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

<bean id="aaa" class="com.dingwang.Test.Aaa" init-method="init">
        <constructor-arg name="name" value="ddd"></constructor-arg>
    </bean>

2.java文件

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

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

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

<?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：

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

<?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

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....");
    }
}