By default, if we define an interceptor for an action, the interceptor intercepts all methods in the action. However, in some cases, we do not want to intercept all methods. We only need to intercept some specific methods. In this case, we need to use the method filter feature of the struts2 interceptor.
To implement method filtering, struts2 providesMethodfilterinterceptorAbstract class, which is a subclass of abstractinterceptor. If you need a custom Interceptor to support the method filtering feature, you should inherit methodfilterinterceptor and override it.Dointercept (actioninvocation Invocation)Method.
Index. jsp:
<% @ Page contenttype = "text/html; charset = UTF-8 "pageencoding =" UTF-8 "%> <% @ taglib prefix =" S "uri ="/Struts-tags "%> <HTML>Welcome. jsp:
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>Struts. xml:
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" "http://struts.apache.org/dtds/struts-2.1.7.dtd"><struts> <package name="demo" extends="struts-default"> <interceptors> <interceptor name="methodFilter" class="interceptor.SimpleMethodFilterInterceptor"/> </interceptors> <action name="*" class="action.LoginAndRegisterAction" method="{1}"> <result name="success">/welcome.jsp</result> <result name="error">/index.jsp</result> <interceptor-ref name="defaultStack"/> <interceptor-ref name="methodFilter"> <param name="excludeMethods">register</param> <param name="includeMethods">login</param> </interceptor-ref> </action> </package></struts>Simplemethodfilterinterceptor. Java:
Public class simplemethodfilterinterceptor extends methodfilterinterceptor {@ overridepublic string dointercept (actioninvocation Invocation) throws exception {system. out. println ("before the action is intercepted, of course you can do something here... "); string result = invocation. invoke (); system. out. println ("after the action is intercepted, of course you can do something here... "); return result ;}}Loginandregisteraction. Java:
public class LoginAndRegisterAction extends ActionSupport {private String name;private String pass;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPass() {return pass;}public void setPass(String pass) {this.pass = pass;}public String login(){if(getName().equals("scott")&& getPass().equals("tiger")){Map<String,Object> session=ActionContext.getContext().getSession();session.put("name",getName());session.put("tip","login");return "success";}return "error";}public String register(){if(getName().equals("scott")&& getPass().equals("tiger")){Map<String,Object> session=ActionContext.getContext().getSession();session.put("name",getName());session.put("tip","register");return "success";}return "error";}}
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
