Java Spring -- 注入 2 个相同类型的 bean
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Spring -- inject 2 beans of same type
提问by Guillaume
I like constructor-based injection as it allows me to make injected fields final. I also like annotation driven injection as it simplifies my context.xml. I can mark my constructor with @Autowiredand everything works fine, as long as I don't have two parameters of the same type. For example, I have a class:
我喜欢基于构造函数的注入，因为它允许我创建注入的字段final。我也喜欢注释驱动的注入，因为它简化了我的context.xml. 我可以标记我的构造函数@Autowired并且一切正常，只要我没有两个相同类型的参数。例如，我有一个类：
@Component
public class SomeClass {
@Autowired(required=true)
public SomeClass(OtherClass bean1, OtherClass bean2) {
…
}
}
and an application context with:
以及具有以下内容的应用程序上下文：
<bean id="bean1" class="OtherClass" />
<bean id="bean2" class="OtherClass" />
There should be a way to specify the bean ID on the constructor of the class SomeClass, but I can't find it in the documentation. Is it possible, or am I dreaming of a solution that does not exist yet?
应该有一种方法可以在 class 的构造函数上指定 bean ID SomeClass，但是我在文档中找不到它。是否有可能，或者我是否梦想一个尚不存在的解决方案？
采纳答案by Bozho
@Autowiredis by-type (in this case); use @Qualifierto autowire by-name, following the example from spring docs:
@Autowired是按类型（在这种情况下）；用于@Qualifier按名称自动装配，遵循spring 文档中的示例：
public SomeClass(
@Qualifier("bean1") OtherClass bean1,
@Qualifier("bean2") OtherClass bean2) {
...
}
Note: In contrast to @Autowired which is applicable to fields, constructors and multi-argument methods (allowing for narrowing through qualifier annotations at the parameter level), @Resource is only supported for fields and bean property setter methods with a single argument. As a consequence, stick with qualifiers if your injection target is a constructor or a multi-argument method.
注意：与适用于字段、构造函数和多参数方法（允许在参数级别通过限定符注释进行缩小）的 @Autowired 相比，@Resource 仅支持具有单个参数的字段和 bean 属性 setter 方法。因此，如果您的注入目标是构造函数或多参数方法，请坚持使用限定符。
(below that text is the full example)
（在该文本下方是完整示例）
