JSP隱含對象和EL表達式隱含對象

原文地址  http://blog.sina.com.cn/s/blog_5e9531a20100cc5k.html

JSP的隱含對象:

JSP隱含對象	Type	Scope	經常使用的方法
request	Subclass of javax.servlet.ServletRequest	Request	getAttribute, getParameter, getParameterNames, getParameterValues, setAttribute
response	Subclass of javax.servlet.ServletResponse	Page	Not typically used by JSP page authors
pageContext	javax.servlet.jsp.PageContext	Page	findAttribute, getAttribute, getAttributesScope, getAttributeNamesInScope, setAttribute
session	javax.servlet.http.HttpSession	Session	getAttribute, getId, setAttribute
application	javax.servlet.ServletContext	Application	getAttribute, getMimeType, getRealPath, setAttribute
out	javax.servlet.jsp.JspWriter	Page	clear, clearBuffer, flush, getBufferSize, getRemaining
config	javax.servlet.ServletConfig	Page	getInitParameter, getInitParameterNames
page	java.lang.Object	Page	Not typically used by JSP page authors
exception	java.lang.Throwable	Page	getMessage, getLocalizedMessage, printStackTrace, toString

 

 

 

 

EL表達式的隱含對象

EL表達式的隱含對象	Type	具體說明
pageContext	javax.servlet.jsp.PageContext	The context for the JSP page. Provides access to various objects, including servletContext, session, request, and response.
pageScope	java.util.Map	Maps page-scoped variable names to their values.
requestScope	java.util.Map	Maps request-scoped variable names to their values.
sessionScope	java.util.Map	Maps session-scoped variable names to their values.
applicationScope	java.util.Map	Maps application-scoped variable names to their values.
param	java.util.Map	Maps a request parameter to a single String parameter value (obtained by calling ServletReqwuest.getParameter (String name)).
paramValues	java.util.Map	Maps a request parameter name to an array of String values for that parameter name (obtained by calling ServletRequest.getParameterValues (String name)).
header	java.util.Map	Maps a request header name to a single String header value (obtained by calling ServletRequest.getHeader(String name)).
headerValues	java.util.Map	Maps a request header name to an array of String values for that header (obtained by calling ServletRequest.getHeaders (String)).
coookie	java.util.Map	Maps a cookie name to a single Cookie object. Cookies are retrieved according to the semantics of HttpServletRequest.getCookies(). If the same name is shared by multiple cookies, an implementation must use the first one encountered in the array of Cookie objects returned by the getCookies() method. However, the ordering of cookies is currently unsspecified in the Servlet specification.
initParam	java.util.Map	Maps a context initialization parameter name to a String parameter value (obtained by calling ServletContext.getInitparameter (String name)).

原文地址  http://blog.sina.com.cn/s/blog_5e9531a20100cc5k.html