> Hi to all,
>
> I have a html file that there is an applet on it. I want when a user
> click on a button on applet , then send object to Serlvet and after
> that the Servlet write a html toward client.
>
> I wrote a sample program that sends object form applet to servlet and
> vise versa but when I want to send object ot servlet and get html ,
it
> diesn't work. How can I solve my problem.
>
>
> Any suggestion.
>
> Thanks a lot
>
> Mina
>
Simply put, you cannot send serialized Java objects to a servlet via an HTTP
connection as
a parameter.
Because of the way the HTTP protocol expects parameter names and values to
be encoded
(Check out the docs for URLEncoder to see what I mean) and the strict
conformance to this
format imposed on you it is only practical to send parameter values which
are either
a) ASCII human readable or
b) Base64Encoded so that they conform to the imposed format for parameters.
(Note, there are other encoding schemes that will do this as well, notably
URLEncode.encode(String))
As it is difficult to get at the actual bytes of a serialized object (done
by writing the object to a file and
opening it as a FileInputStream to read bytes from) in an applet so you can
encode them
it is not a practical thing to attempt.
Obviously, for some objects, it is possible to get at the internal structure
for the above purpose, again
though, really rather impractical.
I see this problem being asked about almost daily and it nearly always
involves sending String's
as a serialized object which is totally unnecessary.
Your content type should be the usual for a POST|GET method request.
(application/x-www-form-urlencoded)
you should use a DataOutputStream to send your URLEncode'd parameter string
to the server
via writeBytes(String params)
flush and close the connection then open and read the response.
Simple when you know how. It pays to be a lot better informed about what the
HTTP protocol
imposes on you and how that relates to using Java to connect to a server.
I don't have the relevant links for the RFC's to hand however www.w3c.org is
a good place to start.
Andy Bailey
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