1. 添加依赖
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
2. 使用
此处获取C盘Tools文件夹大小
public void getSize() {
long size = FileUtils.sizeOfDirectory(new File("C:/Tools"));
System.out.println("Size: " + size + " bytes");
}