拦截器的使用和配置

1、新建拦截器类
  

package com.demo.struts2.common;

import java.util.Map;

import com.demo.struts2.util.Constants;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;


@SuppressWarnings("unchecked")
public class AuthorizationInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 2575538469018873724L;

	public String intercept(ActionInvocation invocation) throws Exception {
		Map session = invocation.getInvocationContext().getSession();
		String username = (String) session.get(Constants.USERNAME_KEY);
		if (null != username && !username.equals("")) {
			// 合法用户
			return invocation.invoke();
		} else {
			System.out.println("拦截器：用户未登录---");
			return Action.LOGIN;
		}
	}
}

2、在struts.xml文件中配置拦截器
  

		<interceptors>
			<!-- 定义一个包含权限控制的拦截器栈 -->
			<interceptor name="authority"
				class="com.demo.struts2.common.AuthorizationInterceptor" />

			<!-- 定义一个包含权限控制的拦截器栈 -->
			<interceptor-stack name="mydefault">
				<interceptor-ref name="defaultStack" />
				<interceptor-ref name="authority" />
			</interceptor-stack>
		</interceptors>

3、指定拦截器的适用范围

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

	<!-- Add packages here -->
	<package name="main" extends="struts-default">
		<action name="index">
			<result>login.jsp</result>
		</action>
		<action name="welcome">
			<result>welcome.jsp</result>
		</action>
		<action name="login" class="loginAction">
			<result name="success">welcome.jsp</result>
			<result name="input">login.jsp</result>
		</action>
		<action name="logout" class="logoutAction">
			<result name="success">login.jsp</result>
		</action>
		<action name="register" class="registerAction">
			<result name="success">login.jsp</result>
			<result name="input">register.jsp</result>
		</action>
	</package>
	<package name="model" extends="struts-default">
		<interceptors>
			<!-- 定义一个包含权限控制的拦截器栈 -->
			<interceptor name="authority"
				class="com.demo.struts2.common.AuthorizationInterceptor" />

			<!-- 定义一个包含权限控制的拦截器栈 -->
			<interceptor-stack name="mydefault">
				<interceptor-ref name="defaultStack" />
				<interceptor-ref name="authority" />
			</interceptor-stack>
		</interceptors>

		<!-- 定义默认拦截器 -->
		<default-interceptor-ref name="mydefault" />

		<!-- 定义全局处理结果 -->
		<global-results>
			<result name="login">login.jsp</result>
		</global-results>

		<action name="address*" class="addressAction">
			<result name="list">address.jsp</result>
			<result name="add">address_add.jsp</result>
			<result name="edit">address_edit.jsp</result>
			<result name="input">address_{1}.jsp</result>
		</action>
		<action name="schedule*" class="scheduleAction">
			<result name="list">schedule.jsp</result>
			<result name="add">schedule_add.jsp</result>
			<result name="edit">schedule_edit.jsp</result>
			<result name="input">schedule_{1}.jsp</result>
		</action>
		<action name="worklog*" class="worklogAction">
			<result name="list">worklog.jsp</result>
			<result name="add">worklog_add.jsp</result>
			<result name="edit">worklog_edit.jsp</result>
			<result name="input">worklog_{1}.jsp</result>
		</action>
		<action name="sms*" class="smsAction">
			<result name="list">sms.jsp</result>
			<result name="add">sms_add.jsp</result>
			<result name="input">sms_{1}.jsp</result>
		</action>
		<action name="notice*" class="noticeAction">
			<result name="list">notice.jsp</result>
			<result name="add">notice_add.jsp</result>
			<result name="edit">notice_edit.jsp</result>
			<result name="input">notice_{1}.jsp</result>
		</action>
		<action name="meeting*" class="meetingAction">
			<result name="list">meeting.jsp</result>
			<result name="add">meeting_add.jsp</result>
			<result name="edit">meeting_edit.jsp</result>
			<result name="input">meeting_{1}.jsp</result>
		</action>
	</package>
</struts>

这样拦截器就使得在model包下的所有跳转都需要经过我们配置的拦截器了