@Resource vs @Autowired [英] @Resource vs @Autowired

问题描述

哪个注释 @Resource （ jsr250 ）或 @Autowired （Spring特定）应该在使用DI时使用？

我已经成功地使用了两者， @Resource（name =blah）和 @Autowired @Qualifier（blah）

我的直觉是坚持使用 @Resource 标签，因为它已被jsr人批准。任何人都有强烈的想法？

解决方案

在春季前3.0中，哪一个不重要。

在春季3.0中，支持标准（ JSR-330 ）注释 @ javax.inject.Inject - 使用它，结合 @Qualifier 。请注意，spring现在还支持 @ javax.inject.Qualifier 元注释：

  @Qualifier 
 @Retention（RUNTIME）
 public @interface YourQualifier {} 
  

所以你可以有

 < bean class =com.pkg.SomeBean> 
< qualifier type =YourQualifier/> 
< / bean> 
  

或

  @YourQualifier 
 @Component 
 public class SomeBean实现Foo {..} 
  

然后：

  @Inject @YourQualifier private Foo foo; 
  

这样可以减少使用字符串名称，这可能是拼写错误的，难以维护。 p>

---

对于原始问题：两者，没有指定注释的任何属性，请按类型执行注入。区别在于：

• @Resource 允许您指定注入的名称bean


• @Autowired 允许您将其标记为非强制性。

Which annotation, @Resource (jsr250) or @Autowired (Spring specific) should I be using when using DI?

I have successfully used both in the past, @Resource(name="blah") and @Autowired @Qualifier("blah")

My instinct is to stick with the @Resource tag since it's been ratified by the jsr people. Anyone have strong thoughts on this?

解决方案

In spring pre-3.0 it doesn't matter which one.

In spring 3.0 there's support for the standard (JSR-330) annotation @javax.inject.Inject - use it, with a combination of @Qualifier. Note that spring now also supports the @javax.inject.Qualifier meta-annotation:

@Qualifier
@Retention(RUNTIME)
public @interface YourQualifier {}

So you can have

<bean class="com.pkg.SomeBean">
   <qualifier type="YourQualifier"/>
</bean>

or

@YourQualifier
@Component
public class SomeBean implements Foo { .. }

And then:

@Inject @YourQualifier private Foo foo;

This makes less use of String-names, which can be misspelled and are harder to maintain.

---

As for the original question: both, without specifying any attributes of the annotation, perform injection by type. The difference is:

• @Resource allows you to specify a name of the injected bean
• @Autowired allows you to mark it as non-mandatory.

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