Struts2 拦截器demo

计算Action执行时间

思路：执行之后的时间 - 执行之前的时间 = 执行Action消耗的时间
实现步骤：创建拦截器
在配置文件中定义拦截器并引用它

访问路径：http://localhost:8080/struts-timerIntercept/

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计算执行Action花费的时间</title>
</head>
<body>
    <a href="timer">访问Action并计算执行Action花费的时间</a>
</body>
</html>

TimerAction.java

package com.action;

import com.opensymphony.xwork2.ActionSupport;

public class TimerAction extends ActionSupport {
    @Override
    public String execute() throws Exception {
        for(int i=0; i<1000; i++){
            System.out.println("wow！！！");
        }
        return SUCCESS;
    }
}

TimerInterceptor.java

package com.interceptor;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
/*
 *计算执行Action花费的时间 
 */
public class TimerInterceptor extends AbstractInterceptor {

    @Override
    public String intercept(ActionInvocation invocation) throws Exception {
        //1.执行Action之前
        long start = System.currentTimeMillis();
        //2.执行下一个拦截器，如果已经是最后一个拦截器，则执行目标Action
        String reslut = invocation.invoke();
        //3.执行Action之后
        long end = System.currentTimeMillis();
        System.out.println("执行Action花费的时间: " + (end - start) + "ms");
        return reslut;
    }

}

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>
    <package name="default" namespace="/" extends="struts-default">
        <!-- 注册拦截器 -->
        <interceptors>
            <interceptor name="mytimer" class="com.interceptor.TimerInterceptor"></interceptor>
        </interceptors>
        
        <action name="timer" class="com.action.TimerAction">
            <result>/success.jsp</result>
            <!-- 引用拦截器 -->
            <interceptor-ref name="mytimer"></interceptor-ref>
        </action>
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Struts Blank</display-name>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

目录结构：

posted @ 2016-07-27 15:30 smilelily126 阅读(743) 评论(1) 编辑收藏举报

smilelily126

Struts2 拦截器demo

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