The requirement is to fetch the data(pls refer below for sample data in file) from database and create fixed length flat file using Spring Batch. The specification for this file is there will be multiple records with the same alignment like 1-5,4-7,8-24...... Now the problem is due to records with same alignment obviously data will get overwritten. I need some solution to resolve this.
My sample code:
Here bean1,bean2 are the mapped bean object for the table.
<!-- ======================================================= -->
<!-- Jobs Definition -->
<!-- ======================================================= -->
<!-- Main processes -->
<!-- Active -->
<job id="FixedLengthFlatFileGenerationJob" xmlns="http://www.springframework.org/schema/batch">
<step id="FixedLengthFlatFileGenerationStep">
<tasklet start-limit="1">
<chunk reader="SampleReader" writer="SampleWriter"
commit-interval="1000">
</chunk>
<listeners>
<listener ref="stepExecutionListener"/>
</listeners>
</tasklet>
<next on="COMPLETED" to="FileTransferStep"/>
<next on="STOPPED" to="SendMailOnFailure"/>
<fail on="*"/>
</step>
<step id="SendMailOnFailure">
<tasklet ref="OnFailureTasklet"/>
</step>
<step id="FileTransferStep">
<tasklet ref="FileTransferTasklet" />
</step>
</job>
<!-- ======================================================= -->
<!-- Readers -->
<!-- ======================================================= -->
<bean id="SampleReader"
class="org.springframework.batch.item.database.JdbcCursorItemReader">
<property name="dataSource" ref="SampleDataSource" />
<property name="sql">
<value>
SQL READ FROM TABLE
</value>
</property>
<property name="rowMapper" ref="SampleMapper" />
</bean>
<!-- ======================================================= -->
<!-- Writers -->
<!-- ======================================================= -->
<bean id="SampleWriter"
class="org.springframework.batch.item.support.CompositeItemWriter">
<property name="delegates">
<list>
<ref local="FileTransferWriter" />
</list>
</property>
</bean>
<bean id="FileTransferWriter" class="org.springframework.batch.item.file.FlatFileItemWriter" scope="step">
<property name="resource" value="file:filelocation/file.txt" />
<property name="lineAggregator">
<bean class="org.springframework.batch.item.file.transform.FormatterLineAggregator">
<property name="fieldExtractor">
<bean class="org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor">
<property name="names" value="bean1,bean2" />
</bean>
</property>
<property name="format" value="%-20s%-30s" />
</bean>
</property>
</bean>
Sample Fixedlengthflatfile.txt
file.txt TM 45150605033000
UJK5457 0000000000HC605-B045285 D34151631115600 A
BHJ5457 724570420 34151631315600 77014 ct scan for therapy guide Physical Therapy 1S 001 002060 O AA
NTS5457 This is a test for Policy Number 5457
UJK8334 0000000000HC605-B045285 D34151631315600 A
QWS6334 724570420 34151631315600 72142 mri neck spine w/dye Occupational Therapy 2V001 002060 O AA
ETS4334 This is a test for Policy Number 4334.
RYT6313 0000000000HC216-B406574 D34151611115600 A