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我有一个读取方法，如果它不存在，它将尝试创建一个新文件，但是当我运行代码时，我得到一个（系统找不到指定的文件）错误。有人可以解释为什么它不创建文件吗？我还想知道如何在父目录中创建文件，而不是在当前保存它的目录中？

代码：

public Set<String> readWindowTitleSet() {
    try {
        File file = new File("windowData.out");

        String absolutePath = file.getAbsolutePath();
        String filePath = absolutePath.
            substring(0,absolutePath.lastIndexOf(File.separator));


        if (!file.exists()) {
            file.createNewFile();
        }

        FileInputStream fis = new FileInputStream(filePath +"\\..\\" + "windowData.out");
        // this is for testing in Eclipse.


        //FileInputStream fis = new FileInputStream(absolutePath);
        // This is for use in Jar file.

        ObjectInputStream ois = new ObjectInputStream(fis);
        anotherList = (HashSet<String>) ois.readObject();
        ois.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return anotherList;

}

错误

java.io.FileNotFoundException: C:\Users\Joe\workspace\VocabTool\..\windowData.out (The     system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at model.WindowTitleDataStore.readWindowTitleSet(WindowTitleDataStore.java:60)
at model.WindowTitleDataStore.<init>(WindowTitleDataStore.java:18)
at controller.InterruptionDecision.<clinit>(InterruptionDecision.java:23)
at view.MainGui.<init>(MainGui.java:29)
at view.MainGui.main(MainGui.java:38)
Exception in thread "main" java.lang.ExceptionInInitializerError
at view.MainGui.<init>(MainGui.java:29)
at view.MainGui.main(MainGui.java:38)
Caused by: java.lang.NullPointerException
at model.WindowTitleDataStore.<init>(WindowTitleDataStore.java:19)
at controller.InterruptionDecision.<clinit>(InterruptionDecision.java:23)
... 2 more

路径改变后的错误

java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at model.WindowTitleDataStore.readWindowTitleSet(WindowTitleDataStore.java:63)
at controller.InterruptionDecision.interruptNow(InterruptionDecision.java:165)
at controller.InterruptionDecision.updateWindowTitle(InterruptionDecision.java:74)
at controller.FocusWindowName.getFocusWindowTitle(FocusWindowName.java:27)
at controller.FocusWindowName.run(FocusWindowName.java:42)
at java.lang.Thread.run(Unknown Source)
Exception in thread "Thread-6" java.lang.NullPointerException
at model.WindowTitleDataStore.getWindowDataSize(WindowTitleDataStore.java:105)
at     controller.InterruptionDecision.getWindowDataStoreSize(InterruptionDecision.java:95)
at controller.InterruptionDecision.interruptNow(InterruptionDecision.java:168)
at controller.InterruptionDecision.updateWindowTitle(InterruptionDecision.java:74)
at controller.FocusWindowName.getFocusWindowTitle(FocusWindowName.java:27)
at controller.FocusWindowName.run(FocusWindowName.java:42)
at java.lang.Thread.run(Unknown Source)
4

1 回答 1

1

..从你的路径中删除它

它应该是
FileInputStream fis = new FileInputStream(filePath +"\\windowData.out");

代替
FileInputStream fis = new FileInputStream(filePath +"\\..\\" + "windowData.out");

因为filePath +"\\..\\" + "windowData.out"将等于C:\Users\Joe\workspace\VocabTool\..\windowData.outwhich 不是您文件的有效位置。

虽然filePath +"\\windowData.out"将等于C:\Users\Joe\workspace\VocabTool\windowData.out我猜你的文件的有效位置（猜你在指定目录中有一个文件 windowData.out）

于 2013-02-16T16:40:08.757 回答