java把数据到指定文件

String filename = "F:\\test123.txt";
FileOutputStream stream = null;
OutputStreamWriter writer = null;
try {
    stream = new FileOutputStream(filename, true);
    writer = new OutputStreamWriter(stream);
    writer.write("test");
    writer.write("%！%");
    writer.write("123");
    writer.write("\n");
} catch (Exception e) {
    e.getStackTrace();
}finally {
    try {
        writer.close();
        stream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}