XML in servlet response

Question posted by: mkwg (Newbie) on August 21st, 2008 08:11 PM

Hi,
I wonder if anyone can help with this question.
I have a test servlet that simply echoes back XML text that is sent to it, with UTF-8 encoding. Here's the servlet code:

public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/xml");
response.setCharacterEncoding("UTF-8");
ServletInputStream sis = request.getInputStream();
ServletOutputStream sos = response.getOutputStream();
//File file = new File("C:/echo.xml");
//FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[1024];
int i = 0;
while((i=sis.read(buf))!=-1) {
sos.write(buf, 0, i);
//fos.write(buf, 0, i);
}
sis.close();
sos.close();
//fos.close();
}

The XML text that arrives in the request has the header:
<?xml version="1.0" encoding="UTF-8"?>

The file output (commented out in the code above) shows the header:
<?xml version="1.0" encoding="UTF-8"?>

But the XML text that appears in the response has the header:
<?xml version="1.0"?>
The response header contains, as expected:
Content-Type: text/xml;charset=UTF-8


I'm assuming that this is some behavior of the ServletResponse interface.
If so:
- is this documented?
- is there any way to control/prevent it, so that the XML text in the response shows the same header?

Many thanks for any help/advice with this.
MKWG

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