Hi,
I'm having a problem displaying jpeg images via a servlet...
Context:
The jpeg images are being passed from another java application
in the form of a byte[]. The function of the servlet is to grab
the byte[] and display it on a dynamically created html page.
I initially tried using the jpeg encoder from www.acme.com. Their GIF
encoder works great but I was unable to get their JPEG encoder to work
so I turned to the jpeg encoder built into JDK 1.2 which seems to require
transforming Image to BufferedImage.
The code snippet below produces an image on the html page with the correct
dimensions, but the image is solid black. Can anyone provide some pointers
as to where I went astray or suggest a better way of handling the
transformation from byte[] to BufferedImage? thanks in advance.
Ross
.
.
.
//dataStream is a byte[] with the image data
response.setContentType("image/jpeg");
ServletOutputStream out = response.getOutputStream();
BufferedImage bi = draw(dataStream);
encode(bi,out);
.
.
.
public static BufferedImage draw(byte[] dataStream) {
BufferedImage bi =
new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = bi.createGraphics();
Image image = Toolkit.getDefaultToolkit().createImage(dataStream);
g2d.drawImage(image,null,null);
g2d.dispose();
return(bi);
}//end draw
public static void encode(BufferedImage bi, OutputStream out)
throws IOException {
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
param.setQuality(1.0f,false);
encoder.encode(bi,param);
}//end encode
___________________________________________________________________________
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff SERVLET-INTEREST".
Archives: http://archives.java.sun.com/archives/servlet-interest.html
Resources: http://java.sun.com/products/servlet/external-resources.html
LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
