由于您似乎不熟悉Java
Web编程，因此可以使用JSP（视图），Servlet（控制器）和实体，DAO和服务层（模型）来实现完整的MVC方案。这是您所拥有的：

模型：

• DBConnection 作为数据库访问类（数据访问层）
• AddRecords 作为您的DAO类（数据访问层）
• 没有类作为服务类（业务逻辑层）。对于此示例，让我们为此提供一个RecordService类：

        public class RecordService {
        public RecordService() {
        }
        //since it has no real business logic, it will serve as facade
        public String[] getRecords() {
            AddRecords addRecords = new AddRecords();
            return addRecords.populateSelect();
        }
    }

控制器：

• 尚无控制器类。由于我假设您使用的是普通Java EE：

        @WebServlet("/RecordServlet")
    public class RecordsServlet extends HttpServlet {
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            //it will fire on a GET request (like accessing directly to the URL
            //from the browser)
            //here you should load the data for the View (JSP)
            loadData(request);
            //forward to show the view
            request.getRequestDispatcher("hello.jsp").forward(request, response);
        }

        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            //it will fire on a POST request (like submitting the form using POST method)
            String selectedRecord = request.getParameter("selectedRecord");
            System.out.println(selectedRecord);
            request.setAttribute("selectedRecord", selectedRecord);
            loadData(request);
            //forward to show the view
            request.getRequestDispatcher("hello.jsp").forward(request, response);
        }

        //method to load the data available to select
        private void loadData(HttpServletRequest request) {
            RecordService recordService = new RecordService();
            String[] records = recordService.getRecords();
            //set the data as attribute on the request to be available on the View
            request.setAttribute("records", records);
        }
    }

视图：

• 您已经有一个JSP文件。由于您尚未发布姓名，因此称它为hello.jsp。我将使用JSTL调整您的实际JSP代码：

        <!-- at the beginning of the JSP, call the JSTL library -->
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

    <form action="RecordServlet" method="POST">
        Please select an element:
        <select id="selectedRecord" name="selectedRecord">
            <c:forEach items="${records}" var="record">
            <option value="${record}">${record}</option>
            </c:forEach>
        </select>
        <br />
        <input type="submit" value="Show selected record" />
        <c:if test="${not empty selectedRecord}">
            <br />
            You've selected ${selectedRecord}!
        </c:if>
    </form>

现在，要运行该示例，请构建项目并使用进行访问http://localhost:8080/YourWebProjectName/RecordServlet。另外，您可以在web.xml文件中进行设置：

  <welcome-file-list>
        <welcome-file>RecordServlet</welcome-file>
    </welcome-file-list>

只需运行Web项目。

一些注意事项：

• 使用相关名称的类/方法，我用了RecordXXX，因为你有这个AddRecord类（它应该是RecordDAO或读码器更有用的东西像UserDAO或YourEntityDAO）。
• 通过不同的包分发您的类。每个包都应只包含与其范围相关的类，即edu.home.daoDAO类，edu.home.service服务/业务逻辑类，等等。