public static boolean DeleteFormFile(int offset, int size, File file){
        byte[] data1 = new byte[1];
        byte[] data2 = new byte[1];
        int offset2 = offset+size;
        int size1 = offset;
        int size2 = (int) file.length() - offset2;
        String name = file.getAbsolutePath();
        name = name+ ".temp";
        File tempfile = new File(name);
        try{
            tempfile.createNewFile();
            RandomAccessFile rafr = new RandomAccessFile(file.getAbsoluteFile(), "r");
            if(size1 != 0 ){
                data1 = new byte[size1];
                rafr.seek(0);
                rafr.read(data1);
            }
            if(size2 != 0){
                data2 = new byte[size2];
                rafr.seek(offset2);
                rafr.read(data2);
            }
            rafr.close();
            RandomAccessFile rafrw = new RandomAccessFile(tempfile.getAbsoluteFile(), "rw");
            if(size1 != 0 ){
                rafrw.seek(0);
                rafrw.write(data1);
            }
            if(size2 != 0){
                rafrw.seek(size1);
                rafrw.write(data2);
            }
            rafrw.close();
            file.delete();
            tempfile.renameTo(file);
        }
        catch(Exception e){
            return false;
        }

        return true;
    }