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From "Jeff Neuenschwander" <j...@collegeguy.com>
Subject Re: Passing parameters to a bean from a JSP
Date Mon, 03 Apr 2000 22:53:47 GMT
The first time I sent data to a bean using data from request, I got null
values because I didn't give the request.getParameter method the right
paramenter name, but you've probably already checked that...


----- Original Message -----
From: "Jerry Thomas" <jerry_thomas@hotmail.com>
To: <tomcat-user@jakarta.apache.org>
Sent: Monday, April 03, 2000 5:17 PM
Subject: RE: Passing parameters to a bean from a JSP


>
> The request.getParameterNames() comes back with no values. Is there
> something I need to do to initialize the request object?
>
> >Try
> >
> >     String parString = request.getParameter("nameOfFormItem"); //Use
this
> >to
> >get the values of individual form items.
> >
> >
> ><% //Use this to list all the form items and their values.
> >     Enumeration enum = request.getParameterNames(); //Put all parameters
> >into an enumeration object
> >     while (enum.hasMoreElements()) //Iterate throught the enumeration.
> >     {
> >       String paramName = (String) enum.nextElement(); //Get the name of
> >the
> >next parameter
> >       out.println(paramName + ":" + request.getParameter(paramName) +
> >"<br>"); //Get the value of the parameter and print it to the screen
> >     };
> >%>
> >
> >That's what we use with Tomcat 3.0 and 3.1 and they work great.
> >
> >Cheers
> >Scott Petersen
> >Programmer/Analyst
> >Pangaea Systems
> >speterse@pangaea.ca
> >250-360-0111
> >
> > >
> > > The request.getParameterNames() and request.ParameterValues()
> > > are returning
> > > null. I am pulling values from the FORM using JavaScript so I
> > > know that the
> > > fields are there and that they have values. How do I
> > > initialize the request
> > > object so that I can pull FORM values from it?
> > >
> > >
> > > >
> > > >Your FORM parameters and INPUT fileds are sent to your JSP
> > > in the same
> > > >way that they are to a Servlet (after all your JSP are compiled into
> > > >Servlets by the server). There's a HttpServletRequest object named
> > > >'request' accesible in your JSP code through which you can
> > > extract the
> > > >values of every parameter and INPUT field of the FORM
> > > submitted by the
> > > >user. Check the Java API for the HttpServletRequest class.
> > > >
> > > >Jerry Thomas wrote:
> > > > >
> > > > > How do I extract data from a FORM and assign the data to
> > > a Java variable
> > > > > that I have declared on my JSP?
> > > > >
> > > > > > >
> > > > > > > I have data contained in a JavaScript variable that
> > > would like to
> > > >pass
> > > > > >to a
> > > > > > > method on my Java bean. I have been successful
> > > retrieving data from
> > > >my
> > > > > >bean
> > > > > > > into my JSP but I cannot figure out how to format the
> > > script so that
> > > >I
> > > > > >can
> > > > > > > send data back to my bean through its methods.
> > > > >
> > > > > >You can pass parameters as FORM hidden fields that can
> > > be extracted
> > > >from
> > > > > >a
> > > > > >servlet and finally passed through to the Bean. This is
> > > independent
> > > >from
> > > > > >the cookie policy set at the browser.
> > > > > >
> > > > > >Juan Alvarez Ferrando
> > > > > >
>
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