【 Struts2 过滤器】

LoginInterceptor

package k.util;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
import org.apache.struts2.ServletActionContext;

import javax.servlet.http.HttpServletRequest;

public class LoginInterceptor extends MethodFilterInterceptor {
    @Override
    protected String doIntercept(ActionInvocation actionInvocation) throws Exception {
        HttpServletRequest request = ServletActionContext.getRequest();
        Object name = request.getSession().getAttribute("name");
         return name == null ? "toLogin" : actionInvocation.invoke();
    }
}

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
        "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
    <constant name="struts.i18n.encoding" value="UTF-8"></constant>
    <package name="struts2-hibernate" extends="struts-default" namespace="/">
        <interceptors>
            <interceptor name="LoginInterceptor" class="k.util.LoginInterceptor">
                <param name="excludeMethods">toLogin,login</param>
            </interceptor>
        </interceptors>
        <action name="student_*" class="k.action.StudentAction" method="{1}">
            <interceptor-ref name="LoginInterceptor"></interceptor-ref>
            <interceptor-ref name="defaultStack"></interceptor-ref>
            <result name="list" type="redirectAction">student_list</result>
            <result name="toList">/WEB-INF/student/list.jsp</result>
            <result name="toAdd">/WEB-INF/student/add.jsp</result>
            <result name="toUpdate">/WEB-INF/student/update.jsp</result>
            <result name="toLogin">/WEB-INF/student/login.jsp</result>
        </action>
    </package>
</struts>