public void querryAllBooks(HttpServletRequest request, HttpServletResponse response){
		try{
		BookDAO bdao = new BookDAO();
		ArrayList al = bdao.querryAllBooks();
		request.setAttribute("allBooks", al);
		request.getRequestDispatcher("../userView/userpage.jsp").forward(request, response);
		}catch(Exception e){
			
			e.printStackTrace();
		}
	}