Quick way to list all files in Amazon S3 bucket?

Question

I have an amazon s3 bucket that has tens of thousands of filenames in it. What\'s the easiest way to get a text file that lists all the filenames in the bucket?

Answer 1

Simplified and updated version of the Scala answer by Paolo:

import scala.collection.JavaConversions.{collectionAsScalaIterable => asScala}
import com.amazonaws.services.s3.AmazonS3
import com.amazonaws.services.s3.model.{ListObjectsRequest, ObjectListing, S3ObjectSummary}

def buildListing(s3: AmazonS3, request: ListObjectsRequest): List[S3ObjectSummary] = {
  def buildList(listIn: List[S3ObjectSummary], bucketList:ObjectListing): List[S3ObjectSummary] = {
    val latestList: List[S3ObjectSummary] = bucketList.getObjectSummaries.toList

    if (!bucketList.isTruncated) listIn ::: latestList
    else buildList(listIn ::: latestList, s3.listNextBatchOfObjects(bucketList))
  }

  buildList(List(), s3.listObjects(request))
}

Stripping out the generics and using the ListObjectRequest generated by the SDK builders.