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

因为添加新记录时它会覆盖上一行

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

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();
    }
}

但是在编写这样的二进制数据时要小心。最好用e。 G。 BufferedWriter 写入字符串数据:

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