base64转pdf

public static void base64StringToPdf(String base64Content, String filePath) {
    BASE64Decoder decoder = new BASE64Decoder();
    byte[] bytes;
    try {
        bytes = decoder.decodeBuffer(base64Content);// base64编码内容转换为字节数组
    } catch (IOException e) {
        throw new BusinessRuntimeException("base64转换pdf失败：base64转换为字节数组失败");
    }
    File file = new File(filePath);
    File path = file.getParentFile();
    if (!path.exists()) {
        boolean b = path.mkdirs();
        if (!b) {
            throw new BusinessRuntimeException("base64转换pdf失败：创建文件失败");
        }
    }
    try (
            ByteArrayInputStream byteInputStream = new ByteArrayInputStream(bytes);
            BufferedInputStream bis = new BufferedInputStream(byteInputStream);
            FileOutputStream fos = new FileOutputStream(file);
            BufferedOutputStream bos = new BufferedOutputStream(fos);
    ) {
        byte[] buffer = new byte[1024];
        int length = bis.read(buffer);
        while (length != -1) {
            bos.write(buffer, 0, length);
            length = bis.read(buffer);
        }
        bos.flush();
    } catch (Exception e) {
        e.printStackTrace();
    }
}