Javaweb in JSP nine large built-in objects and four scopes

Nine large built-in objects are

1. Page
2. Request
3. Response
4. Session
5. exception
6. Config
7. Application
8. Out
9. PageContext　　　　　

No	built-in objects	type
1	Page	Java.lang.Object
2	Request	Javax.servlet.http.HttpServletRequest
3	Response	Javax.servlet.http.HttpServletResponse
4	Session	Javax.servlet.http.HttpSession
5	exception	Java.lang.Throwable
6	Config	Javax.servlet.ServletConfig
7	Application	Javax.servlet.ServletContext
8	Out	Javax.servlet.jsp.JspWriter
9	PageContext	Javax.servlet.jsp.PageContext

ServletConfig in the servlet configuration file, Web. XML, you can configure some initialization parameters for the servlet using one or more <init-param> tags

You can get the initialization parameters of the servlet

ServletContext : When the Web container starts, it creates a corresponding ServletContext object for each Web application that represents the current Web application

You can get the initialization parameters of the servlet application

Javaweb in JSP nine large built-in objects and four scopes