1.. The Request object of the HttpServletRequet class: represents the request object, 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, 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.PageContext object of the PageContext class: manages web page attributes, wraps the context of the page for the jsp page, manages access to named objects belonging to the special visible part of the jsp, and is created and initialized by the container to complete.
7. The Config object of the ServletConfig class: the code snippet configuration object identifies the Servlet configuration.
8. The Page object of the Object class, which processes jsp pages, is an instance of the object class, referring to the instance of the jsp implementation class
9.Exception object: occurs when processing jsp files are executed Errors and exceptions can only be used in error pages, provided that isErrorPage=true is included in the page command
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