Java

S3 Get Bucket Objects with CommonPrefixes

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Demonstrates how to get a list of bucket objects using the prefix and delimiter query params to get an XML result with CommonPrefixes. Java

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[])
  {
    boolean success = false;

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

    CkHttp http = new CkHttp();

    // Insert your access key here:
    http.put_AwsAccessKey("AWS_ACCESS_KEY");

    // Insert your secret key here:
    http.put_AwsSecretKey("AWS_SECRET_KEY");

    // In this example, my bucket is "chilkat100".
    // It contains a number of folders, one of which is named "images".
    // I want to get a list of all sub-folders under the "images" folder
    String strXml = http.s3_ListBucketObjects("chilkat100?prefix=images/&delimiter=/");
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

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

    CkXml xml = new CkXml();
    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("----");

    // Here is the list of sub-folders (i.e. CommonPrefixes)

    // <?xml version="1.0" encoding="UTF-8"?>
    // <ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    //     <Name>chilkat100</Name>
    //     <Prefix>images/</Prefix>
    //     <Marker/>
    //     <MaxKeys>1000</MaxKeys>
    //     <Delimiter>/</Delimiter>
    //     <IsTruncated>false</IsTruncated>
    //     <CommonPrefixes>
    //         <Prefix>images/africa/</Prefix>
    //     </CommonPrefixes>
    //     <CommonPrefixes>
    //         <Prefix>images/sea_creatures/</Prefix>
    //     </CommonPrefixes>
    // </ListBucketResult>

    String Prefix;

    // The XML can be parsed like this:
    int i = 0;
    int count_i = xml.NumChildrenHavingTag("CommonPrefixes");
    while (i < count_i) {
        xml.put_I(i);
        Prefix = xml.getChildContent("CommonPrefixes[i]|Prefix");
        System.out.println("Prefix = " + Prefix);
        i = i+1;
        }
  }
}