public class HelloServlet extends HttpServlet {	@Override	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {	}	@Override	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {	doGet(req, resp);	}	@Override	public void init() throws ServletException {	System.out.println("进入 服务器...");	} }