Spring Batch FlatFileItemWriter-如何使用stepExecution.jobId生成文件名 [英] Spring Batch FlatFileItemWriter - How to use stepExecution.jobId to generate file name
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问题描述
我有这个FileWriter
,其中我尝试将当前作业ID追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>
....
....
但它正在爆炸
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
在这种情况下,我如何才能正确引用jobId
?
更新:添加工作解决方案
我实现了JobExecutionListener
,它将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) {
将侦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>
推荐答案
后期绑定支持的名称为:
#{jobParameters}
#{jobExecutionContext}
#{stepExecutionContext}
如果jobId
无法直接访问,请查看this question。
另外,resource
可以作为
<property name="resource">
<value>file://${csv.file}_#{jobExecutionContext['jobId']}</value>
</property>
因为使用转换器创建了正确的资源类型。
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