spring boot 生命周期初探

1、MytestApplication

package com.gomepay;

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MytestApplication {
    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(MytestApplication.class);
        app.setBannerMode(Banner.Mode.OFF);
        app.addListeners(new ApplicationStartup());
        app.run(args);
    }
}

2、StartupOrder

package com.gomepay;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanNameAware;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.web.context.WebServerApplicationContext;
import org.springframework.boot.web.context.WebServerInitializedEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.web.context.ServletContextAware;

import javax.annotation.PostConstruct;
import javax.servlet.ServletContext;

@Configuration
public class StartupOrder {
    @Bean
    static BeanDefinitionRegistryPostProcessor beanPostProcessor(final ConfigurableEnvironment environment) {
        return new BeanDefinitionRegistryPostProcessor() {
            @Override
            public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
                System.out.println("======1.BeanDefinitionRegistryPostProcessor.postProcessBeanDefinitionRegistry()");
            }
            @Override
            public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
                System.out.println("======2.BeanDefinitionRegistryPostProcessor.postProcessBeanFactory()");
            }
        };
    }
    @PostConstruct
    private void init() {
        System.out.println("======3.@PostConstruct");
    }
    @Bean
    static ServletContextAware servletContextAware(final ConfigurableEnvironment environment)  {
        return new ServletContextAware() {
            @Override
            public void setServletContext(ServletContext servletContext) {
                System.out.println("======4.ServletContextAware.setServletContext()");
            }
        };
    }
    @Bean
    static BeanNameAware beanNameAware(final ConfigurableEnvironment environment) {
        return new BeanNameAware() {
            @Override
            public void setBeanName(String name) {
                environment.getProperty("app.info");
                System.out.println("======5.BeanNameAware.setBeanName()");
            }
        };
    }
    @Bean
    static ApplicationContextAware aware(final ConfigurableEnvironment environment) {
        return new ApplicationContextAware() {
            @Override
            public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
                System.out.println("======6.ApplicationContextAware.setApplicationContext()");
            }
        };
    }
    @Bean
    static InitializingBean initBean(final ConfigurableEnvironment environment) {
        return new InitializingBean() {
            @Override
            public void afterPropertiesSet() throws Exception {
                System.out.println("======7.InitializingBean.afterPropertiesSet()");
            }
        };
    }

    /**
     * 在tomcat启动成功时
     * @param event
     */
    @EventListener(WebServerInitializedEvent.class)
    public void onWebServerReady(WebServerInitializedEvent event) {
        System.out.println("======9.@EventListener(WebServerInitializedEvent.class)");
    }
    /**
     * 在spring boot应用启动后回调
     * @param context
     * @return
     */
    @Bean
    public ApplicationRunner runner(WebServerApplicationContext context) {
        return args -> {
            System.out.println("======10.ApplicationRunner");
        };
    }
}

class ApplicationStartup implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        ApplicationContext ac = event.getApplicationContext();
        //User user = ac.getBean(User.class);
        System.out.println("======8.ApplicationListener.onApplicationEvent()");
    }
}

输出日志：

13:57:38.764 DEBUG | Loading source class com.gomepay.MytestApplication
13:57:38.813 DEBUG | Activated activeProfiles prod
13:57:38.813 DEBUG | Loaded config file 'file:/D:/tutorial/springboot/mycode/springboot-24-01-dynamic-beans/target/classes/application.yml' (classpath:/application.yml)
13:57:38.813 DEBUG | Loaded config file 'file:/D:/tutorial/springboot/mycode/springboot-24-01-dynamic-beans/target/classes/application-prod.yml' (classpath:/application-prod.yml) for profile prod
13:57:38.814 DEBUG | Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@662b4c69
13:57:38.834 DEBUG | Creating shared instance of singleton bean 'org.springframework.context.annotation.internalConfigurationAnnotationProcessor'
13:57:38.844 DEBUG | Creating shared instance of singleton bean 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory'
13:57:38.899 DEBUG | Identified candidate component class: file [D: utorialspringbootmycodespringboot-24-01-dynamic-beans argetclassescomgomepayStartupOrder.class]
13:57:39.040 DEBUG | Found key 'spring.application.admin.enabled' in PropertySource 'configurationProperties' with value of type String
13:57:39.208 DEBUG | Found key 'spring.application.admin.enabled' in PropertySource 'configurationProperties' with value of type String
13:57:39.257 DEBUG | Creating shared instance of singleton bean 'beanPostProcessor'
13:57:39.263 DEBUG | Autowiring by type from bean name 'beanPostProcessor' via factory method to bean named 'environment'
======1.BeanDefinitionRegistryPostProcessor.postProcessBeanDefinitionRegistry()
======2.BeanDefinitionRegistryPostProcessor.postProcessBeanFactory()

13:57:39.334 DEBUG | Creating shared instance of singleton bean 'propertySourcesPlaceholderConfigurer'
13:57:39.337 DEBUG | Creating shared instance of singleton bean 'org.springframework.boot.context.properties.ConfigurationPropertiesBeanDefinitionValidator'

13:57:39.464 DEBUG | Autowiring by type from bean name 'servletWebServerFactoryCustomizer' via factory method to bean named 'server-org.springframework.boot.autoconfigure.web.ServerProperties'

13:57:39.637 INFO | Tomcat initialized with port(s): 8080 (http)
13:57:39.647 INFO | Initializing ProtocolHandler ["http-nio-8080"]
13:57:39.648 INFO | Starting service [Tomcat]

13:57:39.806 DEBUG | Mapping servlets: dispatcherServlet urls=[/]
13:57:39.822 DEBUG | Filter 'requestContextFilter' configured for use
13:57:39.822 DEBUG | Filter 'characterEncodingFilter' configured for use
13:57:39.822 DEBUG | Filter 'formContentFilter' configured for use
13:57:39.831 DEBUG | Creating shared instance of singleton bean 'mytestApplication'
13:57:39.832 DEBUG | Creating shared instance of singleton bean 'startupOrder'
======3.@PostConstruct
13:57:39.833 DEBUG | Creating shared instance of singleton bean 'servletContextAware'
13:57:39.833 DEBUG | Autowiring by type from bean name 'servletContextAware' via factory method to bean named 'environment'
======4.ServletContextAware.setServletContext()
13:57:39.834 DEBUG | Creating shared instance of singleton bean 'beanNameAware'
13:57:39.834 DEBUG | Autowiring by type from bean name 'beanNameAware' via factory method to bean named 'environment'
13:57:39.835 DEBUG | Found key 'app.info' in PropertySource 'configurationProperties' with value of type String
======5.BeanNameAware.setBeanName()
13:57:39.836 DEBUG | Creating shared instance of singleton bean 'aware'
13:57:39.836 DEBUG | Autowiring by type from bean name 'aware' via factory method to bean named 'environment'
======6.ApplicationContextAware.setApplicationContext()
13:57:39.837 DEBUG | Creating shared instance of singleton bean 'initBean'
13:57:39.837 DEBUG | Autowiring by type from bean name 'initBean' via factory method to bean named 'environment'
======7.InitializingBean.afterPropertiesSet()
13:57:39.838 DEBUG | Creating shared instance of singleton bean 'runner'

。。。

======8.ApplicationListener.onApplicationEvent()
13:57:40.147 DEBUG | Found key 'spring.liveBeansView.mbeanDomain' in PropertySource 'systemProperties' with value of type String
13:57:40.147 INFO | Starting ProtocolHandler ["http-nio-8080"]
13:57:40.170 INFO | Tomcat started on port(s): 8080 (http) with context path ''
======9.@EventListener(WebServerInitializedEvent.class)
13:57:40.173 INFO | Started MytestApplication in 1.852 seconds (JVM running for 4.396)
======10.ApplicationRunner
13:57:40.458 DEBUG | Found key 'local.server.port' in PropertySource 'server.ports' with value of type Integer