Render a jsp page from code and get the rendered html output as a string

Question

What's the easiest way to make a JSP page render, then get the rendered html content as a string?

Answer 1

There is this tutorial, which explains every step with code:

http://valotas.com/get-output-of-jsp-or-servlet-response/

Doing it this way has advantages when the JSP is not accessible by URL directly.

Answer 2

You should provide your own wrapper for the Writer of HttpServletResponse (via HttpServletResponseWrapper in a Filter), and each time you write to that writer, also store in a StringBuilder.

That's just a sketch of the code, there is a sufficient number of examples, but the main steps are:

• create a filter
• wrap PrintWriter to make it store each write in a builder
• extend HttpServletResponseWrapper and make it return the writer wrapper
• create chain.doFilter(request, new HttpServletResponseWrapper(response))