Question

我有一个问题，我在使用servlet在会话中存储变量，但是当我尝试在另一个servlet上获取相同的变量时，我得到了这个错误：

java.lang.NumberFormatException: For input string: ""

这是我存储信息的servlet：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    String appointmentId = request.getParameter("selectEditPatientAppointment");

    System.out.println(appointmentId);
    request.getSession().setAttribute("appointmentToEdit", appointmentId);

    response.sendRedirect("doctorEditAppointmentForm.jsp");
}

这是我尝试获取变量的那个，我得到了错误：

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    Date date = convertStringToDate(request.getParameter("appointmentDate"));
    String time = request.getParameter("appointmentTime");
    String doctorId = request.getParameter("selectEditDoctor");
    String patientId = request.getParameter("selectEditPatient");
    String description = request.getParameter("description");
    String results = request.getParameter("results");
    String test = request.getParameter("appointmentToEdit");

    System.out.println("Esto: " + test);
    int appointmentId = Integer.parseInt(request.getParameter("appointmentToEdit"));

    ListService service = new ListService();
    Doctor doctor = service.getDoctor(doctorId);
    Patient patient = service.getPatient(patientId);
    Set patientappointmentses = new HashSet(patient.getPatientrecord().getPatientappointmentses());
    Patientrecord patientRecord = new Patientrecord(patient,patientappointmentses);
    patientRecord.setPatientRecordId(patientId);

    RegisterService registerService = new RegisterService();
    registerService.patientRecordExists(patientRecord);

    PatientappointmentsId patientappointmentsId = new PatientappointmentsId(appointmentId,patientId);

    Patientappointments patientAppointments = new Patientappointments(patientappointmentsId,doctor,patientRecord,date,time,description,results);


   try {
        EditService editService = new EditService();
        editService.edit(patientAppointments, patientappointmentsId);
        response.sendRedirect("doctorAppointmentEdited.jsp");
    } finally {
        out.close();
    }
}

变量名是appointmentToEdit，当我打印到控制台时，我在第一个servlet上正确获取了信息。

感谢您的帮助。

Answer 1

您存储在会话中的variable

所以

你应该通过这种方式得到变量

 request.getSession().getAttribute("appointmentToEdit")

希望这有帮助

将变量存储在servlet中的问题

1 个答案: