如何使用java config而不是XML声明存储库populator bean?

时间:2012-12-16 01:55:45

标签: java spring jpa spring-data spring-data-jpa

我正在开发一个基于Spring的项目(迄今为止)完全没有XML,除了现在我已经使用Spring JPA存储库populator打了一堵墙:

<repository:jackson-populator location="classpath:data.json" />

如何在java @Configuration类中表达上述内容?

这篇文章建议直接使用FactoryBean: https://stackoverflow.com/a/13566712/1746274

我试过了,我得到的最接近的是以下但是不太正确。

@Bean(name="repositoryPopulator")
public RepositoryPopulator getRespositoryPopulator() throws Exception {
    final JacksonRepositoryPopulatorFactoryBean factory =  new JacksonRepositoryPopulatorFactoryBean();
    factory.getObject().setResourceLocation("classpath:test-data.json");
    factory.afterPropertiesSet();
    return factory.getObject();
}

以上结果为FactoryBeanNotInitializedException,邮件为JacksonRepositoryPopulatorFactoryBean does not support circular references

有什么想法吗?

1 个答案:

答案 0 :(得分:23)

实际上是直截了当的:

@Configuration
class ApplicationConfig {

  @Bean
  public JacksonRepositoryPopulatorFactoryBean repositoryPopulator() {

    Resource sourceData = new ClassPathResource("test-data.json");

    JacksonRepositoryPopulatorFactoryBean factory = new JacksonRepositoryPopulatorFactoryBean();
    // Set a custom ObjectMapper if Jackson customization is needed
    factory.setObjectMapper(…);
    factory.setResources(new Resource[] { sourceData });
    return factory;
  }
}

通过返回FactoryBean本身,Spring将负责调用所有必需的回调接口(即setApplicationContext(…)setBeanClassLoader(…)等)。工厂bean是ApplicationListener,因此会在ContextRefreshedEvent完全初始化时收听ApplicationContext并触发填充。