一 什么是缓冲区
缓冲区：Buffer，所谓缓冲区就是内存的一块区域用来保存临时数据。
二 out对象
out对象是JspWrite类的实例，是向浏览器输出内容常用的对象。
三 常用方法
四 实例
<%@
page
language
=
"java"
import
=
"java.util.*"
contentType
=
"text/html; charset=utf-8"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!
DOCTYPE
HTML
PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN">
<
html
>
<
head
>
<
base
href
=
"
<%=
basePath
%>
"
>
<
title
>
My JSP 'index.jsp' starting page
</
title
>
<
meta
http-equiv
=
"pragma"
content
=
"no-cache"
>
<
meta
http-equiv
=
"cache-control"
content
=
"no-cache"
>
<
meta
http-equiv
=
"expires"
content
=
"0"
>
<
meta
http-equiv
=
"keywords"
content
=
"keyword1,keyword2,keyword3"
>
<
meta
http-equiv
=
"description"
content
=
"This is my page"
>
<!--
<link
rel
="
stylesheet
" type="text/
css
"
href
="styles.css">
-->
</
head
>
<
body
>
<
h1
>
out内置对象
</
h1
>
<%
out.println(
"<h2>静夜思</h2>"
);
out.println(
"床前明月光<br>"
);
out.println(
"疑是地上霜<br>"
);
out.flush();
//out.clear();//这里会抛出异常。
out.clearBuffer();
//这里不会抛出异常。
out.println(
"举头望明月<br>"
);
out.println(
"低头思故乡<br>"
);
%>
缓冲区大小：
<%=
out.getBufferSize()
%>
byte
<
br
>
缓冲区剩余大小：
<%=
out.getRemaining()
%>
byte
<
br
>
是否自动清空缓冲区：
<%=
out.isAutoFlush()
%>
<
BR
>
</
body
>
</
html
>
五 运行结果
