什么是Spring Batch的“默认"商品?上下文变量? [英] What are the Spring Batch "default" Context Variables?

问题描述

在 Spring Batch step中-scope 文档，其中有三个无法解释的spring-batch上下文映射:jobParameters，jobExecutionContext和stepExecutionContext.

Springsource示例代码，组合:

Springsource sample code, combined:

<bean id="flatFileItemReader" scope="step"
  class="org.springframework.batch.item.file.FlatFileItemReader">
    <property name="var1" value="#{jobParameters['input.file.name']}" />
    <property name="var2" value="#{jobExecutionContext['input.file.name']}" />
    <property name="var3" value="#{stepExecutionContext['input.file.name']}" />
</bean>

jobParameters，jobExecutionContext和stepExecutionContext中可用的默认参数是什么?

What are the default parameters available within jobParameters, jobExecutionContext, and stepExecutionContext?

Spring Batch版本1.x与2.x与3.x之间也可能存在差异-该领域的文档非常稀缺.

There are also likely differences between what's available in Spring Batch version 1.x vs. 2.x vs. 3.x--the documentation is pretty scarce in this area.

推荐答案

#{jobParameters}，#{jobExecutionContext}和#{stepExecutionContext}是

#{jobParameters}, #{jobExecutionContext} and #{stepExecutionContext} are the spEL (Spring Expression Language) counterpart of JobParameters, JobExecution and StepExecution objects available in late-binding to allow non-static access to this objects values from step scoped object.

它们支持Map的访问，因此您可以访问与JobExecution和StepExecution关联的ExecutionContext 以及存储在JobParameters中的值.

They support access as Maps so you can access the ExecutionContext associated to JobExecution and StepExecution and values stored in JobParameters.

还要检查 StepScope 文档以获取更多信息.

Also check StepScope documentation for more information.

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