如何在Spring Batch中的步骤之间传递数据

<bean id="promotionListener" class="org.springframework.batch.core.listener.ExecutionContextPromotionListener">
    <property name="keys" value="key1,key2,key3" />
</bean>

<step id="step1">
    <tasklet>
        <chunk reader="reader" processor="processor" writer="writer" commit-interval="10" />
        <listeners>
            <listener ref="promotionListener" />
        </listeners>
    </tasklet>
</step>

public class MyStepListener extends StepExecutionListenerSupport {
    @Override
    public ExitStatus afterStep(StepExecution stepExecution) {
        ExecutionContext stepContext = stepExecution.getExecutionContext();
        JobExecution jobExecution = stepExecution.getJobExecution();
        ExecutionContext jobContext = jobExecution.getExecutionContext();

        jobContext.put("key1", stepContext.get("key1"));
        jobContext.put("key2", stepContext.get("key2"));
        jobContext.put("key3", stepContext.get("key3"));

        return null;
    }
}

public class MyOtherStep {
    @BeforeStep
    public void beforeStep(StepExecution stepExecution) {
        JobExecution jobExecution = stepExecution.getJobExecution();
        ExecutionContext jobContext = jobExecution.getExecutionContext();

        Object data1 = jobContext.get("key1");
        Object data2 = jobContext.get("key2");
        Object data3 = jobContext.get("key3");

        // 使用获取到的数据进行处理
    }
}