Passing object as parameter when starting spring batch job

问题

My service is starting spring batch job. I want to be able to pass some object to the job, each time this object parameter will be different. This object I need to use in my tasklet. I am starting the job by JobLauncher. As far as I googled, I see that JobParameters wont' help me in this case. Also I found that lots of answers are to use JobExecutionContext or whatsoever. But I want to inject parameter object right before job start. Is it posssible?

Service which starts the job

@Service
public class MyServiceImpl implements MyService {
    @Autowired
    private JobLauncher jobLauncher;
    @Autowired
    private Job myJob;

    @Override
    public MyResponse startJob(InputParameter inputObject) {
        try {
            //Here I want to pass somehow inputObject ot JobExecution
            jobLauncher.run(myJob, new JobParameters());
        } catch (Exception e) {
            return new MyResponse("FAILED")
        }
        return new MyResponse("OK");
    }
}

My Tasklet

@Component
@Scope("step")
public class MyTasklet implements Tasklet{

    @Override
    public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
        InputParameter inputObject = chunkContext.getStepContext().getJobExecutionContext().get("inputObject");
        //... the main logic
        return RepeatStatus.FINISHED;
    }
}

回答1:

Here's what I do to pass params to a Job:

JobParametersBuilder builder = new JobParametersBuilder();
builder.addString("fileName", fileName);
builder.addLong("time", System.currentTimeMillis());
String jobParam = request.getParameter("job");
jobLauncher.run(myJob, builder.toJobParameters());

回答2:

Use the below class to send CustomObject.

public static class CustomJobParameter<T extends Serializable> extends JobParameter {
        private T customParam;
        public CustomJobParameter(T customParam){
            super("");
            this.customParam = customParam;
        }
        public T getValue(){
            return customParam;
        }
    }

===========================

Usage:

Sending parameter:

JobParameters paramJobParameters = new JobParametersBuilder().addParameter("customparam", new CustomJobParameter(myClassReference)).toJobParameters();

Retrieving parameter:

MyClass myclass = (MyClass)jobExecution.getJobParameters().getParameters().get("customparam").getValue();

来源：https://stackoverflow.com/questions/34680189/passing-object-as-parameter-when-starting-spring-batch-job

标签

java

Spring

spring-batch