Jsp Class PageContext

PageContext extends JspContext to provide useful context information for when JSP technology is used in a Servlet environment.
A PageContext instance provides access to all the namespaces associated with a JSP page, provides access to several page attributes, as well as a layer above the implementation details. Implicit objects are added to the pageContext automatically.
The PageContext class is an abstract class, designed to be extended to provide implementation dependent implementations thereof, by conformant JSP engine runtime environments. A PageContext instance is obtained by a JSP implementation class by calling the JspFactory.getPageContext() method, and is released by calling JspFactory.releasePageContext().

The PageContext provides a number of facilities to the page/component author and page implementor, including:

● a single API to manage the various scoped namespaces.
● a number of convenience API's to access various public objects.
● a mechanism to obtain the JspWriter for output.
● a mechanism to manage session usage by the page.
● a mechanism to expose page directive attributes to the scripting environment.
● mechanisms to forward or include the current request to other active components in the application.
● a mechanism to handle errorpage exception processing.

Methods Intended for Container Generated Code

Some methods are intended to be used by the code generated by the container, not by code written by JSP page authors, or JSP tag library authors.
The methods supporting lifecycle are initialize() and release()
The following methods enable the management of nested JspWriter streams to implement Tag Extensions: pushBody()

Methods Intended for JSP authors

The following methods provide convenient access to implicit objects: getException(), getPage() getRequest(), getResponse(), getSession(), getServletConfig() and getServletContext().
The following methods provide support for forwarding, inclusion and error handling: forward(), include(), and handlePageException().

Here some Field and there description of jsp PageContext

Field NameSummary
static java.lang.StringAPPLICATION
Name used to store ServletContext in PageContext name table.
Application scope: named reference remains available in the ServletContext until it is reclaimed.
static java.lang.StringCONFIG
Name used to store ServletConfig in PageContext name table.
static java.lang.StringEXCEPTION
Name used to store uncaught exception in ServletRequest attribute list and PageContext name table.
static java.lang.StringOUT
Name used to store current JspWriter in PageContext name table.
static java.lang.StringPAGE
Name used to store the Servlet in this PageContext's nametables.
static intPAGE_SCOPE
Page scope: (this is the default) the named reference remains available in this PageContext until the return from the current Servlet.service() invocation.

Here some Method and there description of jsp PageContext

Method NameSummary
abstract voidforward(java.lang.String relativeUrlPath)
This method is used to re-direct, or "forward" the current ServletRequest and ServletResponse to another active component in the application.
Provides convenient access to error information.
abstract java.lang.ExceptiongetException()
The current value of the exception object (an Exception)
abstract java.lang.ObjectgetPage()
The current value of the page object (In a Servlet environment, this is an instance of javax.servlet.Servlet).
The current value of the request object (a ServletRequest).
The current value of the response object (a ServletResponse).
The ServletConfig instance.
The ServletContext instance.
The current value of the session object (an HttpSession).
abstract voidhandlePageException(java.lang.Exception e)
This method is intended to process an unhandled 'page' level exception by forwarding the exception to the specified error page for this JSP.
abstract voidhandlePageException(java.lang.Throwable t)
This method is intended to process an unhandled 'page' level exception by forwarding the exception to the specified error page for this JSP.

References : oracle share on :        :  

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