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Posted on 2010-07-24 12:40 xcp 閱讀(2354) 評論(0) 編輯 收藏 所屬分類: JAVA
JSP中的內置對象一共有九個, 由于有的不太常用, 所以總是記不住, 從Sun公司的網站上找到的PDF文檔, 把這一部分放在這里, 以備隨時查用:
Implicit Objects for Scriptlets
(JSP Scriplets中的隱含對象) |
Type
(對應類型) |
Scope
(范圍) |
Some Useful Methods (see class or interface for others)
(常用的方法) |
| 1 |
request |
Subclass of javax.servlet.ServletRequest |
Request |
getAttribute, getParameter, getParameterNames, getParameterValues, setAttribute |
| 2 |
response |
Subclass of javax.servlet.ServletResponse |
Page |
Not typically used by JSP page authors |
| 3 |
pageContext |
javax.servlet.jsp.PageContext |
Page |
findAttribute, getAttribute, getAttributesScope, getAttributeNamesInScope, setAttribute |
| 4 |
session |
javax.servlet.http.HttpSession |
Session |
getAttribute, getId, setAttribute |
| 5 |
application |
javax.servlet.ServletContext |
Application |
getAttribute, getMimeType, getRealPath, setAttribute |
| 6 |
out |
javax.servlet.jsp.JspWriter |
Page |
clear, clearBuffer, flush, getBufferSize, getRemaining |
| 7 |
config |
javax.servlet.ServletConfig |
Page |
getInitParameter, getInitParameterNames |
| 8 |
page |
java.lang.Object |
Page |
Not typically used by JSP page authors |
| 9 |
exception |
java.lang.Throwable |
Page |
getMessage, getLocalizedMessage, printStackTrace, toString |
JSP十一個用于EL表達式的隱含(內置)對象:
Implicit Objects for EL
Expressions
用于EL表達式的隱含對象 |
Type
類型 |
Description
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)). |
名稱: ?4C.ESL | .↗Evon
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