(Java) Backblaze S3 List Bucket Objects

See more Backblaze S3 Examples

Demonstrates how to list the objects in a bucket.

The Chilkat S3 functions in the HTTP class are compatible with the Backblaze service. However, because of some specific issues, Chilkat v9.5.0.89 or later is needed.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat HTTP API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // keyID = Access Key ID or Access Key
    http.put_AwsAccessKey("access-key");

    // applicationKey = Secret Access Key or Secret Key
    http.put_AwsSecretKey("secret-key");

    // Region is the 2nd part of your S3 Endpoint
    http.put_AwsEndpoint("s3.us-west-002.backblazeb2.com");

    String bucketName = "chilkat-test";

    String strXml = http.s3_ListBucketObjects(bucketName);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("Response status code = " + http.get_LastStatus());

    CkXml xml = new CkXml();
    boolean success = xml.LoadXml(strXml);
    if (success != true) {
        System.out.println(xml.lastErrorText());
        return;
        }

    // If the response status code was not 200, then the XML response is not a 
    // listing of objects, but instead contains error information.
    if (http.get_LastStatus() != 200) {
        System.out.println(xml.getXml());
        System.out.println("Failed.");
        return;
        }

    // A sample response is shown below.
    System.out.println(xml.getXml());
    System.out.println("----");

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Contents>
    //         <ETag>"303fb46cf341094fef6274b7789cd6aa"</ETag>
    //         <Key>orchard.json</Key>
    //         <LastModified>2021-10-30T14:45:52.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>22</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <Contents>
    //         <ETag>"a8551f0a5437f43a796fca7623ee9232"</ETag>
    //         <Key>seahorse.jpg</Key>
    //         <LastModified>2021-10-30T14:38:53.000Z</LastModified>
    //         <Owner>
    //             <ID>f2ebbc5f792c</ID>
    //             <DisplayName/>
    //         </Owner>
    //         <Size>24388</Size>
    //         <StorageClass>STANDARD</StorageClass>
    //     </Contents>
    //     <IsTruncated>false</IsTruncated>
    //     <MaxKeys>1000</MaxKeys>
    //     <Name>chilkat-test</Name>
    //     <Prefix/>
    //     <Marker/>
    // </ListBucketResult>

    String ETag;
    String Key;
    String LastModified;
    String ID;
    String SizeDecimalStr;
    String StorageClass;

    String ListBucketResult_xmlns = xml.getAttrValue("xmlns");
    int i = 0;
    int count_i = xml.NumChildrenHavingTag("Contents");
    while (i < count_i) {
        xml.put_I(i);
        ETag = xml.getChildContent("Contents[i]|ETag");
        Key = xml.getChildContent("Contents[i]|Key");
        LastModified = xml.getChildContent("Contents[i]|LastModified");
        ID = xml.getChildContent("Contents[i]|Owner|ID");
        SizeDecimalStr = xml.getChildContent("Contents[i]|Size");
        StorageClass = xml.getChildContent("Contents[i]|StorageClass");
        i = i+1;
        }

    String IsTruncated = xml.getChildContent("IsTruncated");
    int MaxKeys = xml.GetChildIntValue("MaxKeys");
    String Name = xml.getChildContent("Name");
  }
}