@Autowired
private AliossBucketService aliossBucketService;
直接將值注入字段,使用this.aliossBucketService值不爲空
@Autowired
private AliossFileService(AliossBucketService aliossBucketService) {
this.aliossBucketService = aliossBucketService;
}
構造方法注入時,this.aliossBucketService爲空