Java使用递归检索文件个数

 使用到了Java.io中的File类

File类常见方法：

1.boolen exists()

2.String getName()

3.boolean isDirectory()

4.boolean isFile()

5.File[] listFiles()

 

import java.io.*;

/*
打印某个目录下所有文件和目录的名字
 */
public class FileDisplay {
    public static void main(String[] args) throws Exception{
        FileDisplay fd=new FileDisplay();
        String dirName="G:\\Users\\14616\\Pictures\\古墓丽影";
        int count=fd.printDir(dirName);
        System.out.println("文件数"+count);
    }


    public int printDir(String dirName){
        int fileCount=0;
        File dirFile=new File(dirName);
        File[] subFile=dirFile.listFiles();
        System.out.println("fileLength"+subFile.length);
        if(subFile==null||subFile.length==0)
            return 0;

        for(int i=0;i<subFile.length;i++){
            if(subFile[i].isDirectory()){
                String subDir=subFile[i].getAbsolutePath();
                System.out.println("目录"+subDir);

                fileCount+=printDir(subDir);
            }

            if(subFile[i].isFile()){
                fileCount++;
                String fileName=subFile[i].getAbsolutePath();
                System.out.println("文件"+fileName);
            }
        }
        return fileCount;
    }
}

 

输出

"G:\Program Files\Java\jdk1.8.0_121\bin\java" "-javaagent:G:\JetBrains\IntelliJ IDEA 2017.1.4\lib\idea_rt.jar=58448:G:\JetBrains\IntelliJ IDEA 2017.1.4\bin" -Dfile.encoding=UTF-8 -classpath "G:\Program Files\Java\jdk1.8.0_121\jre\lib\charsets.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\deploy.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\access-bridge-64.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\cldrdata.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\dnsns.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jaccess.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\jfxrt.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\localedata.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\nashorn.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunec.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunjce_provider.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunmscapi.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\sunpkcs11.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\ext\zipfs.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\javaws.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\jce.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\jfr.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\jfxswt.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\jsse.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\management-agent.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\plugin.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\resources.jar;G:\Program Files\Java\jdk1.8.0_121\jre\lib\rt.jar;H:\practice\out\production\practice" FileDisplay
fileLength8
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-27559-2982_0010.jpg
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-27559-2982_0011.jpg
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-27559-2982_0012.jpg
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-28633-2982_0001.jpg
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-29110-2982_0001.jpg
文件G:\Users\14616\Pictures\古墓丽影\image_rise_of_the_tomb_raider-29110-2982_0002.jpg
目录G:\Users\14616\Pictures\古墓丽影\新建文件夹
fileLength5
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹\image_rise_of_the_tomb_raider-25298-2982_0001.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹\image_rise_of_the_tomb_raider-25298-2982_0002.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹\image_rise_of_the_tomb_raider-25298-2982_0003.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹\image_rise_of_the_tomb_raider-27559-2982_0001.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹\image_rise_of_the_tomb_raider-27559-2982_0007.jpg
目录G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)
fileLength9
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-29110-2982_0003.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-29110-2982_0006.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30524-2982_0003.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0005.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0006.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0010.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0011.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0016.jpg
文件G:\Users\14616\Pictures\古墓丽影\新建文件夹 (2)\image_rise_of_the_tomb_raider-30659-2982_0017.jpg
文件数20

需要注意的是：

listFiles方法返回的对象数组的长度是当前目录下文件和子目录的总数，而不是总文件的个数。