struts2拦截器

拦截器:

三种方法实现拦截器

①实现接口

interceptor

②扩展类

package com.mynews.intercept;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class TimerIntercept extends AbstractInterceptor {

/**

*

*/

private static final long serialVersionUID = 1L;

@Override

public String intercept(ActionInvocation invocation) throws Exception {

long start=System.currentTimeMillis();

String result=invocation.invoke();//继续执行下一个拦截器,后续拦截器执行完之后才继续向下执行

long end=System.currentTimeMillis();

System.out.println(end-start);

return result;

}

}

<package name="news" namespace="/news" extends="struts-default">

<!-- 声明一个拦截器 -->

<interceptors>

<interceptor name="timer" class="com.mynews.intercept.TimerIntercept"></interceptor>

<interceptor-stack name="mystack"><!-- 将拦截器放入栈中 -->

<interceptor-ref name="timer"></interceptor-ref> <!--自己定义的拦截器-->

<interceptor-ref name="defaultStack"></interceptor-ref><!-- 引入系统默认的拦截器 -->

</interceptor-stack>

</interceptors>

<!-- 将拦截器装备到action -->

<default-interceptor-ref name="mystack"></default-interceptor-ref>

<action name="*_NewsAction" class="com.mynews.action.NewsAction" method="{1}">

<result name="main" type="dispatcher">/ch01/main.jsp</result>

<!-- <result name="main" type="redirect">/ch01/main.jsp</result> 重定向方法 -->

</action>

</package>

③方法过滤拦截器

package com.mynews.intercept;

import java.util.Map;

import com.mynews.entity.Users;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

public class RoleIntercept extends MethodFilterInterceptor {

/**

* 方法拦截器

*/

private static final long serialVersionUID = 1L;

@Override

protected String doIntercept(ActionInvocation invocation) throws Exception {

String result=null;

ActionContext context=invocation.getInvocationContext();

Map sessionMap=context.getSession();

Users user=(Users) sessionMap.get("users");

if(user==null){

/*

* ServletActionContext.getResponse().sendRedirect("指定页面");

* return null;

* */

return Action.LOGIN;

}else{

result=invocation.invoke();

}

return result;

}

}

<package name="news" namespace="/news" extends="struts-default">

<!-- 声明一个拦截器 -->

<interceptors>

<interceptor name="timer" class="com.mynews.intercept.TimerIntercept"></interceptor>

<!-- 方法拦截器 -->

<interceptor name="role" class="com.mynews.intercept.RoleIntercept">

<param name="excludeMethods">showNews,showNews2</param><!-- 不包含的方法 -->

<param name="includeMethods">searchNewsList</param><!-- 包含的方法 -->

</interceptor>

<interceptor-stack name="mystack"><!-- 将拦截器放入栈中 -->

<interceptor-ref name="timer"></interceptor-ref> <!--自己定义的拦截器-->

<interceptor-ref name="role"></interceptor-ref>

<interceptor-ref name="defaultStack"></interceptor-ref><!-- 引入系统默认的拦截器 -->

</interceptor-stack>

</interceptors>

<!-- 将拦截器装备到action -->

<default-interceptor-ref name="mystack"></default-interceptor-ref>

<!-- 全局的结果 -->

<global-results>

<result name="login">/ch01/login.jsp</result>

</global-results>

<action name="*_NewsAction" class="com.mynews.action.NewsAction" method="{1}">

<result name="main" type="dispatcher">/ch01/main.jsp</result>

<!-- <result name="main" type="redirect">/ch01/main.jsp</result> 重定向方法 -->

</action>

</package>