I forgot to point out an important thing:
I need to connect directly from Servlet_A to Servlet_B using
HttpURLConnection object and openConnection() method because in Servlet_A I
must read and modify
the HTML code returned from Servlet_B before to show it to the user
( in particular I must example replace some http links present in the html
page).
Note that I haven't indicated how I modify the HTML page in the piece code
below but it isn' important.
Thanks.
Luca
-----Messaggio originale-----
Da: A mailing list for discussion about Sun Microsystem's Java Servlet
API Technology. [mailto:[EMAIL PROTECTED]]Per conto di Luca
Ventura
Inviato: marted� 16 luglio 2002 10.22
A: [EMAIL PROTECTED]
Oggetto: Exchange cookie between servlets
Hello everybody!
I have the following problem....
I have two servlets called "Servlet_A" and " Servlet_B". "Servlet_B" is
running on an external Web Site and requests authentication to access to it,
while "Servlet A" is mine and is running on my Web Site.
When a user connects to Servlet_B from the Web Browser (using Servlet_B's
URL, for example: http://www.domain.com/Servlet_B ) he must insert his login
and password in a form "F" for identification.
What I would like to do is to make to communicate Servlet_A and Servlet_B
each other, implementing
some "automatic identification procedure": that is to say when a user
connects to my Web Site (and so to Servlet_A too) I use the login and the
password he typed before to identify himself to connect to Servlet_B.
Let's suppose that the login and the password to access to Servlet_A and
Servlet_B are the same.
I implemented the "automatic identification procedure" sending from
Servlet_A to Servlet_B the same parameters present in form "F" (using POST
method). At this point I have the following problem: Servlet_B requires
not only the identification parameters present in the form but also that the
user has the "Cookie support" enabled in his Web Browser and that he
accepts a cookie after identification.
In fact for every user Servlet_B create a session object where to store
useful information about him.
So if I connects to Servlet_B not from a Web Browser but from my Servlet_A I
don't know how
to simulate in Servlet_A the "cookie support" of the browser storing or
reading the cookie that it is sent from ServletB to Servlet A. So Servlet_B
believes that Servlet_A hasn't "cookie support" enabled and the
identification procedure fails....in fact in this case Servlet_B can't
create a session for Servlet_A!!!
I want to point out that to connect to Servlet_B from Servlet_A I used the
following piece of code
(in ServletA):
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
{
.
String UrlServlet_B=...;
URL url = new URL(UrlServlet_B);
HttpURLConnection Con = (HttpURLConnection)url.openConnection();
Con.setRequestMethod("POST");
//I encode the form parameters for identification: Login and Password.
"LoginValue" and "PasswordValue"
are the values of the Login and Password that the user already used to
access to Servlet_A.
String
PostData="Login="+URLEncoder.encode(LoginValue)+"&Password="+URLEncoder.enco
de(PasswordValue);
Con.setDoInput(true);
Con.setDoOutput(true);
Con.setUseCaches(false);
Con.setRequestProperty("Content-Length",""+PostData.length());
Con.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
//Now I sent the parameters in POST to Servlet_B
DataOutputStream DataStream=new DataOutputStream(Con.getOutputStream());
DataStream.writeBytes(PostData);
DataStream.flush();
DataStream.close();
//Now I read the HTML page returned by Servlet_B that contains the result of
identification
InputStream ins = Con.getInputStream();
BufferedReader In = new BufferedReader(new InputStreamReader(ins));
boolean Exit=false;
String Page="";
while(!Exit )
{
String line =null;
try
{
line = In.readLine();
if (line==null) Esci=true;
} catch (Exception Ex){
Exit=true;}
if (line!=null) Pagina+=line;
}
}
//Now I show the HTML page "Page" in the Web Browser of the user.
PrintWriter Out=new PrintWriter(response.getOutputStream());
res.setContentType("text/html");
Out.println(risultato);
Out.close();
Can someone help me? How can I implement the identification procedure
passing from my Servlet_A and not directly from the Web Browser of the user?
Is it possible to set and read cookies using an "HttpURLConnection" object
and not "HTTPServletRequest" and HTTPServletResponse" objects (in fact
when I open a direct connection these types of objects aren't available)?
Thanks a lot in advance!
Luca
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Resources: http://java.sun.com/products/servlet/external-resources.html
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