在一个Servlet+JSP技术开发的登录跳转的web应用中，使用MVC的分层技术，并加入数据库的支持。要求使用数据库连接池技术。数据层dao的实现方式要求使用DBUtils工具。

首先，我们需要在web.xml中配置Servlet和JSP的映射关系，以及数据库连接池的配置信息。例如：

<web-app>
  <servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.example.LoginServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>
  
  <resource-ref>
    <description>DB Connection Pool</description>
    <res-ref-name>jdbc/mydb</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>
  
  <context-param>
    <param-name>db.username</param-name>
    <param-value>root</param-value>
  </context-param>
  <context-param>
    <param-name>db.password</param-name>
    <param-value>root</param-value>
  </context-param>
  <context-param>
    <param-name>db.url</param-name>
    <param-value>jdbc:mysql://localhost:3306/mydb</param-value>
  </context-param>
  <context-param>
    <param-name>db.driver</param-name>
    <param-value>com.mysql.jdbc.Driver</param-value>
  </context-param>
</web-app>

接着，我们需要在数据层dao中使用DBUtils工具来访问数据库。例如：

public class UserDao {
  private static QueryRunner runner;
  static {
    DataSource ds = null;
    try {
      Context ctx = new InitialContext();
      ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mydb");
    } catch (NamingException e) {
      e.printStackTrace();
    }
    runner = new QueryRunner(ds);
  }
  
  public User getUser(String username, String password) throws SQLException {
    String sql = "SELECT * FROM users WHERE username=? AND password=?";
    Object[] params = {username, password};
    return runner.query(sql, new BeanHandler<>(User.class), params);
  }
}

最后，在Servlet中调用dao层的方法，并将结果存储到request中，然后转发到JSP页面进行显示。例如：

public class LoginServlet extends HttpServlet {
  private UserDao userDao;
  
  public void init() {
    userDao = new UserDao();
  }
  
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    request.getRequestDispatcher("/login.jsp").forward(request, response);
  }
  
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    try {
      User user = userDao.getUser(username, password);
      if (user != null) {
        request.setAttribute("user", user);
        request.getRequestDispatcher("/success.jsp").forward(request, response);
      } else {
        request.setAttribute("error", "Invalid username or password");
        request.getRequestDispatcher("/login.jsp").forward(request, response);
      }
    } catch (SQLException e) {
      e.printStackTrace();
      request.setAttribute("error", "Database error");
      request.getRequestDispatcher("/login.jsp").forward(request, response);
    }
  }
}

这样，我们就完成了一个使用MVC分层技术、数据库连接池技术和DBUtils工具的登录跳转web应用。