java - 在 Java 8 中，如何从 InputStream 转换为字节数组，并一路用 zip 压缩流？

Question

换句话说，我有:

InputStream inputStream = getInputStreamFromSource();
byte[] output = zipOutputStreamAndConvertToByteArray(inputStream);

如何实现zipOutputStreamAndConvertToByteArray函数？

private byte[] zipOutputStreamAndConvertToByteArray(InputStream inputStream)
{
    // what code goes here?
}

Answer 1

这将创建一个名为 file 的 zip 文件:

private static byte[] zipOutputStreamAndConvertToByteArray(InputStream inputStream) throws IOException {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    try (ZipOutputStream zip = new ZipOutputStream(outputStream)) {
        zip.putNextEntry(new ZipEntry("file"));
        try (InputStream in = inputStream) { 
        // this try block can be replaced with IOUtils.copy or ByteStreams.copy
            byte[] buffer = new byte[4096];
            int len;
            while ((len = in.read(buffer)) > 0) {
                zip.write(buffer, 0, len);
            }
        }
        zip.closeEntry();
    }

    return outputStream.toByteArray();
}