我试图从GUI以及模型类的arraylist中获取数据，然后将它们放入另一个arraylist中。每次代码运行时，它都能正常工作，但是当我关闭应用程序并运行序列化程序代码时，将抛出IOException。
我从模型类访问的唯一内容是一个数组列表，但是我正在其他类中访问此数组列表，但是我没有问题。
最初，我在模型类中添加了要添加的arraylist，我认为那是引发异常的原因，因此我将其移至另一个类，但是仍在引发异常。
我已经尝试了表单上其余的事件处理程序，但这是唯一导致异常的事件处理程序。
以下是导致异常发生的代码：
private void btnRequestAppointmentActionPerformed(java.awt.event.ActionEvent evt) {
ArrayList<IAccountStrategy> observers;
observers = model.getObservers();
IAccountStrategy xx;
xx = observers.get(accountIndex);
ArrayList<Appointments> appointment;
appointment = xx.getAppointments();
Appointments app = new Appointments();
setAppointmentDates(appointment, app);
setAppointmentPatient(appointment, app);
xx.getAppointments().add(app);
JOptionPane.showMessageDialog(null, "Appointment Requested. A Secretary will check the request shortly");
}
它正在调用的类：
public void setAppointmentDates(ArrayList<Appointments> appointment, Appointments app){
String doctorsName = null;
String sDate;
Date appointmentDate = null;
Date formattedDate = null;
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
try{
doctorsName = cboDoctor.getSelectedItem().toString();
sDate = cboDate.getSelectedItem().toString();
appointmentDate = sdf.parse(sDate);
formattedDate = sdf.parse(sdf.format(appointmentDate));
}
catch(ParseException ex){
System.out.println("ParseException has been caught");
}
app.setAppointmentDate(appointmentDate);
app.setPreferredDoctor(doctorsName);
}
public void setAppointmentPatient(ArrayList<Appointments> appointment, Appointments app){
ArrayList<IAccountStrategy> observers;
observers = model.getObservers();
IAccountStrategy xx;
xx = observers.get(accountIndex);
app.setPatientID(xx.getAccountID());
app.setPatientName(xx.getFirstname() +" "+ xx.getLastname());
app.setPatientAge(xx.getAge());
app.setPatientSex(xx.getSex());
}
这是我序列化的代码，它适用于我所有其他类：
private void formWindowClosing(java.awt.event.WindowEvent evt) {
String filename = "accounts.txt";
try{
FileOutputStream file = new FileOutputStream(filename);
ObjectOutputStream out = new ObjectOutputStream(file);
out.writeObject(model);
out.close();
file.close();
}
catch(IOException ex){
System.out.println("IOException has been caught");
}
}
这是堆栈跟踪：
java.io.NotSerializableException: patientmanagementsystemv2.items.Appointments
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at java.util.ArrayList.writeObject(ArrayList.java:766)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at java.util.ArrayList.writeObject(ArrayList.java:766)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at patientmanagementsystemv2.gui.PatientHomePage.formWindowClosing(PatientHomePage.java:294)
at patientmanagementsystemv2.gui.PatientHomePage.access$000(PatientHomePage.java:28)
at patientmanagementsystemv2.gui.PatientHomePage$1.windowClosing(PatientHomePage.java:133)
at java.awt.Window.processWindowEvent(Window.java:2054)
at javax.swing.JFrame.processWindowEvent(JFrame.java:305)
at java.awt.Window.processEvent(Window.java:2013)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
我试图在今晚完成此程序，但已经尝试修复了几个小时。任何帮助都将受到感激。
答案 0 :(得分：2)
就像评论中的@Stultuske一样，您可以在stacktrace中找到原因
使用包装名称查找第一个条目。在您的情况下，请查找patientmanagementsystemv2.gui
java.io.NotSerializableException: patientmanagementsystemv2.items.Appointments
...
at patientmanagementsystemv2.gui.PatientHomePage.formWindowClosing(PatientHomePage.java:294)
at patientmanagementsystemv2.gui.PatientHomePage.access$000(PatientHomePage.java:28)
at patientmanagementsystemv2.gui.PatientHomePage$1.windowClosing(PatientHomePage.java:133)
...
在堆栈跟踪的顶部，您可以看到NotSerializableException处有一个patientmanagementsystemv2.gui.PatientHomePage.formWindowClosing(PatientHomePage.java:294。
java.io.NotSerializableException: patientmanagementsystemv2.items.Appointments
引用类型Appointments似乎未实现Serializable，并且会引发错误，因为您尝试使用formWindowClosing在out.writeObject(model)的方法Appointments中序列化{{1}的实例}。
Appointments 如果您拥有该课程，只需编写
public class Appointments implements Serializable {
// ...
}
IOException 使用catch(IOException ex)可以捕获IOException及其所有子类，包括NotSerializableException。