Javafx SimpleStringProperty反序列化抛出IllegalStateException：未读的块数据

Question

我正在使用javafx开发应用程序。我必须将数据保存在文件中。我正在使用序列化，但是由于我正在使用SimpleStringProperty，所​​以我遇到了问题。 SimpleStringProperty无法序列化，因此我创建了两个方法writeObject和readObject。写方法效果很好（我认为是在文件中写），但读方法却不行。当我读取保存文件时，我得到了

java.lang.IllegalStateException: unread block data throwed.

这是我的数据的类图。我想保存的是员工。

    private void writeObject(ObjectOutputStream s) throws IOException
    {
        s.defaultWriteObject();
        s.writeInt(id);
        s.writeUTF(firstname.get());
        s.writeUTF(lastname.get());
        s.writeUTF(phoneNumber.get());
        s.writeBoolean(gender.get());
    }

    private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException
    {
        id = s.readInt();
        firstname.set(s.readUTF());
        lastname.set(s.readUTF());
        phoneNumber.set(s.readUTF());
        gender.set(s.readBoolean());
    }

您知道问题可能是什么吗？

java.lang.IllegalStateException: unread block data
at java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2783)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1605)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2287)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
at java.util.ArrayList.readObject(ArrayList.java:797)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1170)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2178)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
at sample.Main.loadData(Main.java:61)
at sample.Main.start(Main.java:27)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)

Answer 1

好吧，我所缺少的是，在调用readObject时，该对象未初始化，因此readObject的行为类似于构造函数。所有null和firstname.set(s.readUTF());都引发空指针异常的SimpleProperties。

Answer 2

您可以使用不带javafx属性的普通pojo， 这甚至可以帮助您使用框架。有简单的解决方法。需要何时将它们转换为属性。 但是，这是反序列化javafx属性的有效示例 https://gist.github.com/james-d/a7202039b00170256293