'page'
directive provides two attributes 'buffer' and 'autoFlush' which
Specifies the buffering model for the initial out
JspWriter to handle content output from the page.
buffer
The
value for this attribute must specified in kilobytes(kb). You can set
'buffer' to 'none' also. If buffer sets to none, then
there is no buffering and all output is written directly through to
the ServletResponse PrintWriter.
autoFlush
Specifies
whether the buffered output should be flushed automatically
(true value) when the buffer is filled, or whether an exception
should be raised (false value) to indicate buffer overflow. By
default 'autoFlush' set to true.
Lets
see the different combinations
| buffer | autoFlush | Description |
| none | true. |
Data
written to the servlet response output stream
as
soon as they are generated. |
| none | false. | It is illegal, resulting in a translation error, to set autoFlush to false when buffer=none. |
| 10kb | true. | Whenever the buffer filled, it flushes the data automatically. |
| 10kb | false. | Whenever the buffer filled, an exception raised to indicate bufferflow. |
<%@page language="java" contentType="text/html" pageEncoding="UTF-8"%> <%@page import="java.util.Random, java.io.*" %> <%@page buffer ="10kb" autoFlush="false"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Hello World</title> </head> <body> <h1> <% for(int i=0; i<9999999; i++){ out.println("i"); } %> </h1> </body> </html>
Above
jsp sets the buffer size to '10kb' and autoFlush to false. So
whenever the buffer fills, it throws exception to indicate Buffer
overflow.
Sample
Output
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