page
directive specifies the attributes for a jsp page, like importing
packages, content type, output buffer size etc.,
Syntax
<%@
page [attribute="value" attribute="value"
...] %>
Example
<%@page
contentType="text/html" pageEncoding="UTF-8"%>
Below
program generates a random number by instantiating Random class.
random.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <%@page import="java.util.*"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Generate Random Number</title> </head> <body> <h1>Random Number: <% Random rand = new Random(); out.print(rand.nextInt()); %> </h1> </body> </html>
Output
As
you observe the above program, it imported java.util package by using
page directive.
<%@page
import="java.util.*"%>
You
can import multiple packages in jsp by comma separted.
<%@page
import="java.util.*, java.io.*"%>
Attributes
supported by page directive
| Attribute | Description |
| autoFlush | It accept two values true/false. By default it is true. If autoFlush set to true, then the buffered output should be flushed automatically when the buffer filled. If it set to false, then an exception is raised to indicate buffer overflow. |
| buffer | Specifies the size of output buffer in kilo bytes. Depending upon the value of the autoFlush attribute, the contents of this buffer is either automatically flushed, or an exception is raised, when overflow would occur. Default buffer size is 8kb. |
| contentType | Specifies the
MIME type and character encoding for the response of the JSP page. |
| errorPage | Specifies another jsp page url to handle any uncaught exceptions. The other JSP page must specify isErrorPage="true" in its page directive. |
| extends | Specifies the super class of this jsp page. The value is a fully qualified java class file name. |
| import | Used to import oackages and classes. Packages java.lang.*, javax.servlet.*, javax.servlet.jsp.*, and javax.servlet.http.* are imported implicitly by the JSP container. |
| info | You can get this string message using Servlet.getServletInfo method. |
| isELIgnored |
Defines
whether Expression Language (EL) expressions are ignored or
recognized for this page and translation unit. If isELIgnored is
set to true, then EL expressions are ignored, else recognized.
|
| isErrorPage | If it is set to true, then this jsp page can be used as other jsp error page. |
| language | Specifies the scripting language to be used in the scriptlets expression scriptlets, and declarations within the body of the translation unit. Currently the only valid value for this attribute is java. |
| pageEncoding |
Describes
the character encoding for the JSP page. For JSP pages in standard
syntax, the character encoding for the JSP page is the charset
given by the pageEncoding attriute if it is present, otherwise the
charset given by the contentType attribute if it is present,
otherwise “ISO-8859-1”.
|
| session | Specifies whether jsp page requires an http session. If the value is true, then the generated servlet will contain code that causes an HTTP session to be created or accessed, if it already exists. The default value is true. |
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