zno2

jsp 是什么 ,jsp 隐式对象

google 搜索 java server page

http://www.oracle.com/technetwork/java/javaee/jsp/index.html

http://docs.oracle.com/javaee/5/tutorial/doc/bnagx.html

5.  JavaServer Pages Technology

6.  JavaServer Pages Documents

7.  JavaServer Pages Standard Tag Library

8.  Custom Tags in JSP Pages

9.  Scripting in JSP Pages

 

什么是pageContext

http://docs.oracle.com/javaee/5/tutorial/doc/bnahq.html#bnahv

Implicit Objects

The JSP expression language defines a set of implicit objects:

  • pageContext: The context for the JSP page. Provides access to various objects including:

  • In addition, several implicit objects are available that allow easy access to the following objects:

    • param: Maps a request parameter name to a single value

    • paramValues: Maps a request parameter name to an array of values

    • header: Maps a request header name to a single value

    • headerValues: Maps a request header name to an array of values

    • cookie: Maps a cookie name to a single cookie

    • initParam: Maps a context initialization parameter name to a single value

  • Finally, there are objects that allow access to the various scoped variables described in Using Scope Objects.

    • pageScope: Maps page-scoped variable names to their values

    • requestScope: Maps request-scoped variable names to their values

    • sessionScope: Maps session-scoped variable names to their values

    • applicationScope: Maps application-scoped variable names to their values

 

Scope Object

Class

Accessible From

Web context

javax.servlet.ServletContext

Web components within a web context. See Accessing the Web Context.

Session

javax.servlet.http.HttpSession

Web components handling a request that belongs to the session. See Maintaining Client State.

Request

Subtype ofjavax.servlet.ServletRequest

Web components handling the request.

Page

javax.servlet.jsp.JspContext

The JSP page that creates the object. See Using Implicit Objects.

posted on 2016-08-05 18:26  zno2  阅读(176)  评论(0编辑  收藏  举报

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