First, the JSP's 9 large built-in objects (implicit), already new good object
(1) Examples of out:jspwriter, for example:
Out.print ("")
Out.println ("")
(2) Page: The current JSP page itself, similar to the use of this in Java, with less
(3) Pagecontext:page context object.
Javax.servlet.jsp.pageContext interface object, for example:
Pagecontext.setattribute ("x", 100)
Pagecontext.getattribute ("x")
(4) Request:Javax.servlet.http.HttpServletRequest interface object, for example:
Request.getparameter ("")
Request.setattribute ("W", "200")
Request.getattribute ("W")
(5) Response:Javax.servlet.http.HttpServletRequest interface object, for example:
Response.sendredirect ("")
(6) Session:Javax.servlet.http.HttpSession interface object, for example:
Session.setattribute ("Y", "300")
Session.getattribute ("Y")
(7) Aplication:servletcontext examples, for example:
Aplication.setattribute ("Z", "400")
Aplication.getattribute ("Z")
(8) Config:servletconfig Example
(9) Exception:servletexception Example
Second, the JSP four big scope:
The concrete usage still is in the actual application experience and the study ha. If there are inappropriate places, we look forward to the point and exchange of learning with you.
JSP Learning Note (ii): JSP four big scopes
