一、判断文件是否存在，不存在则创建
File file = new File("d:\\test.txt");
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("文件已创建");
} else {
System.out.println("文件已存在");
}相关学习视频推荐：java视频教程
二、判断文件夹是否存在，不存在则创建
File folder = new File("d:\\test1\\test2");
if (!folder.exists() && !folder.isDirectory()) {
folder.mkdirs();
System.out.println("创建文件夹");
} else {
System.out.println("文件夹已存在");
}推荐教程：java快速入门
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