I have a servlet which uses a HttpServletResponseWrapper to wrap a response,
write data to a file, then eventually forwards to a jsp to display the
typical "thank you" page.
The problem is that when I wrap the response, I "commit" the response object
and can not forward to a thank you page. I catch a
"java.lang.IllegalStateException: Cannot forward after response has been
committed".
I need to avoid this. The templates (1 thru 3) 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 need to use Tomcat.
THE SERVLET CODE:
MyServletResponse wrapper1 = new MyServletResponse (response,
"1_content.txt");
MyServletResponse wrapper2 = new MyServletResponse (response,
"2_content.txt");
MyServletResponse wrapper3 = new MyServletResponse (response,
"3_content.txt");
// HTML
rd = request.getRequestDispatcher(template1);
rd.include(request, wrapper1);
wrapper1.close();
// AOL
rd = request.getRequestDispatcher(template2);
rd.include(request, wrapper2 );
wrapper2 .close();
// TEXT
rd = request.getRequestDispatcher(template3);
rd.include(request, wrapper3 );
wrapper3 .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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