@autowired on Spring中的方法 [英] @autowired on method in Spring
问题描述
我正在学习Spring,据我所知,当我们在具有通用名称的方法(不是setter方法)上使用@annotation时,该方法的参数将自动装配.
I am learning Spring, and as far as I understand, when we use @annotation on a method which has a generic name (not a setter method), then the method's arguments are autowired.
public class MovieRecommender {
private MovieCatalog movieCatalog;
private CustomerPreferenceDao customerPreferenceDao;
@Autowired
public void prepare(MovieCatalog mC,
CustomerPreferenceDao cPD) {
this.movieCatalog = mC;
this.customerPreferenceDao = cPD;
}
// ...
}
因此,在这里,字段 movieCatalog 和 customerPreferenceDao 与 mC 和 cPD 的值自动关联.我无法理解的是,这与没有" @autowired "的相同方法有何不同.
So, here, the fields movieCatalog and customerPreferenceDao are autowired with the values of mC and cPD. What I fail to understand is how is this different from the same method without the "@autowired".
当将@autowired应用于字段名称时,我会理解@autowired,但无法理解何时将值显式传递给方法(setter或任何其他方法),那么Spring有什么特别之处?
I understand @autowired when applied to a Field name, but not able to understand when the values are explicitly being passed to the method (either a setter or any other method), then what does Spring do special?
推荐答案
答案很晚,但这是:
任何带有 @Autowired
注释的方法都是配置方法.字段注入完成后,将在bean实例化上调用它.该方法的参数会在调用时注入到方法中.
any method annotated with @Autowired
is a config method. It is called on bean instantiation after field injection is done. The arguments of the method are injected into the method on calling.
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