Question

我尝试使用ObjectOutputStream从SWT打开/保存文本对象。但它不起作用。有什么想法，为什么？

public static void read(String fileName, Text textField) {
    int c=0;
    try {
        ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName));

        c= in.readInt();

        textField = (Text) in.readObject();

        in.close();
    } 
    catch(IOException e){
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
}

public static void write(String fileName, Text textField) {
    int c = 1;
    try {
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(fileName));
        out.writeInt(c);
        out.writeObject((Text)textField);

        out.close();

    } 
    catch(IOException e){
        e.printStackTrace();
    }
}

我保存时控制台上显示的错误：

java.io.NotSerializableException: org.eclipse.swt.widgets.Text
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.writeObject(Unknown Source)
    at FileIO.write(FileIO.java:42)
    at SelectionAdapterSave.widgetSelected(SelectionAdapterSave.java:29)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
    at Editor.open(Editor.java:230)
    at EditorMain.main(EditorMain.java:6)

这是当我尝试打开文件时，我之前保存的内容：

Caused by: java.io.NotSerializableException: org.eclipse.swt.widgets.Text
    at java.io.ObjectOutputStream.writeObject0(Unknown Source)
    at java.io.ObjectOutputStream.writeObject(Unknown Source)
    at FileIO.write(FileIO.java:42)
    at SelectionAdapterSave.widgetSelected(SelectionAdapterSave.java:29)
    ... 7 more

Answer 1

您只能对实现ObjectOutputStream的对象使用Serializable。 SWT Text类没有实现这一点。

SWT Text类包含依赖于本机UI代码的各种对象，无法再保存和加载它。

使用ObjectOutput / InputStream打开/保存SWT文本对象

1 个答案: