此版本仍在开发中,尚不被认为是稳定的。对于最新的稳定版本,请使用 Spring Framework 6.2.10spring-doc.cadn.net.cn

使用泛型作为自动装配限定符

除了@Qualifier注释,您可以使用 Java 泛型类型作为隐式限定形式。例如,假设您有以下内容 配置:spring-doc.cadn.net.cn

@Configuration
public class MyConfiguration {

	@Bean
	public StringStore stringStore() {
		return new StringStore();
	}

	@Bean
	public IntegerStore integerStore() {
		return new IntegerStore();
	}
}
@Configuration
class MyConfiguration {

	@Bean
	fun stringStore() = StringStore()

	@Bean
	fun integerStore() = IntegerStore()
}

假设前面的 bean 实现了一个泛型接口(即,Store<String>Store<Integer>),您可以@AutowireStore接口,泛型是用作限定符,如以下示例所示:spring-doc.cadn.net.cn

@Autowired
private Store<String> s1; // <String> qualifier, injects the stringStore bean

@Autowired
private Store<Integer> s2; // <Integer> qualifier, injects the integerStore bean
@Autowired
private lateinit var s1: Store<String> // <String> qualifier, injects the stringStore bean

@Autowired
private lateinit var s2: Store<Integer> // <Integer> qualifier, injects the integerStore bean

泛型限定符也适用于自动布线列表,Map实例和数组。 这 以下示例自动连接泛型List:spring-doc.cadn.net.cn

// Inject all Store beans as long as they have an <Integer> generic
// Store<String> beans will not appear in this list
@Autowired
private List<Store<Integer>> s;
// Inject all Store beans as long as they have an <Integer> generic
// Store<String> beans will not appear in this list
@Autowired
private lateinit var s: List<Store<Integer>>