Question

I followed this tutorial for uploading a file in my JSF2 application.
The application works fine but I am unhappy with one aspect.
While rebuilding the request, the File sent via request is saved somewhere on the disk.

Even though the file is saved I need to rename the file with a name which is available after entering the Managed Bean containing the action method.

Therefore I decided to create a new file with de desired name, copy the already saved file, and then delete the unneeded one.

private File uploadFile;
//...
try {
    BufferedWriter bw = new BufferedWriter(new FileWriter(newFile));
    BufferedReader br = new BufferedReader(new FileReader(uploadFile));

    String line = "";
    while ((line = br.readLine()) != null){
        bw.write(line);
    }
} catch (Exception e){}

The new file appears in the desired location but this error is thrown when I’m trying to open the file: “Invalid or unsupported PNG file”

These are my questions:

1. Is there a better way to solve this problem?
2. Is this solution the best way to upload a picture? Is there a reason to save the file before the business logic when there may be need to resize the picture or the desired name is not available yet.

LE:
I know abot this tutorial as well but I’m trying to do this mojarra only.