Unfortunately everything is on our intranet, no access from the outside. The
actual servlet that I have is pretty trivial, it simply takes 2 urls, one
being a URL that returns XML that describes the graph to make, and the other
the URL of the XSL stylesheet that transforms the XML into proper SVG. The
servlet simply spits the result of the two back to the browser.
I've been wanting to look at the batik stuff to see what it offers, but I
haven't had a chance yet and I'm using the Oracle XML utils for the XSL
transforming.
If there's interest, I'll see if I can get it installed on my home machine
and made available to see. Its a bit rough around the edges right now and
the documentation is pretty no existent, but maybe its of use to people.
-----Original Message-----
From: stefan werner [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 29, 2001 3:21 AM
To: [EMAIL PROTECTED]
Subject: Re: chart in jsp
hi jeff ,hi all,
the servlet you use is a servlet 2.3 stuff, i think.
is there any url to take a look at this code?
i am involved in creating svg's and not very familar with writing servlets.
but i'd like to show my interactive work.
i tried this ( i found in german java-magazin 04/2001):
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import org.apache.batik.transcoder.*;
import org.xml.sax.*;
import java.io.*;
public class BatikFilter implements Filter{
private FilterConfig config = null;
private String format = "jpeg";
public BatikFilter() {
}
public void doFilter(ServletRequest parm1, ServletResponse parm2,
FilterChain parm3) throws java.io.IOException,
javax.servlet.ServletException {
SpoofResponse spoof = new SpoofResponse();
parm3.doFilter(parm1, spoof);
String uri = "";
if (parm1 instanceof HttpServletRequest)
{
HttpServletRequest httpReq = (HttpServletRequest) parm1;
uri = httpReq.getRequestURI().toString();
}
String localFormat = (String) parm1.getParameter("format");
if (localFormat != null) format = localFormat;
try
{
String ctype = parm1.getContentType();
if ((ctype == null) | ((ctype != null) && (ctype.indexOf("svg")
!= -1)))
{
Class transcoderClass = (Class) handlers.get(format);
if (transcoderClass == null) return;
Transcoder trans = (Transcoder) transcoderClass.newInstance();
trans.addTranscodingHint(org.apache.batik.transcoder.XMLAbstractTranscoder.K
EY_XML_PARSER_CLASSNAME,
"org.xml.sax.XMLReader");
ByteArrayOutputStream os = new ByteArrayOutputStream();
TranscoderInput tip = new TranscoderInput (new InputStreamReader
(new ByteArrayInputStream (spoof.getBuffer())));
tip.setURI(uri);
TranscoderOutput top;
if (format.equals ("svg"))
{
top = new TranscoderOutput (new OutputStreamWriter (os));
}
else
{
top = new TranscoderOutput (os);
}
trans.transcode(tip, top);
byte[] buffer = os.toByteArray();
parm2.setContentType((String) mimetypes.get(format));
parm2.getOutputStream().write(buffer);
}
else
{
String result = "<html><body>Content filtered!</body></html>";
parm2.setContentType("text/html");
parm2.reset();
parm2.getWriter().print(result);
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
public FilterConfig getFilterConfig() {
return config;
}
public void setFilterConfig(FilterConfig parm1) {
config = parm1;
}
private static Map handlers = new HashMap();
private static Map mimetypes = new HashMap();
{
handlers.put ("jpeg",
org.apache.batik.transcoder.image.JPEGTranscoder.class);
handlers.put ("png",
org.apache.batik.transcoder.image.PNGTranscoder.class);
handlers.put ("svg",
org.apache.batik.transcoder.svg2svg.SVGTranscoder.class);
mimetypes.put ("jpeg", "image/jpeg");
mimetypes.put ("png", "image/png");
mimetypes.put ("svg", "image/svg+xml");
}
}
class SpoofResponse extends ResponseBase { }
but sax isn't instanciated correctly( no empty public constructor)
any idea that makes me happy?
thanks
stefan
----- Original Message -----
From: "Noll, Jeff HS" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, March 27, 2001 5:15 PM
Subject: RE: chart in jsp
With a little bit of effort, you can make some pretty impressive completely
dynamic graphs using SVG. I actually use a servlet for this that transforms
XML data from oracle into SVG. Then I use a <jsp:include> to get the graph
into the jsp page. Of course, the one caveat is that it requires an SVG
plugin to view the graph, but once you have it its a great tool.
I've got it set up so that once the query to get the XML out of Oracle is
written, I can do bar, pie, and line graphs complete with drill down views
of just about any data. The real work is in the XSL stylesheet you create,
which definately isn't a trivial task.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 27, 2001 12:21 AM
To: [EMAIL PROTECTED]
Subject: Re: chart in jsp
The only dynamic charts I've seen have used fixed size images combined
dynamically to form a graph, chart, tree, etc.
sorry, no code.
Neill Laney
http://home.nc.rr.com/nlaney
--
Web Developer/Technical Support Specialist.
Altuğ
Altıntaş To:
"'[EMAIL PROTECTED]'"
(Koç.Net) <[EMAIL PROTECTED]>
<[EMAIL PROTECTED] cc:
et> Subject: chart in jsp
03/26/2001
05:24 AM
Please
respond to
tomcat-user
are there any way to draw a dynamic chart in jsp ?
any source or idea ?
thanks ..
