Hello,
I firstly made a simple program that converted images to any of the
desired format by user using JAI.
Then i thought of trying similar stuff on GWT.
As FileOutputStream idoes not work with GWT, i first tried to make a
program where user can upload an image and then download it.
Now i want to kind of merge these two and i'm really very confused.
String fileName = (String)req.getParameter("fileName");
File file=new File("c:/users/rohit/desktop/"+fileName);
int length=0;
// Load the input image.
RenderedOp src = JAI.create("fileload", file);
// Encode the file as a JPEG image.
OutputStream os=null;
try {
os =new FileOutputStream(file);
} catch (FileNotFoundException e) {
System.out.println("Cannot write the JPEG File");
e.printStackTrace();
}
JPEGEncodeParam param = new JPEGEncodeParam();
ImageEncoder enc = ImageCodec.createImageEncoder("JPEG", os,
param);
try {
enc.encode(src);
} catch (IOException e) {
System.out.println("Exception in encoding");
e.printStackTrace();
}
try {
os.close();
} catch (IOException e) {
System.out.println("Error in closing file");
e.printStackTrace();
}
ServletContext context =getServletConfig().getServletContext();
//String mimetype=context.getMimeType(fileName);
String mimetype="image/jpeg";
resp.setContentType(mimetype);
//resp.setContentLength((int)file.length());
resp.setHeader("Content-Disposition", "attachment; filename=
\""+fileName+"\"");
ServletOutputStream op = resp.getOutputStream();
byte[] buffer = new byte[4096];
DataInputStream in=new DataInputStream(new
FileInputStream(file));
while ((os!=null)&&((length = os.read(buffer))!=-1)){
op.write(buffer, 0, length);
}
os.close();
op.flush();
op.close();
}
above is the code of the server side. I store the file on hard disk
after getting it uploaded from user.
The above code is wrong. Basically i need an alternative to
FileOutputStream.
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