Java

Upload File in Blocks (with Content-MD5 header) and Commit the Block List

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Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block. Chilkat2 Java

import com.chilkatsoft.chilkat2.AuthAzureStorage;
import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.FileAccess;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.StringBuilder;
import com.chilkatsoft.chilkat2.Xml;

public class ChilkatExample {

    public static void main(String[] args) {
        // Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
        // See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx

        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Rest rest = new Rest();

        // Connect to the Azure Storage Blob Service
        boolean bTls = true;
        int port = 443;
        boolean bAutoReconnect = true;
        // In this example, the storage account name is "chilkat".
        try {
            rest.connect("chilkat.blob.core.windows.net", port, bTls, bAutoReconnect);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Provide Azure Cloud credentials for the REST call.
        AuthAzureStorage azAuth = new AuthAzureStorage();
        azAuth.setAccessKey("AZURE_ACCESS_KEY");
        // The account name used here should match the 1st part of the domain passed in the call to Connect (above).
        azAuth.setAccount("chilkat");
        azAuth.setScheme("SharedKey");
        azAuth.setService("Blob");
        // This causes the "x-ms-version: 2021-08-06" header to be automatically added.
        azAuth.setXMsVersion("2021-08-06");
        rest.setAuthAzureStorage(azAuth);

        // Note: The application does not need to explicitly set the following
        // headers: Content-Length, x-ms-date, Authorization.  These headers
        // are automatically set by Chilkat.

        // As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
        Xml xml = new Xml();
        xml.setTag("BlockList");

        // Any type of file can be uploaded in this way.  It can a text file, binary file, anything...
        // This example will upload an XML file that is approximately 275K in size.  It can be downloaded
        // at http://www.chilkatsoft.com/hamlet.xml
        FileAccess fac = new FileAccess();
        fac.openForRead("qa_data/xml/hamlet.xml");
        // Assuming success for the example..

        // We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
        // but this is just an example...)
        int blockSize = 16384;

        // How many 16K blocks?  (Including 1 for the last partial block)
        int numBlocks = fac.getNumBlocks(blockSize);

        Crypt2 crypt = new Crypt2();
        crypt.setHashAlgorithm("md5");

        StringBuilder sbResponseBody = new StringBuilder();
        StringBuilder uriPath = new StringBuilder();
        String blockId = "";
        BinData dataBlock = new BinData();
        String contentMd5 = "";
        int i = 0;
        while (i < numBlocks) {
            dataBlock.clear();
            try {
                fac.readBlockBd(i, blockSize, dataBlock);

                // Generate a base64 block ID.
                // (Chilkat provides a helper method named GenBlockId to make this easy)
                // A pre-base64 encoded block ID length of 4 is sufficient in this case because
                // this file certainly won't have more than 99,999 blocks..
                blockId = fac.genBlockId(i, 4, "base64");

                // Add this blockId to the list of blocks to be committed.
                xml.newChild2("Latest", blockId);

                // Build the URI path
                uriPath.clear();
                uriPath.append("/mycontainer/hamlet.xml?comp=block&blockId=");
                uriPath.append(blockId);

                contentMd5 = crypt.hashBdENC(dataBlock);
                rest.addHeader("Content-MD5", contentMd5);

                // Upload this block..
                sbResponseBody.clear();
                rest.fullRequestBd("PUT", uriPath.getAsString(), dataBlock, sbResponseBody);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
                return;
            }

            // Verify that we received a 201 status code.
            if (rest.getResponseStatusCode() != 201) {
                // Examine the request/response to see what happened.
                System.out.println("response status code = " + rest.getResponseStatusCode());
                System.out.println("response status text = " + rest.getResponseStatusText());
                System.out.println("response header: " + rest.getResponseHeader());
                System.out.println("response body (if any): " + sbResponseBody.getAsString());
                System.out.println("---");
                System.out.println("LastRequestStartLine: " + rest.getLastRequestStartLine());
                System.out.println("LastRequestHeader: " + rest.getLastRequestHeader());
                return;
            }

            i = i + 1;
        }

        fac.fileClose();

        // Now commit the blocks.
        // Let's have a look at the XML that will commit the blocks:
        String xmlStr = xml.getXml();
        System.out.println(xmlStr);

        // The XML will look like this:

        // <?xml version="1.0" encoding="utf-8" ?>
        // <BlockList>
        //     <Latest>MDAwMA==</Latest>
        //     <Latest>MDAwMQ==</Latest>
        //     <Latest>MDAwMg==</Latest>
        //     <Latest>MDAwMw==</Latest>
        //     <Latest>MDAwNA==</Latest>
        //     <Latest>MDAwNQ==</Latest>
        //     <Latest>MDAwNg==</Latest>
        //     <Latest>MDAwNw==</Latest>
        //     <Latest>MDAwOA==</Latest>
        //     <Latest>MDAwOQ==</Latest>
        //     <Latest>MDAxMA==</Latest>
        //     <Latest>MDAxMQ==</Latest>
        //     <Latest>MDAxMg==</Latest>
        //     <Latest>MDAxMw==</Latest>
        //     <Latest>MDAxNA==</Latest>
        //     <Latest>MDAxNQ==</Latest>
        //     <Latest>MDAxNg==</Latest>
        //     <Latest>MDAxNw==</Latest>
        // </BlockList>

        // --------------------------------------------------------------------------
        // IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
        // --------------------------------------------------------------------------
        rest.removeHeader("Content-MD5");

        // Send the PUT Block List...
        String responseStr;
        try {
            responseStr = rest.fullRequestString("PUT", "/mycontainer/hamlet.xml?comp=blocklist", xmlStr);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // When successful, the Azure Storage service will respond with a 201 response status code,
        // with no response body.

        if (rest.getResponseStatusCode() != 201) {
            // Examine the request/response to see what happened.
            System.out.println("response status code = " + rest.getResponseStatusCode());
            System.out.println("response status text = " + rest.getResponseStatusText());
            System.out.println("response header: " + rest.getResponseHeader());
            System.out.println("response body (if any): " + responseStr);
            System.out.println("---");
            System.out.println("LastRequestStartLine: " + rest.getLastRequestStartLine());
            System.out.println("LastRequestHeader: " + rest.getLastRequestHeader());
            return;
        }

        System.out.println("Success.");
    }
}