Spring Batch -映射和写入1->多行

@Component
public class ParentChildItemProcessor implements ItemProcessor<Parent, Child> {

    @Override
    public Child process(Parent parent) throws Exception {
        List<Child> children = new ArrayList<>();
        
        // 将父对象拆分为多个子对象
        for (int i = 0; i < parent.getChildCount(); i++) {
            Child child = new Child();
            child.setParentId(parent.getId());
            // 设置子对象的其他属性
            children.add(child);
        }
        
        return children;
    }
}

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private ItemReader<Parent> parentItemReader;

    @Autowired
    private ParentChildItemProcessor parentChildItemProcessor;

    @Autowired
    private ItemWriter<Child> childItemWriter;

    @Bean
    public Step mappingAndWritingStep() {
        return stepBuilderFactory.get("mappingAndWritingStep")
                .<Parent, List<Child>>chunk(10)
                .reader(parentItemReader)
                .processor(parentChildItemProcessor)
                .writer(childItemWriter)
                .build();
    }

    @Bean
    public Job myJob(Step mappingAndWritingStep) {
        return jobBuilderFactory.get("myJob")
                .flow(mappingAndWritingStep)
                .end()
                .build();
    }
}