workbook循环压缩，最后下载的压缩包只用最后循环的excel文件

问题遇到的现象和发生背景

workbook循环压缩，最后下载的压缩包只用最后循环的excel文件

问题相关代码，请勿粘贴截图

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ZipOutputStream zos = null;

    try {

        for (String name : workbooks.keySet()) {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            zos = new ZipOutputStream(byteArrayOutputStream);
            Workbook workbook = workbooks.get(name);
            ZipEntry entry = new ZipEntry(name);
            zos.putNextEntry(entry);
            workbook.write(bos);
            bos.writeTo(zos);
            zos.closeEntry();
            zos.close();
            bos.close();

        }

        byte[] bytes = byteArrayOutputStream.toByteArray();
        ByteArrayInputStream byteInputStream = new ByteArrayInputStream(bytes);