如何在springboot中的ConversionService中自动装配

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试图在springboot中访问模型中的ConversionControl,没有运气.

  1. @Component
  2. public class CityHelperService {
  3. @Autowired
  4. ConversionService conversionService;// = ConversionServiceFactory.registerConverters();
  5. public City toEntity(CityDTO dto){
  6. City entity = conversionService.convert(dto,City.class);
  7. return entity;
  8. }
  9. public CityDTO toDTO(City entity){
  10. CityDTO dto = conversionService.convert(entity,CityDTO.class);
  11. return dto;
  12. }
  13. }

显示以下错误

  1. Injection of autowired dependencies Failed;
  2. nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.lumiin.mytalk.model.CityModel com.lumiin.mytalk.controllers.CityController.cityModel;
  3. nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'cityModel' defined in file : Unsatisfied dependency expressed through constructor argument with index 1 of type [com.lumiin.mytalk.dao.CityHelperService]: : Error creating bean with name 'cityHelperService': Injection of autowired dependencies Failed;
  4. nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.core.convert.ConversionService com.lumiin.mytalk.dao.CityHelperService.conversionService;
  5. nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.core.convert.ConversionService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)};
  6. nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cityHelperService': Injection of autowired dependencies Failed;
  7. nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.core.convert.ConversionService com.lumiin.mytalk.dao.CityHelperService.conversionService;
  8. nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.core.convert.ConversionService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
显然,没有ConversionService bean可用,从最后一个嵌套异常判断:

  1. org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.core.convert.ConversionService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency.

查看Spring documentation会发现,您应该声明一个ConversionService bean.在XML配置中,它看起来像这样:

  1. factorybean">

因为你正在使用Spring Boot,我假设你是以编程方式创建上下文,所以你应该创建一个用@Bean注释的方法,它返回一个ConverstionService,就像这样(explained here):

  1. @Bean(name="conversionService")
  2. public ConversionService getConversionService() {
  3. ConversionServicefactorybean bean = new ConversionServicefactorybean();
  4. bean.setConverters(...); //add converters
  5. bean.afterPropertiesSet();
  6. return bean.getObject();
  7. }

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