"Original" Personal summary of Java Ultra-detailed Struts2 interceptor usage and interception stack configuration

Struts2 's interceptor is a good weapon! In particular, custom interceptors, the following is my personal collation of the entire process, I hope to bring you help, there is a better view of the hope that can provide valuable advice.

Principle:

A) The Web browser sends the request

b) First through a set of Struts2 default interception stacks dispatcher (or servletfilter)

c) Custom Interceptor (Interceptor)

D) Action

e) Result

The Struts.xml configuration is as follows:

< Packagename= "Default"namespace= "/"extends= "Struts-default" ><--All configurations should be placed in the package-->    <Interceptors>        <-- All interceptor custom configurations and references, and the definition of blocked stacks should be placed in the interceptors->        <-- Custom Interceptor Name specifies the reference name of the custom interceptor class specifies the implementation class for the Interceptor (full path)-->        <Interceptorname= "Sessioncheck"class= "Com.cqrcb.perinvite.interceptor.AuthorityInterceptor" />                 <-- Custom Block Stack name specifies the reference name of the custom interception stack-->                    <Interceptor-stackname= "Sessioncheckstack">                        <-- The reference name for the interceptor to be referenced has just defined an interceptor named Sessioncheck, and the reference is sessioncheck-->                         <-- each custom intercept stack should be equipped with the Defaultstack intercept stack, which is the STRUTS2 default interception stack, which encapsulates a set of interceptors-> <Interceptor-refname= "Defaultstack" />                        <Interceptor-refname= "Sessioncheck" />        </Interceptor-stack>    </Interceptors>    < --  Configure the global Default action-->    <Default-action-refname= "Indexaction" />         < -- Configuring the global default result-->                <Global-results>                    <-- Configure the Invalid.token return view of token, that is, when the page repeats, the page will automatically go to the/error.jsp page and prompt-->                    <resultname= "Invalid.token">/error.jsp</result>                    <resultname= "Error">/error.jsp</result>                                        <-- Configure Resule with name Backhome, redirect to indexaction-->                    <resultname= "Backhome"type= "Redirectaction">Indexaction</result>                    <-- Configure the Resule for name Testchain, forward to testaction-->                    <resultname= "Testchain"type= "Chain">Testaction</result>    </Global-results>    < --There are two ways to use interceptors, annoction (annotations) and XML configuration, the following is the XML configuration-->                <Actionname= "Testaction"class= "Com.cqrcb.perinvite.resume.action.testAction">                    <-- introduce the Sessioncheckstack intercept stack name to the reference name defined for the interception stack before this action access-->                    <-- This sessioncheckstack already contains the default interceptor stack for custom interceptors and Struts2, so you can refer to Sessioncheckstack directly-->                    <Interceptor-refname= "Sessioncheckstack"/>                                        <-- If you refer to a custom interceptor directly, which does not contain the default interception stack, you need to refer to the STRUTS2 default intercept stack, the following-->                    <Interceptor-refname= "Testinter"/><interceptor-ref name= "Defaultstack"/><--an action as long as there is a defaultstack, if the reference to the interception stack has defaultstack, you do not have to refer to Defaultstack, otherwise, cited--><resultname= "Success">success.jsp</result>                        <resultname= "Input">input.jsp</result>    </Action></ Package>

Using interceptors and interception stacks in annoction annotations

// write directly to the upper end of the class name, specifying the name of the interceptor to be introduced in value @InterceptorRef (value= "token")// intercept stack reference, The blue font is the reference name of the interception stack @InterceptorRefs (@InterceptorRef ("Sessioncheckstack"))

JavaBean of Custom Interceptors

 PackageCom.cqrcb.perinvite.interceptor;Importcom.cqrcb.perinvite.logon.action.IndexAction;ImportCom.netbank.pub.vo.core.PbClientInfoVO;ImportCom.opensymphony.xwork2.ActionContext;Importcom.opensymphony.xwork2.ActionInvocation;ImportCom.opensymphony.xwork2.interceptor.AbstractInterceptor;/*** permission to intercept action *@authorWangyupeng **///inheriting the Abstractinterceptor class Public classAuthorityinterceptorextendsabstractinterceptor{Private Static Final LongSerialversionuid = 4546936882066035745L; //overriding the Intercept method     PublicString Intercept (actioninvocation invocation)throwsException {//get the action's intercept pathActioncontext ax =Invocation.getinvocationcontext (); //Get Action ObjectObject action =invocation.getaction (); //Indexaction does not do this intercept action instanceof Indexaction interpreted as if an instance of action is Indexaction        if(Actioninstanceofindexaction) {              //if it is indexaction, execute it, not intercept .            returnInvocation.invoke (); }         //gets the object of key pinfo in sessionPbclientinfovo pinfo = (Pbclientinfovo) ax.getsession (). Get ("pinfo"); if(pinfo==NULL){            //if pinfo is null, the view that the global result is Backhone is returned            return"Backhome"; }        //If neither is false, no interception is done        returnInvocation.invoke (); }       }

There are many ways to struts2 a custom interceptor, and the content of this article is a pre-intercept, which is the interception of the request that gets to the action. Struts2 also have back-intercept and intermediate interception, these two are also very common, have time to finish after finishing I will send to the blog, we discuss together.

"Original" Personal summary of Java Ultra-detailed Struts2 interceptor usage and interception stack configuration