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Struts拦截器的第一个案例

2016-11-22 11:51 453 查看

初略计算Action的执行时间

一、创建Web项目

二、导入jar包

    具体配置可以参考博客

三、创建struts.xml文件

四、配置struts(在web.xml中配置过滤器)

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>struts-Interceptor</display-name>

<filter>
<filter-name>mystruts</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>mystruts</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

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

五、建立主页(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>Insert title here</title>
</head>
<body>
<a href="intercepteAction">Action开始执行</a>
</body>
</html>

六、创建Action

(1)创建Action类

import com.opensymphony.xwork2.ActionSupport;

public class IntercepteAction extends ActionSupport {
@Override
public String execute() throws Exception {
for(int i=0;i<10000;i++){
System.out.println("Hello World");
}
return SUCCESS;
}

}

(2)注册Action

<?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Action-->
<action name="intercepteAction" class="IntercepteAction">
<result>/success.jsp</result>
</action>
</package>

</struts>

七、创建success.jsp页面

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
success!
</body>
</html>

八、拦截器

(1)创建拦截器(继承 AbstractInterceptor类 或者 实现 Interceptor接口)

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class TimerInterceptor extends AbstractInterceptor {
@Override
public String intercept(ActionInvocation invocation) throws Exception {
//1.Action开始前
long start=System.currentTimeMillis();//获取当前的毫秒值
//2.执行下一个拦截器,若为最后一个拦截器,则执对应的Action
String result=invocation.invoke();//返回结果视图
//3.Action结束
long end=System.currentTimeMillis();//获取当前的毫秒值
//4.计算Action执行时间
System.out.println("Action执行所用的时间为:"+(end-start));
//5.返回结果
return result;
}

}


(2)注册拦截器

(3)调用拦截器

<?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="timer" class="TimerInterceptor"></interceptor>
</interceptors>
<!-- 注册Action-->
<action name="intercepteAction" class="IntercepteAction">
<!-- 调用拦截器 -->
<interceptor-ref name="timer"></interceptor-ref>
<result>/success.jsp</result>
</action>
</package>
</struts
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