Java Spring属性资源占位符配置器bean：在运行时解析属性值

我正在加载具有多个

propertysourcesplaceplaceconfigurer

bean的属性，并设置占位符前缀es：

@Bean
public static PropertySourcesPlaceholderConfigurer fooPropertyConfigurer() {
    PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer = new PropertySourcesPlaceholderConfigurer();
    propertySourcesPlaceholderConfigurer.setLocation(new ClassPathResource("foo.properties"));
    propertySourcesPlaceholderConfigurer.setIgnoreResourceNotFound(true);
    propertySourcesPlaceholderConfigurer.setPlaceholderPrefix("$foo{");
    return propertySourcesPlaceholderConfigurer;
}

虽然我可以通过如下方式指定属性值的索引和键来注入属性值：

@Value("$foo{key}")
private String value;

有时我需要在运行时确定前缀（“foo”）的值，并动态解析属性值。这可能吗？如果没有，建议针对该用例使用哪些替代解决方案？

多亏了post，我找到了一个解决方案：

@Component
public class PropertyPlaceholderExposer implements BeanFactoryAware {  
    
    ConfigurableBeanFactory beanFactory; 

    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        this.beanFactory = (ConfigurableBeanFactory) beanFactory;
    }

    public String resolveProperty(String prefix, String key) {
        String rv = beanFactory.resolveEmbeddedValue("$" + prefix + "{" + key + "}");
        return rv;
    }

}

用法：

@Autowired
private PropertyPlaceholderExposer ppe;
    
{
    String v = ppe.resolveProperty("bar", "key");
}