java将记录写入文件的新行

Question

每次代码运行时，我都希望将新记录添加到新行

正如添加新记录时一样，它将覆盖前一行

private void writeFile() {
    String FILENAME = g.getText();
    String content = results;
    FileOutputStream fos = null;
    try {
        fos = openFileOutput(FILENAME, MODE_PRIVATE);
        fos.write(content.getBytes());
        Toast.makeText(getApplicationContext(), "File Saved", 0).show();
    } catch (IOException e) {
        e.printStackTrace();
    }


}

Answer 1

在写入数据时，还需要写入“换行符”：

private void writeFile() {
    String FILENAME = g.getText();
    String content = results;
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(file);
        fos.write(content.getBytes());
        fos.write(System.getProperty("line.separator"));
    } catch (IOException e) {
        e.printStackTrace();
    }
}

但是要小心这样写二进制数据。最好使用例如BufferedWriter来写入字符串数据：

BufferedWriter writer = new BufferedWriter(new FileWriter("filename"));
writer.write("Hello world!");
writer.newLine();