jsp的base标签路径String BasePath = request.getScheme() + “://" +

作用：当html内部的链接使用相对路径时，都以Base路径为标准进行相对路径转绝对路径的拼接

方法1

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

<base href = "<%= BasePath %>" />

方法2

<base 
href="${pageContext.request.scheme}://${pageContext.request.serverName}:${pageContext.request.serverPort}${pageContext.request.contextPath}/"  />