Item Writers - Spring Batch - page 309

resource Resource null (required) A prototype of the resources to

be created by
MultiResourceItemWriter .

resourceSuffixCreator ResourceSuffix

Creator

null Optionally,

MultiResourceItemWriter can
use this class to append a
suffix to the end of the file
names it creates.

saveState Boolean true If false , the state of the

ItemWriter isn't maintained in
the JobRepository.

To see how this works, you extract customers from the database and create XML files containing 10
customers each. To make this work, you don't need to develop any new code (you created the XML). All
you need to do is wire everything up. Let's start working with this example by looking at the
configuration for the job.
Listing 9-62 shows the configuration for the ItemReader in this example. In this case, it's a simple
JdbcCursorItemReader configured to select all customers. From there, you pass the customers you
receive from the database to the ItemWriter you configure next.

Listing 9-62. The multiResource formatJob 's ItemReader

…
<beans:bean id="customerItemReader"
class="org.springframework.batch.item.database.JdbcCursorItemReader">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="sql" value="select * from customer"/>
<beans:property name="rowMapper" ref="customerRowMapper"/>
</beans:bean>

<beans:bean id="customerRowMapper"
class="com.apress.springbatch.chapter9.CustomerRowMapper"/>
…

The configuration for this ItemWriter is in layers. First you configure the StaxEventItemWriter that
you use for the XML generation. With that configured you layer MultiResourceItemWriter on top to
generate multiple resources the StaxEventItemWriter writes to. Listing 9-63 shows the configuration of
the output half of the job as well as the step and job configuration.

Listing 9-63. ItemWriters and Step and Job Configuration

...
<beans:bean id="outputFile"
class="org.springframework.core.io.FileSystemResource" scope="step">
<beans:constructor-arg value="#{jobParameters[outputFile]}"/>
</beans:bean>

<beans:bean id="xmlOutputWriter"