在spring batch中，如何在多个ItemProcessor运行之间共享价值？

@Bean
@StepScope
public SharedContext sharedContext() {
    return new SharedContext();
}

public class MyItemProcessor implements ItemProcessor<Input, Output> {

    private SharedContext sharedContext;

    public MyItemProcessor(SharedContext sharedContext) {
        this.sharedContext = sharedContext;
    }

    @Override
    public Output process(Input item) throws Exception {
        // 使用共享上下文对象中的值进行处理
        String sharedValue = sharedContext.getSharedValue();
        // 其他处理逻辑
        return output;
    }
}

@Bean
public Step myStep(ItemReader<Input> reader, ItemWriter<Output> writer, MyItemProcessor processor, SharedContext sharedContext) {
    return stepBuilderFactory.get("myStep")
            .<Input, Output>chunk(10)
            .reader(reader)
            .processor(processor)
            .writer(writer)
            .listener(new ExecutionContextPromotionListener(sharedContext)) // 将共享上下文对象传递给ItemProcessor
            .build();
}