如何在FlatFileItemReader - Spring批处理中使用@JoinColumn属性(实体)映射CSV字段

@Entity
public class MyEntity {
    @Id
    private Long id;

    @JoinColumn("csv_field_1")
    private String field1;

    @JoinColumn("csv_field_2")
    private int field2;

    // 省略getter和setter方法
}

@Component
public class MyEntityFieldSetMapper implements FieldSetMapper<MyEntity> {
    @Override
    public MyEntity mapFieldSet(FieldSet fieldSet) throws BindException {
        MyEntity entity = new MyEntity();
        entity.setField1(fieldSet.readString("csv_field_1"));
        entity.setField2(fieldSet.readInt("csv_field_2"));
        return entity;
    }
}

@Component
public class MyEntityLineMapper implements LineMapper<MyEntity> {
    private DefaultLineMapper<MyEntity> delegate = new DefaultLineMapper<>();

    public MyEntityLineMapper() {
        delegate.setLineTokenizer(new DelimitedLineTokenizer(","));
        delegate.setFieldSetMapper(new MyEntityFieldSetMapper());
    }

    @Override
    public MyEntity mapLine(String line, int lineNumber) throws Exception {
        return delegate.mapLine(line, lineNumber);
    }
}

@Configuration
@EnableBatchProcessing
public class BatchConfig {
    @Bean
    public FlatFileItemReader<MyEntity> myEntityReader() {
        FlatFileItemReader<MyEntity> reader = new FlatFileItemReader<>();
        reader.setResource(new ClassPathResource("data.csv"));
        reader.setLineMapper(new MyEntityLineMapper());
        return reader;
    }

    // 其他配置...

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private FlatFileItemReader<MyEntity> myEntityReader;

    @Bean
    public Step myStep() {
        return stepBuilderFactory.get("myStep")
                .<MyEntity, MyEntity>chunk(10)
                .reader(myEntityReader)
                .processor(myProcessor())
                .writer(myWriter())
                .build();
    }

    // 其他配置...

}