@value读取yml

您可以使用Spring框架提供的YamlPropertySourceLoader类来读取YAML文件。以下是一个示例：

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.core.io.support.PropertySourceFactory;
import org.springframework.core.io.support.ResourcePropertySource;
import org.springframework.core.io.support.YamlPropertySourceLoader;

import java.io.IOException;

@Configuration
@PropertySource(factory = YamlPropertySourceFactory.class, value = "classpath:config.yml")
public class Config {

    @Value("${foo.bar}")
    private String fooBar;

    public String getFooBar() {
        return fooBar;
    }

    public static class YamlPropertySourceFactory implements PropertySourceFactory {
        @Override
        public org.springframework.core.env.PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
            Resource yamlResource = new ClassPathResource(resource.getResource().getFilename());
            if (yamlResource.exists()) {
                return new ResourcePropertySource(name, loadYaml(yamlResource));
            }
            return null;
        }

        private org.springframework.core.env.PropertySource<?> loadYaml(Resource yamlResource) throws IOException {
            YamlPropertySourceLoader loader = new YamlPropertySourceLoader();
            org.springframework.core.env.PropertySource<?> propertySource = loader.load(yamlResource.getFilename(), yamlResource).get(0);
            return propertySource;
        }
    }
}

在这个示例中，我们使用@Configuration注释来指示这是一个配置类。我们还使用@PropertySource注释来指定要加载的YAML文件和它的位置。我们还使用@Value注释来注入foo.bar属性的值。最后，我们使用YamlPropertySourceLoader类来加载YAML文件。