Java高效获取文件夹内按创建时间排序的最新文件

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;

public class FileTimeReader {

    public static FileTime getCreationTime(Path filePath) throws IOException {
        BasicFileAttributes attr = Files.readAttributes(filePath, BasicFileAttributes.class);
        return attr.creationTime();
    }

    public static void main(String[] args) {
        Path file = Paths.get("/usr/documents/archive/example.txt"); // 替换为实际文件路径
        try {
            FileTime creationTime = getCreationTime(file);
            System.out.println("文件创建时间: " + creationTime);
        } catch (IOException e) {
            System.err.println("无法读取文件属性: " + e.getMessage());
        }
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.FileTime;

public class FileTimeReaderAlt {

    public static FileTime getCreationTimeAttribute(Path filePath) throws IOException {
        // "creationTime" 是标准的属性名称
        return (FileTime) Files.getAttribute(filePath, "creationTime");
    }

    public static void main(String[] args) {
        Path file = Paths.get("/usr/documents/archive/example.txt"); // 替换为实际文件路径
        try {
            FileTime creationTime = getCreationTimeAttribute(file);
            System.out.println("文件创建时间 (通过getAttribute): " + creationTime);
        } catch (IOException e) {
            System.err.println("无法读取文件属性: " + e.getMessage());
        }
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileTime;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class LatestFilesFinder {

    /**
     * 获取文件夹中按创建时间排序的最新N个文件。
     *
     * @param folderPath 文件夹路径
     * @param count      需要获取的文件数量
     * @return 最新N个文件的Path列表
     * @throws IOException 如果在文件操作中发生错误
     */
    public static List<Path> getLatestFilesByCreationTime(Path folderPath, int count) throws IOException {
        try (Stream<Path> files = Files.list(folderPath)) {
            return files
                    .filter(Files::isRegularFile) // 过滤掉目录，只处理普通文件
                    .map(file -> {
                        try {
                            BasicFileAttributes attr = Files.readAttributes(file, BasicFileAttributes.class);
                            return new FileWithCreationTime(file, attr.creationTime());
                        } catch (IOException e) {
                            System.err.println("读取文件属性失败: " + file + " - " + e.getMessage());
                            return null; // 忽略无法读取属性的文件
                        }
                    })
                    .filter(java.util.Objects::nonNull) // 过滤掉null值（即读取属性失败的文件）
                    .sorted(Comparator.comparing(FileWithCreationTime::getCreationTime).reversed()) // 按创建时间降序排序
                    .limit(count) // 取前N个
                    .map(FileWithCreationTime::getPath) // 提取文件路径
                    .collect(Collectors.toList());
        }
    }

    // 辅助类，用于存储文件路径和创建时间
    private static class FileWithCreationTime {
        private final Path path;
        private final FileTime creationTime;

        public FileWithCreationTime(Path path, FileTime creationTime) {
            this.path = path;
            this.creationTime = creationTime;
        }

        public Path getPath() {
            return path;
        }

        public FileTime getCreationTime() {
            return creationTime;
        }
    }

    public static void main(String[] args) {
        Path folder = Paths.get("/usr/documents/archive"); // 替换为实际文件夹路径
        int numberOfFiles = 50;

        try {
            List<Path> latestFiles = getLatestFilesByCreationTime(folder, numberOfFiles);
            System.out.println("最新创建的 " + latestFiles.size() + " 个文件:");
            latestFiles.forEach(System.out::println);
        } catch (IOException e) {
            System.err.println("获取最新文件失败: " + e.getMessage());
        }
    }
}