n 隐藏注释:写在JSP程序中,但不发给客户 <%--commnet--%>
3. 脚本元素
a. 声明(Declaration)
n 声明就是在JSP程序中声明合法变量和方法
eg.1-1
<%!String getDate()
{
return new java.util.Date().toLocaleString();
}
int count=10;
%>
b. 表达式(Expression)
n 表达式就是<%=和%>之间的代码。
c. Scriptlets
n 位于<%和%>之间。是合法的Java代码。
4. 指令元素
a.页面指令
n 格式<%page attribute=”value”…%>
<table style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN-LEFT: 35.45pt; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt; mso-border-alt: solid black 1.5pt" cellSpacing=0 cellPadding=0 border=1>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 1.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: gray; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; mso-shading: white; mso-pattern: solid gray" vAlign=top width=152>
属性
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 1.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: gray; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; mso-shading: white; mso-pattern: solid gray" vAlign=top width=191>
描述
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 1.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: gray; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; mso-shading: white; mso-pattern: solid gray" vAlign=top width=143>
默认值
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 1.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: gray; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; mso-shading: white; mso-pattern: solid gray" vAlign=top width=249>
例子
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black 1.5pt" vAlign=top width=152>
language
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black 1.5pt" vAlign=top width=191>
定义要使用的脚本语言,目前只能是”Java”
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black 1.5pt" vAlign=top width=143>
Java
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black 1.5pt" vAlign=top width=249>
language=”java”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
import
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
和一般的Java import一样,用”,”隔开包或者类列表
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
默认忽略
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
import=”java.io.*,javax.servlet.jsp.*”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
session
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
指定一个Http会话中这个页面是否参与
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
True
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
session=”true”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
buffer
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
指定到客户输出流的缓冲模式,如果是none,则不缓冲,如果指定数值,那么输出就不小于这个值的缓冲区进行缓冲
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
不小于8K,根据不同的服务器可设置
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
Buffer=”64kb”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
autoFlash
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
true缓冲区满时,到客户端输出被刷新;false缓冲区满时,出现运行异常,表示缓冲溢出
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
true
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
autoFlash=”true”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
info
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
关于JSP页面的信息,定义一个字符串,可以使用servlet.getServletInfo()获得
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
默认忽略
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
info=”一个测试页面”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
isErrorPage
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
表明当前页面是否为其他页面的errorPage目标。如果被设置为true,则可以使用exception对象。相反,如果被设置为false,则不可以使用exception对象。
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
false
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
isErrorPage=”false”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
errorPage
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
定义此页面出现异常时调用的页面
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
默认忽略
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
errorPage=”error/error.jsp”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
isThreadSafe
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
用来设置JSP文件是否能多线程使用。如果设置为true,那么一个JSP能够同时处理多个用户的请求;相反只能处理一个用户。
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
true
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
isTreadSage=”true”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
contentTpye
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
定义JSP字符编码和页面响应的MIME类型。
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
TYPE=text/html
CHARSET=iso8859-1
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
contectType=”text/html; charset=gb2312”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
pageEncoding
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
JSP页面的字符编码
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
PageEncoding=
”ISO-8859-1”
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
pageEncoding=”gb2312”
</td></tr>
<tr>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 1.5pt solid; WIDTH: 114.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=152>
IsELIgnored
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 143.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=191>
制定EL(表达式语言)是否被忽略,如果为true,则容器忽略”${}”表达式的计算
</td>
<td style="BORDER-RIGHT: #d4d0c8; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 107.55pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=143>
默认值由web.xml描述文件的版本确定,Servlet2.3以前的版本将忽略
</td>
<td style="BORDER-RIGHT: black 1.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 187.05pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 1.5pt solid; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" vAlign=top width=249>
isELIgnored=”true”
</td></tr></table>
b. include 指令
n 用来插入一个包含文本或代码的文件,这个包含过程是静态的。
n 格式:<%@ include file=”filename”%>
c. taglib 指令
n 这个指令允许页面使用者自定义标签。这里内容不明白,放在后面研究
d. 表达式语言
n JSP2.0新加的技术,可以简化JSP开发,使用”${}”来表示
n ${sessionScipe.test}相当于Session.getAttribute(“test”)
具体内容不清楚,放在后面研究
5. 动作元素
动作元素在请求处理阶段起作用。容器在处理JSP时,每遇到这种动作元素,都根据他的标记进行特殊的处理
常用动作元素
a.
n 用来为其他标签提供附加信息。
n 使用方法:
b.
n 允许在请求时间内在现成的JSP页面里包含静态或动态资源。被包含的对象只有对JspWriter对象的访问权限,并且不能设置头或者Cookie。如果页面输出的是缓冲的,那么缓冲区的刷新要优于包含的刷新。
n 格式:
(这里flush只能使用true)
c.
n 允许将请求转发到另外一个JSP、Servlet或者静态资源文件。
n 格式
(page为一个值或者一个字符串,定向一个文件或URL)
d.
n 和useBean一起协作,用来设置Bena的简单属性和索引属性。
n
n 其中propertyDatails有四种不同的方式:
1. property=”*”
2. Property=”propertyName” param=parameteraName
3. Property=”propertyName”
4. Property=”propertyName” value=propertyValue
注:不能在一个中同时使用param和value。
e.
n 对操作的补充,用来访问一个Bean的属性。它访问的属性值将它转化成一个String,然后发送到输出流中。如果属性是个对象,将调用toString()方法。
n 使用方法:
1.
eg:
n 限制:不能使用来检查一个已经被索引了的属性。这个地方不理解
f.
n 用来在JSP页面中创建一个Bean实例,并且指定他的名字及其作用范围。
n 语法:
n typeSpec可以使用以下四种:
1. class=”className”
2. class=”className” type=”typeName”
3. beanName=”beanName” type=”typeName”
4. type=”typeName”
g. 以后补充
h. 以后补充