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How to determine whether a file folder exists in java (code attached)

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2019-11-25 11:52:1724116browse

How to determine whether a file folder exists in java (code attached)

1、判断文件夹是否存在,不存在则创建:(java相关视频教程推荐:java视频教程

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");
}

public boolean exists()测试此抽象路径名表示的文件或目录是否存在,返回:当且仅当此抽象路径名表示的文件或目录存在时,返回true;否则返回false。

java中的isDirectory()是检查一个对象是否是文件夹。返回值是boolean类型的。如果是则返回true,否则返回false。

调用方法为:对象.isDirectory() 无需指定参数。

2、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");
}

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