manipulate HttpServletResponse content in ServletFilter

[Joe carco]

Hello,

does anyone know if its possible to change the content of an HttpServletResponse in a ServletFilter?
I know that as long as the response hasn't been committed, I can add content as follows:

public class MyFilter implements Filter {

    public void init(FilterConfig filterConfig) throws ServletException {
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        chain.doFilter(request, response);
        PrintWriter writer = response.getWriter();
        writer.write("bla");
    }

    public void destroy() {
    }
}

but is it possible to capture the responseoutput and change its contents according to certain rules?

[Ulf Dittmer]

That's possible by creating a wrapper around the response. See http://www.oracle.com/technetwork/java/filters-137243.html for an example.

[amit punekar]

Hi,
I had written a small example earlier on this.
Check it out here.

Regds,
Amit

[Joe carco]

Thanks Ulf! that was exactly what I was looking for!