在jsp中加入一下代码：
.navbar .nav > li:hover .dropdown-menu {
display: block;
}
全部代码如下所示：
<%@ 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>创新实验学院</title>
<link rel='stylesheet' id='bootstrap-css' href='./css/bootstrap.min.css' type='text/css' rel="stylesheet" />
<link rel='stylesheet' id='fontawesome-css' href='./css/ui/font-awesome/css/font-awesome.min.css' type='text/css' media='all' />
<link rel='stylesheet' id='flexslider-css' href='./css/ui/flexslider/flexslider.css' type='text/css' media='all' />
<link rel='stylesheet' id='zan-css' href='./css/ui/css/zan.css' type='text/css' rel="stylesheet" />
<link rel='stylesheet' id='custom-css' href='./css/ui/css/custom.css' type='text/css' media='all' />
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script type="text/javascript" charset="utf-8" language="javascript" src="./js/bootstrap.min.js"></script>
<style type="text/css">
.fontsize
{
font-size:13px;
color:#fff;
}
.navbar-nav>li>a{
padding-top:5px;
padding-bottom:5px;
padding-left: 10px;
padding-right: 10px;
}
.navbar .nav > li:hover .dropdown-menu {
display: block;
}
.navbar.navbar-inverse{
min-height:40px;
maigin-bottom:10px;
}
.nav.navbar-nav
{
padding-top:5px;
min-height:40px;
}
.container.clearfix {
margin-right: auto;
margin-left: auto;
padding-left: 2px;
padding-right: 2px;
height:40px
}
</style>
</head>
<body style="margin:0">
<div class="header">
<a href="http://www.baidu.com" class="logo" data-toggle="animation"></a>
</div>
<div class="navbar navbar-inverse" style="border-radius:0px;background-image:url(./images/navbg.gif)" >
<div class="container clearfix">
<div class="navbar-header">
<button class="navbar-toggle" type="button" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">下拉框</span>
<span class="fa fa-reorder fa-lg"></span>
</button>
</div>
<nav class="navbar-collapse collapse" style="background-image:url(./images/navbg.gif)">
<ul class="nav navbar-nav">
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://zanwp.com/zanblog3" class="fontsize"><i class="fa fa-home"></i> 首页</a></li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children" style="margin-right:10px"><a class="fontsize"><i class="fa fa-support"></i> 学院概况</a>
<ul class="dropdown-menu">
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">简介</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">沿革</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">学院领导</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">服务指南</a></li>
</ul>
</li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children" style="margin-right:10px"><a class="fontsize"><i class="fa fa-support"></i> 创新实践班</a>
<ul class="dropdown-menu">
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">机电实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">软件工程实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">媒体技术实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">数学建模实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">创业教育实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">创造发明实践班</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">人形机器人实践班</a></li>
</ul>
</li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children" style="margin-right:10px"><a class="fontsize"><i class="fa fa-support"></i>创新创业团队</a>
<ul class="dropdown-menu">
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">拜仁</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">门兴</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">多特</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">沙尔克</a></li>
</ul>
</li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://www.baidu.com" class="fontsize"><i class="fa fa-home"></i>创业孵化园</a></li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://www.baidu.com" class="fontsize"><i class="fa fa-home"></i>创新创业资讯</a></li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://www.baidu.com" class="fontsize"><i class="fa fa-home"></i>教学管理</a></li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://www.baidu.com" class="fontsize"><i class="fa fa-home"></i>党群工作</a></li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children" style="margin-right:10px"><a class="fontsize"><i class="fa fa-support"></i>招生招聘</a>
<ul class="dropdown-menu">
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">招生</a></li>
<li class="menu-item menu-item-type-post_type menu-item-object-post"><a href="#" class="fontsize">招聘</a></li>
</ul>
</li>
<li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-215" style="margin-right:10px"><a href="http://www.baidu.com" class="fontsize"><i class="fa fa-home"></i>文件下载</a></li>
</ul>
</nav>
</div>
</div>
</body>
</html>