ItemReader will utilize LineMapper, LineTokenizer and FieldSetMapper to get a Object.
LineMapper: DefaultLineMapper, PattermMatchingCompositeLineMapper
LineTokenizer: DelimitedLineTokenizer, FixedLengthTokenizer, PattermMatchingCompositeLineTokenizer
FieldSetMapper: BeanWrapperFieldSetMapper
Configuration Hierarchy:
<ItemReader>
<LineMapper>
<LineTokenizer/>
<FieldMapper/>
</LineMapper>
<ItemReader/>
Multiple record type with single file
It is very common that a file might have records with different formats that need to be tokenized differently and mapped to different objects.
USER;Smith;Peter;;T;20014539;F
LINEA;1044391041ABC037.49G201XX1383.12H
LINEB;2134776319DEF422.99M005LI
The PatternMatchingCompositeLineMapper makes this easy by allowing maps of patterns to LineTokenizers and patterns to FieldSetMappers to be configured:
<bean id="orderFileLineMapper" class="org.spr...PatternMatchingCompositeLineMapper">
<property name="tokenizers">
<map>
<entry key="USER*" value-ref="userTokenizer" />
<entry key="LINEA*" value-ref="lineATokenizer" />
<entry key="LINEB*" value-ref="lineBTokenizer" />
</map>
</property>
<property name="fieldSetMappers">
<map>
<entry key="USER*" value-ref="userFieldSetMapper" />
<entry key="LINE*" value-ref="lineFieldSetMapper" />
</map>
</property>
</bean>
How to write a file
The ItemWriter will leverage the LineAggregator and FieldExtractor to write out the data to file.
LineAggregator: PassThroughLineAggregator, DelimitedLineAggregator
FieldExtractor: BeanWrapperFieldExtractor
Configuration Hierarchy:
<ItemWriter>
<LineAggregator>
<FieldExtractor/>
</LineAggregator>
<ItemWriter/>
