Question

我尝试在文件中包含20个字符后删除文件。我已经查看了有关此问题的每个Stack Overflow问题，并且没有任何答案可行。我看过每一个地方，没有任何作用。 File.delete();对我不起作用。它会写一个文件，每次按下一个按钮，它都会添加一个＆＃34; 1＆＃34;它。如果有20个1，则需要删除该文件。

示例代码：

String fileName1 = "data1.txt";
try {
    FileWriter fw = new FileWriter(fileName1, true);
    try (BufferedWriter bw = new BufferedWriter(fw)) {
        bw.write("1");
        bw.close();
    } catch (IOException ex) {
        Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
    }
} catch (IOException ex) {
    Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
try {
    Scanner scanner = new Scanner(new FileReader("data1.txt"));
    String scannerData1 = scanner.nextLine();
    if (scannerData1.equals("11111111111111111111")) {
        //In here is where its supposed to delete the file.
    }
} catch (FileNotFoundException ex) {
    Logger.getLogger(StudentRandomizerJFrame.class.getName()).log(Level.SEVERE, null, ex);
}

Answer 1

似乎对我有用......

for (int index = 0; index < 50; index++) {
    String fileName1 = "data1.txt";

    try (BufferedWriter bw = new BufferedWriter(new FileWriter(fileName1, true))) {
        bw.write("1");
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    boolean deleteMe = false;
    try (Scanner scanner = new Scanner(new FileReader("data1.txt"))) {
        String scannerData1 = scanner.nextLine();

        if (scannerData1.length() >= 20) {
            deleteMe = true;
        }
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    if (deleteMe) {
        File file = new File(fileName1);
        if (!file.delete()) {
            System.out.println("!! Could not delete " + file);
        } else {
            System.out.println(file + " was deleted");
        }
        System.out.println(file + " exists = " + file.exists());
    }
}

打印

data1.txt was deleted
data1.txt exists = false
data1.txt was deleted
data1.txt exists = false

也许您需要检查一下您是否拥有删除文件的正确权限（但如果您具有写入权限，则应该可以将其删除）并且您要删除您认为自己的文件＆＃39 ;重新删除

为什么我不能删除此文件？

1 个答案: