在控制器中注入属性值的最佳方法是什么？
这真的是从属性文件向控制器注入属性的最简单方法吗？然后，它需要在每个需要一些属性的控制器上导入属性文件内容。在像我这样的项目中，大约有 30 个控制器，其中 10 个控制器需要这个国家财产，我想这看起来会很混乱。 我是否正确理解了 @Value 的用法？
@Controller
@RequestMapping(value = "/simple")
@ImportResource("classpath:/META-INF/properties-config.xml")
public class SimpleController {
private @Value("#{exampleProperties['simple.country']}") String country;
}
properties-config.xml （跳过了 xml 和架构内容）
<beans>
<util:properties id="exampleProperties" location="classpath:/simple.properties" />
</beans>
另外，当尝试在多个控制器中导入properties-config.xml 资源时，我会收到此类消息。这似乎不是正确的做法，但我无法找出更好的方法..
01 Apr 2011 04:52:29,859 INFO org.springframework.beans.factory.support.DefaultListableBeanFactory []: Overriding bean definition for bean 'exampleProperties': replacing [Generic bean: class [org.springframework.beans.factory.config.PropertiesFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Generic bean: class [org.springframework.beans.factory.config.PropertiesFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
Is this really the easiest way how to inject a property in the controller from properties file? It then needs to import the property file stuff on each controller which needs some properties. In a project like mine with about 30 controllers and 10 of them needing this country property it would look like mess i guess..
Did I understand the usage of @Value correctly?
@Controller
@RequestMapping(value = "/simple")
@ImportResource("classpath:/META-INF/properties-config.xml")
public class SimpleController {
private @Value("#{exampleProperties['simple.country']}") String country;
}
properties-config.xml (skipped the xml and schema stuff)
<beans>
<util:properties id="exampleProperties" location="classpath:/simple.properties" />
</beans>
Also when trying to import the properties-config.xml resource in more than one controller I get such messages. It just doesn't seem the right way how to do it, but i can't figure out a better one..
01 Apr 2011 04:52:29,859 INFO org.springframework.beans.factory.support.DefaultListableBeanFactory []: Overriding bean definition for bean 'exampleProperties': replacing [Generic bean: class [org.springframework.beans.factory.config.PropertiesFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Generic bean: class [org.springframework.beans.factory.config.PropertiesFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
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我认为对于这种情况，你的方法过于复杂。典型的方法是使用
您在一个地方
，并在控制器中使用它的属性，我不认为以这种方式使用 @ImportResource 是一个好主意，它违反了依赖注入原则 - 这些属性是上下文的一部分您的控制器正在其中工作，因此控制器不应该知道它们是如何加载的。
I think your approach is overcomplicated for this case. The typical approach is to use
<context:property-placeholder>. You declarein a single place, and use its properties in controllers as
Also I don't think it's a good idea to use
@ImportResourcethis way, it violates Dependency Injection principle - these properties are parts of context in which your controllers are working, therefore controllers shouldn't know how they are loaded.