I suggest you look at ServletRequest.setAttribute()
In programming Servlets - you can work with parameters which are the fun
little things which come off the query string or via the POST body.
These items should be thought readonly - and only set/sent from the
HttpClient (aka - the web browser).
As a programmer - you wish to pass extra information along to other
Servlets, Filters, etc - the recommended way is to attach that baggage
to the ServletRequest via setAttribute.
In a typical MVC setting - a servlet will use the request parameters to
construction objects which are then placed into the ServletRequest via
setAttribute. Then the servlet forwards to a view and the view pulls all
needed data from the ServletRequest via getAttribute. Using request
parameters in the view is typically an invitation to an XSS attack.
-Tim
Jonathan Mast wrote:
| This is really the only way to do it. The other option is to create a
| new request object and stuff your own parameters into it (or, better
| yet, wrap the original request and add your parameters only to the
wrapper).
How would I do this? This is basically what Jakarta Commons HTTPClient
package (org.apache.commons.httpclient.*) offers, correct?
I thought such manipulation would be achievable without additional packages.
| Why do you believe that adding parameters to the URL is not scalable?
Well, its not scalegent, to coin a term;
String munging is expensive (scalability), and
StringBuffer sb = new StringBuffer();
sb.append("page.jsp?").append("foo=").append(bar).append("&color=").append(myColor).etc()
is rough to look at (elegent).
Why not just:
HashMap myParams = new HashMap();
myParams.put("foo", bar);
...
pageContext.forward("page.jsp", myParams) ?
much more efficient and elegent, imho.
I understand that it all eventually boils down to a bunch of String munging,
but the above hypothetical method could take of it that for us and would
really make my life easier ;-)
thanks
On Wed, Aug 6, 2008 at 1:17 PM, Christopher Schultz <
[EMAIL PROTECTED]> wrote:
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Jonathan,
Jonathan Mast wrote:
| I can't figure out how to use the pageContext.forward() method like it's
| equivalent script element:
Do you mean that you want to add parameters to a forwarded URL without
using JSP?
| How do I pass the name-value pair "foo":"bar" using
pageContext.forward()? I
| thought there would be a method like forward(String path, Map params) but
| there isn't.
Right: you just forward to another URL.
| Nor is there a setParameter(name, value) method available on
ServletRequest
| or ServletResponse (both of which are passed onto the page pointed to in
| pageContext.forward().
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