(Java) S3 Get Bucket Objects with CommonPrefixes

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

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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();

    // 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();
    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("----");

    // 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;
        }
  }
}