I have updated the example of trying to transcode an SVG file to JPG and
send it to the client. First, I had the wrong MIME type, although fixing
that didn't help. Second, I realized that the transcoder might close the
output stream, which would be a Bad Thing for a servlet, so I have changed
it to transcode to a ByteArrayOutputStream, which then feeds to the
response. I also added response.reset(), but that didn't help either. I
still get the same "broken pipe" the second time I call on the servlet.
=====================
public void headerInfo( HttpServletRequest request,
HttpServletResponse response, String contentType)
{
response.setContentType( contentType );
response.setHeader("Cache-Control",
"no-cache, post-check=0, pre-check=0");
String agent = request.getHeader("User-Agent").toLowerCase();
// netscape chokes on Pragma no-cache so only send it to explorer
if (agent.indexOf("explorer") > -1){
response.setHeader("Pragma", "no-cache");
}
response.setHeader("Expires", "Thu, 01 Dec 1994 16:00:00 GMT");
}
public void emitJPG ( HttpServletRequest request,
HttpServletResponse response, String svgString )
{
ByteArrayOutputStream baos = new ByteArrayOutputStream(16384);
response.reset();
JPEGTranscoder t = new JPEGTranscoder();
t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY,
new Float(.8));
TranscoderInput input =
new TranscoderInput( new StringReader(svgString) );
try {
TranscoderOutput output =
new TranscoderOutput(baos);
t.transcode(input, output);
}
catch (Exception e)
{
System.err.println("Error in EmitJPG");
e.printStackTrace();
}
headerInfo( request, response, "image/jpeg");
try
{
baos.writeTo(response.getOutputStream());
}
catch (Exception e)
{
System.err.println("Error in writing output");
e.printStackTrace();
}
}
====================
---
J. David Eisenberg http://catcode.com/
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