java - 为什么 Autowiring 对于这个 Spring MVC String bean 属性不起作用？

Question

@Autowired
private String defaultLanguage;

当我尝试 @Autowire CountryBean 类的 defaultLanguage 字段时，如下所示:

<beans:bean id="countryBean" class="geoapp.CountryBean">
    <beans:property name="defaultLanguage" value="English" />
</beans:bean>

我收到此错误:

Error creating bean with name 'CountryBean': 
Injection of autowired dependencies failed; 
nested exception is 
org.springframework.beans.factory.BeanCreationException: 
Could not autowire field: 
private java.lang.String geoapp.CountryBean.defaultLanguage; 
nested exception is 
org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No matching bean of type [java.lang.String] found for dependency:
expected at least 1 bean which qualifies as autowire candidate for 
this dependency. 
Dependency annotations:
{@org.springframework.beans.factory.annotation.Autowired(required=true)}:

当它说没有找到依赖项的[java.lang.String]类型的匹配bean时，我想知道是否还需要说些什么来让它知道值English 是一个字符串？

Answer 1

由于您是通过 xml 显式指定属性值，因此不需要 AutoWired 注释。