How to load Resources that are outside of JAR into MultiResourceItemReader? - resources

Question

I'm trying to load Resource[] into a `MultiResourceItemReader. Running the app locally, I can inject the resources directly as they're contained in the resources directory.
However, the app will be deployed as a jar to a server, at which point the resources (flat files) will be located outside of the jar. I'm having trouble using PathMatchingResourcePatternResolver-- I keep getting a "No resources found" error.

Answer 1

MultiResourceItemReader can read from path outside jar. Just try giving absolute path of the resources.
let say you have input files in /data/inputs/csv/ directory with pattern example*.csv, then in application.properties file you can have
input.files.location=/data/inputs/csv/
input.file.pattern=example*.csv
then in the MultiResourceItemReader config, you can give as following,
#Value("file:${input.files.location}${input.file.pattern}")
private Resource[] inputResources; //thus inputResources will have files matching pattern example*.csv in folder
#Bean
public MultiResourceItemReader<T> multiResourceItemReader()
{
MultiResourceItemReader<T> resourceItemReader = new MultiResourceItemReader<T>();
resourceItemReader.setResources(inputResources);
resourceItemReader.setDelegate(reader());
return resourceItemReader;
}