In Spring Batch, items are read from the source using reader and written to destination using a writer. Sometimes, we need to add business logic between the reader and writer for the following purpose1) Filtering an item2) Converting an item read from one format to another before written to the destination3) Modify the item read…… Continue reading Filtering items using ItemProcessor
Category: Spring Batch
Adding job level listeners using JobExecutionListener
Spring Batch provides a facility to add listeners at job level. The listeners are executed before the job is started and after the job is finished. This post explains how to create listeners and integrate them with the job. We can add our custom processing logic in these listeners and expect them to be called…… Continue reading Adding job level listeners using JobExecutionListener
FlatFileHeaderCallback and FlatFileFooterCallback example
In this post I will explain how to add header and footer to the destination file created by Spring batch. When Spring batch transfer records from source to destination file in batch, it provides facility through which the programmer can provide header and footer information thathas to added in the destination file. To take advantage…… Continue reading FlatFileHeaderCallback and FlatFileFooterCallback example
Custom FieldSetMapper example
In the previous post “Spring Batch Simple Example” we used “BeanWrapperFieldSetMapper” while reading the employee records from the file. The BeanWrapperFieldSetMapper created a newinstance of Employee class for every employee record in the file and set the instance fields. We can have more control on the task performed by BeanWrapperFieldSetMapper by providing a custom implementation…… Continue reading Custom FieldSetMapper example
Spring Batch Simple Example Part 3
In this post I will explain how to combine the reader and writer in a job and how to run the job. We define a job which will transfer the employee records from one file to another file in batches. <batch:job id=”importEmployees”> <batch:step id=”readWriteEmployees”> <batch:tasklet> <batch:chunk reader=”reader” writer=”writer” commit-interval=”50″/> </batch:tasklet> </batch:step> </batch:job> <bean id=”transactionManager” class=”org.springframework.jdbc.datasource.DataSourceTransactionManager”>…… Continue reading Spring Batch Simple Example Part 3
Spring Batch Simple Example Part 2
In this post, I will explain how to write the employee objects created in the reading process to a file. To write the list of employee records in batches, we need to create an instance of org.springframework.batch.item.file.FlatFileItemWriter. It takes two information1) the resource file where the information has to be written2) An instance of LineAggregator…… Continue reading Spring Batch Simple Example Part 2
Spring Batch Simple Example Part 1
In this post and next post, I will introduce Spring Batch to you with a simple example. Spring batch is an open source framework useful for exporting data from source to destination in batches. The framework is very useful for batch applications. Reading data In our example, we will read employee records and move them…… Continue reading Spring Batch Simple Example Part 1
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