本文介绍了@Qualifier和@Resource之间的区别的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我认为两种方式之间没有任何区别, @Qualifier 总是与 @Autowired 一起使用。

I don’t see any difference between two ways, @Qualifier is always used with @Autowired.

@Autowired
@Qualifier("alpha")

VS

@Resource(name="alpha")

任何人都可以告诉我这个区别吗?谢谢!

Anyone could let me know the difference? Thanks!

推荐答案

@Autowired 可以单独使用。如果单独使用,它将按类型连接。因此,如果在容器中声明了多个相同类型的bean,则会出现问题,因为 @Autowired 不知道要使用哪个bean来注入。因此,使用 @Qualifier @Autowired 一起,通过指定bean名称来阐明实际连接的bean (按姓名连线)

@Autowired can be used alone . If it is used alone , it will be wired by type . So problems arises if more than one bean of the same type are declared in the container as @Autowired does not know which beans to use to inject. As a result , use @Qualifier together with @Autowired to clarify which beans to be actually wired by specifying the bean name (wired by name)

@Resource 也按姓名连线。因此,如果 @Autowired @Qualifier 一起使用,则它与 @相同资源

@Resource is wired by name too . So if @Autowired is used together with @Qualifier , it is the same as the @Resource.

区别在于 @Autowired @Qualifier 是弹簧注释,而 @Resource 是标准的java注释(来自JSR-250)。此外, @Resource 仅支持字段和setter注入,而 @Autowired 支持字段,setter,构造函数和多参数方法注入。

The difference are that @Autowired and @Qualifier are the spring annotation while @Resource is the standard java annotation (from JSR-250) . Besides , @Resource only supports for fields and setter injection while @Autowired supports fields , setter ,constructors and multi-argument methods injection.

建议使用 @Resource 进行字段和setter注入。坚持使用 @Qualifier @Autowired 进行构造函数或多参数方法注入。

It is suggested to use @Resource for fields and setter injection. Stick with @Qualifier and @Autowired for constructor or a multi-argument method injection.

参见:

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09-23 16:58