java - Spring Boot 批处理调度程序运行一次

Question

我从2.1.4版本开始学习Spring Boot Batch

我想在调度程序中运行我的作业，并且该作业仅运行一次。我的意思是 ItemProcessor 和 ItemWriter 仅运行一次。 ItemReader 每次都会运行。任何人都知道我做错了什么。将来，我想将调度程序更改为 Java WatchService 并将 filePath 传递给作业，但现在 filePath 的参数就像函数参数中的字符串。这是我的代码:

这是我的读者:

@Component
public class UserReaderImpl  {
    @StepScope
    public ItemReader<UserCsvStructure> read(String filepath) {
        FlatFileItemReader<UserCsvStructure> reader = new FlatFileItemReader();
        reader.setLinesToSkip(1);
        reader.setResource(new FileSystemResource(filepath));
        reader.setLineMapper(new DefaultLineMapper<UserCsvStructure>() {
            {
                setLineTokenizer(new DelimitedLineTokenizer() {
                    {
                        setNames(new String[]{"firstName","lastName","email"});
                    }
                });
                setFieldSetMapper(new BeanWrapperFieldSetMapper<UserCsvStructure>() {
                    {
                        setTargetType(UserCsvStructure.class);
                    }
                });
            }
        });
        return reader;
    }
}

这在我的 ItemProcessor 中

@StepScope
@Component
public class UserProcessorImpl implements ItemProcessor<UserCsvStructure, User> {
@Override
public User process(UserCsvStructure userCsvStructure) throws Exception {
    return User.builder()
            .email(userCsvStructure.getEmail())
            .firstName(userCsvStructure.getFirstName())
            .lastName(userCsvStructure.getLastName())
            .build();
}
}

这是我的 ItemWriter

@Component
@StepScope
public class UserWriterImpl implements ItemWriter<User>{
@Autowired
private UserRepository userRepository;

@Override
public void write(List<? extends User> list) throws Exception {
    System.out.println(list);
    userRepository.saveAll(list);
}
}

这是我的配置

@Component
public class UserBatchCsvConfig {

@Autowired
public JobBuilderFactory jobBuilderFactory;

@Autowired
public StepBuilderFactory stepBuilderFactory;

@Autowired
private UserReaderImpl userReader;

@Autowired
private UserWriterImpl userWriter;

@Autowired
private UserProcessorImpl userProcessor;

public Job csvFileToDatabaseJob(UserJobCompletionNotificationListener listener, String fileName) {
    return jobBuilderFactory.get("userCsvProcess")
            .incrementer(new RunIdIncrementer())
            .listener(listener)
            .flow(csvFileToDatabaseStep(fileName))
            .end()
            .build();
}

private Step csvFileToDatabaseStep(String fileName) {
    return stepBuilderFactory.get("userCsvProcess")
            .<UserCsvStructure, User>chunk(1)
            .reader(userReader.read(fileName))
            .processor(userProcessor)
            .writer(userWriter)
            .build();
}

}

最后一个类是我的调度程序:

@Component
public class UserCsvProcessor {

@Autowired
private JobLauncher jobLauncher;

@Autowired
private UserBatchCsvConfig job;

@Autowired
private UserJobCompletionNotificationListener userJobCompletionNotificationListener;

@Scheduled(fixedDelay = 10000)
public void runJob() throws Exception {
    jobLauncher.run(job.csvFileToDatabaseJob(userJobCompletionNotificationListener, "C:\\Users\\Anik\\Desktop\\angular\\test.csv"), new JobParameters());
}
}

Answer 1

我知道我应该在代码中添加什么在 UserCsvProcessor 类中，我需要将计划函数更改为:

@Scheduled(fixedDelay = 10000)
public void runJob() throws Exception {
    JobParameters params = new JobParametersBuilder()
            .addString("JobID", String.valueOf(System.currentTimeMillis()))
            .toJobParameters();
    jobLauncher.run(job.csvFileToDatabaseJob(userJobCompletionNotificationListener, "C:\\Users\\Anik\\Desktop\\angular\\test.csv"), params);
}

如果有人有其他想法或更好的想法，只需添加答案