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@Scope 注解
目前我用到的就是 单列 singleton 和多例 prototype
Spring 默认的是单列 singleton
通常使用情况：
@Service 直接默认就行，所以不用加@Scope注解 顺便提醒一下，既然是单例。。。属性的值可是下一次访问还在哦
@Controller 控制层用多例 @Scope("prototype") 毕竟我们不想两个用户的访问结果互相串
如果有其它具体需求再具体分析
下面列出所有支持的类型：
| Scope | Description |
|---|---|
| singleton | (Default) Scopes a single bean definition to a single object instance for each Spring IoC container. |
| prototype | Scopes a single bean definition to any number of object instances. |
| request | Scopes a single bean definition to the lifecycle of a single HTTP request. That is, each HTTP request has its own instance of a bean created off the back of a single bean definition. Only valid in the context of a web-aware Spring ApplicationContext. |
| session | Scopes a single bean definition to the lifecycle of an HTTP Session. Only valid in the context of a web-aware Spring ApplicationContext. |
| application | Scopes a single bean definition to the lifecycle of a ServletContext. Only valid in the context of a web-aware Spring ApplicationContext. |
| websocket | Scopes a single bean definition to the lifecycle of a WebSocket. Only valid in the context of a web-aware Spring ApplicationContext. |