Java Server Pages - The directives

Introduction to JSP directives

JSP directives are instructions inserted into special HTML tags. The syntax is as follows:

JSP directives are used to indicate:

the language used

classes to include

classes to extend

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Presentation of JSP directives

The version 1.0 Revision B of Java Server Pages JSP provides three guidelines:

The page directive provides information on the JSP page. This directive has many attributes (explained below):

the include directive to include files in the HTML page

the taglib directive defining the address and prefix of a library of tags that can be used in the page

This directive allows the creation of tags of this form:

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Attributes of the page directive

Here is the list of attributes for the page directive

Attribut Possible values Description language java Specifies the language to be used to process to the instructions of the page. Java is the language used predominantly, but servlets can be written in another language extends packagelass Define the class to be extended, that is to say, the parent class of the servlet generated by JSP import pakage.* Allows you to import a list of classes or packages to top of the page, as for a Java application.. session true>false Sets whether the current page can access the data stored in the session. This attribute is true by default buffer none/8kb/sizekb Sets whether the output stream will be placed in a buffer before sending. Default buffer size is 8kb, but it is possible to set the size in kb. This attribute is used with the autoflush attribute autoflush true>false La valeur true (par défaut) indique que le tampon doit être vidé lorsqu'il est plein isThreadSafe true>false True indicates that multiple clients can simultaneously uses the servlet. If set to false, the servlet switches to monothread mode, which means that only one client can access the servlet at a time. info Text return a description using the servlet.getServletInfo() method. errorPage URL Allows you to specify a JSP page to manage unhandled exceptions. isErrorPage false Specify whether the current page is an error page contentType text/html;charset=ISO-8859-1 Indicates the MIME type of the page as well as the character set used

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