Store Output Stream into String

Question

Hello
I want to store my out put stream in to string so that i can use it latter.
out.println("Nilesh patel");
out.println("[email protected]");
out.println("Ahmedabad");
it is "Nilesh patel [email protected] Ahmedabad" but i want to store into string like
String tmp = out.toString();
it is return the hash code of out object how can i store this value in String variable?

Answer 1

To me, the most elegant way to do this would be with a Servlet Filter.
You use a ResponseWrapper to create a "BufferedResponse" object, and pass that down to the next JSP/Servlet. Basically you have to override methods such as getWriter(), getOutputStream()...
The JSP/servlet works as normal, but any calls to out.println() can be under your control.
This simple class might help:
public class RedirectingServletResponse extends HttpServletResponseWrapper {
    RedirectServletStream out;
     * @param arg0
    public RedirectingServletResponse(HttpServletResponse response, OutputStream out) {
        super(response);
        this.out = new RedirectServletStream(out);
    /* (non-Javadoc)
     * @see javax.servlet.ServletResponse#flushBuffer()
    public void flushBuffer() throws IOException {
        out.flush();
    /* (non-Javadoc)
     * @see javax.servlet.ServletResponse#getOutputStream()
    public ServletOutputStream getOutputStream() throws IOException {
        return out;
    /* (non-Javadoc)
     * @see javax.servlet.ServletResponse#getWriter()
    public PrintWriter getWriter() throws IOException {
        return new PrintWriter(out);
    private static class RedirectServletStream extends ServletOutputStream {
        OutputStream out;
        RedirectServletStream(OutputStream out) {
            this.out = out;
        public void write(int param) throws java.io.IOException {
            out.write(param);
}You then use it something like this:
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
  // create an output stream - to file, to memory...
  ByteArrayOutputStream out = new ByteArrayOutputStream();
  // create the "dummy" response object
  RedirectingServletResponse dummyResponse = new RedirectingServletResponse(response, out);
  // pass it on to the next level:
  chain.doFilter(request, dummyResponse);
  // at this point the OutputStream has had the response written into it.
  byte[] result = out.getByteArray();
  // now you can do with it what you will.
}There is probably a better way - providing response that will write any output to two output streams - the original and an alternative one (file) would be a good option.
Hope this helps,
evnafets