ItemReaders and ItemWriters

All batch processing can be described in its most simple form as reading in large amounts of data, performing some type of calculation or transformation, and writing the result out. Spring Batch provides three key interfaces to help perform bulk reading and writing: ItemReader, ItemProcessor, and ItemWriter.

Section Summary

• [ItemReader](<https://docs.spring.io/spring-batch/reference/readers-and-writers/item-reader.html>)
• [ItemWriter](<https://docs.spring.io/spring-batch/reference/readers-and-writers/item-writer.html>)
• [ItemStream](<https://docs.spring.io/spring-batch/reference/readers-and-writers/item-stream.html>)
• The Delegate Pattern and Registering with the Step
• Flat Files
• XML Item Readers and Writers
• JSON Item Readers And Writers
• Multi-File Input
• Database
• Reusing Existing Services
• Preventing State Persistence
• Creating Custom ItemReaders and ItemWriters
• Item Reader and Writer Implementations