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【摘 要】
1，隐含的注释
JSP语法：<%--?内容?--%>
XML语法：无
2，变量或函数的声明
JSP语法:<%!?declaration;[declaration;]+...?%>
例如：
<%!?
???int?i=0;int?a,b,c;
???Color?red=new?Color(255,0,0);
???private?static?final?String?OK="ok";
???public?String?getAnswer(){
???????return?OK;
???}
%>
XML语法：
<jsp:declaration>
????declartion;[declaration;]+...
</jsp:declaration>
例如：
<jsp:declaration>
???int?i=0;int?a,b,c;
???Color?red=new?Color(255,0,0);
???private?static?final?String?OK="ok";
???public?String?getAnswer(){
???????return?OK;
???}
</jsp:declaration>
3，表达式
JSP语法：<%=expression%>
例如：
<%=Math.round(Math.random*100)%>
XML语法：
<jsp:expression>
???expression
</jsp:expression>
例如：
<jsp:expression>
???Math.round(Math.random*100)
</jsp:expression>
4，代码片断
JSP语法：<%?your?java?code?%>
例如：
<%
???String?username=request.getParameter("username").trim();
???String?password=request.getParameter("password").trim();
%>
XMl语法：
<jsp:scriptlet>
???your?java?code
</jsp:scriptlet>
例如：
<jsp:scriptlet>
???String?username=request.getParameter("username").trim();
???String?password=request.getParameter("password").trim();
</jsp:scriptlet>
5，指令：include
JSP语法：<%@include?file="relativeURL"%>
例如：<%@include?file="static_head.html"%>
XML语法：<jsp:directive.include?file="relativeURL"/>
例如：<jsp:directive.include?file="static_head.html"/>
6，指令：page
JSP语法：<%@page?attribtes%>
例如：<%@page?import="java.util.HashMap"%>
XML语法：<jsp:directive.page?attribute/>
例如：<jsp:directive.page?import="java.util.HashMap"/>
7,指令：taglib
JSP语法：<%@taglib?uri="URIForLibrary"?prefix="tagPrefix"%>
XML语法：无
对于jsp操作而言，本来就是xml格式。
下面使用xml表达方式书写一个jsp页面
example.jsp
<jsp:directive.page?contentType="text/html;charset=GBK"?/>
<jsp:directive.page?import="java.util.*,java.text.*"?/>
<jsp:declartion>
????public?String?getCustomDate(Date,date,String?pattern){
????????SimpleDateFormat?format=new?SimpleDateFormat();
????????format.applyPattern(pattern);
????????return?format.format(date);
????}
</jsp:declartion>
<jsp:scriptlet>
????Date?date=(Date)request.getAttribute("date");
????String?dateStr=getCustomDate(date,"yyyy-MM-dd,hh:mm:ss");
</jsp:scriptlet>
<div?style="font-size:11pt">?
??显示时间：<jsp:expression>dateStr</jsp:expression>
</div>
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