我有这个
FileWriter
,我试图将当前的作业 Id 附加到生成的文件名中。
<bean id="csvFileWriter" class="org.springframework.batch.item.file.FlatFileItemWriter" scope="step">
<property name="resource">
<bean class="org.springframework.core.io.FileSystemResource">
<constructor-arg type="java.lang.String">
<value>${csv.file}_#{stepExecution.jobExecution.jobId}</value>
</constructor-arg>
</bean>
</property>
<property name="lineAggregator">
<bean class="org.springframework.batch.item.file.transform.DelimitedLineAggregator">
<property name="delimiter">
<util:constant
static-field="org.springframework.batch.item.file.transform.DelimitedLineTokenizer.DELIMITER_COMMA"/>
</property>
<property name="fieldExtractor">
<bean class="org.springframework.batch.item.file.transform.PassThroughFieldExtractor" />
</property>
</bean>
</property>
....
....
但它正在被轰炸
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Field or property 'stepExecution' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext'
at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:208)
at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:72)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:52)
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97)
at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:82)
at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:1)
at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:139)
... 45 more
知道在这种情况下如何正确引用
jobId
吗?
更新:添加工作解决方案
我实现了
JobExecutionListener
,将 jobId
添加到 ExecutionContext
public class MyExecutionListener implements JobExecutionListener {
public void beforeJob(JobExecution jobExecution) {
long jobId = jobExecution.getJobId();
jobExecution.getExecutionContext().put("jobId",jobId);
jobExecution.getExecutionContext().put("date",date);
}
public void afterJob(JobExecution jobExecution) {
将监听器注册到批处理作业
<batch:job id="batchJob">
<batch:listeners>
<batch:listener ref="myExecutionListener"/>
</batch:listeners>
最后 CSV 编写器更新为
<bean id="fundAssetCsvFileWriter"
class="org.springframework.batch.item.file.FlatFileItemWriter" scope="step">
<property name="resource">
<bean class="org.springframework.core.io.FileSystemResource">
<constructor-arg value="${csv.file.name}_#{jobExecutionContext['date']}_#{jobExecutionContext['jobId']}.csv" type="java.lang.String"/>
</bean>
后期绑定支持的名称是:
#{jobParameters}
#{jobExecutionContext}
#{stepExecutionContext}
如果无法直接访问
jobId
,请查看这个问题。
此外,
resource
可以直接注入为
<property name="resource">
<value>file://${csv.file}_#{jobExecutionContext['jobId']}</value>
</property>
因为正确的资源类型是使用转换器创建的。
#{stepExecution.jobExecution.id}
或 #{stepExecution.jobExecutionId}
应该可以工作。
StepContext确实提供对 StepExecution 的访问,以便通过 SpEL 表达式进行后期绑定。