Java，不会做有那位大lao知道的

用FileOutputStream直接拿文件再输出字符串不就行了

这...百度一下io流

            String str = "传智播客";
    String dirPath = "D://test/";
    File dir = new File(dirPath);
    if (!dir.exists()) {
        dir.mkdirs();
    }
    File file = new File(dirPath+"itcast.txt");
    try {
        FileWriter writer = new FileWriter(file);
        writer.write(str);
        writer.flush();
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

}