Struts2 之拦截器interceptor（2）

下面开发一个自己的拦截器

1.编写拦截器类

public interface Interceptor extends Serializable {    /**     * Called to let an interceptor clean up any resources it has allocated.     */    void destroy();    /**     * Called after an interceptor is created, but before any requests are processed using     * {@link #intercept(com.opensymphony.xwork2.ActionInvocation) intercept} , giving     * the Interceptor a chance to initialize any needed resources.     */    void init();    /**     * Allows the Interceptor to do some processing on the request before and/or after the rest of the processing of the     * request by the {@link ActionInvocation} or to short-circuit the processing and just return a String return code.     *     * @param invocation the action invocation     * @return the return code, either returned from {@link ActionInvocation#invoke()}, or from the interceptor itself.     * @throws Exception any system-level error, as defined in {@link com.opensymphony.xwork2.Action#execute()}.     */    String intercept(ActionInvocation invocation) throws Exception;}

上面是拦截器的接口  初始化 拦截 销毁  

自己写的拦截器类使用的是抽象的拦截器类继承的方法，仅仅需要实现一个方法就成了

public class SimpleInterceptor extends AbstractInterceptor {String name;public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic String intercept(ActionInvocation arg0) throws Exception {// TODO Auto-generated method stubSystem.out.println("before");String result=arg0.invoke();if(arg0.isExecuted()){System.out.println("isexcuted");}System.out.println("after");return result;}}

目的：为的是测试执行前后的拦截效果,,invoke就执行了

2.写简单的Action

package org.actions;import com.opensymphony.xwork2.ActionSupport;public class TestAction extends ActionSupport {}

什么也没有

3.写配置文件

<?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><constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>      <constant name="struts.devMode" value="false" />    <constant name="struts.i18n.encoding" value="GBK"/>    <package name="actions" extends="struts-default" namespace="/actions">    <interceptors>    <interceptor name="mysimple" class="org.interceptor.SimpleInterceptor">    <param name="name" >拦截器</param></interceptor></interceptors>        <action name="user" class="org.actions.TestAction">    <result >/success.jsp</result>            <interceptor-ref name="defaultStack"/>    <interceptor-ref name="mysimple"/>        </action>           </package></struts>

4.网页--略过了，，可以观察到下面的效果

before
isexcuted
after