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<%@ page language="java" contentType="text/html; charset=UTF-8"
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pageEncoding="UTF-8"%>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title></title>
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<!-- 引入Bootstrap的CSS文件 -->
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<link href="../css/bootstrap.min.css" rel="stylesheet">
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<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
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<style>
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</style>
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</head>
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<body>
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<!-- 导航栏 -->
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<nav class="navbar navbar-inverse" role="navigation">
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<div class="container-fluid">
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<!-- Brand and toggle get grouped for better mobile display -->
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<div class="navbar-header">
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<!-- 折叠按钮，用于在小屏幕设备上显示菜单 -->
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<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
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<span class="sr-only">Toggle navigation</span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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<span class="icon-bar"></span>
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</button>
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<!-- 网站标题 -->
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<a class="navbar-brand" href="#">欢迎登陆图书管理系统</a>
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</div>
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<!-- Collect the nav links, forms, and other content for toggling -->
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<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
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<!-- 左侧导航链接 -->
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<ul class="nav navbar-nav">
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<li><p style="margin-top:25%;color:grey;">借阅者页面<span class="sr-only">(current)</span></p></li>
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</ul>
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<!-- 右侧导航链接 -->
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<ul class="nav navbar-nav navbar-right">
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<li><a href=";">
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<!-- 如果session中没有reader属性，则不显示任何内容；否则显示reader的值 -->
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<%if(session.getAttribute("reader")==null){
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// 空操作
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} else{%>
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<%=session.getAttribute("reader") %>
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<%} %>
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</a></li>
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<!-- 如果session中有reader属性，则显示退出链接；否则显示登录链接 -->
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<%if(session.getAttribute("reader") !=null) {%>
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<li><a href="./exit" target="_parent">退出</a></li>
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<%}else{%>
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<li><a href="04readerFrame.jsp" target="_parent" onClick="">登录</a></li>
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<%}
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%>
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</ul>
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</div>
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</div>
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</nav>
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</body>
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</html>
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