[Azure Storage]使用Java上传文件到Storage并生成SAS签名
Azure官网提供了比较详细的文档，您可以参考：https://azure.microsoft.com/en-us/documentation/articles/storage-java-how-to-use-blob-storage/#download-a-blob
或者，请参考下面的步骤：
- 下载Azure SDK for Java，地址为：https://azure.microsoft.com/en-us/documentation/articles/java-download-azure-sdk/
- 将Azure SDK for Java的jar包导入到项目中
- 参考本文最后附加的代码
代码说明如下：
- 本人不是Java方面的专家，因而代码的规范性上或许不如你专业，你可以酌情调整。此外，代码仅作测试用，请勿用于生产环境
- 测试附件中的代码的时候，需要在代码中替换你的：存储帐号名称、存储帐号密钥、容器名称、视频路径，如下图所示：
- 附加的代码中，提供了两个方法，UploadSmallSize和UploadLargeSize用于视频是上传。对于大文件（超过100M），需要先将文件分片而后上传。这种情况下，请使用UploadLargeSize。
- GetBlobUrl – 这个方法是用于返回Blob的URL。由于Blob在默认情况下无法直接通过URL访问，我们在这个方法中为Blob添加了SAS签名对Blob设置了权限，使得在一定时间范围内是可以访问的。关于SAS的更多内容，您可以参考：https://azure.microsoft.com/en-us/documentation/articles/storage-dotnet-shared-access-signature-part-2/
1 import java.io.ByteArrayInputStream; 2 import java.io.File; 3 import java.io.FileInputStream; 4 import java.io.FileNotFoundException; 5 import java.io.IOException; 6 import java.net.URISyntaxException; 7 import java.security.InvalidKeyException; 8 import java.security.KeyManagementException; 9 import java.security.NoSuchAlgorithmException; 10 import java.security.SecureRandom; 11 import java.security.cert.X509Certificate; 12 import java.util.ArrayList; 13 import java.util.Calendar; 14 import java.util.Date; 15 import java.util.EnumSet; 16 import java.util.GregorianCalendar; 17 import java.util.Random; 18 import java.util.TimeZone; 19 20 import javax.net.ssl.*; 21 22 import com.microsoft.azure.storage.CloudStorageAccount; 23 import com.microsoft.azure.storage.StorageCredentials; 24 import com.microsoft.azure.storage.StorageCredentialsAccountAndKey; 25 import com.microsoft.azure.storage.StorageException; 26 import com.microsoft.azure.storage.blob.BlobContainerPermissions; 27 import com.microsoft.azure.storage.blob.BlobContainerPublicAccessType; 28 import com.microsoft.azure.storage.blob.BlockEntry; 29 import com.microsoft.azure.storage.blob.BlockSearchMode; 30 import com.microsoft.azure.storage.blob.CloudBlobClient; 31 import com.microsoft.azure.storage.blob.CloudBlobContainer; 32 import com.microsoft.azure.storage.blob.CloudBlockBlob; 33 import com.microsoft.azure.storage.blob.SharedAccessBlobPermissions; 34 import com.microsoft.azure.storage.blob.SharedAccessBlobPolicy; 35 36 37 public class JavaStorageClient { 38 39 static final String storageAccountName = "<Storage Account>"; 40 static final String storageAccountKey = "<Storage Key>"; 41 static final String containerName = "<Container Name>"; 42 static final String videoPath = "<>"; 43 //static final String videoPath = "D:\\Training\\all hands meeting-1.mp4"; 44 45 static CloudStorageAccount storageAccount = null; 46 47 private static void Init() throws InvalidKeyException, URISyntaxException, NoSuchAlgorithmException, KeyManagementException{ 48 TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager(){public X509Certificate[] getAcceptedIssuers(){return null;} 49 public void checkClientTrusted(X509Certificate[] certs, String authType){} 50 public void checkServerTrusted(X509Certificate[] certs, String authType){}}}; 51 SSLContext sc = SSLContext.getInstance("TLS"); 52 sc.init(null, trustAllCerts, new SecureRandom()); 53 HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); 54 55 56 StorageCredentials credentials = new StorageCredentialsAccountAndKey(storageAccountName, storageAccountKey); 57 String connectionString = String.format("DefaultEndpointsProtocol=https;AccountName=%s;AccountKey=%s;EndpointSuffix=core.Chinacloudapi.cn", storageAccountName, storageAccountKey); 58 storageAccount = CloudStorageAccount.parse(connectionString); 59 60 } 61 62 private static CloudBlobContainer GetContainer() throws URISyntaxException, StorageException{ 63 CloudBlobClient blobClient = storageAccount.createCloudBlobClient(); 64 CloudBlobContainer container; 65 container = blobClient.getContainerReference(containerName); 66 container.createIfNotExists(); 67 68 return container; 69 } 70 71 // For small size video, we can use this method. 72 private static void UploadSmallSize() throws URISyntaxException, StorageException, FileNotFoundException, IOException, InvalidKeyException{ 73 System.out.println("===============Begin Uploading==============="); 74 File source = new File(videoPath); 75 String blobName = source.getName(); 76 CloudBlobContainer container = GetContainer(); 77 CloudBlockBlob blob = container.getBlockBlobReference(source .getName()); 78 79 blob.upload(new FileInputStream(source), source.length()); 80 System.out.println("===============Uploading Done==============="); 81 System.out.println("Blob URL: " + GetBlobUrl(container, blobName)); 82 } 83 84 85 private static void UploadLargeSize() throws URISyntaxException, StorageException, IOException, InvalidKeyException{ 86 File source = new File(videoPath); 87 String blobName = source.getName(); 88 FileInputStream inputStream = new FileInputStream(source); 89 final int blockLength = 1 * 1024*1024; 90 byte[] bufferBytes = new byte[blockLength]; 91 int blockCount = (int)(source.length() / blockLength) + 1; 92 System.out.println("Total block count："+blockCount+", Total size: "+source.length()); 93 int currentBlockSize = 0; 94 95 CloudBlobContainer container = GetContainer(); 96 CloudBlockBlob blockBlobRef = container.getBlockBlobReference(blobName); 97 98 System.out.println("===============Begin Uploading==============="); 99 ArrayList<BlockEntry> blockList = new ArrayList<BlockEntry>(); 100 101 for (int i = 0; i < blockCount; i++) { 102 //String blockID="OWM3MDhiMWEtODdhNS00YjE5LWE2NmEtYzAzMGJmZWIyYzli";//String.format("%09d", i); 103 //blockID=getBASE64(blockID);//Base64.encode(blockID.getBytes()); 104 //String blockID="b"+String.valueOf(id); 105 //String blockID =Base64.encode(sid.getBytes()); 106 //String.format("%08d", String.valueOf(10000+i));//String.valueOf(1000000+i);// Base64.encode(String.valueOf(1000000+i).getBytes()); 107 String blockID = String.format("%08d", i); 108 currentBlockSize = blockLength; 109 if (i == blockCount - 1){ 110 currentBlockSize = (int) (source.length() - blockLength * i); 111 bufferBytes = new byte[currentBlockSize]; 112 } 113 114 inputStream.read(bufferBytes, 0, currentBlockSize); 115 blockBlobRef.uploadBlock(blockID, getRandomDataStream(blockLength), blockLength, null, null, null); 116 blockList.add(new BlockEntry(blockID, BlockSearchMode.LATEST)); 117 System.out.println("Submitted block index：" + i + ", BlockIndex:" + blockID); 118 } 119 blockBlobRef.commitBlockList(blockList); 120 System.out.println("===============Uploading Done==============="); 121 122 123 System.out.println("Blob URL: " + GetBlobUrl(container, blobName)); 124 } 125 126 private static byte[] getRandomBuffer(int length) { 127 final Random randGenerator = new Random(); 128 final byte[] buff = new byte[length]; 129 randGenerator.nextBytes(buff); 130 return buff; 131 } 132 133 134 private static ByteArrayInputStream getRandomDataStream(int length) { 135 return new ByteArrayInputStream(getRandomBuffer(length)); 136 } 137 138 private static String GetBlobUrl(CloudBlobContainer container, String blobName) throws StorageException, InvalidKeyException, URISyntaxException{ 139 SharedAccessBlobPolicy policy = new SharedAccessBlobPolicy(); 140 GregorianCalendar calendar = new GregorianCalendar(TimeZone.getTimeZone("UTC")); 141 calendar.setTime(new Date()); 142 143 // Immediately applicable 144 policy.setSharedAccessStartTime(calendar.getTime()); 145 146 // Applicable time span is 1 hour 147 calendar.add(Calendar.HOUR, 1); 148 policy.setSharedAccessExpiryTime(calendar.getTime()); 149 150 // SAS grants READ access privileges 151 policy.setPermissions(EnumSet.of(SharedAccessBlobPermissions.READ)); 152 BlobContainerPermissions containerPermissions = new BlobContainerPermissions(); 153 154 // Private blob-container with no access for anonymous users 155 containerPermissions.setPublicAccess(BlobContainerPublicAccessType.OFF); 156 container.uploadPermissions(containerPermissions); 157 String sas = container.generateSharedAccessSignature(policy,null); 158 159 CloudBlockBlob blob = container.getBlockBlobReference(blobName); 160 String blobUri = blob.getUri().toString(); 161 162 return blobUri + "?"+ sas; 163 } 164 165 public static void main(String[] args) throws FileNotFoundException, URISyntaxException, StorageException, IOException, InvalidKeyException, KeyManagementException, NoSuchAlgorithmException { 166 // TODO Auto-generated method stub 167 Init(); 168 //UploadLargeSize(); 169 UploadSmallSize(); 170 } 171 172 }
