Question

我在我的REST控制器上使用jobParameters

启动Spring Batch作业

@Autowired
JobLauncher jobLauncher;

@Autowired
Job job;

RequestMapping(value="/startjob", method = RequestMethod.POST, produces = "application/json")
public @ResponseBody List<EventReports> addReportIds(@RequestBody List<Integer> reportIds) throws JobParametersInvalidException, JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException {
    Logger logger = LoggerFactory.getLogger(this.getClass());
    try {
        JobParameters jobParameters = new JobParametersBuilder().addLong("time", System.currentTimeMillis())
            .addString("eventType", "Event Reports")
            .toJobParameters();
        jobLauncher.run(job, jobParameters);
    } catch (Exception e) {
        logger.info(e.getMessage());
    }
    System.out.println("Completed event reports batch job");
    return null;
}

我的BatchConfiguration类看起来像

@Configuration
@EnableBatchProcessing
@Import(AppConfig.class)
public class BatchConfiguration {

@Autowired
private JobBuilderFactory jobBuilderFactory;

@Autowired
private StepBuilderFactory stepBuilderFactory;

@Autowired
private AppConfig appConfig;

@Bean
public Job job() {
    return jobBuilderFactory.get("job")
        .incrementer(new RunIdIncrementer())
        .flow(step1())
        .end()
        .build();
}

@Bean
public Step step1() {
    return stepBuilderFactory.get("step1")
        .<String, String> chunk(1)
        .reader(new Reader())
        .processor(new Processor())
        .writer(new Writer())
        .build();
}

}

我试图在我的Reader类中打印出jobParameters

@Component
@StepScope
public class Reader implements ItemReader<String> {

private String[] messages = {"Hello World!", "Welcome to Spring Batch!"};

@Value("#{jobParameters['time']}")
private Long time;

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

private int count=0;

Logger logger = LoggerFactory.getLogger(this.getClass());

@Override
public String read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
    System.out.println("Time: " + time);
    System.out.println("Type: " + eventType);

    if(count < messages.length){
        return messages[count++];
    }else{
        count=0;
    }
    return null;
}

}

其他一切正常 - 但我的时间和eventType jobParameters的值在我的Reader类中打印为null - 尽管看起来作业是从日志判断作业参数启动

2017-04-28 15:49:25.302  INFO 12568 --- [nio-8081-exec-1] o.s.b.c.l.support.SimpleJobLauncher      : Job: [FlowJob: [nam
e=job]] launched with the following parameters: [{time=1493412564856, eventType=Event Reports}]
2017-04-28 15:49:25.716  INFO 12568 --- [nio-8081-exec-1] o.s.batch.core.job.SimpleStepHandler     : Executing step: [st
ep1]
Time: null
Type: null
#Writer Step: HELLO WORLD!
Time: null
Type: null
#Writer Step: WELCOME TO SPRING BATCH!
Time: null
Type: null
2017-04-28 15:49:26.069  INFO 12568 --- [nio-8081-exec-1] o.s.b.c.l.support.SimpleJobLauncher      : Job: [FlowJob: [nam
e=job]] completed with the following parameters: [{time=1493412564856, eventType=Event Reports}] and the following statu
s: [COMPLETED]
Completed event reports batch job
2017-04-28 16:16:52.155  INFO 12568 --- [       Thread-3] ationConfigEmbeddedWebApplicationContext : Closing org.springf
ramework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@3d82c5f3: startup date [Fri Apr 28 15:49:00

不确定我在这里失踪了什么。任何建议表示赞赏。

Answer 1

迈克尔·米内拉的回答解决了我的问题。

Answer 2

你需要掌握Job Execution＆amp;使用它获取工作参数。使用SpEL不会从作业参数中获取值。请参考今年春季论坛问题：Getting objects from JobExecutionContext

Spring Batch 3 jobParameters在步骤中为空

2 个答案: