Hi DENIZ :-)
Because today is a holiday in Canada :-) , so I sleep for long time :-) :-) ,
so when I came to office, I find several your emails :-) and I find with
Abhay's email( using "_self"), you have already fixed your problem :-)
0
but I think if we use this way , in fact now we don't use
"sendRedirect" any more, because now we "invoke" servlet2 directly
in our applet. But from your last email, with this way, you also can:
"invoke servlet2" + keep the same "session"
So I think it is a good way :-) but I didn't ever try it :-)
1
After I receive your this mail, I did a testing:
a in my applet -- [send+read]
b in servlet1 -- doPost
[a] [read+sendRedirect_to_servlet2]
[b] [read+send_directly_from_servlet1+sendRedirect_to_servlet2]
[c] [read+sendRedirect_to_servlet2+send_directly_from_servlet1]
[d] -- like your code -- [b] + [put "flush" BEHIND "sendRedirect"]
I think if we want to "sendRedirect" to servlet2 in "doPost" of servlet1,
it means now we want to let servlet2 to response to our applet, so
now we [don't need+should not :-)] let servlet1 to response anything
to our servlet! -- but I find your code is SIMILAR with [b] -- BUT not
very similar :-) , because you put:
[response.sendRedirect("http://deniz:8080/servlet/Servlet_2");]
BETWEEN
[response.getOutputStream();]
AND
[out.flush();]
So did you want to let BOTH servlet1 and servlet2 ALL response
to our applet ? I don't know if it is possible :-) but I also did a #[d]
testing
-- [b] + [put "flush" BEHIND "sendRedirect"] , but now the result is same
with [a] -- my applet only get the response from servlet2, and no Exception.
The following is the result of my testing:
[a] -- it can "sendRedirect" to servlet2 //haha :-)
[b] -- now our applet only get the "response" from servlet1, and servlet2
didn't be "invoked". -- because servlet1 has already responsed
to our applet, so servlet1 will not "sendRedirect" to servlet2
[c] -- it can "sendRedirect" to servlet2 , but I get a Exception:
IllegalStateException ... because now the response
has already been "sendRedirect" to servlet2, so now
servlet1 can not response again :-)
[d] -- same with [a] -- it can "sendRedirect" to servlet2, and
I didn't get Exception.
2
My suggesting:
a if you don't want to let BOTH servlet1 and servlet2 ALL response
to our applet, I suggest you don't let servlet1 response anything to
applet -- servlet1 just read some data from applet, and decide which
servlet shold be "sendRedirect" , that is enough .
b But if you want to let BOTH servlet1 and servlet2 ALL response to
our applet, I don't know how to do it :-)
3
the following is my testing code:
a in doPost in servlet1:
//read...
is=new ObjectInputStream( request.getInputStream() );
s_tmp=(String)is.readObject();
//response directly from servlet1...
response.setContentType("application/octet-stream");
os=new ObjectOutputStream( response.getOutputStream() );
os.writeObject("in 0, in POST="+s_tmp);
//for DENIZ's code -- #[d] case
os.flush();
//sendRedirect to servlet2...
response.sendRedirect(response.encodeUrl("/servlet/servlet_ht2"));
is.close(); is=null;
os.close(); os=null;
and my testing is adjust the "order" of the following:
"response directly from servlet1..."
"sendRedirect to servlet2..."
"for DENIZ's code -- #[d] case"
b in my applet -- it is similar with your code for your button
//send to servlet1...
os=new ObjectOutputStream( con.getOutputStream() );
os.writeObject( "from applet" );
os.flush();
is=new ObjectInputStream(con.getInputStream());
s_tmp=(String)is.readObject();
System.out.println("return from servlet1 or servlet2 ="+s_tmp);
s_tmp=null;
is.close(); is=null;
os.close(); os=null;
Hope my testing is right :-) now I find I am confused -- my head
is a little bigger_and_heavier than before :-) :-) :-) :-) :-) -- or
it is because I sleep too long this morning? :-)
Welcome to any instruction! So I can set the size of my head
to "default" ! :-) :-) :-) :-) :-)
Bo
Oct.09, 2000
DENIZ DEMIR wrote:
> I have tried to invoke sendRedirect() in doPost method when the applet's
> button is pushed, but it did not work. Here is the code:
> Please help me...
>
> -------this is applet acctionPerformed code------------
>
> void jButton1_actionPerformed(ActionEvent e) {
> System.out.println("Sending data...\n");
> try {
> URL url = new URL("http://localhost:8080/servlet/Servlet_1");
> URLConnection con = url.openConnection();
>
> con.setUseCaches(false);
> con.setDoOutput(true);
>
> ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
> DataOutputStream out = new DataOutputStream(byteOut);
> out.writeUTF(txtField.getText());
> out.flush();
> byte[] buf = byteOut.toByteArray();
> con.setRequestProperty("Content-type", "application/octet-stream");
> con.setRequestProperty("Content-length", "" + buf.length );
>
> DataOutputStream dataOut = new DataOutputStream(con.getOutputStream());
> dataOut.write(buf);
> dataOut.flush();
> dataOut.close();
> }catch(Exception ex) { ex.printStackTrace(); }
> System.out.println("Data was sent...");
> }
>
> ------and this is the servlet doPost code----------
>
> public void doPost(HttpServletRequest request, HttpServletResponse
> response) throws ServletException, IOException {
> response.setContentType("text/html");
> PrintWriter out = new PrintWriter (response.getOutputStream());
> out.println("<html>");
> out.println("<head><title>Servlet1</title></head>");
> out.println("<body>");
> out.println("The servlet has received a POST. This is the reply.");
> out.println("</body></html>");
>
> DataInputStream in = new DataInputStream(request.getInputStream());
> String s = in.readUTF();
> in.close();
> out.println("<p>s: " + s);
> response.sendRedirect("http://deniz:8080/servlet/Servlet_2");
> out.flush();
> out.close();
> }
>
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