java - Spring Batch - Read files from Aws S3 -


i trying read files aws s3 , process spring batch:

can spring itemreader process task? if so, how pass credentials s3 client , config spring xml read file or multiple files

<bean id="itemreader" class=""org.springframework.batch.item.file.flatfileitemreader"">     <property name="resource" value=""${aws.file.name}"" />     </bean>

update use spring-cloud-aws still use flatfileitemreader don't need make custom extended resource.

instead set aws-context , give s3client bean.

    <aws-context:context-resource-loader amazon-s3="amazons3client"/>

the reader set other reader - thing that's unique here autowire resourceloader 

@autowired private resourceloader resourceloader;

and set resourceloader:

@bean public flatfileitemreader<map<string, object>> awsitemreader() {     flatfileitemreader<map<string, object>> reader = new flatfileitemreader<>();     reader.setlinemapper(new jsonlinemapper());     reader.setrecordseparatorpolicy(new jsonrecordseparatorpolicy());     reader.setresource(resourceloader.getresource("s3://" + amazons3bucket + "/" + file));     return reader; }

i use flatfileitemreader , customization needs take place making own s3 resource object. extend spring's abstractresource create own aws resource contains amazons3 client, bucket , file path info etc..

for getinputstream use java sdk: 

        s3object object = s3client.getobject(new getobjectrequest(bucket, awsfilepath));         return object.getobjectcontent();

then contentlength - 

return s3client.getobjectmetadata(bucket, awsfilepath).getcontentlength();

and lastmodified use

.getlastmodified().gettime();

the resource make have amazons3client contains info spring-batch app needs communicate s3. here's java config.

    reader.setresource(new amazons3resource(amazons3client, amazons3bucket, inputfile));

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