如何在Grails 3中使用過濾器而不是攔截器？

Question

Grails 3在“ Interceptors vs Filters ”下的文檔說：

In versions of Grails prior to Grails 3.0, Grails supported the notion of filters. These are still supported for backwards compatibility but are considered deprecated.

我有一個很大的Grails 2.5應用程序遷移到Grails 3.2，並希望繼續使用過濾器。

如何使過濾器在Grails 3. *中工作？

按照[ http://docs.grails.org/latest/guide/upgrading.html] ，我添加了compile 'org.grails:grails-plugin-filters:3.0.12'並將過濾器類從grails-app/conf移出grails-app/conf到grails-app/controllers ，但是隨后出現以下異常：

java.lang.NullPointerException: null
    at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1337)
    at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1197)
    at java.beans.Introspector.getBeanInfo(Introspector.java:426)
    at java.beans.Introspector.getBeanInfo(Introspector.java:173)
    at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:3318)
    at java.security.AccessController.doPrivileged(Native Method)
    at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3316)
    at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3293)
    at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:260)
    at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:302)
    at org.grails.plugins.web.filters.FilterToHandlerAdapter.$getStaticMetaClass(FilterToHandlerAdapter.groovy)
    at org.grails.plugins.web.filters.FilterToHandlerAdapter.<init>(FilterToHandlerAdapter.groovy:63)
    at org.grails.plugins.web.filters.FiltersGrailsPlugin.reloadFilters(FiltersGrailsPlugin.groovy:195)
    at org.grails.plugins.web.filters.FiltersGrailsPlugin.doWithApplicationContext(FiltersGrailsPlugin.groovy:72)
    at org.grails.plugins.DefaultGrailsPlugin.doWithApplicationContext(DefaultGrailsPlugin.java:523)
    at org.grails.plugins.AbstractGrailsPluginManager.doPostProcessing(AbstractGrailsPluginManager.java:224)
    at grails.boot.config.GrailsApplicationPostProcessor.onApplicationEvent(GrailsApplicationPostProcessor.groovy:246)
    at grails.boot.config.GrailsApplicationPostProcessor.onApplicationEvent(GrailsApplicationPostProcessor.groovy)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:383)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:337)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:882)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:144)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:372)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:83)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:388)
    at grails.boot.GrailsApp.run(GrailsApp.groovy:375)
    at grails.boot.GrailsApp$run.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
    at app6.Application.main(Application.groovy:8)

Answer 1

相同的文檔sez：

這些仍然受支持

這意味着您仍然可以按原樣使用它們。 棄用意味着您應該開始考慮將其替換為攔截器。