Spring creation object execution steps

spring life cycle

Note: ApplicationContext object, spring context object, according to this object you can obtain objects in spring.

package com.example.demo.service;

import com.sun.media.sound.SoftTuning;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Service
public class BeanUtils implements BeanNameAware, BeanFactoryAware, ApplicationContextAware, BeanPostProcessor, InitializingBean, DisposableBean {
    
    

    private StudentService studentService;

    private BeanFactory beanFactory;

    private ApplicationContext applicationContext;

    public BeanUtils() {
    
    
        System.out.println("执行了构造方法");
    }

    @Autowired
    public void setStudentService(StudentService studentService) {
    
    
        System.out.println("执行了依赖注入");
        this.studentService = studentService;
    }

    @Override
    public void setBeanName(String name) {
    
    
        System.out.println("执行setbeanName方法："+name);
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
    
    
        System.out.println("执行beanFactory方法："+beanFactory);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    
    
        this.applicationContext = applicationContext;
        System.out.println("获取applicationContest对象");
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
    
    
        System.out.println("执行postProcessBeforeInitialization方法");
        return null;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
    
    
        System.out.println("执行postProcessAfterInitialization方法");
        return null;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
    
    
        System.out.println("执行afterPropertiesSet方法");
    }

    @PostConstruct
    public void set(){
    
    
        System.out.println("执行了PostConstruct注解方法");
    }

    @Override
    public void destroy() throws Exception {
    
    
        System.out.println("执行了destroy注解方法");
    }
}

执行了构造方法=
执行了依赖注入
beanName：beanUtils
beanFactory：xxxx
获取applicationContest对象
执行了PostConstruct注解方法
执行afterPropertiesSet方法
执行postProcessBeforeInitialization方法
执行postProcessAfterInitialization方法