Java 递归、输出所有文件名、计算文件夹大小、计算文件个数

朱雀 2023-06-15 09:59 195阅读 0赞

注：路径名必须是文件夹，如果是文件则程序报错（文件数组files为空）。

1. 输出所有文件名，求文件总数

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saXUtZW5kb25nLmJsb2cuY3Nkbi5uZXQ_size_16_color_FFFFFF_t_70][]

package cn.led.file;
    
    import java.io.File;
    
    public class Test2 {
    	
    	public static void main(String[] args) {
    		File file = new File("C:\\led\\a");
    		System.out.println("文件名：");
    		long res = size(file);
    		System.out.println();
    		System.out.println("文件总数：" + res);
    	}
    
    	private static long size(File dir) {
    		long count = 0;
    		File[] files = dir.listFiles();
    		for (int i = 0; i < files.length; i++) {
    			File f = files[i];
    			if (f.isFile()) {
    				System.out.println(f.getName());
    				count++;
    			}else if(f.isDirectory()){
    				count = count+size(f);
    			}
    		}
    		
    		return count;
    	}
    }

输出结果：

![20191121211135322.png][]

2. 输出所有文件名，求文件夹大小

![20191121211724482.png][]

package cn.led.file;
    
    import java.io.File;
    
    public class Test2 {
    	
    	public static void main(String[] args) {
    		File file = new File("C:\\led\\a");
    		System.out.println("文件名：");
    		long res = size(file);
    		System.out.println();
    		System.out.println("文件夹总大小：" + res);
    	}
    
    	private static long size(File dir) {
    		long sum = 0;
    		File[] files = dir.listFiles();
    		for (int i = 0; i < files.length; i++) {
    			File f = files[i];
    			if (f.isFile()) {
    				System.out.println(f.getName());
    				sum = sum +f.length();
    			}else if(f.isDirectory()){
    				sum = sum+size(f);
    			}
    		}
    		
    		return sum;
    	}
    }

结果：

![20191121211751917.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9saXUtZW5kb25nLmJsb2cuY3Nkbi5uZXQ_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191121210920897.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9saXUtZW5kb25nLmJsb2cuY3Nkbi5uZXQ=,size_16,color_FFFFFF,t_70
[20191121211135322.png]: https://img-blog.csdnimg.cn/20191121211135322.png
[20191121211724482.png]: https://img-blog.csdnimg.cn/20191121211724482.png
[20191121211751917.png]: https://img-blog.csdnimg.cn/20191121211751917.png