JSP directives

What are JSP directives?

• JSP directives are messages for the JSP engine. i.e., JSP directives serve as a message from a JSP page to the JSP container and control the processing of the entire page
• They are used to set global values such as a class declaration, method implementation, output content type, etc.
• They do not produce any output to the client.
• Directives are always enclosed within <%@ ….. %> tag.
• Ex: page directive, include directive, etc.

11.What is page directive?

• A page directive is to inform the JSP engine about the headers or facilities that page should get from the environment.
• Typically, the page directive is found at the top of almost all of our JSP pages.
• There can be any number of page directives within a JSP page (although the attribute – value pair must be unique).
• The syntax of the include directive is: <%@ page attribute="value">
• Example:<%@ include file="header.jsp" %>

12.What are the attributes of page directive?

There are thirteen attributes defined for a page directive of which the important attributes are as follows:

• import: It specifies the packages that are to be imported.
• session: It specifies whether a session data is available to the JSP page.
• contentType: It allows a user to set the content-type for a page.
• isELIgnored: It specifies whether the EL expressions are ignored when a JSP is translated to a servlet.

13.What is the include directive?

There are thirteen attributes defined for a page directive of which the important attributes are as follows:

• The include directive is used to statically insert the contents of a resource into the current JSP.
• This enables a user to reuse the code without duplicating it, and includes the contents of the specified file at the translation time.
• The syntax of the include directive is as follows:
• <%@ include file = "FileName" %>
• This directive has only one attribute called file that specifies the name of the file to be included.