JSP中<base href="<%=basePath%>">的作用
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首先了解是什么是<base href="">
<base href="value">为页面上所有相对 URL 规定基准 URL：
<head> <base href="http://www.w3school.com.cn/i/" /> </head> <body> <img src="eg_smile.gif" /> </body>
定义和用法
href 属性规定页面中所有相对链接的基准 URL。
语法
<base href="value">
属性值
| URL | 作为基准 URL 的绝对 URL（比如 "http://www.example.com/"）。 |
<% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %>
获取当前项目的路径，如：http://localhost:8080/项目名称/。
设置基础路径的,basePath为变量，简单的静态网页的话你设置比如：
<base href="http://www.baidu.com">，那你下面的href属性就会以你上面设的为基准，
如：<a href="http://www.baidu.com/xxx.htm"></a>，你现在就只需要写<a href="xxx.htm"></a>
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学习了
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