spring bean中构造函数，afterPropertiesSet和init-method的执行顺序

http://blog.csdn.net/super_ccc/article/details/50728529

1.xml文件

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<bean id="aaa" class="com.dingwang.Test.Aaa" init-method="init">

<constructor-arg name="name" value="ddd"></constructor-arg>

</bean>

2.java文件

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public Aaa(String name) {

LOGGER.warn("--------------------Aaa-----------------Aaa");

this.setName(name);

}

public void init() {

LOGGER.warn("--------------------Aaa-----------------init");

}

/*

* (non-Javadoc)

* @see

* org.springframework.beans.factory.InitializingBean#afterPropertiesSet()

*/

@Override

public void afterPropertiesSet() throws Exception {

LOGGER.warn("--------------------Aaa-----------------afterPropertiesSet");

}

3.执行日志

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10:44:54.116 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean 'aaa'

10:44:54.157 [main] WARN com.dingwang.Test.Aaa - --------------------Aaa-----------------Aaa

10:44:54.159 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean 'aaa' to allow for resolving potential circular references

10:44:54.171 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking afterPropertiesSet() on bean with name 'aaa'

10:44:54.172 [main] WARN com.dingwang.Test.Aaa - --------------------Aaa-----------------afterPropertiesSet

10:44:54.172 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking init method 'init' on bean with name 'aaa'

10:44:54.172 [main] WARN com.dingwang.Test.Aaa - --------------------Aaa-----------------init

10:44:54.173 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Finished creating instance of bean 'aaa'

4.结论

执行顺序：构造函数>afterPropertiesSet>init-method

Person类

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public class Person {

private int i = 0;

public Person(){

System.out.println("实例化一个对象");

}

public void init(){

System.out.println("调用初始化方法....");

}

public void destory222(){

System.out.println("调用销毁化方法....");

}

}

applicationContext.xml

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<?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-2.5.xsd">
<!-- 配置初始化方法和销毁方法，但是如果要销毁方法生效scope="singleton" -->

<bean id="person" class="com.xxc.initAndDestory.domain.Person" scope="singleton" lazy-init="false" init-method="init" destroy-method="destory"></bean>

</beans>

测试类：

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public class Test {

public static void main(String[] args) {

//如果要调用销毁方法必须用子类来声明,而不是ApplicationContext,因为ApplicationContext没有close()

ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("com/xxc/initAndDestory/applicationContext.xml");

Person p1 = (Person)ac.getBean("person");

Person p2 = (Person)ac.getBean("person");

ac.close();

}

}

如果用注解方式配置：

applicationContext.xml

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<?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"

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config/>

<!-- scope默认是 prototype:getBean()一次创建一个实例-->

<bean id="person" class="com.xxc.initAndDestory.domain.Person"></bean>

</beans>

Person类

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public class Person {

private int i = 0;

public Person(){

System.out.println("实例化一个对象");

}

@PostConstruct //初始化方法的注解方式 等同与init-method=init

public void init(){

System.out.println("调用初始化方法....");

}

@PreDestroy //销毁方法的注解方式 等同于destory-method=destory222

public void destory(){

System.out.println("调用销毁化方法....");

}

}