Jashua Ni wrote:
> Hi, all:
>
> I could not find the definition for the following:
> inside a servlet service() function, request.setAttribute("key",
> Object), when this servlet call a jsp, inside jsp, <%Object
> o1=(Object)reqest.getAttribute("key"), then every function and variable from
> o1 is available to be used inside jsp?
>
> Is this a jsp specification? where can I find the definition for this?
> Thanks in advance.
>
> Jashua Ni
>
Because a JSP page is compiled into a servlet, your scriptlets can do everything a
servlet can. I suggest you take a look at the Servlet API Specification (version
2.1 is current, version 2.2 will be soon -- it is also a lot more thorough in its
coverage of these issues), available at:
http://java.sun.com/products/servlet
The particular call you are talking about is a method of ServletRequest (which
HttpServletRequest extends). It is quite useful when you want to pass objects to
a JSP page (or servlet) that you are either including (<jsp:include>) or
forwarding to (<jsp:forward>). If you forward to a servlet, it can use
request.getAttribute() to access this object. If you forward to a JSP page, it
can use <jsp:useBean id="key" scope="request" ...> to access the object.
The Java Language Tutorial also has a nice introduction to Servlets that helps you
understand the basic concepts:
http://java.sun.com/docs/books/tutorial
Craig McClanahan
>
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