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jsp, db AND beans


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super_pj_girl Posted: Sun Feb 10, 2002 8:44 pm


Joined: 09 Feb 2002

Posts: 21
jsp, db AND beans
how does the bean know which variables r
his?<br><br>if i do &lt;jsp:setProperty name= "teacher" property
= "*"/&gt; <br>how does he know which r
his?<br><br>cos i have a method in bean which is setTeacher(int
code, string name, etc...)<br><br>how do i pass it to
the bean?? i dun get it, the book i have is so
totally vague!<br><br>plz help
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mcconnell_stephen Posted: Mon Feb 11, 2002 11:30 pm


Joined: 01 Feb 2002

Posts: 73
jsp, db AND beans
The JSP set property tag will perform the set on
sets that have single parameters.<br><br>The JSP
compiler uses something called "introspection" to look at
the Java bean and find all the set&lt;variable
name&gt; methods. It then looks at the "request" object to
see if a variable with the same name has been set in
the request object.<br><br>If you have a parameter in
your previous page or you set it in the servlet that
is named like this:<br><br>setParameter("teacher",
"Mrs. Grouch"); <br><br>(I actually had a teacher named
that... she was really nice).<br><br>You would have a
method in the Bean like
this.<br><br>bean.setTeacher(String param);<br><br>Notice that the first
character in
the parameter is not capitalized and the first
character of Teacher in the set method is
capitalized.<br><br>You can actually see the code generated by the tag if
you look up the java generated by the JSP
compile....<br><br>Also, check out the java.reflection.* API`s... They
allow you to do alot of "dynamic" programming...
<br><br>Hope this helps.<br><br>Stephen
McConnell<br><a href=http://www.crosslogic.com
target=new>http://www.crosslogic.com</a>
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