struts2登陆拦截器 (FIX)

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>

<%@ 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>