spring - Kotlin : Optional Dependency Injection Using Spring

Question

什么是 kotlin 替代品

@Autowired(required=false)
private DependencyC dependencyC;

和

private Optional<HelloService> optionalHelloService;
public HelloController(Optional<HelloService> helloService) {
    this.optionalHelloService = helloService;
}

Answer 1

然后您应该使该属性可为空:

class HelloController(
    @Autowired(required = false) val helloService: HelloService?
)