Question

我第一次在我的应用程序中使用spring batch和spring数据jpa。 Spring批处理读取一个文本文件，表示aCode，aName，sCode。我有一个POJO，它映射下面的这些键，一个键是另一种类型的对象

 public class Pojo{
  private AnotherObject sCode;  
  private String aName;
  private String aCode;
 }

以下是我在BatchConfiguration类中的读者。我该如何处理这个AnotherObject。我收到一个错误说：

引起：org.springframework.beans.NotWritablePropertyException：bean类的无效属性'sCode'[Pojo]：在输入键中找到此属性的距离＆lt; = 5的重复匹配：[“sCode”，“aCode” ，“一个名字”]。（考虑减小距离限制或更改输入键名称以使其更接近匹配。）

 @Bean
  @StepScope
  public FlatFileItemReader<Area> reader(
      @Value("#{stepExecutionContext[fromId]}") final String fromId,
      @Value("#{stepExecutionContext[toId]}") final String toId,
      @Value("#{stepExecutionContext[name]}") final String name) {
    FlatFileItemReader<Area> reader = new FlatFileItemReader<>();
    try{

      reader.setResource(new ClassPathResource("area_temp.txt"));   
      LineMapper<Area> areaMapper = createAreaLineMapper();
      reader.setLineMapper(areaMapper);
    }
    catch(Exception e){
      e.printStackTrace();
    }
    return reader;
  }

  private LineMapper<Area> createAreaLineMapper() {
    DefaultLineMapper<Area> areaLineMapper = new DefaultLineMapper<>();

    LineTokenizer areaTokenizer = createAreaTokenizer();
    areaLineMapper.setLineTokenizer(areaTokenizer);

    FieldSetMapper<Area> areaInformationMapper = createAreaInformationMapper();
    areaLineMapper.setFieldSetMapper(areaInformationMapper);

    return areaLineMapper;
}

 private LineTokenizer createAreaTokenizer() {
    DelimitedLineTokenizer areaLineTokenizer = new DelimitedLineTokenizer();
    areaLineTokenizer.setDelimiter("|");
    areaLineTokenizer.setNames(new String[]{"sCode","aCode","aName"});
    return areaLineTokenizer;
}
 private FieldSetMapper<Area> createAreaInformationMapper() {
    BeanWrapperFieldSetMapper<Area> areaMapper = new BeanWrapperFieldSetMapper<>();
    areaMapper.setTargetType(Area.class);
    return areaMapper;
}

Answer 1

异常是非常自我解释的。 BeanWrapperFieldSetMapper允许对名称进行模糊匹配。您可以通过距离配置它的模糊程度。您可以在此处阅读有关在javadoc中设置该距离的更多信息：https://docs.spring.io/spring-batch/trunk/apidocs/org/springframework/batch/item/file/mapping/BeanWrapperFieldSetMapper.html#setDistanceLimit-int-

spring batch - FlatFileItemReader - token是object类型

1 个答案: