AbstractFileItemWriter should support java.nio

[spring-projects-issues]

rowi1de opened BATCH-2858 and commented

spring-batch-infrastructure: AbstractFileItemWriter.java
always uses java.ioFileOutputStream no matter which _org.springframework.core.io.Resource_ is used. Currently, there is no NIO based Resource available in Spring Core.

As the class represents a FileItemWriter, Resource could be specialized to a WritableResource. This allows a AbstractFileItemWriter java.nio based implementation.

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