1.效果图：在控制台输出所有的文件的文件名如下：

2.FileUtil.java:

package cn.gov.csrc.base.report.util;import java.io.File;
import java.util.ArrayList;public class FileUtil {/*** 获取指定目录下的所有文件名* * @param obj* @return*/public static ArrayList<File> getListFiles(Object obj) {File directory = null;if (obj instanceof File) {directory = (File) obj;} else {directory = new File(obj.toString());}ArrayList<File> files = new ArrayList<File>();if (directory.isFile()) {files.add(directory);return files;} else if (directory.isDirectory()) {File[] fileArr = directory.listFiles();for (int i = 0; i < fileArr.length; i++) {File fileOne = fileArr[i];files.addAll(getListFiles(fileOne));}}return files;}public static void main(String[] args) {String path = "D://jubao//send";ArrayList<File> list = FileUtil.getListFiles(path);for (File file : list) {System.out.println(file.getName());}}
}