Specify Header and Footer for all file created by MultiResourceItemWriter when writing in multiples files -spring batch

How could I add the header and the footer for all files created by MultiResourceItemWriter When writing.

You need to set the header/footer callbacks on your delegate writer. Here is a quick example:

import java.io.IOException;import java.io.Writer;import java.util.Arrays;import org.springframework.batch.core.Job;import org.springframework.batch.core.JobParameters;import org.springframework.batch.core.Step;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.launch.JobLauncher;import org.springframework.batch.item.ItemReader;import org.springframework.batch.item.ItemWriter;import org.springframework.batch.item.file.FlatFileFooterCallback;import org.springframework.batch.item.file.FlatFileHeaderCallback;import org.springframework.batch.item.file.FlatFileItemWriter;import org.springframework.batch.item.file.ResourceSuffixCreator;import org.springframework.batch.item.file.builder.FlatFileItemWriterBuilder;import org.springframework.batch.item.file.builder.MultiResourceItemWriterBuilder;import org.springframework.batch.item.file.transform.PassThroughLineAggregator;import org.springframework.batch.item.support.ListItemReader;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.FileSystemResource;@Configuration@EnableBatchProcessingpublic class MyJob {    @Bean    public ItemReader<Integer> itemReader() {        return new ListItemReader<>(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10));    }    @Bean    public ItemWriter<Integer> itemWriter() {        FlatFileItemWriter<Integer> flatFileItemWriter = new FlatFileItemWriterBuilder<Integer>()                .lineAggregator(new PassThroughLineAggregator<>())                .name("itemsWriter")                .headerCallback(writer -> writer.write("header"))                .footerCallback(writer -> writer.write("footer"))                .build();        return new MultiResourceItemWriterBuilder<Integer>()                .delegate(flatFileItemWriter)                .resource(new FileSystemResource("items"))                .itemCountLimitPerResource(5)                .resourceSuffixCreator(index -> "-" + index + ".txt")                .name("multiResourcesWriter")                .build();    }    @Bean    public Job job(JobBuilderFactory jobs, StepBuilderFactory steps) {        return jobs.get("job")                .start(steps.get("step")                        .<Integer, Integer>chunk(5)                        .reader(itemReader())                        .writer(itemWriter())                        .build())                .build();    }    public static void main(String[] args) throws Exception {        ApplicationContext context = new AnnotationConfigApplicationContext(MyJob.class);        JobLauncher jobLauncher = context.getBean(JobLauncher.class);        Job job = context.getBean(Job.class);        jobLauncher.run(job, new JobParameters());    }}

This generates two files items-1.txt and items-2.txt with the following content:

header12345footer

and

header678910footer

I use spring batch version 3.0.10.RELEASE

This version is not maintained anymore, so I encourage you to upgrade to the latest and greatest v4.3.1. The example above uses Spring Batch v4.3.1 and works as expected.