Java Spring 中的动态 @Value 等效项？
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Dynamic @Value-equivalent in Spring?
提问by Doches
I have a Spring-managed bean that loads properties using a property-placeholderin its associated context.xml:
我有一个 Spring 管理的 bean，property-placeholder它在其关联的 中使用 a 加载属性context.xml：
<context:property-placeholder location="file:config/example.prefs" />
I can access properties using Spring's @Valueannotations at initialisation, e.g.:
我可以@Value在初始化时使用 Spring 的注释访问属性，例如：
@Value("${some.prefs.key}")
String someProperty;
...but I need to expose those properties to other (non-Spring managed) objects in a generic way. Ideally, I could expose them through a method like:
...但我需要以通用方式将这些属性公开给其他（非 Spring 管理的）对象。理想情况下，我可以通过以下方法公开它们：
public String getPropertyValue(String key) {
@Value("${" + key + "}")
String value;
return value;
}
...but obviously I can't use the @Valueannotation in that context. Is there some way I can access the properties loaded by Spring from example.prefsat runtime using keys, e.g.:
...但显然我不能@Value在这种情况下使用注释。有什么方法可以example.prefs在运行时使用键访问 Spring 加载的属性，例如：
public String getPropertyValue(String key) {
return SomeSpringContextOrEnvironmentObject.getValue(key);
}
回答by Sangam Belose
Autowire the Environment object in your class. Then you will be able to access the properties using environment.getProperty(propertyName);
自动装配类中的 Environment 对象。然后您将能够使用 environment.getProperty(propertyName); 访问属性。
@Autowired
private Environment environment;
// access it as below wherever required.
environment.getProperty(propertyName);
Also add @PropertySource on Config class.
还要在 Config 类上添加 @PropertySource。
@Configuration
@PropertySource("classpath:some.properties")
public class ApplicationConfiguration
回答by Wilson Campusano
inject BeanFactory into your bean.
将 BeanFactory 注入到你的 bean 中。
@Autowired
BeanFactory factory;
then cast and get the property from the bean
然后投射并从 bean 中获取属性
((ConfigurableBeanFactory) factory).resolveEmbeddedValue("${propertie}")
