问题描述
我试图通过单击CANCEL按钮来停止当前的预订，该按钮调用stopReservation方法。数据已在数据库中更新，但重定向返回的列表与以前相同，没有更改。仅在重启后，我才会获得包含数据的updatetd列表。网络节目302取消，所有节目200保留，但列表中没有变化。
@WebServlet("/cancel")
public class CancelReservationServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException {
req.getRequestDispatcher("/WEB-INF/pages/cancel.jsp").forward(req,resp);
}
@Override
protected void doPost(HttpServletRequest req,IOException,NumberFormatException {
String reservId = req.getParameter("id");
if (reservId.isEmpty()) {
resp.sendRedirect(req.getContextPath() + "/cancel");
} else {
ReservationService reservationService = new ReservationService();
try {
reservationService.stopReservation(Integer.parseInt(reservId));
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
resp.sendRedirect(req.getContextPath() + "/allreservs");
}
}
}
@WebServlet("/allreservs")
public class AllReservationsServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req,IOException {
ReservationService reservationService = new ReservationService();
Set<ReservationDto> reservations = null;
try {
reservations = reservationService.getListOfReserves();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
req.setAttribute("reservations",reservations);
RequestDispatcher requestDispatcher = req.getRequestDispatcher("/WEB-INF/pages/allreservs.jsp");
requestDispatcher.forward(req,resp);
}
}
服务类别中的停止方法
public void stopReservation(Integer reservationId) throws IOException,ClassNotFoundException,SQLException {
Connection connection = ConnectionFactory.getConnection();
try {
preparedStatement = connection.prepareStatement("UPDATE reservation set isActive = false where reservationId = ?");
preparedStatement.setInt(1,reservationId);
preparedStatement.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
}
JSP
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>All reservation</title>
<link href="https://fonts.googleapis.com/css2?family=Baloo+Tamma+2:wght@500;600;700&display=swap" rel="stylesheet">
<style>
<%@include file="/styles/style.css"%>
</style>
</head>
<body>
<p>
<a href='<c:url value="/"/>'><- main page</a>
</p>
<table>
<thead>
<tr>
<th>ID</th>
<th>FULL NAME</th>
<th>MANIPULATION</th>
<th>DESCRIPTION</th>
<th>START TIME</th>
<th>END TIME</th>
<th>IS ACTIVE</th>
<th>ROOM NUMBER</th>
<th colspan="2"> CANCEL </th>
</tr>
</thead>
<c:forEach items="${reservations}" var="reservations">
<tbody>
<tr>
<td>${reservations.id}</td>
<td>${reservations.fullName}</td>
<td>${reservations.manipulationName}</td>
<td>${reservations.description}</td>
<td>${reservations.startTime}</td>
<td>${reservations.endTime}</td>
<td>${reservations.isActive}</td>
<td>${reservations.roomNumber}</td>
<td><form action="${pageContext.request.contextPath}/cancel" method="post">
<td>
<button onclick="location.href='/cancel'">cancel</button>
<input type="hidden" name="id" value="${reservations.id}">
</td>
</form></td>
</tr>
</tbody>
</c:forEach>
</table>
</body>
</html>
其他：
public Set<ReservationDto> getListOfReserves() throws IOException,SQLException {
Connection connection = ConnectionFactory.getConnection();
preparedStatement = connection.prepareStatement(GET_RESERVE_DATA);
result = preparedStatement.executeQuery();
while (result.next()) {
reservs.add(new ReservationDto(
result.getInt("reservationId"),result.getString("fullName"),result.getString("manipulationName"),result.getString("description"),result.getTimestamp("startTime"),result.getTimestamp("endTime"),result.getBoolean("isActive"),result.getInt("roomNumber")));
}
return reservs;
}
private static final String GET_RESERVE_DATA = "SELECT rsrv.reservationId,CONCAT(empl.name,' ',empl.surname) as fullname," +
"rsrv.manipulationName,rsrv.description,rsrv.startTime," +
"rsrv.endTime,rsrv.isActive,r.roomNumber,empl.employeeId,r.roomId FROM reservation AS rsrv " +
"JOIN room as r ON rsrv.roomid = r.roomId " +
"JOIN employee as empl ON rsrv.emplId = empl.employeeId ";
解决方法
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