for resolution of lookup paths.

 

Methods inherited from class org.springframework.web.servlet.support.WebContentGenerator
applyCacheSeconds, applyCacheSeconds, cacheForSeconds, cacheForSeconds, checkAndPrepare, checkAndPrepare, getCacheSeconds, getSupportedMethods, isRequireSession, isUseCacheControlHeader, isUseExpiresHeader, preventCaching, setCacheSeconds, setRequireSession, setSupportedMethods, setUseCacheControlHeader, setUseExpiresHeader

 

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport
getServletContext, getTempDir, getWebApplicationContext, isContextRequired, setServletContext

 

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport
getApplicationContext, getMessageSourceAccessor, initApplicationContext, 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()

Method Detail

setAlwaysUseFullPath

public void setAlwaysUseFullPath(boolean alwaysUseFullPath)

Set if URL lookup should always use full path within current servlet context. Else, the path within the current servlet mapping is used if applicable (i.e. in the case of a ".../*" servlet mapping in web.xml). Default is "false".

Only relevant for the "cacheMappings" setting.

See Also:

setCacheMappings(java.util.Properties), UrlPathHelper.setAlwaysUseFullPath(boolean)

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setUrlDecode

public void setUrlDecode(boolean urlDecode)

Set if context path and request URI should be URL-decoded. Both are returned undecoded by the Servlet API, in contrast to the servlet path.

Uses either the request encoding or the default encoding according to the Servlet spec (ISO-8859-1).

Note: Setting this to "true" requires JDK 1.4 if the encoding differs from the VM's platform default encoding, as JDK 1.3's URLDecoder class does not offer a way to specify the encoding.

Only relevant for the "cacheMappings" setting.

See Also:

setCacheMappings(java.util.Properties), UrlPathHelper.setUrlDecode(boolean)

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setUrlPathHelper

public void setUrlPathHelper(UrlPathHelper urlPathHelper)

Set the UrlPathHelper to use for resolution of lookup paths.

Use this to override the default UrlPathHelper with a custom subclass, or to share common UrlPathHelper settings across multiple HandlerMappings and MethodNameResolvers.

Only relevant for the "cacheMappings" setting.

See Also:

setCacheMappings(java.util.Properties), AbstractUrlHandlerMapping.setUrlPathHelper(org.springframework.web.util.UrlPathHelper), AbstractUrlMethodNameResolver.setUrlPathHelper(org.springframework.web.util.UrlPathHelper)

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setCacheMappings

public void setCacheMappings(Properties cacheMappings)

Map specific URL paths to specific cache seconds.

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

Supports direct matches, e.g. a registered "/test" matches "/test", and a various Ant-style pattern matches, e.g. a registered "/t*" matches both "/test" and "/team". For details, see the AntPathMatcher javadoc.

Parameters:

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

See Also:

WebContentGenerator.setCacheSeconds(int), AntPathMatcher

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setPathMatcher

public void setPathMatcher(PathMatcher pathMatcher)

Set the PathMatcher implementation to use for matching URL paths against registered URL patterns, for determining cache mappings. Default is AntPathMatcher.

See Also:

setCacheMappings(java.util.Properties), AntPathMatcher

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preHandle

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

Description copied from interface: HandlerInterceptor

Intercept 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 a HTTP error or writing a custom response.

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

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lookupCacheSeconds

protected Integer lookupCacheSeconds(String urlPath)

Look up a cache seconds value for the given URL path.

Supports direct matches, e.g. a registered "/test" matches "/test", and various Ant-style pattern matches, e.g. a registered "/t*" matches both "/test" and "/team". For details, see the AntPathMatcher class.

Parameters:

urlPath - URL the bean is mapped to

Returns:

the associated cache seconds, or null if not found

See Also:

AntPathMatcher

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postHandle

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

This implementation is empty.

Specified by:

postHandle in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

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

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

Throws:

Exception - in case of errors

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afterCompletion

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

This implementation is empty.

Specified by:

afterCompletion in interface HandlerInterceptor

Parameters:

request - current HTTP request

response - current HTTP response

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

ex - exception thrown on handler execution, if any

Throws:

Exception - in case of errors

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