网上中文资料都说@Resource是byName注入，其实是byType注入

网上中文资料都说@Resource是byName注入，其实是byType注入。以讹传讹，有时候真的不靠谱啊。

 

http://www.coderanch.com/t/478706/Spring/Autowired-Qualifier-Resource-annotation

posted Saturday, January 16, 2010 03:28:53

@Autowired is Spring's Annotation(only usable in Spring) 
@Resource is JSR-250 Common Annotation equivalent (works the same in Java EE 5) 
@Inject is JSR 33? Common Annotation equivalent. (works the same in Java EE 6?) 

All three do the same thing. However, @Autowired is the only annotation of the three that you can put on constructors. 

Now since auto wiring by default does it by object type. If you have two beans of the same type, then there is ambiguity that Spring can't figure out which of the two beans to inject. That is what @Qualifier is for, to use the bean name to fix the ambiguity and tell Spring which of the two beans to inject. Use @Qualifier with @Autowired. With @Resource and @Inject you can just put the bean name in the annotation as an attribute. 

Hope that helps 

Mark

验证了一下，还真是byType注入。

评论

3 楼 宇落YL 2015-05-16  

是byName
指定type时byType 指定name时byName
两个都指定时，找到type和name都符合条件的bean
不指定时默认就是byName

2 楼 llade 2012-03-29  

freeroy 写道

resource 传入name属性后，就是按名注入了

对的，我说的是默认情况。

1 楼 freeroy 2012-03-29  

resource 传入name属性后，就是按名注入了