项目阅读器和项目编写器的Spring批量后期绑定

Question

我想实现项目阅读器和项目编写者的后期绑定。应动态配置读写器。

JobController.java

@RestController
@RequestMapping("/job")
public class JobController {

@Autowired
private JobLauncher jobLauncher;

@Autowired
private Job customJob;

@RequestMapping(value = "/cust", method = RequestMethod.GET)
public void runCustJob() {

    JobParametersBuilder jobBuilder = 
              new JobParametersBuilder();
    jobBuilder.addLong("time",System.currentTimeMillis());
    jobBuilder.addString("reader", "fileToFileReader");
    jobBuilder.addString("writer", "fileToFileWriter"); 

    try {           
        jobLauncher.run(customJob, jobBuilder.toJobParameters());

    } catch (Exception e) {
        e.printStackTrace();
    }
}


}

JobConfig.java

@Configuration
@EnableBatchProcessing
public class JobConfig {

@Autowired
private JobBuilderFactory jobBuilderFactory;

@Autowired
private StepBuilderFactory stepBuilderFactory;

@Autowired
private Environment env;    

@Autowired
private ApplicationContext ac;


@Bean
@StepScope
public FileToFileReader fileToFileReader()//@Value("#    {jobParameters['filePath']}") String filePath
{
  //configure flatfileitemreader
    return reader;
}

@Bean
@StepScope
public FileToFileWriter fileToFileWriter()
{
    //configure flatfileitemwriter
    return writer;
}

@Bean
public Job customJob(@Value("#{jobParameters['reader']}") String reader,     @Value("#{jobParameters['writer']}") String writer)//@Value("#{jobParameters['reader']}") String reader, @Value("#{jobParameters['writer']}") String writer
{
    return jobBuilderFactory.get("customJob")
    .incrementer(new RunIdIncrementer())
    .flow(processFile1(reader, writer))
    .end()
    .build();
}

@Bean
public Step processFile1(String reader, String writer) {
    return stepBuilderFactory.get("processFile1").allowStartIfComplete(true)
            .<Person, Person> chunk(100)
            .reader((ItemReader<? extends Person>) ac.getBean(reader))
            .writer((ItemWriter<? super Person>) ac.getBean(writer))
            .build(); 
}
}

我想在JobController.java中将bean名称设置为jobParameters，并在JobConfig.java中按名称访问bean。我试过@JobScope和@StepScope，但是没有用，或者我可能不适当地使用了这些示波器。

请告诉我如何实现后期绑定。