Using javax.imageio in JSP

Question

Hi
I have a simple code snippet that I use to read in JPG/GIF image from a file and create a new image that is upside down . Here is my snippet.
//create upside down image
try { 
String imgPath = "\\images\\AINCC.gif";
File fImg = new File(imgPath);
BufferedImage imgREG = ImageIO.read(fImg);
int iW = imgREG.getWidth(null);
int iH = imgREG.getHeight(null);
// Flip the image vertically and horizontally (equivalent to rotating the image 180 degrees)
AffineTransform tx = AffineTransform.getScaleInstance(-1.0,-1.0);
tx.translate(-iW, -iH);
//tx.scale(0.8,0.8);
AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
BufferedImage imgUSD = op.filter(imgREG, null);
// write flipped image to a file
File fUSD = new File("images\\USD_image.tmp");
ImageIO.write(imgUSD,"jpg",fUSD);
catch (Exception e) {
e.printStackTrace();
If I use this in a stand alone Java app it works fine but it will not work from the JSP page....
I have updated my server.policy file to give /images directory read, write, delete priviledges and I tried all the variations of the path (relative, absolute, direct....)...
I get the following error from the server log:
[#|2004-05-17T13:47:56.173-0400|WARNING|sun-appserver-pe8.0|javax.enterprise.system.stream.err|_ThreadID=11;|
javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1263)
at org.apache.jsp.ecards.mailcard_jsp._jspService(mailcard_jsp.java:125)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:141)
Can someone tell me what am I missing....
My JSP page is mailcard.jsp and images are under it in the images subdirectory....
Thanks
Amir

Answer 1

Hi,
Replace the following lines:
try{
String imgPath = "\\images\\AINCC.gif";
with
<%String contextPath = request.getContextPath();%>
try{
String imgPath = <%=contextPath%> + "\\images\\AINCC.gif";
You may also need to set the web application context root.
Regards,
bazooka.