How to modify a servlet response?

Question

Hi all,
I want to modify the servlet response string returned by the portal irj servlet.
For this I created a filter.
Now my requirement is to do something like this in the doFilter method:
doFilter(ServletRequest req, ServletResponse res, FilterChain chain) {
PrinterWriter pq = res.getWriter();
Reader reader = new StringReader(printWriter.toString());
BufferedReader bufferedReader = new BufferedReader(reader);
String line;
while ((line = bufferedReader.readLine()) != null) {
line.replaceAll("Welcome", "Welcome to XXXX");
What I am trying to do is in the response stream replace the letter welcome with "Welcome to XXXX".
I know I cant accomplish this by the code given above.
Any body has a code snippet of how to get this working?
Thanks

Answer 1

Hi,
You are already in the right way, things missing are:
1. Forgot the do the filter chain     
      filterChain.doFilter(request, wrapper);
2. Write back the modified stream to response
// write the response stream           
      response.setContentLength(responseStr.length());
      response.getWriter().write(responseStr);      
You can use the HttpServletResponseWrapper to manipulate the response too, check the examples at this link:
http://www.jsp-develop.de/faq/show/47/
Greetings,
Praveen Gudapati
[Points are always welcome for helpful answers]