What do you know about PageContext and what are the advantages of using it?

PageContext is an abstract class in Java EE that represents the execution context of a JSP page. It provides a unified access point to various scoped objects such as HttpServletRequest, HttpServletResponse, HttpSession, ServletContext, and ServletConfig.

Advantages of using PageContext:

1. Unified access to scoped objects: Simplifies obtaining references to objects available in different scopes (page, request, session, application).
2. Attribute management: Allows setting and getting attributes across all scopes using setAttribute() and getAttribute() methods.
3. Flow control management: Methods like forward() and include() enable programmatic control of redirects and inclusion of other resources.

   // Example of using PageContext to include another page
   try {
       pageContext.include("another_page.jsp");
   } catch (ServletException | IOException e) {
       // handle exceptions
   }
   

4. Creating and using output streams: Provides access to the JspWriter object for writing data to the response.
5. Exception handling: The handlePageException() method can be used to handle page-specific JSP exceptions.
6. EL support: PageContext is used by the EL engine to resolve expressions.