Java 中压缩文件夹几种方式对比

废话少说，直接上代码和结果图.

main函数执行方法 如下 :

public static void compareZipSpeed() {

        String srcDir = "D:\\Documents\\Desktop\\testZipSpeed\\testDir";
        ZipFileUtil z3 = new ZipFileUtil();
        try {
            z3.test(srcDir, "D:\\Documents\\Desktop\\testZipSpeed\\zip_file.zip");
        } catch (IOException e) {
            e.printStackTrace();
        }

        ZipNioUtil z4 = new ZipNioUtil();
        try {
            z4.test(srcDir, "D:\\Documents\\Desktop\\testZipSpeed\\zip_nio.zip", true);
        } catch (Exception e) {
            e.printStackTrace();
        }

        ZipStreamUtil z1 = new ZipStreamUtil();
        try {
            z1.test(srcDir, "D:\\Documents\\Desktop\\testZipSpeed\\zip_stream.zip");
        } catch (IOException e) {
            e.printStackTrace();
        }
}

下面是3个 压缩文件夹的 Util 工具类 :

1. zipFile 压缩方式

class ZipFileUtil {
    public void test(String srcDir, String destFile) throws IOException {
        long start = System.currentTimeMillis();
        File rootFile = autoCreateDir(new File(srcDir),false);
        var zipPath = destFile;
        var zip = new ZipFile(zipPath);
        zip.setCharset(Charset.forName("UTF-8"));
        try {
            zip.addFolder(rootFile);
            zip.close();
        } catch (ZipException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        long end = System.currentTimeMillis();
        System.out.println(this.getClass().getName() + "  -> finish . cost:" + (end - start) + "ms");
    }
}

2. zipNio 压缩方式

class ZipNioUtil {
    public void test(String srcDir, String destFile, boolean ifAllowReWrite) throws IOException {
        if (new File(destFile).exists()) {
            if (ifAllowReWrite) {
                new File(destFile).delete();
            } else {
                throw new RuntimeException("此压缩目标文件路径--文件已存在!");
            }
        }
        autoCreateDir( new File(destFile),false );

        long start = System.currentTimeMillis();
        ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(destFile)));
        WritableByteChannel writableByteChannel = Channels.newChannel(zos);
        addFolderToZip(srcDir, srcDir, zos, writableByteChannel);
        zos.close();
        long end = System.currentTimeMillis();
        System.out.println(this.getClass().getName() + "  -> finish . cost:" + (end - start) + "ms");
    }

    private static void addFolderToZip(String folderPath, String srcDir, ZipOutputStream zos, WritableByteChannel writableByteChannel) throws IOException {
        File folder = new File(folderPath);
        if (folder != null && folder.exists() && folder.isDirectory()) {
            File[] files = folder.listFiles();
            if (files != null && files.length > 0) {
                for (File file : files) {
                    if (file != null && file.exists()) {
                        if (file.isDirectory()) {
                            addFolderToZip(file.getAbsolutePath(), srcDir, zos, writableByteChannel);
                        } else {
                            String fileName = file.getAbsolutePath().substring(srcDir.length() + 1);
                            ZipEntry zipEntry = new ZipEntry(fileName);
                            zos.putNextEntry(zipEntry);
                            //读取待压缩的文件并写进压缩包里
                            FileInputStream fis = new FileInputStream(file);
                            FileChannel fileChannel = fis.getChannel();
                            fileChannel.transferTo(0, file.length() - 1, writableByteChannel);
                        }
                    }
                }
            }
        }
    }
}

3. ZipOutputStream 压缩方式

class ZipStreamUtil {
    public void test(String srcDir, String destFile) throws IOException {
        long start = System.currentTimeMillis();
        String sourceFolder = srcDir;
        String zipFile = destFile;
        autoCreateDir(new File(zipFile),false);
        FileOutputStream fos = new FileOutputStream(zipFile);
        ZipOutputStream zos = new ZipOutputStream(fos);
        BufferedOutputStream bos = new BufferedOutputStream(zos);

        addFolderToZip(sourceFolder, sourceFolder, zos, bos);

        bos.close();
        zos.close();
        fos.close();
        long end = System.currentTimeMillis();
        System.out.println(this.getClass().getName() + "  -> finish . cost:" + (end - start) + "ms");
    }

    private static void addFolderToZip(String folderPath, String sourceFolder, ZipOutputStream zos, BufferedOutputStream bos) throws IOException {
        File folder = new File(folderPath);
        File[] files = folder.listFiles();
        if (files != null && files.length > 0) for (File file : files) {
            if (file.isDirectory()) {
                addFolderToZip(file.getAbsolutePath(), sourceFolder, zos, bos);
            } else {
                String filePath = file.getAbsolutePath().substring(sourceFolder.length() + 1);
                ZipEntry zipEntry = new ZipEntry(filePath);
                zos.putNextEntry(zipEntry);
                FileInputStream fis = new FileInputStream(file);
                BufferedInputStream bis = new BufferedInputStream(fis);

                byte[] buffer = new byte[102400];
                int length;
                while ((length = bis.read(buffer)) > 0) {
                    bos.write(buffer, 0, length);
                }
                bos.flush();
                bis.close();
                fis.close();
            }
        }
    }
}

三种压缩方式 速度对比:

总结，经过对比，由于 ZipNio 使用了 FileChannel ，速度更快一些。想了解底层原理的同学也可以去研究下其中的源码