Question

我是Azure新手，我正在尝试使用REST API将图像上传到Azure blob，但无法找到任何使用Java解释过程的参考/材料，我发现使用c＃的示例但我想使用Java实现功能

Answer 1

我意识到你正在询问如何使用REST API进行blob（完全记录here）。但是：鉴于在REST API上面构建了一个Java SDK，除非你需要一些在SDK中没有实现的特定功能，否则你应该真正看看它。即使在这种情况下，也欢迎您更新SDK并将更改提交回Azure团队，因为SDK源位于github。

以下是使用Java SDK处理blob的documentation，以下是包含Java的特定于语言的SDK的download links。

Answer 2

Windows Azure SDK for Java调用REST API，为什么不使用Java SDK？ http://www.windowsazure.com/en-us/develop/java/how-to-guides/blob-storage/#UploadBlob

Answer 3

@VJD我已经编写了一些使用Java API的指导文档，以及示例Java代码。这应该在第二天左右在MSDN上发布。一旦它上线，我会在这里发布一个链接。以下是整个内容的链接。

Controlling Access to Windows Azure Blob Containers with Java

Controlling Access to Windows Azure Queues with Java

Controlling Access to Windows Azure Tables with Java

您可以通过多种方式控制存储帐户中blob容器的访问权限，但使用存储的访问策略可能是最灵活的。这使您可以在不泄露秘密存储帐户密钥的情况下临时访问客户端，并使您能够取消，扩展或更新访问类型，而无需重新分发基本SAS字符串。

例如，您的应用程序可以使用类似于以下内容的Java代码为容器生成存储的访问策略签名。

public class PolicySAS
{
  public static void main(String[] args) throws InvalidKeyException, 
     URISyntaxException, StorageException 
  {
  Account creds = new Account();     //Account key required to create SAS           
  final String storageConnectionString = creds.getstorageconnectionstring();
  CloudStorageAccount storageAccount = 
     CloudStorageAccount.parse(storageConnectionString);
  CloudBlobClient blobClient = storageAccount.createCloudBlobClient();
  CloudBlobContainer container = blobClient.getContainerReference("container1");
  container.createIfNotExist();
  SharedAccessBlobPolicy policy = new SharedAccessBlobPolicy();
  GregorianCalendar calendar = 
     new GregorianCalendar(TimeZone.getTimeZone("UTC"));
  calendar.setTime(new Date());
  policy.setSharedAccessStartTime(calendar.getTime()); //Immediately applicable
  calendar.add(Calendar.HOUR, 3); //Applicable time-span is 3 hours
  policy.setSharedAccessExpiryTime(calendar.getTime());           
  policy.setPermissions(EnumSet.of(SharedAccessBlobPermissions.READ, 
     SharedAccessBlobPermissions.WRITE, SharedAccessBlobPermissions.DELETE, 
     SharedAccessBlobPermissions.LIST));
  BlobContainerPermissions containerPermissions = new BlobContainerPermissions();
  //Private container with no access for anonymous users
  containerPermissions.setPublicAccess(BlobContainerPublicAccessType.OFF);
  //Name the shared access policy: heath
  containerPermissions.getSharedAccessPolicies().put("heath", policy);
  container.uploadPermissions(containerPermissions);
  //Generate the policy SAS string for heath access
  String sas = container.generateSharedAccessSignature(
     new SharedAccessBlobPolicy(),"heath");           
  System.out.println("The stored access policy signature:");
  System.out.println(sas);
  }         
}

客户端可以使用与此类似的类来上传带元数据的blob。

public class SASblober 
{
   public static void main(String[] args) throws URISyntaxException, 
      FileNotFoundException, StorageException, IOException 
   {                        
   //This does not reveal the secret storage account key
   URI baseuri = new URI("http://grassy.blob.core.windows.net");
   CloudBlobClient blobclient = new CloudBlobClient(baseuri);
   MyUploadBlob("container1",
     "sr=c&sv=2012-02-12&sig=nnPn5P5nnPPnn5Pnn5PPnPPPnPPP5PPPPPP%5PPnn5PPn%55&si=heath",
      blobclient);          
   }

   public static void MyUploadBlob(String containerName, String containerSAS, 
      CloudBlobClient blobClient) throws URISyntaxException, StorageException, 
      FileNotFoundException, IOException
   {    
   //Uploads a local file to blob-container in cloud
   String blobName = "image3.jpg";  
   String localFileName = "c:\\myimages\\image3.jpg";  
   URI uri = new URI(blobClient.getEndpoint().toString() + "/" +
     containerName + "/" + 
     blobName + 
     "?" + 
     containerSAS);
   CloudBlockBlob sasBlob = new CloudBlockBlob(uri, blobClient);
   HashMap<String, String> user = new HashMap<String, String>();    
   user.put("firstname", "Joe");
   user.put("lastname", "Brown" );
   user.put("age", "28");
   user.put("presenter", "no");  
   sasBlob.setMetadata(user);
   File fileReference = new File(localFileName);
   sasBlob.upload(new FileInputStream(fileReference), fileReference.length());
   System.out.println("The blob: " + blobName + " has been uploaded to:");
   System.out.println(uri);
   }
}

客户端可以使用与此类似的类来读取blob。

public class SASread 
{
   public static void main(String[] args) throws URISyntaxException, 
      FileNotFoundException, StorageException, IOException 
   {                        
   URI baseuri = new URI("http://grassy.blob.core.windows.net");
   CloudBlobClient blobclient = new CloudBlobClient(baseuri);
   MyDownloadBlob("container1",
     "sr=c&sv=2012-02-12&sig=nnPn5P5nnPPnn5Pnn5PPnPPPnPPP5PPPPPP%5PPnn5PPn%55&si=heath",
       blobclient);         
    }

   public static void MyDownloadBlob(String containerName, String containerSAS, 
      CloudBlobClient blobClient) throws URISyntaxException, StorageException, 
      FileNotFoundException, IOException
   {
   //   Downloads blob in cloud to local file
   String blobName = "image3.jpg";  
   String localFileName = "c:\\myoutputimages\\image3.jpg";  
   URI uri = new URI(blobClient.getEndpoint().toString() + "/" + containerName 
      + "/" + blobName + "?" + containerSAS);   
   CloudBlockBlob sasBlob = new CloudBlockBlob(uri, blobClient);    
   File fileTarget = new File(localFileName); 
   sasBlob.download(new FileOutputStream(fileTarget));   
   HashMap<String, String> user = new HashMap<String, String>();    
   user = sasBlob.getMetadata();    
   String name = (user.get("firstname") + " " + user.get("lastname"));
   String age = ("age: " + user.get("age"));
   String present = ("Presenting talk? " + user.get("presenter"));
   System.out.println(name);
   System.out.println(age);
   System.out.println(present);
   System.out.println("The blob at:\n"  + uri 
      + "\nwas downloaded from the cloud to local file:\n" + localFileName);    
   }
}

如何在Java blob存储中使用REST API

3 个答案: