分析：
需要自定義攔截器：除了登陸頁面外的，都需要已登陸狀態
1編寫攔截器
package cn.itheima.web.interceptor;
import java.util.Map;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
public class LoginInterceptor extends MethodFilterInterceptor{
//登陸攔截器、如果沒有登陸，重定向到登陸頁面
protected String doIntercept(ActionInvocation invocation) throws Exception {
//1獲取session
//2獲取session中的User對象
Object user = ActionContext.getContext().getSession().get("User");
//3判斷User對象是否爲空，如果爲空即沒有登陸，如果不爲空，放心
if(user==null) {
return "toLogin";
}else {
return invocation.invoke();
}
}
}
<?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>
<!-- 指定struts2是否以開發模式運行
1.熱加載主配置.(不需要重啓即可生效)
2.提供更多錯誤信息輸出,方便開發時的調試
-->
<constant name="struts.devMode" value="true"></constant>
<package name="crm" namespace="/" extends="struts-default" >
<!-- 配置自定義攔截器 -->
<interceptors>
<!-- 1註冊攔截器 -->
<interceptor name="LoginInterceptor" class="cn.itheima.web.interceptor.LoginInterceptor"></interceptor>
<!-- 2註冊攔截器棧 -->
<interceptor-stack name="myStack">
<interceptor-ref name="LoginInterceptor">
<param name="excludeMethods">login</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
</interceptor-stack>
</interceptors>
<!-- 指定包中默認攔截器 -->
<default-interceptor-ref name="myStack"></default-interceptor-ref>
<!-- 定義全局結果集 -->
<global-results>
<result name="toLogin" type="redirect">/login.jsp</result>
</global-results>
<!-- 如果出現java.lang.RuntimeException異常,就將跳轉到名爲error的結果 -->
<global-exception-mappings>
<exception-mapping result="error" exception="java.lang.RuntimeException"></exception-mapping>
</global-exception-mappings>
<action name="CustomerAction_*" class="cn.itheima.web.action.CustomerAction" method="{1}" >
<result name="list" >/jsp/customer/list.jsp</result>
<result name="toList" type="redirectAction">
<param name="actionName">CustomerAction_list</param>
<param name="namespace">/</param>
</result>
</action>
<action name="UserAction_*" class="cn.itheima.web.action.UserAction" method="{1}" >
<result name="toHome" type="redirect">/index.htm</result>
<result name="error" >/login.jsp</result>
</action>
</package>
</struts>可以利用頁面加載事件，把框架中的login.jsp單獨顯示
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/frameset.dtd">
<HTML xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<META http-equiv=Content-Type content="text/html; charset=utf-8">
<STYLE type=text/css>
BODY {
FONT-SIZE: 12px; COLOR: #ffffff; FONT-FAMILY: 宋體
}
TD {
FONT-SIZE: 12px; COLOR: #ffffff; FONT-FAMILY: 宋體
}
</STYLE>
<META content="MSHTML 6.00.6000.16809" name=GENERATOR>
<script type="text/javascript">
window.οnlοad=function(){
if(window.parent != window){// 如果是在框架中
//就讓框架頁面跳轉到登陸頁面
window.parent.location.href = "${pageContext.request.contextPath}/login.jsp";
}
};
</script>
</HEAD>
<BODY>
<FORM id=form1 name=form1 action="${pageContext.request.contextPath}/UserAction_login" method=post>
<DIV id=UpdatePanel1>
<DIV id=div1
style="LEFT: 0px; POSITION: absolute; TOP: 0px; BACKGROUND-COLOR: #0066ff"></DIV>
<DIV id=div2
style="LEFT: 0px; POSITION: absolute; TOP: 0px; BACKGROUND-COLOR: #0066ff"></DIV>
<DIV> </DIV>
<DIV>
<TABLE cellSpacing=0 cellPadding=0 width=900 align=center border=0>
<TBODY>
<TR>
<TD style="HEIGHT: 105px"><IMG src="images/login_1.gif"
border=0></TD></TR>
<TR>
<TD background=images/login_2.jpg height=300>
<TABLE height=300 cellPadding=0 width=900 border=0>
<TBODY>
<TR>
<TD colSpan=2 height=35></TD></TR>
<TR>
<TD width=360></TD>
<TD>
<TABLE cellSpacing=0 cellPadding=2 border=0>
<TBODY>
<TR>
<TD style="HEIGHT: 28px" width=80>登 錄 名：</TD>
<TD style="HEIGHT: 28px" width=150><INPUT id=txtName
style="WIDTH: 130px" name="user_code"></TD>
<TD style="HEIGHT: 28px" width=370><SPAN
id=RequiredFieldValidator3
style="FONT-WEIGHT: bold; VISIBILITY: hidden; COLOR: white">請輸入登錄名</SPAN></TD></TR>
<TR>
<TD style="HEIGHT: 28px">登錄密碼：</TD>
<TD style="HEIGHT: 28px"><INPUT id=txtPwd style="WIDTH: 130px"
type=password name="user_password"></TD>
<TD style="HEIGHT: 28px"><SPAN id=RequiredFieldValidator4
style="FONT-WEIGHT: bold; VISIBILITY: hidden; COLOR: white">請輸入密碼</SPAN></TD></TR>
<TR>
<TD style="HEIGHT: 28px">驗證碼：</TD>
<TD style="HEIGHT: 28px"><INPUT id=txtcode
style="WIDTH: 130px" name=txtcode></TD>
<TD style="HEIGHT: 28px"> </TD></TR>
<TR>
<TD style="HEIGHT: 18px" colspan="2" ><font color="red" ><s:property value="exception.message" /> </font></TD>
<TD style="HEIGHT: 18px"></TD></TR>
<TR>
<TD></TD>
<TD><INPUT id=btn
style="BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px"
type=image src="images/login_button.gif" name=btn>
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD><IMG src="images/login_3.jpg"
border=0></TD></TR></TBODY></TABLE></DIV></DIV>
</FORM>
<s:debug></s:debug>
</BODY></HTML>