将 zip 文件编码为 Base64 而不在文件系统上写入 zip [英] encode zip file to Base64 without write zip on filesystem

问题描述

出于我的目的，我想压缩 zip 文件夹中的一些文件.然后必须对 zip 文件进行 Base64 编码.如果不在文件系统上写入 zip 文件，我该怎么做?

For my purpose, I want to compress some file in zip folder. Then the zip file has to be encoded Base64. How can I do that without write zip file on filesystem?

private static String zipB64(List<File> files) throws FileNotFoundException, IOException {

    String encodedBase64 = null;
    String zipFile = C_ARCHIVE_ZIP;
    byte[] buffer = new byte[1024];

    try (FileOutputStream fos = new FileOutputStream(zipFile); ZipOutputStream zos = new ZipOutputStream(fos);) {

        for (File f : files) {

            FileInputStream fis = new FileInputStream(f);
            zos.putNextEntry(new ZipEntry(f.getName()));
            int length;
            while ((length = fis.read(buffer)) > 0) {
                zos.write(buffer, 0, length);
            }
            zos.closeEntry();
        }
    }
    File originalFile = new File(C_ARCHIVE_ZIP);
    byte[] bytes = new byte[(int)originalFile.length()];
    encodedBase64 = Base64.getEncoder().encodeToString(bytes);
    return encodedBase64;
}

推荐答案

Stephen C 答案的测试和编译版本:

Tested and compiled version of Stephen C's answer:

private static String zipB64(List<File> files) throws IOException {
    byte[] buffer = new byte[1024];
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try (ZipOutputStream zos = new ZipOutputStream(baos)) {
        for (File f : files) {
            try (FileInputStream fis = new FileInputStream(f)) {
                zos.putNextEntry(new ZipEntry(f.getName()));
                int length;
                while ((length = fis.read(buffer)) > 0) {
                    zos.write(buffer, 0, length);
                }
                zos.closeEntry();
            }
        }
    }
    byte[] bytes = baos.toByteArray();
    return Base64.getEncoder().encodeToString(bytes);
}

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