Struts2自定义拦截器

struts.xml  (拦截器必须放进拦截器站（interceptor-stack）中方便调用)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <package name="base" extends="struts-default">
    <interceptors>
        <interceptor name="permission" class="neusoft.interceptor.WebInterceptor"/>
        <interceptor-stack name="permissionStack">
            <interceptor-ref name="defaultStack"/>
            <interceptor-ref name="permission"/>
        </interceptor-stack>
    </interceptors>
        <global-results>
            <result name="fail">login.jsp</result>
        </global-results>    
                
        <action name="Index" class="neusoft.action.LoginAction.Users" method="index">
            <interceptor-ref name="permissionStack"/>
            <result name="success">index.jsp</result>
        </action>
        
    </package>
</struts>    

 

WebInterceptor.java （实现Interceptor借口，“invocation.invoke()”执行Action类方法，并返回一个值）

package neusoft.interceptor;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class WebInterceptor implements Interceptor {

    public void destroy() {
        // TODO Auto-generated method stub
        
    }

    public void init() {
        // TODO Auto-generated method stub
        
    }

    public String intercept(ActionInvocation invocation) throws Exception {
        String admin=(String) ActionContext.getContext().getSession().get("user");
        System.out.println(admin+"...........");
        if(admin!=null){
            return invocation.invoke();
        }    
        return "fail";
    }

}