我试图从bytearrayoutputstream创建单独的文件（这里byteout是我的byteoutputstream）。下面的代码完成了这项工作

final InputStream targetStream = new ByteArrayInputStream(byteOut.toByteArray());
        final File destDir = new File(System.getProperty("user.dir"));
        final byte[] buffer = new byte[1024];
        ZipInputStream zis = new ZipInputStream(targetStream);
        ZipEntry zipEntry = zis.getNextEntry();
        while (zipEntry != null) {
            File newFile = new File(destDir, zipEntry.getName());
            FileOutputStream fos = new FileOutputStream(newFile);
            int len;
            while ((len = zis.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
            fos.close();
            zipEntry = zis.getNextEntry();
        }

但是我想优化代码，我试着像这样使用ioutils.copy

final InputStream targetStream = new ByteArrayInputStream(byteOut.toByteArray());
        final File destDir = new File(System.getProperty("user.dir"));
        ZipInputStream zis = new ZipInputStream(targetStream);
        ZipEntry zipEntry = zis.getNextEntry();
        while (zipEntry != null) {
            File newFile = new File(destDir, zipEntry.getName());
            try(InputStream is = new FileInputStream(newFile);
                    OutputStream fos = new FileOutputStream(newFile)) {
                IOUtils.copy(is, fos);
            }
            zipEntry = zis.getNextEntry();
        }

但是文件的内容没有被复制，在第二次迭代中我也得到了一个filenotfoundexception。我做错什么了？