java普通的类，利用内部类注入依赖的service

场景：在普通类或枚举类中（非Controller、Service类），需要调用service，查数据库等；

示例代码：

public class XXX {
    
    private static testService test = null;
    
    
    @Component
    public static class GetService{
        @Autowired
        private TestService testService;
        @PostConstruct
        private void getTestService(){
            XXX.test = testService;
        }
    }
    
}