copy file

public static void copyFile(String originalFileName, String destFileName) 
            throws Exception {

        byte[] buffer = new byte[4096]; 
        int size = -1;

        FileInputStream fis = new FileInputStream(originalFileName); 
        FileOutputStream fos = new FileOutputStream(destFileName);

        while ((size = fis.read(buffer, 0, buffer.length)) != -1) { 
            fos.write(buffer, 0, size); 
        }

        fis.close(); 
        fos.close();

        fis = null; 
        fos = null;

    }