我和我的作者有个问题 afterStep() 未被调用：

public class MyWriter implements ItemStreamWriter<MyDTO>, StepExecutionListener {
    private FlatFileItemWriter<MyDTO> delegate;
    private Resource resource;
    public void setDelegate(final FlatFileItemWriter<MyDTO> delegate) {
        this.delegate = delegate;
        delegate.setResource(resource);
    }
    public void setResource(final Resource resource) {
        this.resource = resource;
        if (delegate != null) {
            delegate.setResource(resource);
        }
    }
    @Override
    public void write(List<? extends MyDTO> items) throws Exception {
        delegate.write(items);
    }
    @Override
    public void open(ExecutionContext executionContext) throws ItemStreamException {
        delegate.open(executionContext);
    }
    @Override
    public void update(ExecutionContext executionContext) throws ItemStreamException {
        delegate.update(executionContext);
    }
    @Override
    public void close() throws ItemStreamException {
        delegate.close();
    }
    @Override
    public void beforeStep(StepExecution stepExecution) {
        // do nothing
    }
    @Override
    public ExitStatus afterStep(StepExecution stepExecution) {
        // do nothing
        return null;
    }

我还对bean进行了一步范围分析：

@Bean
    @StepScope
    public ItemStreamWriter<MyDTO> itemWriter() {
        DelimitedLineAggregator<MyDTO> lineAggregator = new DelimitedLineAggregator<>();
        BeanWrapperFieldExtractor<MyDTO> extractor = new BeanWrapperFieldExtractor<>();
        extractor.setNames(new String[]{"test"});
        lineAggregator.setFieldExtractor(extractor);
        MyWriter writer = new MyWriter();
        FlatFileItemWriter<MyDTO> flatFileItemWriter = new FlatFileItemWriter<>();
        flatFileItemWriter.setLineAggregator(lineAggregator);
        flatFileItemWriter.setShouldDeleteIfExists(true);
        flatFileItemWriter.afterPropertiesSet();
        writer.setDelegate(flatFileItemWriter);
        writer.setResource(new FileSystemResource(getRequestOutputResource(blah)));
        return writer;
    }