一个文件夹下有文件也有子文件夹，要求压缩并且原来的层级不变

如果要将文件夹及其子文件夹中的所有文件压缩到一个zip文件中，并保持原有的文件层级结构，可以使用以下代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class FolderCompressor {

    private static final int THREAD_POOL_SIZE = 5;

    public static void main(String[] args) {
        String sourceFolder = "/path/to/source/folder";
        String zipFile = "/path/to/output/zip/file.zip";

        compressFolder(sourceFolder, zipFile);
    }

    public static void compressFolder(String sourceFolder, String zipFile) {
        File folderToCompress = new File(sourceFolder);
        File zipOutputFile = new File(zipFile);

        if (!folderToCompress.exists()) {
            System.out.println("Source folder does not exist.");
            return;
        }

        try (ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(zipOutputFile))) {
            ExecutorService executorService = Executors.newFixedThreadPool(THREAD_POOL_SIZE);

            compressFolder(folderToCompress, "", zipOutputStream, executorService);

            executorService.shutdown();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void compressFolder(File file, String parentPath, ZipOutputStream zipOutputStream, ExecutorService executorService)
            throws IOException {
        if (file.isDirectory()) {
            String folderPath = parentPath + file.getName() + "/";
            ZipEntry zipEntry = new ZipEntry(folderPath);
            zipOutputStream.putNextEntry(zipEntry);
            zipOutputStream.closeEntry();

            for (File subFile : file.listFiles()) {
                compressFolder(subFile, folderPath, zipOutputStream, executorService);
            }
        } else {
            executorService.execute(() -> {
                try (FileInputStream fileInputStream = new FileInputStream(file)) {
                    ZipEntry zipEntry = new ZipEntry(parentPath + file.getName());
                    zipOutputStream.putNextEntry(zipEntry);

                    byte[] buffer = new byte[1024];
                    int length;
                    while ((length = fileInputStream.read(buffer)) > 0) {
                        zipOutputStream.write(buffer, 0, length);
                    }

                    zipOutputStream.closeEntry();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
        }
    }
}

请将`/path/to/source/folder`替换为要压缩的文件夹路径，并将`/path/to/output/zip/file.zip`替换为输出的压缩文件路径。该代码会递归遍历文件夹及其子文件夹，并将每个文件和子文件夹分别添加到zip文件中，保持原有的层级结构。使用线程池来并行处理文件和文件夹的压缩操作。