方法：

在类中创建一个静态的bean对象，然后使用init方式初始化这个bean，这样就可以在静态方法中调用了

    @Service("idg")
    public class IDGenerator {
     
        @Autowired
        private IIDGeneratorDAO dao;
     
        private static IDGenerator generator;
     
        public void setDao(IIDGeneratorDAO dao) {
            this.dao = dao;
        }
     
        @PostConstruct
        public void init() {
            generator = this;
            generator.dao = this.dao;
        }
     
        @Transactional
        public static String getId() {
            return generator.dao.getId();
        }
     
        @Transactional
        public static String getId(String name) {
            return generator.dao.getId(name);
        }
}