What is a buffer
Buffer: Buffer, the so-called buffer is an area of memory used to store temporary data.
Two out objects
The out object is an instance of the JspWrite class, which is a commonly used object for outputting content to the browser.
Three common methods
Four examples
<%@
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
>
outbuilt-in object
</
h1
>
<%
out.println(
"<h2>Silent Night Thoughts</h2>"
);
out.println(
"Moonlight in front of the bed<br>"
);
out.println(
"Suspected to be frost on the ground<br>"
);
out.flush();
//out.clear();//An exception will be thrown here.
out.clearBuffer();
//No exception will be thrown here.
out.println(
"Look up at the moon<br>"
);
out.println(
"Looking down and thinking about my hometown<br>"
);
%>
Buffer size:
<%=
out.getBufferSize()
%>
byte
<
br
>
Buffer remaining size:
<%=
out.getRemaining()
%>
byte
<
br
>
Whether to automatically flush the buffer:
<%=
out.isAutoFlush()
%>
<
BR
>
</
body
>
</
html
>
Five running results
