how to convert PrintWriter to String or write to a File?

Question

I am generating dynamic page using JSP, I want to save this dynamically generated complete page in file as archive.

In JSP, everything is written to PrintWriter out = response.getWriter();

At the end of page, before sending response to client I want to save this page, either in file or in buffer as string for later treatment.

How can I save Printwriter content or convert to String?

Answer 1

To get a string from the output of a PrintWriter, you can pass a StringWriter to a PrintWriter via the constructor:

@Test
public void writerTest(){
    StringWriter out    = new StringWriter();
    PrintWriter  writer = new PrintWriter(out);

    // use writer, e.g.:
    writer.print("ABC");
    writer.print("DEF");

    writer.flush(); // flush is really optional here, as Writer calls the empty StringWriter.flush
    String result = out.toString();

    assertEquals("ABCDEF", result);
}