Bean's life cycle scope in spring

Within a bean's configuration you can specify a property scope, which is the bean's scope, the bean's life cycle.

Scope desirable values 5 kinds: Singleton ( default ), prototype, request, session, global session

Among the most commonly used are: Singleton and prototype, and the other three are web-related and rarely used.

Singleton: This is the singleton mode. Indicates that the bean is a singleton pattern, and each fetch is the same bean

Prototype: multiple cases, that is, every time you get a new object, use the scene: you need to set it to prototype on the action

For example: User This bean, the default scope property we are not configured, that is, Singleton mode

123456

<bean name="user" class="com.fz.entity.User" >    <property name="id" value="1"></property>    <property name="username" value="fangzheng"></property>    <property name="password" value="123456"></property>    <property name="role" ref="role"></property></bean>

Test Singleton, the result is true

1234567

@Testpublic void getProperties(){    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");    User user1 = (User) ctx.getBean("user");    User user2 = (User) ctx.getBean("user");    System.out.println(user1 == user2);//结果为true    }

Add Scope=prototype

After adding Scope=prototype to <bean>.

123456

<bean name="user" class="com.fz.entity.User" scope="prototype">    <property name="id" value="1"></property>    <property name="username" value="fangzheng"></property>    <property name="password" value="123456"></property>    <property name="role" ref="role"></property></bean>

Test prototype, the result is false

1234567

@Testpublic void getProperties(){    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");    User user1 = (User) ctx.getBean("user");    User user2 = (User) ctx.getBean("user");    System.out.println(user1 == user2);//结果为false}

From for notes (Wiz)

Bean's life cycle scope in spring