Spring4.X之Constructor Injection 构造方法注入

Spring4.X之Constructor Injection 构造方法注入


With Spring Framework 4.3 it’s very easy to write components that use constructor injections as you no longer need to use @Autowired. As long as you have a single constructor, Spring will implicitly consider it an autowire target:


在 Spring4.x 中增加了新的特性：

如果类只提供了一个带参数的构造方法，则不需要对对其内部的属性写 @Autowired 注解，
Spring 会自动为你注入属性。

注意：
要被注入的Bean，需要在class前写上诸如 @Component，@Service 的注解。

@Component
public class MyComponent {
    
    private final SomeService service;

    public MyComponent(SomeService service) {
        this.service = service;
    }

} 

@Service
public class SomeService {

} 

引用：

https://spring.io/blog/2016/04/15/testing-improvements-in-spring-boot-1-4


































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