THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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<package name="default" extends="actionstruts-default"> <interceptors> <interceptor name="timer" class=".."/> <interceptor name="logger" class=".."/> </interceptors> <action name="login" class="tutorial.Login"> <interceptor-ref name="timer"/> <interceptor-ref name="logger"/> <result name="input">login.jsp</result> <result name="success" type="redirect-action">/secure/home</result> </action> </package> |
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With most web applications, we find ourselves wanting to apply the same set of Interceptors over and over again. Rather than reiterate the same list of Interceptors, we can bundle these Interceptors together using an Interceptor Stack.
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<package name="default" extends="actionstruts-default"> <interceptors> <interceptor name="timer" class=".."/> <interceptor name="logger" class=".."/> <interceptor-stack name="myStack"> <interceptor-ref name="timer"/> <interceptor-ref name="logger"/> </interceptor-stack> </interceptors> <action name="login" class="tutuorial.Login"> <interceptor-ref name="myStack"/> <result name="input">login.jsp</result> <result name="success" type="redirect-action">/secure/home</result> </action> </package> |
Looking inside actionstruts-default.xml
, we can see how it's done.
The Default Configuration
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<!DOCTYPE xworkstruts PUBLIC "-//OpenSymphonyApache Software GroupFoundation//XWork 1DTD Struts Configuration 2.0//EN" "http://wwwstruts.opensymphonyapache.comorg/xworkdtds/xworkstruts-12.10.dtd"> <!-- // START SNIPPET: webworkstruts-default --> <xwork><struts> <package name="actionstruts-default"> <result-types> <result-type name="chain" class="com.opensymphony.xwork.ActionChainResult"/> <result-type name="dispatcher" class="org.apache.struts.action2.dispatcher.ServletDispatcherResult" default="true"/> <result-type name="freemarker" class="org.apache.struts.action2.views.freemarker.FreemarkerResult"/> <result-type name="httpheader" class="org.apache.struts.action2.dispatcher.HttpHeaderResult"/> <result-type name="jasper" class="org.apache.struts.action2.views.jasperreports.JasperReportsResult"/> <result-type name="redirect" class="org.apache.struts.action2.dispatcher.ServletRedirectResult"/> <result-type name="redirect-action" class="org.apache.struts.action2.dispatcher.ServletActionRedirectResult"/> <result-type name="stream" class="org.apache.struts.action2.dispatcher.StreamResult"/> <result-type name="velocity" class="org.apache.struts.action2.dispatcher.VelocityResult"/> <result-type name="xslt" class="org.apache.struts.action2.views.xslt.XSLTResult"/> </result-types> <interceptors> <interceptor name="alias" class="com.opensymphony.xwork.interceptor.AliasInterceptor"/> <interceptor name="autowiring" class="com.opensymphony.xwork.spring.interceptor.ActionAutowiringInterceptor"/> <interceptor name="chain" class="com.opensymphony.xwork.interceptor.ChainingInterceptor"/> <interceptor name="component" class="com.opensymphony.xwork.interceptor.component.ComponentInterceptor"/> <interceptor name="conversionError" class="org.apache.struts.action2.interceptor.WebWorkConversionErrorInterceptor"/> <interceptor name="external-ref" class="com.opensymphony.xwork.interceptor.ExternalReferencesInterceptor"/> <interceptor name="execAndWait" class="corg.apache.struts.action2.interceptor.ExecuteAndWaitInterceptor"/> <interceptor name="exception" class="com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor"/> <interceptor name="fileUpload" class="com.opensymphony.webwork.interceptor.FileUploadInterceptor"/> <interceptor name="i18n" class="com.opensymphony.xwork.interceptor.I18nInterceptor"/> <interceptor name="logger" class="com.opensymphony.xwork.interceptor.LoggingInterceptor"/> <interceptor name="model-driven" class="com.opensymphony.xwork.interceptor.ModelDrivenInterceptor"/> <interceptor name="params" class="com.opensymphony.xwork.interceptor.ParametersInterceptor"/> <interceptor name="prepare" class="com.opensymphony.xwork.interceptor.PrepareInterceptor"/> <interceptor name="static-params" class="com.opensymphony.xwork.interceptor.StaticParametersInterceptor"/> <interceptor name="servlet-config" class="org.apache.struts.action2.interceptor.ServletConfigInterceptor"/> <interceptor name="sessionAutowiring" class="org.apache.struts.action2.spring.interceptor.SessionContextAutowiringInterceptor"/> <interceptor name="timer" class="com.opensymphony.xwork.interceptor.TimerInterceptor"/> <interceptor name="token" class="com.opensymphony.webwork.interceptor.TokenInterceptor"/> <interceptor name="token-session" class="com.opensymphony.webwork.interceptor.TokenSessionStoreInterceptor"/> <interceptor name="validation" class="com.opensymphony.xwork.validator.ValidationInterceptor"/> <interceptor name="workflow" class="com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor"/> <!-- Basic stack --> <interceptor-stack name="basicStack"> <interceptor-ref name="exception"/> <interceptor-ref name="servlet-config"/> <interceptor-ref name="prepare"/> <interceptor-ref name="static-params"/> <interceptor-ref name="params"/> <interceptor-ref name="conversionError"/> </interceptor-stack> <!-- Sample validation and workflow stack --> <interceptor-stack name="validationWorkflowStack"> <interceptor-ref name="basicStack"/> <interceptor-ref name="validation"/> <interceptor-ref name="workflow"/> </interceptor-stack> <!-- Sample file upload stack --> <interceptor-stack name="fileUploadStack"> <interceptor-ref name="fileUpload"/> <interceptor-ref name="basicStack"/> </interceptor-stack> <!-- Sample WebWork Inversion of Control stack Note: WebWork's IoC is deprecated - please look at alternatives such as Sprint --> <interceptor-stack name="componentStack"> <interceptor-ref name="component"/> <interceptor-ref name="basicStack"/> </interceptor-stack> <!-- Sample model-driven stack --> <interceptor-stack name="modelDrivenStack"> <interceptor-ref name="model-driven"/> <interceptor-ref name="basicStack"/> </interceptor-stack> <!-- Sample action chaining stack --> <interceptor-stack name="chainStack"> <interceptor-ref name="chain"/> <interceptor-ref name="basicStack"/> </interceptor-stack> <!-- Sample i18n stack --> <interceptor-stack name="chainStack"> <interceptor-ref name="i18n"/> <interceptor-ref name="basicStack"/> </interceptor-stack> <!-- Sample execute and wait stack. Note: execAndWait should always be the *last* interceptor. --> <interceptor-stack name="executeAndWaitStack"> <interceptor-ref name="basicStack"/> <interceptor-ref name="execAndWait"/> </interceptor-stack> <!-- A complete stack with all the common interceptors in place. Generally, this stack should be the one you use, though it may process additional stuff you don't need, which could lead to some performance problems. Also, the ordering can be switched around (ex: if you wish to have your components before prepare() is called, you'd need to move the component interceptor up --> <interceptor-stack name="defaultStack"> <interceptor-ref name="exception"/> <interceptor-ref name="alias"/> <interceptor-ref name="prepare"/> <interceptor-ref name="servlet-config"/> <interceptor-ref name="i18n"/> <interceptor-ref name="chain"/> <interceptor-ref name="model-driven"/> <interceptor-ref name="fileUpload"/> <interceptor-ref name="static-params"/> <interceptor-ref name="params"/> <interceptor-ref name="conversionError"/> <interceptor-ref name="validation"/> <interceptor-ref name="workflow"/> </interceptor-stack> <!-- The completeStack is here for backwards compatibility for applications that still refer to the defaultStack by the old name --> <interceptor-stack name="completeStack"> <interceptor-ref name="defaultStack"/> </interceptor-stack> </interceptors> <default-interceptor-ref name="defaultStack"/> </package> </xwork> <!-- // END SNIPPET: webworkstruts-default --> |
Since we included actionstruts-default.xml
in our actionstrits.xml
, all the predefined interceptors and stacks are available for us to use in our actions.
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