Spring容器初始化方法的应用及注意对象

Posted 2020-12-12 TracyDemo

beans组件 里面default-init-method初始化方法加载，范围比较大，当没有此方法时不会报错,default-destroy-method销毁方法

bean组件里面init-method初始化无此方法，会报错，  destroy-method销毁方法，

    注意：1.销毁方法对scope=“prototype”多例模式无效

    2.AbstractApplicationContext可以关闭容器，可以调用close()方法，关闭容器，调用销毁方法

 

            Xml代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd"
default-init-method="initEmp" default-destroy-method="destroyEmp">

<bean id="emp" init-method="initEmp" destroy-method="destroyEmp" class="com.tracy.bean.Emp" scope="singleton" ></bean>
</beans>

测试

//bean组件的默认方式
    @Test
    public void beanInitTest() {
    AbstractApplicationContext appContext=new ClassPathXmlApplicationContext("com/tracy/xml/bean-init-destroy.xml");
       ApplicationContext app=new ClassPathXmlApplicationContext("com/tracy/xml/bean-init-destroy.xml");
        Emp emp=app.getBean("emp",Emp.class);
        System.out.print(emp);
        appContext.close();
     
    }

 

 

 

通过构造完成初始bean属性，可以通过初始化完成