@Inject和@Autowired有什么区别

Question

i am just wondering what is the difference between @Inject & @Autowired when to use each one ?, or they are doing the same thing ?

and if i have a spring bean which have a scope:

@Service
@Scope("singleton")

can i make dependency injection for it with both with no problems ?

thanks in advance.

Answer 1

From what I know, they do the same. @Inject is an annotation from javax.inject, which is only the API for dependency injection. In Spring you can use both, as I think Spring provides an implementation for @Inject which does the same thing as @Autowired in Spring environments.

Matthias Wessendorf blogged about this here: http://matthiaswessendorf.wordpress.com/2010/04/20/spring-3-0-and-jsr-330-part-2/

Answer 2

How about reading the documentation ?

JSR 330's @Inject annotation can be used in place of Spring's @Autowired in the examples below. @Inject does not have a required property unlike Spring's @Autowired annotation which has a required property to indicate if the value being injected is optional. This behavior is enabled automatically if you have the JSR 330 JAR on the classpath.

Answer 3

我认为值得指出的是，如果使用@Autowired ，则将在Spring上创建依赖项，而使用@Inject ，则可以换出另一个支持JSR 330依赖项注入框架。

Answer 4

First , @Autowired is defined by Spring Framework but @Inject came from "Dependency Injection for Java" (JSR-330)"

Second , @Inject doesn't take required attribute so if it fails to find any bean, it will fail with an error but @Autowired can come with required=false and will allow a nullable field.

Third , Advantage of @Inject annotation is that rather than inject a reference directly, you could ask @Inject to inject a Provider. The Provider interface enables, among other things, lazy injection of bean references and injection of multiple instances of a bean.