Java EOFException 问题 ObjectInputStream

Question

我正在尝试为 'Accounts' 的列表实现 load/save，其方法与我已经成功用于 HashMap 的方法类似。

背景：

private List<Account> accounts;

public AccountManager() {
    try {
        accounts = LoadSave.loadAccounts();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

在这里，我想将我的帐户列表设置为包括已保存的帐户。

Load/Save 实现：

public static void saveAccounts(List<Account> accounts) throws IOException {
    try {
        FileOutputStream fos = new FileOutputStream("accounts.ser");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(accounts);
        oos.close();
        fos.close();
        System.out.printf("Saved account.");
    }
    catch(IOException ioe) {
        ioe.printStackTrace();
    }
}

public static List<Account> loadAccounts() throws IOException {
    List<Account> accounts = null;
    try {
        FileInputStream fis = new FileInputStream("accounts.ser");
        ObjectInputStream ois = new ObjectInputStream(fis);
        accounts = (List<Account>) ois.readObject();
        ois.close();
        fis.close();
    }
    catch(IOException ioe) {
        ioe.printStackTrace();
    }
    catch(ClassNotFoundException c) {
        System.out.println("Class not found");
        c.printStackTrace();
    }

    return accounts;
}

问题是当我第一次初始化 AccountManager 时，accounts.ser 文件没有保存的帐户，因为该功能是在后面的方法中实现的，因此我得到了这个例外：

java.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2681) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3156) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:862) at java.io.ObjectInputStream.(ObjectInputStream.java:358) at implementatons.inventory_model.LoadSave.loadAccounts(LoadSave.java:69) at billing.AccountManager.(AccountManager.java:81) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51) at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927) at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971) at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220) at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744) at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441) at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409) at implementatons.inventory_model.InventoryCatalogue.seeAccounts(InventoryCatalogue.java:187) 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 sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771) at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Node.fireEvent(Node.java:8411) at javafx.scene.control.Button.fire(Button.java:185) at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182) at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:96) at com.sun.javafx.scene.control.skin.BehaviorSkinBase.handle(BehaviorSkinBase.java:89) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) at javafx.event.Event.fireEvent(Event.java:198) at javafx.scene.Scene$MouseHandler.process(Scene.java:3757) at javafx.scene.Scene$MouseHandler.access00(Scene.java:3485) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent3(GlassViewEventHandler.java:432) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:937) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null7(WinApplication.java:177) at java.lang.Thread.run(Thread.java:748)

我已经尝试在捕获到 EOFExceptions 时将帐户设置为新的 ArrayList，但它仍然会抛出 EOFException。我希望每次打开帐户管理器时都能加载帐户 window，因此我需要能够在构造函数中加载帐户。

Answer 1

能够在填充文件时加载帐户或使用以下代码将帐户设置为空 ArrayList：

public static List<Account> loadAccounts() throws IOException {
    List<Account> accounts = null;
    try {
        File file = new File("accounts.ser");
        if (file.length() == 0) {
            accounts = new ArrayList<>();
        } else {
            FileInputStream fis = new FileInputStream("accounts.ser");
            ObjectInputStream ois = new ObjectInputStream(fis);
            accounts = (List<Account>) ois.readObject();
            ois.close();
            fis.close();
        }
    }
    catch(IOException ioe) {
        ioe.printStackTrace();
    }
    catch(ClassNotFoundException c) {
        System.out.println("Class not found");
        c.printStackTrace();
    }
    return accounts;
}

我只需要简单地检查文件和 return 对象的长度（如果它不是零）和一个空的 ArrayList（如果它是零）。

Java EOFException 问题 ObjectInputStream

Java EOFException issue ObjectInputStream

java

exception

eof

fxml

fxmlloader