Spring:使用@Qualifier()-qualified bean(如果可用),否则使用any

你可以用 @Configuration 类,在其中基于主bean和可选bean创建另一个限定bean:

@Configuration
class Config {
    @Primary @Bean
    ObjectMapper primary() {...}

    @Bean
    ObjectMapper qualified(){...}

    @Bean
    ObjectMapper resulted(ObjectMapper primary, 
                         @Autowired(required = false)  @Qualifier("qualified") ObjectMapper qualified){
       return qualified == null ? primary : qualified;
    }
}

并将其用作:

@Service
class MyService {
    MyService(@Qualifier("resulted") ObjectMapper mapper) {...}
}

试试这个

    @Autowired
private ApplicationContext applicationContext;

@Autowired
private ObjectMapper objectMapper;

    try {
    ObjectMapper obj = applicationContext.getBean("qualifiedObjectMapper");
    //use qualifier
}catch(Exception e) {
    //use objectMapper
}