Bean Scopes
官方文档
| 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 . Only valid in the context of a web-aware Spring .Session``ApplicationContext |
| application | Scopes a single bean definition to the lifecycle of a . Only valid in the context of a web-aware Spring .ServletContext``ApplicationContext |
| websocket | Scopes a single bean definition to the lifecycle of a . Only valid in the context of a web-aware Spring .WebSocket``ApplicationContext |
1.单例模式 （默认机制是单例）
代码实例（用的之前的beans.xml文件）
com.wjj.pojo.Student student =(Student) context.getBean("student");com.wjj.pojo.Student student2 =(Student) context.getBean("student");System.out.println(student.hashCode());System.out.println(student2.hashCode());System.out.println(student.equals(student2));2.圆形模式 (xml文件改动)
<bean id="student" class="com.wjj.pojo.Student" scope="prototype">