I am writing to this list after inquiries elsewhere have turned up no
adequate responses. I hope it is the correct forum for the question, since
I am having trouble on Tomcat whereas I didn't on Resin and need to know how
the Tomcat container handles the HttpServletResponseWrapper.
I have a servlet which needs to write a JSP page's resultant HTML to a file
instead of sending it back to the browser.
I do this by wrapping the response with HttpServletResponseWrapper, calling
RequestDispatcher and forward on the wrapped response, which runs the JSP
and writes the resultant HTML to a file, then forward control to a
thankyou.html page.
This works with Resin. However, in Tomcat, when I wrap the response, I
"commit" the original response object and can not forward to a thank you
page. I catch a "java.lang.IllegalStateException: Cannot forward after
response has been committed". In my debug tests, the response is committed
during the RequestDispatchers forward method.
I need to avoid this. The templates (1 and 2) are all JavaServer Pages
whose output (HTML) is intercepted and written to file by the
MyServletResponse wrapper. How do I do this without "committing" the
response object. I could find no way of duplicating or cloning the object
before passing it to MyServletResponse's constructor. Nor could I close the
ServletOutputStreams. Any ideas? This worked wonderfully on Resin, but not
Tomcat 4.0.1. I prefer to use Tomcat.
If this cannot work, I need to know so I can move on. If there is a better
way to handle it, I'm open to that as well. Additionally it is ENTIRELY
reasonable to assume that I have implemented the wrapper incorrectly.
Thank you,
Jay Wright
THE SERVLET CODE:
MyServletResponse wrapper1 = new MyServletResponse (response,
"1_content.txt");
MyServletResponse wrapper2 = new MyServletResponse (response,
"2_content.txt");
rd = request.getRequestDispatcher(template1);
rd.include(request, wrapper1);
wrapper1.close();
rd = request.getRequestDispatcher(template2);
rd.include(request, wrapper2 );
wrapper2 .close();
request.getRequestDispatcher(getScreenFlowManager().getTemplate(locale)).for
ward(request, response);
MY WRAPPER CLASS:
public class MyServletResponse extends HttpServletResponseWrapper {
private PrintWriter printWriter;
private ServletOutputStream servletOutputStream;
/**
* Constructor
*/
public MyServletResponse (HttpServletResponse response, String filename)
throws java.io.IOException {
super(response);
servletOutputStream = response.getOutputStream();
File file = new File(filename);
String fileCreated = file.toString();
printWriter = new PrintWriter(new BufferedWriter(new
FileWriter(fileCreated)));
}
public ServletOutputStream getOutputStream() throws java.io.IOException
{
return servletOutputStream;
}
public void setOutputStream(ServletOutputStream sos) throws
java.io.IOException {
servletOutputStream = sos;
}
public PrintWriter getWriter() throws java.io.IOException {
return printWriter;
}
public void close() {
this.printWriter.close();
}
}
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