使用 Spring 批处理，数据未从 mongodb 写入 XML 文件，为什么？
Data is not written into the XML file from mongodb using Spring Batch, Why?
我正在开发 Spring 批量 MongoDB 到 XML 的例子。我成功开发了应用程序，但我没有看到数据写入 XML 文件。你能指导我是什么问题吗？我在网上还没有看到任何有效的例子。
工作-report.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xsi:schemaLocation="http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch.xsd">
<!-- Actual Job -->
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="mongodbItemReader" writer="xmlItemWriter" commit-interval="1">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="mongodbItemReader" class="org.springframework.batch.item.data.MongoItemReader">
<property name="template" ref="mongoTemplate" />
<property name="collection" value="report" />
<property name="targetType" value="com.mkyong.model.Report" />
<property name="query" value="{'_id':{$gt:0} }" />
<property name="sort">
<util:map>
<entry key="id" value="#{T(org.springframework.data.domain.Sort.Direction).ASC}" />
</util:map>
</property>
</bean>
<bean id="xmlItemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="classpath:xml/report.xml" />
<property name="marshaller" ref="reportUnMarshaller" />
<property name="rootTagName" value="record" />
</bean>
<bean id="reportUnMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
<property name="classesToBeBound">
<value>com.mkyong.model.Report</value>
</property>
</bean>
</beans>
App.java
public class App {
public static void main(String[] args) {
String[] springConfig = { "database.xml", "context.xml", "job-report.xml" };
ApplicationContext context = new ClassPathXmlApplicationContext(springConfig);
JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");
Job job = (Job) context.getBean("reportJob");
try {
JobExecution execution = jobLauncher.run(job, new JobParameters());
System.out.println("Exit Status : " + execution.getStatus());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Done");
}
}
来自控制台的日志：
14:58:52.487 [main] DEBUG o.s.b.c.s.c.StepContextRepeatCallback - Preparing chunk execution for StepContext: org.springframework.batch.core.scope.context.StepContext@aa594b
14:58:52.487 [main] DEBUG o.s.b.c.s.c.StepContextRepeatCallback - Chunk execution starting: queue size=0
14:58:52.487 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [null]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.487 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Starting repeat context.
14:58:52.487 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat operation about to start at count=1
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoTemplate - find using query: { "_id" : { "$gt" : 0}} fields: null for class: class com.mkyong.model.Report in collection: report
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoDbUtils - Getting Mongo Database name=[yourdb]
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoDbUtils - Registering Spring transaction synchronization for MongoDB instance yourdb.
14:58:52.488 [main] DEBUG org.mongodb.driver.protocol.query - Sending query of namespace yourdb.report on connection [connectionId{localValue:3, serverValue:53}] to server 127.0.0.1:27017
14:58:52.489 [main] DEBUG org.mongodb.driver.protocol.query - Query completed
14:58:52.489 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat is complete according to policy and result value.
14:58:52.489 [main] DEBUG o.s.b.c.s.item.ChunkOrientedTasklet - Inputs not busy, ended: true
14:58:52.489 [main] DEBUG o.s.b.core.step.tasklet.TaskletStep - Applying contribution: [StepContribution: read=0, written=0, filtered=0, readSkips=0, writeSkips=0, processSkips=0, exitStatus=EXECUTING]
14:58:52.489 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Participating in existing transaction
14:58:52.490 [main] DEBUG o.s.b.core.step.tasklet.TaskletStep - Saving step execution before commit: StepExecution: id=1, version=5, name=step1, status=STARTED, exitStatus=EXECUTING, readCount=4, filterCount=0, writeCount=4 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=5, rollbackCount=0, exitDescription=
14:58:52.490 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Participating in existing transaction
14:58:52.491 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.491 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@a8ee09]
14:58:52.492 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat is complete according to policy and result value.
14:58:52.492 [main] DEBUG o.s.batch.core.step.AbstractStep - Step execution success: id=1
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.updateExecutionContext]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@5b3037]
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.update]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.494 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.494 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@baa89c]
14:58:52.495 [main] DEBUG o.s.batch.core.step.AbstractStep - Step execution complete: StepExecution: id=1, version=7, name=step1, status=COMPLETED, exitStatus=COMPLETED, readCount=4, filterCount=0, writeCount=4 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=5, rollbackCount=0
14:58:52.495 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.updateExecutionContext]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.496 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.496 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@1f2ebae]
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Completed state=reportJob.step1 with status=COMPLETED
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Handling state=reportJob.end1
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Completed state=reportJob.end1 with status=COMPLETED
14:58:52.497 [main] DEBUG o.s.batch.core.job.AbstractJob - Job execution complete: JobExecution: id=0, version=1, startTime=Tue Jan 10 14:58:52 IST 2017, endTime=null, lastUpdated=Tue Jan 10 14:58:52 IST 2017, status=COMPLETED, exitStatus=exitCode=COMPLETED;exitDescription=, job=[JobInstance: id=0, version=0, Job=[reportJob]], jobParameters=[{}]
14:58:52.497 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.update]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.501 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.501 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@498b0]
14:58:52.501 [main] INFO o.s.b.c.l.support.SimpleJobLauncher - Job: [FlowJob: [name=reportJob]] completed with the following parameters: [{}] and the following status: [COMPLETED]
Exit Status : COMPLETED
Done
在这个例子中，我确实需要手动创建 xml/report.xml 到类路径中。理想情况下，它应该是自动的。对吗？
我从 link: Complex XML using Spring Batch; StaxEventItemWriter ; Jaxb2Marshaller 得到了这个问题的解决方案。我也应该使用
<bean id="xmlItemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="file:outputs/report.xml" />
<property name="encoding" value="ISO-8859-1" />
<property name="version" value="1.0" />
<property name="marshaller" ref="reportMarshaller" />
<property name="rootTagName" value="record" />
</bean>
我正在开发 Spring 批量 MongoDB 到 XML 的例子。我成功开发了应用程序，但我没有看到数据写入 XML 文件。你能指导我是什么问题吗？我在网上还没有看到任何有效的例子。
工作-report.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xsi:schemaLocation="http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch.xsd">
<!-- Actual Job -->
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="mongodbItemReader" writer="xmlItemWriter" commit-interval="1">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="mongodbItemReader" class="org.springframework.batch.item.data.MongoItemReader">
<property name="template" ref="mongoTemplate" />
<property name="collection" value="report" />
<property name="targetType" value="com.mkyong.model.Report" />
<property name="query" value="{'_id':{$gt:0} }" />
<property name="sort">
<util:map>
<entry key="id" value="#{T(org.springframework.data.domain.Sort.Direction).ASC}" />
</util:map>
</property>
</bean>
<bean id="xmlItemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="classpath:xml/report.xml" />
<property name="marshaller" ref="reportUnMarshaller" />
<property name="rootTagName" value="record" />
</bean>
<bean id="reportUnMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
<property name="classesToBeBound">
<value>com.mkyong.model.Report</value>
</property>
</bean>
</beans>
App.java
public class App {
public static void main(String[] args) {
String[] springConfig = { "database.xml", "context.xml", "job-report.xml" };
ApplicationContext context = new ClassPathXmlApplicationContext(springConfig);
JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");
Job job = (Job) context.getBean("reportJob");
try {
JobExecution execution = jobLauncher.run(job, new JobParameters());
System.out.println("Exit Status : " + execution.getStatus());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Done");
}
}
来自控制台的日志：
14:58:52.487 [main] DEBUG o.s.b.c.s.c.StepContextRepeatCallback - Preparing chunk execution for StepContext: org.springframework.batch.core.scope.context.StepContext@aa594b
14:58:52.487 [main] DEBUG o.s.b.c.s.c.StepContextRepeatCallback - Chunk execution starting: queue size=0
14:58:52.487 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [null]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.487 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Starting repeat context.
14:58:52.487 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat operation about to start at count=1
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoTemplate - find using query: { "_id" : { "$gt" : 0}} fields: null for class: class com.mkyong.model.Report in collection: report
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoDbUtils - Getting Mongo Database name=[yourdb]
14:58:52.488 [main] DEBUG o.s.data.mongodb.core.MongoDbUtils - Registering Spring transaction synchronization for MongoDB instance yourdb.
14:58:52.488 [main] DEBUG org.mongodb.driver.protocol.query - Sending query of namespace yourdb.report on connection [connectionId{localValue:3, serverValue:53}] to server 127.0.0.1:27017
14:58:52.489 [main] DEBUG org.mongodb.driver.protocol.query - Query completed
14:58:52.489 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat is complete according to policy and result value.
14:58:52.489 [main] DEBUG o.s.b.c.s.item.ChunkOrientedTasklet - Inputs not busy, ended: true
14:58:52.489 [main] DEBUG o.s.b.core.step.tasklet.TaskletStep - Applying contribution: [StepContribution: read=0, written=0, filtered=0, readSkips=0, writeSkips=0, processSkips=0, exitStatus=EXECUTING]
14:58:52.489 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Participating in existing transaction
14:58:52.490 [main] DEBUG o.s.b.core.step.tasklet.TaskletStep - Saving step execution before commit: StepExecution: id=1, version=5, name=step1, status=STARTED, exitStatus=EXECUTING, readCount=4, filterCount=0, writeCount=4 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=5, rollbackCount=0, exitDescription=
14:58:52.490 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Participating in existing transaction
14:58:52.491 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.491 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@a8ee09]
14:58:52.492 [main] DEBUG o.s.b.repeat.support.RepeatTemplate - Repeat is complete according to policy and result value.
14:58:52.492 [main] DEBUG o.s.batch.core.step.AbstractStep - Step execution success: id=1
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.updateExecutionContext]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@5b3037]
14:58:52.492 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.update]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.494 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.494 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@baa89c]
14:58:52.495 [main] DEBUG o.s.batch.core.step.AbstractStep - Step execution complete: StepExecution: id=1, version=7, name=step1, status=COMPLETED, exitStatus=COMPLETED, readCount=4, filterCount=0, writeCount=4 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=5, rollbackCount=0
14:58:52.495 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.updateExecutionContext]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.496 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.496 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@1f2ebae]
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Completed state=reportJob.step1 with status=COMPLETED
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Handling state=reportJob.end1
14:58:52.496 [main] DEBUG o.s.b.c.job.flow.support.SimpleFlow - Completed state=reportJob.end1 with status=COMPLETED
14:58:52.497 [main] DEBUG o.s.batch.core.job.AbstractJob - Job execution complete: JobExecution: id=0, version=1, startTime=Tue Jan 10 14:58:52 IST 2017, endTime=null, lastUpdated=Tue Jan 10 14:58:52 IST 2017, status=COMPLETED, exitStatus=exitCode=COMPLETED;exitDescription=, job=[JobInstance: id=0, version=0, Job=[reportJob]], jobParameters=[{}]
14:58:52.497 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Creating new transaction with name [org.springframework.batch.core.repository.support.SimpleJobRepository.update]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT
14:58:52.501 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Initiating transaction commit
14:58:52.501 [main] DEBUG o.s.b.s.t.ResourcelessTransactionManager - Committing resourceless transaction on [org.springframework.batch.support.transaction.ResourcelessTransactionManager$ResourcelessTransaction@498b0]
14:58:52.501 [main] INFO o.s.b.c.l.support.SimpleJobLauncher - Job: [FlowJob: [name=reportJob]] completed with the following parameters: [{}] and the following status: [COMPLETED]
Exit Status : COMPLETED
Done
在这个例子中，我确实需要手动创建 xml/report.xml 到类路径中。理想情况下，它应该是自动的。对吗？
我从 link: Complex XML using Spring Batch; StaxEventItemWriter ; Jaxb2Marshaller 得到了这个问题的解决方案。我也应该使用
<bean id="xmlItemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="file:outputs/report.xml" />
<property name="encoding" value="ISO-8859-1" />
<property name="version" value="1.0" />
<property name="marshaller" ref="reportMarshaller" />
<property name="rootTagName" value="record" />
</bean>