Question

我正在尝试使用azure storage rest api推送块blob类型，但是问题是有关内容长度，以便在上传之前先知道。

对于在没有可用长度信息的情况下需要中继inputStream的情况，我们是否有解决方法？

String accesskey = "accesskey";
String storageAccount = "storageAccount";
String containerName = "containerName";
String workgroupId = UUID.randomUUID().toString();
String objectId = "1." + UUID.randomUUID().toString();
String blobName = getAzureAccessKey(containerName, workgroupId, objectId);
String version = "2018-03-28";
String putData = "testData";

SimpleDateFormat fmt = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss");
fmt.setTimeZone(TimeZone.getTimeZone("GMT"));
String currentDate = fmt.format(Calendar.getInstance().getTime()) + " GMT";

String urlResource = "/"+ Paths.get(storageAccount, containerName, blobName).toString();
String headerResource = "x-ms-blob-type:BlockBlob\nx-ms-date:" + currentDate + "\nx-ms-version:" + version;
String putUrl = "https://" + storageAccount + ".blob.core.windows.net/" + containerName + "/" + blobName;
System.out.println(putUrl);
String newline = "\n";

List listToSign = Lists.newArrayList();
listToSign.add("PUT");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add("application/octet-stream");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add("");
listToSign.add(headerResource);
listToSign.add(urlResource);

String stringToSign = String.join(newline, listToSign);
 Base64 base64 = new Base64();


System.out.println(stringToSign);
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(new SecretKeySpec(base64.decode(accesskey), "HmacSHA256"));
String authKey = new String(base64.encode(mac.doFinal(stringToSign.getBytes("UTF-8"))));

String authHeader =  "SharedKey " + storageAccount + ":"+ authKey;

System.out.println(authHeader);

InputStreamEntity entity = new InputStreamEntity(
        new ByteArrayInputStream(putData.getBytes(StandardCharsets.UTF_8)), -1,
        ContentType.APPLICATION_OCTET_STREAM);

// set chunked transfer encoding ie. no Content-length
entity.setChunked(true);
HttpPut httpPut = null;
try {

    DefaultHttpClient httpClient =  new DefaultHttpClient();
    httpClient.removeRequestInterceptorByClass(org.apache.http.protocol.RequestContent.class);

    httpPut = new HttpPut(putUrl);
    httpPut.setHeader("Host", storageAccount + ".blob.core.windows.net");
    httpPut.setHeader("Transfer-Encoding","chunked");
    //httpPut.setHeader("Content-Length","0");
    httpPut.setHeader("Content-Type","application/octet-stream");
    httpPut.addHeader("x-ms-blob-type", "BlockBlob");
    httpPut.addHeader("x-ms-date", currentDate);
    httpPut.addHeader("x-ms-version", version);
    httpPut.addHeader("Authorization",authHeader);


    httpPut.setEntity(entity);

    System.out.println("Request Headers");

    for (Header header : httpPut.getAllHeaders()) {
        System.out.println(header.getName() + ":" + header.getValue());
    }
    HttpResponse response = httpClient.execute(httpPut);
    System.out.println(response.getStatusLine());


    for (Header header: response.getAllHeaders()) {
        System.out.println(header.getName()+":"+ header.getValue());
    }
    // Read the contents of an entity and return it as a String.
    String content = EntityUtils.toString(response.getEntity());
    System.out.println(content);

} finally {

    if(httpPut != null ){
        httpPut.releaseConnection();
    }
}

来自服务器的响应

HTTP Error 400. There is an invalid content length or chunk length in the request.

如果我将内容长度设置为签名和标头信息的一部分，则上述代码有效。

Answer 1

我们可以使用ByteArrayEntity来获取内容长度，而不是使用InputStreamEntity

这是一个简单的演示供您参考：

        FileInputStream fileInputStream=null;
        ByteArrayOutputStream bos = null ;
        try {
            fileInputStream=new FileInputStream("D:/Test/Test.txt");
            bos = new ByteArrayOutputStream();
            byte[] bytes=new byte[102400];
            int x=0;
            while ((x=fileInputStream.read(bytes))!= -1){
                bos.write(bytes,0,x);
            }
            byte[] data = bos.toByteArray();

            org.apache.http.entity.ByteArrayEntity byteArrayEntity=new ByteArrayEntity(data);
            int contentLength=data.length;

        } catch (Exception e) {
            e.printStackTrace();
        }

正如陆肇星所说，我们可以使用Java SDK来实现这一目标，下面是使用Java SDK的示例供您参考：

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.net.URISyntaxException;
import java.security.InvalidKeyException;
import com.microsoft.azure.storage.CloudStorageAccount;
import com.microsoft.azure.storage.blob.CloudBlobClient;
import com.microsoft.azure.storage.blob.CloudBlobContainer;
import com.microsoft.azure.storage.blob.CloudBlockBlob;
import com.microsoft.azure.storage.blob.ListBlobItem;

public class Main {

     public static final String ConnString="DefaultEndpointsProtocol=https;AccountName=xxxxxxxxb;AccountKey=O7xxxx8e86XQSy2vkvSi/x/e9l9FhLqxxxxjkly1DsQPYY5dF2JrAVxxxxo29ZrrGJA==;EndpointSuffix=core.windows.net";
    public static void main(String[] args) {
        // TODO Auto-generated method stub      
        uploadBlob("mycontainer","TechTalk.pptx","E:\\Test\\TechTalk.pptx");
        System.out.println("Success");

    }

    public static void uploadBlob(String containerName, String blobName,String filePath) {
        CloudStorageAccount account = null;
        CloudBlobContainer container = null;
        try {
            account = CloudStorageAccount.parse(ConnString);
            CloudBlobClient client = account.createCloudBlobClient();
            container = client.getContainerReference(containerName);
            container.createIfNotExists();
            CloudBlockBlob cloudBlockBlob = container.getBlockBlobReference(blobName);
            FileInputStream fileinputStream=new FileInputStream(filePath);
            cloudBlockBlob.upload(fileinputStream, fileinputStream.available());
        }catch(Exception ex) {
            ex.printStackTrace();
        }
    }
}

我们可以通过以下网址获取Java SDK：Java SDK

用于块Blob的Azure存储服务REST API：内容长度问题

1 个答案: