jsp不能显示图片,CSS

通过
<img src=/file/name.jpg>
<img src=file/name.jpg>
<img src=../file/name.jpg>
不能显示出图片

<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

要加上以上代码,并用
<img src="<%=basePath%>admin/image/arrright.jpg" />
才能

CSS文件也是一样

<link href="<%=basePath%>admin/css/admin.css" media="all" rel="stylesheet" />