Java 如何在带有注释的 Spring 中按名称自动装配？
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时间：2020-08-11 17:32:34 来源:igfitidea点击:
How to autowire by name in Spring with annotations?
提问by Dims
I have several beans of the same class defined:
我定义了几个相同类的bean：
@Bean
public FieldDescriptor fullSpotField() {
FieldDescriptor ans = new FieldDescriptor("full_spot", String.class);
return ans;
}
@Bean
public FieldDescriptor annotationIdField() {
FieldDescriptor ans = new FieldDescriptor("annotationID", Integer.class);
return ans;
}
consequently when I autowire them
因此，当我自动装配它们时
@Autowired
public FieldDescriptor fullSpotField;
@Autowired
public FieldDescriptor annotationIdField;
I get an exception
我得到一个例外
NoUniqueBeanDefinitionException: No qualifying bean of type [...FieldDescriptor] is defined: expected single matching bean but found ...
How to autowire by name as it possible in XML config?
如何在 XML 配置中尽可能按名称自动装配？
采纳答案by Madhusudana Reddy Sunnapu
You can use @Qualifierto solve it.
你可以用@Qualifier它来解决。
In your case you can make:
在您的情况下，您可以：
@Bean(name="fullSpot")
// Not mandatory. If not specified, it takes the method name i.e., "fullSpotField" as qualifier name.
public FieldDescriptor fullSpotField() {
FieldDescriptor ans = new FieldDescriptor("full_spot", String.class);
return ans;
}
@Bean("annotationIdSpot")
// Same as above comment.
public FieldDescriptor annotationIdField() {
FieldDescriptor ans = new FieldDescriptor("annotationID", Integer.class);
return ans;
}
and subsequently you can inject using:
随后您可以使用以下方法注入：
@Autowired
@Qualifier("fullSpot")
public FieldDescriptor fullSpotField;
@Autowired
@Qualifier("annotationIdSpot")
public FieldDescriptor annotationIdField;
