从application.yml设置类级别的注释值 [英] Setting class level annotation values from application.yml

问题描述

我试图使用allication.yaml来外部化类级别注释的配置.但是春天并没有加载正确的时间.任何想法如何做到这一点?

I was trying to externalise my configuration of a class level annotation using allication.yaml. But the spring is not loading it right. Any idea how to do this ?

这是我正在设置的服务类别

Here is my Service classI am trying to set

   @Service
   @DefaultProperties(threadPoolProperties = {
        @HystrixProperty(name = "coreSize", value = 
   "${cyclone.hystrix.lease.thread.coreSize}") })
    public class LeaseService {

   } 

和application.yml

And application.yml

cyclone:
  hystrix:
    lease: 
      thread:
        coreSize: 10

遇到错误-

java.lang.IllegalArgumentException: bad property value. property name 'coreSize'. Expected int value, actual = ${cyclone.hystrix.lease.thread.coreSize} 

我可以使用@Value("$ {cyclone.hystrix.lease.thread.coreSize}")加载相同的属性.但无法处理上述情况. 任何有关如何正确配置此配置的帮助?

I can load the same property using @Value("${cyclone.hystrix.lease.thread.coreSize}"). But not working on the above mentioned case. Any help on how to properly configure this ?

推荐答案

为了使spring评估占位符，在使用@Configuration类时，需要使用静态@Bean方法注册PropertySourcesPlaceholderConfigurer bean，如下所示:

In order to make spring evaluate placeholders you need to register a PropertySourcesPlaceholderConfigurer bean using a static @Bean method when using @Configuration classes as follows:

@Bean 
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
return new PropertySourcesPlaceholderConfigurer();
}

根据 JavaDoc :

PlaceholderConfigurerSupport的专业化，可针对当前Spring Environment及其PropertySources集合解析Bean定义属性值和@Value注释内的$ {...}占位符.

Specialization of PlaceholderConfigurerSupport that resolves ${...} placeholders within bean definition property values and @Value annotations against the current Spring Environment and its set of PropertySources.

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