Question

我使用这个功能：

> private void writeToFile(String data) {
>     try {
>         OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("mywords.txt",
> Context.MODE_PRIVATE));
>         outputStreamWriter.write(data);
>         outputStreamWriter.close();
>     }
>     catch (IOException e) {
>         Log.e("Exception", "File write failed: " + e.toString());
>     }  }

我想写很多次，每次我写它改变就像删除所有并添加我写的新东西但我不想删除

哈士奇谢谢我不知道为什么你删除你的评论它有效我改为MODE_APPEND

另一个问题我如何在文本文件中做空间

Answer 1

将true作为第二个参数传递给FileOutputStream，以附加模式打开文件。

OutputStreamWriter writer = new OutputStreamWriter(
                            new FileOutputStream("mywords.txt", true), "UTF-8");

Answer 2

默认情况下，OutputStreamWriter会覆盖。为了将信息附加到文件，您必须在构造函数中提供其他信息。有关详细信息，另请参阅OutputStreamWriter does not append。

Answer 3

试试这个：

  private void writeToFile(String data) {


    File file = new File("mywords.txt");

    FileOutputStream fos = null;

    try {

        fos = new FileOutputStream(file, true);

        // Writes bytes from the specified byte array to this file output stream 
        fos.write(data.getBytes());

    }
    catch (FileNotFoundException e) {
        System.out.println("File not found" + e);
    }
    catch (IOException ioe) {
        System.out.println("Exception while writing file " + ioe);
    }
    finally {
        // close the streams using close method
        try {
            if (fos != null) {
                fos.close();
            }
        }
        catch (IOException ioe) {
            System.out.println("Error while closing stream: " + ioe);
        }

    }
  }

多次写入文本文件android

3 个答案: