how to get name of all file in a directory and sub-directory in java - Stack Overflow https://stackoverflow.com/questions/8788976/how-to-get-name-of-all-file-in-a-directory-and-sub-directory-in-java

pom导入依赖

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

以.java文件为例，指定目录为directory，listFiles第三个参数表示是否递归，递归即读取子目录

import org.apache.commons.io.FileUtils;
import java.io.File;
File rootDir = new File('directory');
Collection<File> files = FileUtils.listFiles(rootDir, new String[]{"java"}, true);