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

[html] view plain copy

print?

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

2.java文件

[java] view plain copy

print?

1. public Aaa(String name) {
2. LOGGER.warn("--------------------Aaa-----------------Aaa");
3. this.setName(name);
4. }
5. public void init() {
6. LOGGER.warn("--------------------Aaa-----------------init");
7. }
8. /*
9. * (non-Javadoc)
10. * @see
11. * org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
12. */
13. @Override
14. public void afterPropertiesSet() throws Exception {
15. LOGGER.warn("--------------------Aaa-----------------afterPropertiesSet");
16. }

3.执行日志

[plain] view plain copy

print?

1. 10:44:54.116 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Creating instance of bean ‘aaa‘
2. 10:44:54.157 [main] WARN  com.dingwang.Test.Aaa - --------------------Aaa-----------------Aaa
3. 10:44:54.159 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Eagerly caching bean ‘aaa‘ to allow for resolving potential circular references
4. 10:44:54.171 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking afterPropertiesSet() on bean with name ‘aaa‘
5. 10:44:54.172 [main] WARN  com.dingwang.Test.Aaa - --------------------Aaa-----------------afterPropertiesSet
6. 10:44:54.172 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking init method  ‘init‘ on bean with name ‘aaa‘
7. 10:44:54.172 [main] WARN  com.dingwang.Test.Aaa - --------------------Aaa-----------------init
8. 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

[java] view plain copy

print?

1. public class Person {
2. private int i = 0;
3. public Person(){
4. System.out.println("实例化一个对象");
5. }
6. public void init(){
7. System.out.println("调用初始化方法....");
8. }
9. public void destory222(){
10. System.out.println("调用销毁化方法....");
11. }
12. }

applicationContext.xml

[html] view plain copy

print?

1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4. xsi:schemaLocation="http://www.springframework.org/schema/beans
5. http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
6. <!-- 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" -->
7. <bean id="person" class="com.xxc.initAndDestory.domain.Person" scope="singleton" lazy-init="false" init-method="init" destroy-method="destory"></bean>
8. </beans>

测试类：

[java] view plain copy

print?

1. public class Test {
2. public static void main(String[] args) {
3. //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()
4. ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("com/xxc/initAndDestory/applicationContext.xml");
5. Person p1 = (Person)ac.getBean("person");
6. Person p2 = (Person)ac.getBean("person");
7. ac.close();
8. }
9. }

如果用注解方式配置：

applicationContext.xml

[html] view plain copy

print?

1. <?xml version="1.0" encoding="UTF-8"?>
2. <beans xmlns="http://www.springframework.org/schema/beans"
3. xmlns:context="http://www.springframework.org/schema/context"
4. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5. xsi:schemaLocation="http://www.springframework.org/schema/beans
6. http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
7. http://www.springframework.org/schema/context
8. http://www.springframework.org/schema/context/spring-context-2.5.xsd">
9. <context:annotation-config/>
10. <!-- scope默认是 prototype:getBean()一次创建一个实例-->
11. <bean id="person" class="com.xxc.initAndDestory.domain.Person"></bean>
12. </beans>

Person类

[java] view plain copy

print?

1. public class Person {
2. private int i = 0;
3. public Person(){
4. System.out.println("实例化一个对象");
5. }
6. @PostConstruct //初始化方法的注解方式  等同与init-method=init
7. public void init(){
8. System.out.println("调用初始化方法....");
9. }
10. @PreDestroy //销毁方法的注解方式  等同于destory-method=destory222
11. public void destory(){
12. System.out.println("调用销毁化方法....");
13. }
14. }