可以在 BeanDefinitionRegistryPostProcessor 实现类中调用 PropertySourcesUtils 中的 resolvePlaceholders 方法，手动解析属性中的加密值。具体代码示例如下：

@Configuration public class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {

@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    // Do nothing
}

@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
    StringEncryptor encryptor = new MyEncryptor(); // 自定义的加密类
    StringPropertyValueResolver resolver = new StringPropertyValueResolver() {
        @Override
        protected String resolveStringValue(String strVal) throws BeansException {
            if (strVal != null && strVal.startsWith("{cipher}")) {
                String cipherText = strVal.substring("{cipher}".length());
                return encryptor.decrypt(cipherText);
            }
            return strVal;
        }
    };
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    MutablePropertySources propertySources = new MutablePropertySources();
    propertySources.addFirst(new MapPropertySource("myProps", new HashMap<>()));
    configurer.setPropertySources(propertySources);
    configurer.setPlaceholderPrefix("$(");
    configurer.setPlaceholderSuffix(")");
    configurer.setIgnoreUnresolvablePlaceholders(true);
    configurer.setValueSeparator(":");
    configurer.setSystemPropertiesMode(PropertySourcesPlaceholderConfigurer.SYSTEM_PROPERTIES_MODE_OVERRIDE);
    configurer.setPropertyValues(new MutablePropertyValues())
    configurer.setPropertiesPersister(new DefaultPropertiesPersister());
    PropertySourcesUtils.addPlaceholders(propertySources, configurer);
    ResolvableType resolvableType = ResolvableType.forClass(StringValueResolver.class);
    registry.registerBeanDefinition("myResolver", BeanDefinitionBuilder.rootBeanDefinition(ResolverType.class)
            .addConstructorArgValue(resolver)
            .setFactoryMethod("resolvableAt", resolvableType)
            .getBeanDefinition());
}

}

其中，MyEncryptor 是自定义的加密类，实现了 StringEncryptor 接口。调用 resolver 的 resolveStringValue 方法可以手动解析属性中的加密值，将其解密后返回。在 propertySources 中添加自定义的