How to get Job parameteres in to item processor using spring Batch annotation

Question

I am using spring MVC. From my controller, I am calling jobLauncher and in jobLauncher I am passing job parameters like below and I'm using annotations to enable configuration as below:

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {
        // read, write ,process and invoke job
} 

JobParameters jobParameters = new JobParametersBuilder().addString("fileName", "xxxx.txt").toJobParameters();
stasrtjob = jobLauncher.run(job, jobParameters);                              

and here is my itemprocessor                                                         
public class DataItemProcessor implements ItemProcessor<InputData, OutPutData> {

  public OutPutData process(final InputData inputData) throws Exception {

        // i want to get job Parameters here ????

  }

}

Answer 1

1) Put a scope annotation on your data processor i.e.

@Scope(value = "step") 

2) Make a class instance in your data processor and inject the job parameter value by using value annotation :

@Value("#{jobParameters['fileName']}")
private String fileName;

Your final Data processor class will look like:

@Scope(value = "step")
public class DataItemProcessor implements ItemProcessor<InputData, OutPutData> {

@Value("#{jobParameters['fileName']}")
private String fileName;

  public OutPutData process(final InputData inputData) throws Exception {

        // i want to get job Parameters here ????
      System.out.println("Job parameter:"+fileName);

  }

  public void setFileName(String fileName) {
        this.fileName = fileName;
    }


}

In case your data processor is not initialized as a bean, put a @Component annotation on it:

@Component("dataItemProcessor")
@Scope(value = "step")
public class DataItemProcessor implements ItemProcessor<InputData, OutPutData> {