What are the built-in objects of jsp in java

1. The Request object of the HttpServletRequet class: represents the request object and is mainly used to accept the client's data transmission from the server through the HTTP protocol connection.

2. The Response object of the HttpSevletResponse class: represents the response object and is mainly used to send data to the client.

3. The out object of the JspWriter class: mainly used to output data to the client. The base class of out is jspWriter

4. The session object of the HttpSession class: mainly used to save each Monthly information is associated with the session of the request; maintenance of session state is a problem that web application developers must face.

5. The application object of the ServletContext class: mainly used to save user information and the running environment of code snippets; it is a shared built-in object, that is, multiple users in a container share an application, so it is saved information is shared by all users.

6. The PageContext object of the PageContext class: manages web page attributes, wraps the context of the page for the jsp page, and manages access to named objects belonging to the special visible part of the jsp. Its creation and initialization are performed by the container to complete.

7. Config object of ServletConfig class: code snippet configuration object, identifying the Servlet configuration.

8. The Page object of the Object class handles jsp pages. It is an instance of the object class and refers to an instance of the jsp implementation class.

9. Exception object: occurs when processing jsp files. Errors and exceptions are only used in error pages, provided that isErrorPage=true is included in the page directive.

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