jsp el 表达式和 jsp:include page include

The following are reserved words in the JSP EL:
and 
eq
gt
true
instanceof
or
ne
lt
false
empty
not
if
ge
null
div
mod

Expression-Language Implicit Objects
applicationScope
cookie
header
headerValues
initParam
pageContext
pageScope
param
paramValues
requestScope
sessionScope

Custom Tag:
BodyTag interface

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JDBBC: Java Database Connectivity
using the java.sql.DriverManager
The java.sql.DriverManager is a standard part of JDE

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Most of the O/R frameworks support these four approaches, so let's take a look at each one.










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9 implicit objects in JSP:

request
response
out
sessin
application

config
page   :   implicit page object references an instance of the JSP's page impementation.
pageContxt  :  a pageContext instane provides the JSP developer with access to all the 
	available JSP scopes and to serveral useful page attributes, such as the current
	request and response, the ServletContext, HttpSession,ServletConfig to name but a few.
exception  


Directives:
<%@ page import="java.util.Date, java.text.*" pageEncoding="utf-8" %>

<%@ include file="./foot.jsp" %>


In JSP 2.1,there are there types of action elements:
1.Standard actions
2.Customer actions
3.JSTL actions

Standard Actions:
e.g.: Action
the  action will include any output generated by the included resource directly
to the JspWriter assigned to the implicit out variable. This means that you cann specify any 
different type of web resouce, such as another Jsp or servlet, as long as it produces content of 
the same type of web resource,such as another JSP page or servlet, as long as it produces content 
of the same type as the calling JSP page.