Talking about nine implicit objects in jsp, talking about jsp implicit objects

Talking about nine implicit objects in jsp, talking about jsp implicit objects

There are a total of nine implicit objects in JSP. I can use these nine objects directly in JSP.

Since the service method has declared and assigned values to the nine implicit objects, it can be directly used in JSP.

-PageContext

Type: PageContext

Representative: Context of the current page

Purpose: You can obtain other hidden objects on the page. It is also a domain object.

-Request

Type: HttpServletRequest

Representative: Request

Purpose: Obtain the request information sent by the user. It is also a domain object.

-Session

Type: HttpSession

Representative: current session

Role: it can be used as a domain object to share data.

-Application

Type: ServletContext

Representative: represents the entire WEB application

Role: it is the largest domain object in JavaWeb.

-Response

Type: HttpServletResponse

Representative: Response

Purpose: Send Response Information to the browser

-Out

Type: JspWriter

Representative: output stream

Purpose: Output content to the page

-Config

Type: ServletConfig

Representative: the configuration information of the current JSP

Purpose: You can obtain the initialization parameters in the Servlet tag.

-Page

Type: Object has the following code in the service method: Object page = this;

Representative: The current JSP object

-Exception

Type: Throwable

Representative: exception information

Purpose: Get an exception on the page

The Nine hidden objects in the above discussion jsp are all the content shared by the editor. I hope you can give us a reference and support the help house.