本文主要是介绍Spring-BeanPostProcessor PostConstruct init InitializingBean 执行顺序,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
执行顺序探究
新建一个对象用于测试
@Component
public class Student implements InitializingBean {private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}/*** InitializingBean 提供的在属性设置之后执行的方法** @throws Exception*/@Overridepublic void afterPropertiesSet() throws Exception {System.out.println("====== Student afterPropertiesSet");}/*** 初始化方法用于配置 bean inti*/public void init() {System.out.println("====== afterPropertiesSet init");}/*** PostConstruct*/@PostConstructpublic void post() {System.out.println("====== Student PostConstruct");}}
新建一个TestBeanPostProcessor 实现 BeanPostProcessor
@Component
public class TestBeanPostProcessor implements BeanPostProcessor {@Overridepublic Object postProcessAfterInitialization(Object bean, String beanName) {System.out.println("======== Student postProcessAfterInitialization");return bean;}@Overridepublic Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {System.out.println("=============Student postProcessBeforeInitialization");return bean;}
}
通过注解的 方式进行测试
@Test
public void test3() {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext("com.liyong.learn");
Student bean = (Student) context.getBean("student");
System.out.println(String.format("ben is name{%s} age is {%s}", bean.getName(), bean.getAge()));
}
得到的结果如下:
总结PostProcessBeforeInitialization -> PostConstruct -> InitializingBean -> PostProcessAfterInitialization
通过Bean.xml的方式
<bean id="student" class="com.liyong.learn.Student" init-method="init"><property name="name" value="english"></property><property name="age" value="18"></property>
</bean>
<bean id="testBeanPostProcessor" class="com.liyong.learn.TestBeanPostProcessor"></bean>
@Test
public void test () {
// 指定XML路径
String path = "beans.xml";
// 创建DefaultListableBeanFactory工厂,这也就是Spring的基本容器
DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();
// 创建BeanDefinition阅读器
XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);
// 进行BeanDefinition注册流程
reader.loadBeanDefinitions(path);
beanFactory.addBeanPostProcessor((BeanPostProcessor) beanFactory.getBean("testBeanPostProcessor"));
// Bean实例创建流程
Student student = (Student) beanFactory.getBean("student");
System.out.println(String.format("bean attrs name {%s} age {%s}", student.getName(), student.getAge()));
}
执行结果如下:
总结PostProcessBeforeInitialization -> InitializingBean -> initMethod -> PostProcessAfterInitialization
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