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Java递归计算一个文件夹所有文件大小

import java.io.File;
import java.util.Scanner;
 
public class Demo1 {
 
    public static void main(String[] args) {
        File dirFile = getDirFile();
        System.out.println(countDirFile(dirFile));
    }
 
    /**
     * 计算文件夹大小
     */
    public static long countDirFile(File dirFile) {
        long num = 0L;
        File[] listFiles = dirFile.listFiles();
        for (File subFile : listFiles) {
            if (subFile.isFile()) {
                num = num + subFile.length();
            } else {
                num = num + countDirFile(subFile);
            }
        }
        return num;
    }
 
    /**
     * 获取文件夹路径
     */
    public static File getDirFile() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入文件路径");
        while (true) {
            String line = scanner.nextLine();
            File dirFile = new File(line);
            if (dirFile.isDirectory()) {
                return dirFile;
            } else {
                System.out.println("输入错误，重新输入");
            }
        }
    }
}