【Spring Framework】6、bean的作用域

https://www.bilibili.com/video/BV1WE411d7Dv?t=334&p=11

1、singleton

单例模式（Spring 默认的）：singleton

<bean id="user" class="com.xg.pojo.User" p:name="遇见星光" scope="singleton"/>

@Test
public void userTest() {
   ApplicationContext context = new ClassPathXmlApplicationContext("userBeans.xml");
   User user = context.getBean("user", User.class);
   User user2 = context.getBean("user", User.class);

   System.out.println(user==user2);
}

2、prototype

原型模式：prototype，每次从容器中获取的都会是一个新对象

<bean id="user" class="com.xg.pojo.User" p:name="遇见星光" scope="prototype"/>

@Test
public void userTest() {
   ApplicationContext context = new ClassPathXmlApplicationContext("userBeans.xml");
   User user = context.getBean("user", User.class);
   User user2 = context.getBean("user", User.class);

   System.out.println(user==user2);
}

3、request，session，application

其余的 request，session，application、只能在web开发中使用