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spring Bean的作用域和生命周期

2024-01-03 58

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简介： spring Bean的作用域和生命周期

两种方式初始化：

1、配置文件 init-method

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="roleService" class="com.xxx.service.RoleService" init-method="init"/>
</beans>

*/
public class RoleService {
    public RoleService() {
        System.out.println("RoleService 构造方法被初始化了....");
    }
    public void test(){
        System.out.println("RoleService test()....");
    }
    public void init(){
        System.out.println("RoleService init().....");
    }
}

运行结果

RoleService 构造方法被初始化了....
RoleService init().....
RoleService test()....
Disconnected from the target VM, address: '127.0.0.1:53138', transport: 'socket'
Process finished with exit code 0

2、实现接口 InitializingBean

@Service
public class RoleService implements InitializingBean {
    public RoleService() {
        System.out.println("RoleService 构造方法被初始化了....");
    }
    public void test(){
        System.out.println("RoleService test()....");
    }
    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("RoleService afterPropertiesSet().....");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.xxx"/>
</beans>

运行结果

RoleService 构造方法被初始化了....
RoleService test()....
Disconnected from the target VM, address: '127.0.0.1:53158', transport: 'socket'
Process finished with exit code 0