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最近在项目中遇到一个问题：需要将上传的文件生成输出流，然后将输出流转换为输入流上传到oss。

-------------------------------------------导出代码实现----------------------------------------------------------

ByteArrayOutputStream baos = null;
try {// 查询导出 字段List<User> list = new ArrayList<>();User user=new User();user.setId(1);user.setName("张三");user.setAge("12");User user1=new User();user1.setId(2);user1.setName("李四");user1.setAge("22");baos = new ByteArrayOutputStream();// 自己本地 excel导出  将文件写入到baos 输出流中ExcelUtil.exportExcel(list, "导出信息", ProductDeviceVo.class, baos);//自己本地 阿里云OssClient storage = OssFactory.instance();// new ByteArrayInputStream(baos.toByteArray()) 将输出流转换为输入流UploadResult uploadResult = storage.uploadSuffix(new ByteArrayInputStream(baos.toByteArray()), ".xlsx", "application/vnd.ms-excel");if (null != uploadResult) {System.out.println(uploadResult);}
} catch (Exception e) {e.printStackTrace();
} finally {try {//关闭流if (null != baos) {baos.close();}} catch (Exception o) {o.printStackTrace();}
}

--------------------------------------------实体类---------------------------------------------------------

public class User{

        private String id;

        private  String name;

        private  String age;

}