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struts2.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>
<!-- 覆盖掉Struts2一些常量的默认值 -->
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />
<constant name="struts.action.extension" value="action,,do"></constant>
<constant name="struts.configuration.xml.reload" value="true"></constant>
<constant name="struts.locale" value="zh_CN"></constant>
<package name="mydefaultpackage" extends="struts-default">
<interceptors><!-- 只是定义拦截器 -->
<interceptor name="timeCost" class="com.itheima.interceptor.TimeCostInterceptor"></interceptor>
<interceptor name="loginCheck" class="com.itheima.interceptor.LoginCheckInterceptor">
<param name="excludeMethods">sayHello1</param><!-- 排除在拦截之外 -->
</interceptor>
<!-- 定义小组 -->
<interceptor-stack name="mydefaultStack">
<interceptor-ref name="annotationWorkflow"></interceptor-ref>
<!-- <interceptor-ref name="loginCheck"></interceptor-ref> -->
<interceptor-ref name="timeCost"></interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
<default-interceptor-ref name="mydefaultStack"></default-interceptor-ref>
</package>
<package name="p1" extends="mydefaultpackage">
<action name="test1" class="com.itheima.actions.ActionDemo1">
<result>/index.jsp</result>
<result name="loginCheckFailure">/failure.jsp</result>
</action>
<action name="test2" class="com.itheima.actions.ActionDemo2">
<result>/index.jsp</result>
</action>
</package>
</struts>
TimeCostInterceptor
package com.itheima.interceptor;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;
//统计动作方法执行效率的拦截器
public class TimeCostInterceptor extends AbstractInterceptor {
//核心拦截方法
public String intercept(ActionInvocation invocation) throws Exception {
long startTime = System.nanoTime();//纳秒： 1s=1000000000纳秒
String result = invocation.invoke();//让下一个执行
long endTime = System.nanoTime();
System.out.println(invocation.getInvocationContext().getName()+" cost time :"+(endTime-startTime)+" ns");
return result;
}
}
LoginCheckInterceptor
package com.itheima.interceptor;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
public class LoginCheckInterceptor extends MethodFilterInterceptor {
protected String doIntercept(ActionInvocation invocation) throws Exception {
String user = (String)ServletActionContext.getRequest().getSession().getAttribute("user");
String result = "loginCheckFailure";
if(user!=null){
result = invocation.invoke();
}
return result;
}
}
failure.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
对不起！您没有登陆<a href="${pageContext.request.contextPath}/login.jsp?username=wzhting">登陆</a>
</body>
</html>
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<%
String username = request.getParameter("username");
if(username!=null){
session.setAttribute("user", username);
}else{
session.invalidate();//相当于注销
}
%>
</body>
</html>
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原文地址：http://www.cnblogs.com/vaer/p/4691677.html
