如何在Grails 3中使用过滤器而不是拦截器？

Question

Grails 3在“ Interceptors vs Filters ”下的文档说：

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.

我有一个很大的Grails 2.5应用程序迁移到Grails 3.2，并希望继续使用过滤器。

如何使过滤器在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'并将过滤器类从grails-app/conf移出grails-app/conf到grails-app/controllers ，但是随后出现以下异常：

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

相同的文档sez：

这些仍然受支持

这意味着您仍然可以按原样使用它们。 弃用意味着您应该开始考虑将其替换为拦截器。