Spring Batch：读取器、处理器和写入器启动时的日志

Question

当读卡器、处理器和写入程序在一个步骤中运行时，我只需要打印一次日志。如何做到这一点，使日志不会在每次处理数据块时打印？

批次类

@Configuration
@EnableBatchProcessing
public class Batch
{
    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private ProcessorListener processorListener;

    @Autowired
    private WriterListener writerListener;


    @Autowired
    private MainJobExecutionListener mainJobExecutionListener;

    @Bean
    public Step step(Reader reader, Processor processor, Writer writer)
    {
        return stepBuilderFactory.get("step")
                .<Input, Output>chunk(10)
                .reader(reader)
                .processor(processor)
                .writer(writer)
                .faultTolerant().skipPolicy(new ExceptionSkipPolicy())
                .listener(processorListener)
                .listener(writerListener)
                .build();
    }

    @Bean
    public Job mainJob(Step step)
    {
        return jobBuilderFactory.get("mainJob")
                                .listener(mainJobExecutionListener)
                                .incrementer(new RunIdIncrementer())
                                .start(step)
                                .build();
    }
}

处理器侦听器示例类我还有另一个要编写的侦听器类。

@Log4j2
@Component
public class ProcessorListener implements ItemProcessListener<Input, Output>
{
    @Override
    public void beforeProcess(Input input)
    {
        log.info("step: start processor");
    }

    @Override
    public void afterProcess(Input input, Output output) { }

    @Override
    public void onProcessError(Input input, Exception e) { }
}

Answer 1

您可以在那里使用@PostConstruct注释和日志内容，或者只是在构造函数中使用它？