path & basePath
<%
// 当前页面
String path = request.getContextPath();
// 项目根目录
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
head中加入<base href="...">标签用来表明当前页面的相对路径所使用的根路径。
<head>
<base href="<%= basePath %>">
</head>
JSTL
jstl标签不起作用，报错The tag handler class for "c:if" (org.apache.taglibs.standard.tag.rt.core.IfTag) was not found on the Java Build Path
解决方法：
- 在jsp页面开头加上jstl的taglib
- 在page标签中加上属性
isELIgnored="false"
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" isELIgnored="false" %>
SpringMVC REST风格使用DELETE和PUT METHOD时出现HTTP Status 405 – Method Not Allowed
HTTP Status 405 – Method Not Allowed
Type Status Report
Message JSPs only permit GET POST or HEAD
Description The method received in the request-line is known by the origin server but not supported by the target resource.
Apache Tomcat/9.0.0.M22
原因：JSP 2.3只支持GET POST HEAD请求
解决方法：
- 简单解决方法，在被请求的页面
<%@ page %>中添加<%@ page isErrorPage="true" %> - 详细信息参看 stackoverflow - HTTP Status 405 - JSPs only permit GET POST or HEAD
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