如何获取Azure Storage Blob的MD5值

问题表述

直接使用CloudBlockBlob对象获取的Properties是空的,无法获取到对象的MD5值,后台并未进行属性值的填充

前提:blob属性本省包含md5值,某些方式上传的blob默认并没有md5值

解决办法

方法一:使用FetchAttributes()填充blob的属性值和元数据

方法二:使用List方法遍历container中的对象,通过对象的属性获取MD5

Code Demo

方法一:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse("<storage connection string>");//storage connection string

CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

CloudBlobContainer container = blobClient.GetContainerReference("hello");//container name

//Retrieve reference to a blob named "myblob".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("tt.txt"); blockBlob.FetchAttributes();//填充blob的属性值和元数据 string md5 = blockBlob.Properties.ContentMD5; Console.WriteLine("md5:" + md5);

方法二:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse("<storage connection string>");//storage connection string

CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

CloudBlobContainer container = blobClient.GetContainerReference("hello");//container name

 foreach (IListBlobItem item in container.ListBlobs(null, false))
{
if (item.GetType() == typeof(CloudBlockBlob))
{
CloudBlockBlob blob = (CloudBlockBlob)item; Console.WriteLine("Block blob of length {0}: {1} + md5:{2}.", blob.Properties.Length, blob.Uri, blob.Properties.ContentMD5);//获取md5值 }
else if (item.GetType() == typeof(CloudPageBlob))
{
CloudPageBlob pageBlob = (CloudPageBlob)item; Console.WriteLine("Page blob of length {0}: {1}", pageBlob.Properties.Length, pageBlob.Uri); }
else if (item.GetType() == typeof(CloudBlobDirectory))
{
CloudBlobDirectory directory = (CloudBlobDirectory)item; Console.WriteLine("Directory: {0}", directory.Uri);
}
}

相关信息参考链接

通过 .NET 开始使用 Azure Blob 存储

Windows Azure Blob MD5 Overview

Blob Service REST API

上一篇:JAVAEE——宜立方商城01:电商行业的背景、商城系统架构、后台工程搭建、SSM框架整合


下一篇:BASH 正则表达式和文本处理工具