How to set the resource of MultiResourceItemWriter dynamically from ItemReader in Spring Batch

Question

The batch job is:

• Reading from a csv file

• Create an xml file for every record(line) in the csv with name Patent.ID.xml(where ID is a field i

Answer 1

I couldn't find a way to make Luca's solution to work, so I extended MultiResourceItemWriter this way:

public class MyMultipleItemWriter extends MultiResourceItemWriter<MyBeanXml>
{
    @Override
    public void write(List<? extends MyBeanXml> items) throws Exception
    {
        this.setResourceSuffixCreator(new MySuffixCreator(items.get(0).getField()));
        super.write(items);
    }
}

Answer 2

Create a ItemWriteListener, inject the multiResourceItemWriter bean and bound the listener to your step.
In ItemWriteListener.beforeWrite() create a new ResourceSuffixCreator object using the item your are going to write as base to create resource extension (suffix).
MultiResourceItemWriter.resource probably need to be changed as file:xml/ because 1.xml, 2.xml and so on will be appended using custom ResourceSuffixCreator dinamically created for every item you are writing.

This solution is dirty and (probably) works due to commit-interval=1; if you change my answer (probably) will fail.

I hope I was clear, English is not my native language.