JSP
1)Java Server Page，在html中嵌入java代码
2)九个内置(隐式)对象
request
response
out
page
pageContext
config
session
application
Exception
3)JSP指令
<%@ page ... %> Page指令，定义页面属性
eg：<%@ page language="java" contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%>
<%@ include ... %> 包含其他文件
eg：<%@ include file="../common/comm.jsp"%>
<%@ taglib ... %> 引入标签库的定义
eg：<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
JSTL
1)JSP Standard Tag Libaray
http://www.runoob.com/jsp/jsp-jstl.html
2)四类标签
核心(core)标签
格式化(format)标签
SQL标签
XML标签
3)标签的使用(以核心标签为例)
a.在web.xml中配置
<jsp-config>
<taglib>
<taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
<taglib-location>/WEB-INF/taglib/c.tld</taglib-location>
</taglib>
</jsp-config>
b.在jsp页面中添加
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
4)核心标签
<c:out ></c:out>
<c:set var="" value="" scope=""/>
scope可选，默认为page
<c:remove var="" scope=""/>
同set
<c:url value="/index.jsp"/>
会自动在value前添加项目名，即project_name/index.jsp，亦等同于${pageContext.request.contextPath}/inedx.jsp的效果
<c:if test="${condition}" val="" scope="">
do something...
</c:if>
<c:choose>
<c:when test="${condition}">
do something...
</d:when>
<c:when test="${condition}">
do something...
</d:when>
<c:when test="${condition}">
do something...
</d:when>
<c:otherwise>
do something...
</d:otherwise>
</c:choose>
<c:forEach var="" items="">
do something...
</c:forEach>
items为传入的集合，val是每一项
EL
1)Expression Language
http://www.runoob.com/jsp/jsp-expression-language.html
2)十一个内置(隐式)对象
pageScope
requestScope
sessionScope
applicationScope
param
paramValues
header
headerValues
initParam
cookie
pageContext
