Hi,
I have worked on ur problem and have found a solution. Pl see the commented
lines // for explanation.
1. portion of the Applet code :
This I called in response to a button click in the Applet. But u may be
calling this code on some other event.
try
{
//testServlet is the servlet I am invoking from the applet
//IP address 192.50.200.55 is where all my test servers are running, ur
//machine address will be different
URL myUrl = new URL ("http://192.50.200.55:8080/servlet/testServlet");
URLConnection con = myUrl.openConnection();
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
con.setDefaultUseCaches(false);
con.setRequestProperty("Content-type", "application/octet-stream");
ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream());
SBSRequest myObject = new SBSRequest(100);
//passing a serialized object to the servlet
out.writeObject(myObject);
out.close();
//the servlet recieves the serialized object , and writes its state
//along with HTML to a file fil.html. Applet is showing this file
//using showDocument function. The location http://192.50.200.55/ddir
//is mapped to the Java Web Server root directory where .html file is
//getting created by default. u can create .html file in some other
directory //also and
map it accordingly. The location http://192.50.200.55/ddir
//is identified by MS PWS in my case. u can also use JWS for this
purpose
//also.
getAppletContext().showDocument(new
URL("http://192.50.200.55/ddir/fil.html"));
}
catch(MalformedURLException ex)
{
ex.printStackTrace();
}
catch(IOException ex)
{
ex.printStackTrace();
}
2. portion of the Servlet code :
public void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException
{
try
{
ObjectInputStream ins = new ObjectInputStream
(request.getInputStream());
ObjectOutputStream outs = new
ObjectOutputStream(response.getOutputStream());
SBSRequest sbsRequest = (SBSRequest)ins.readObject();
int data = sbsRequest.getData();
ins.close();
//servlet recieves the serialized object and creates a .html file for
//applet to show on the browser
FileWriter out = new FileWriter("fil.html");
out.write("<html>");
out.write("<head><title>testServlet</title></head>");
out.write("<body>");
out.write("<h2>"+data+"</h2>");
out.write("</body></html>");
out.close();
}
catch(ClassNotFoundException ex)
{
ex.printStackTrace();
}
} //end of doPost
3. Code for SBSRequest class(u may be using a different class definition) :
import java.io.*;
public class SBSRequest implements Serializable
{
int i;
SBSRequest(int ii)
{
i = ii;
}
public int getData()
{
return i;
}
}
Since ur doing POST from an Applet(using URLConnection), u cannot recieve
HTML sent from the servlet by default on the browser { The HTTP response
from the server is inside the applet in a Input stream and hence not
available to the browser }. Therefore I have used an intermediate .html
file to show HTML on the browser.
Hope my soln solves ur problem.
-mukul
At 07:19 PM 8/11/99 +0100, you wrote:
> Hi all,
>
>I have a doubt and I think the answer is very simple..
>I want to call a servlet from an applet with the method post in order to
>send an object to the servlet, and I want the servlet responds whith an HTML
>page. This page will show in the browser where the applet is..
>
>the source maybe like this :
>
>In the applet :
>
> ....
> URL myUrl = new URL ("http://myserver:8080/servlet/myservlet");
> URLConnection con = myUrl.openConnection ();
>
> con.setDoInput (true);
> con.setDoOutput (true);
> con.setUseCaches (false);
> con.setDefaultUseCaches (false);
> con.setRequestProperty ("Content-type", "application/octet-stream");
>
> ObjectOutputStream out = new ObjectOutputStream (con.getOutputStream
>());
> out.writeObject (myObject);
> out.close ();
> ....
>
>In the servlet :
>
> public void doPost (HttpServletRequest request, HttpServletResponse
>response) {
>
> ObjectInputStream in = new ObjectInputStream (request.getInputStream
>());
> ObjectOutputStream out = new ObjectOutputStream
>(response.getOutputStream ());
>
> SBSRequest sbsRequest = (SBSRequest)in.readObject ();
> in.close ();
>
> response.setContentType ("text/html");
> PrintWriter out = response.getWriter ();
> out.println ("<html>");
> out. ....
> out.println ("</html>");
> out.close ();
>
> }
>
>I tried this but the browser does not show the html page. Someone has done
>this before ?
>Thanks in advance,
>
>Juan Jose Martin
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