十三、struts2使用自定义拦截器

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一、接文章十二在struts-demo.xml中，声明拦截器、定义拦截器栈xml配置如下：

<!-- 声明拦截器 --><interceptors><interceptor name="mytime" class="interceptor.MyTimeInterceptor"></interceptor><!-- 定义拦拦截器栈 --><interceptor-stack name="myinterceptorstack"><interceptor-ref name="defaultStack"></interceptor-ref><interceptor-ref name="mytime"></interceptor-ref></interceptor-stack></interceptors>

整体xml文件为：

<?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><package name="demo" namespace="" extends="base"><!-- 声明拦截器 --><interceptors><interceptor name="mytime" class="interceptor.MyTimeInterceptor"></interceptor><!-- 定义拦拦截器栈 --><interceptor-stack name="myinterceptorstack"><interceptor-ref name="defaultStack"></interceptor-ref><interceptor-ref name="mytime"></interceptor-ref></interceptor-stack></interceptors><action name="date" class="action.DataTypeConvertAction" ><result name="ok">/dateType.jsp</result></action><action name="fileup" class="action.FileupAction" ><result name="ok">/fileup.jsp</result></action><action name="down" class="action.DownAction" ><result name="ok" type="stream"><!--有输出中文的时使用 param name="contentType">application/octet-stream;charset=utf-8</param -->        <param name="contentType">application/x-msdownload</param>            <param name="inputName">tagFile</param>            <param name="contentDisposition">filename=${filename}</param></result></action></package></struts>

注意：声明拦截器配置必须放在xml最前部分，要定义一个拦截器栈并在栈中将struts2的默认拦截器继承下来因为其他功能都是基于默认拦截器实现的

二、在fileup action 中引用拦截器栈

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

<?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><package name="demo" namespace="" extends="base"><!-- 声明拦截器 --><interceptors><interceptor name="mytime" class="interceptor.MyTimeInterceptor"></interceptor><!-- 定义拦拦截器栈 --><interceptor-stack name="myinterceptorstack"><interceptor-ref name="defaultStack"></interceptor-ref><interceptor-ref name="mytime"></interceptor-ref></interceptor-stack></interceptors><action name="date" class="action.DataTypeConvertAction" ><result name="ok">/dateType.jsp</result></action><action name="fileup" class="action.FileupAction" ><interceptor-ref name="myinterceptorstack"></interceptor-ref><result name="ok">/fileup.jsp</result></action><action name="down" class="action.DownAction" ><result name="ok" type="stream"><!--有输出中文的时使用 param name="contentType">application/octet-stream;charset=utf-8</param -->        <param name="contentType">application/x-msdownload</param>            <param name="inputName">tagFile</param>            <param name="contentDisposition">filename=${filename}</param></result></action></package></struts>

三、根据xml配置建立拦截器实现类MyTimeInterceptor.java 该类实现Interceptor接口代码如下：

package interceptor;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.Interceptor;public class MyTimeInterceptor implements Interceptor {@Overridepublic void destroy() {System.out.println("自定义拦截器销毁！");}@Overridepublic void init() {System.out.println("自定义拦截器初始化!");}@Overridepublic String intercept(ActionInvocation invocation) throws Exception {long star = System.currentTimeMillis();String str = invocation.invoke();// 接着调用后续的拦截器或是ACTIONlong end = System.currentTimeMillis();System.out.println("拦截器执行时间：" + (end - star));return str;}}

项目结构及运行结果如下图：

完成！

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