自动装配发生的时间比
load()所谓的晚（由于某种原因）。
一种解决方法是实现
EnvironmentAware并依赖Spring调用
setEnvironment()方法：
@Configuration@ComponentScan(basePackages = "my.pack.offer.*")@PropertySource("classpath:OfferService.properties")public class PropertiesUtil implements EnvironmentAware { private Environment environment; @Override public void setEnvironment(final Environment environment) { this.environment = environment; } @Bean public String load(String propertyName) { return environment.getRequiredProperty(propertyName); }}
