[Jsp] Page directives

Page directives

- The jsp directives are messages that tells the web container how to translate a JSP page into the corresponding servlet

1. Syntax

<%@ directive attribute="value" %>

2. page directive

- The page directive defines attributes that apply to an entire JSP page

2_1. Syntax

<%@ page attribute="value" %>

2_2. Attributes

• import
• contentType
• extends
• info
• buffer
• language
• isELIgnored
• isThreadSafe
• autoFlush
• session
• pageEncoding
• errorPage
• isErrorPage

2_3. How to use

1) import

- It is used to import class, interface or all the members of a package

- It is similar to import keyword in java class 

Example

2) contentType

- The contentType attribute defines the MIME(Multipurpose Internet Mail Extension) type of the HTTP response

- Default value is "text/html; charset-ISO-8859-1"

Example

- When I reload the welcome.jsp page, welcome.jsp page is downloaded

3) buffer

- The buffer attribute sets the buffer size in kilobytes to handle output generated by the JSP page

- The default size of the buffer is 8Kb

Example

4) isELIgnored

 - We can ignore the Expression Language(EL) in jsp by the isELIgnored attribute

- By default its value is false i.e. Expression Language is enabled by default

Example

5) errorPage

- The errorPage attribute is used to define the error page, if exception occurs in the current page, it will be redirected to the error page

Example

6) isErrorPage

- This attribute is used to declare that the current page is the error page

Example