[JAVA] 遍历文件夹

FileUtil.java

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;

public class FileUtil {
    public static void main(String[] args) {
        List list = getFileList("c:/fakepath/", true);
        System.out.println(list.size());
    }

    public static List getFileList(String path, boolean isSortDesc) {
        List list = getFileList(path);
        if (isSortDesc) {
            list.sort(Comparator.comparing(File::getAbsolutePath));
        } else {
            list.sort((f1, f2) -> f2.getAbsolutePath().compareTo(f1.getAbsolutePath()));
        }
        return list;
    }

    public static List getFileList(String path) {
        List rsList = new ArrayList<>();
        if (path == null || path.equals("")) {
            System.out.println("Error: path is blank.");
            return rsList;
        }
        File file = new File(path);
        if (!file.exists()) {
            System.out.println("Error: path is not existed.");
            return rsList;
        }
        // 处理文件
        if (file.isFile()) {
            System.out.println("Info: Only has a file.");
            rsList.add(file);
            return rsList;
        }
        // 处理文件夹
        if (null == file.listFiles()) {
            System.out.println("Info: Only has a empty directory.");
            rsList.add(file);
            return rsList;
        }
        int fileNum = 0;
        int folderNum = 0;
        LinkedList forDealList = new LinkedList<>();
        forDealList.addAll(Arrays.asList(file.listFiles()));
        while (!forDealList.isEmpty()) {
            File firstFile = forDealList.removeFirst();
            // 把文件自身先加入结果
            rsList.add(firstFile);
            // 处理文件
            if (firstFile.isFile()) {
                // System.out.println("文件:" + firstFile.getAbsolutePath());
                fileNum++;
                continue;
            }
            // 处理文件夹
            folderNum++;
            // System.out.println("文件夹:" + firstFile.getAbsolutePath());
            File[] files = firstFile.listFiles();
            if (files == null) {
                continue;
            }
            for (File curr : files) {
                if (curr.isDirectory()) {
                    // 将此文件夹放入待处理列表
                    forDealList.add(curr);
                } else {
                    rsList.add(curr);
                    // System.out.println("文件:" + curr.getAbsolutePath());
                    fileNum++;
                }
            }
        }
        System.out.println("文件夹数量:" + folderNum + ",文件数量:" + fileNum);
        return rsList;
    }
}