2、 创建File对象时，使用String类型的路径名作为参数。在输入路径字符串时需注意斜杠的正确使用。由于不同操作系统对路径分隔符的处理不同，为确保程序跨平台兼容性，通常采用File.separator来代替具体的斜杠符号，从而自动适配所在系统的路径格式。

在日常开发中，文件上传的file元素使用频繁，但其默认样式不够美观，且会显示未选中任何文件的提示，影响页面整体视觉效果。本文将介绍如何美化file输入框外观，并隐藏这一默认文字提示，从而提升用户体验与界面协调性。

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