SpringApplication详解

更换source

public class SpringApplicationBootstrap {

    public static void main(String[] args) {
//        SpringApplication.run(ApplicationConfiguration.class,args);

        Set<String> sources = new HashSet();
        // 配置Class 名称
        sources.add(ApplicationConfiguration.class.getName());
        SpringApplication springApplication = new SpringApplication();
        springApplication.setSources(sources);
        springApplication.run(args);

    }

    @SpringBootApplication
    public static class ApplicationConfiguration {

    }

}

ApplicationContextInitializer

spring.factories

# ApplicationContextInitializer 实现配置
org.springframework.context.ApplicationContextInitializer=\
com.imooc.diveinspringboot.context.AfterHelloWorldApplicationContextInitializer,\
com.imooc.diveinspringboot.context.HelloWorldApplicationContextInitializer

public class AfterHelloWorldApplicationContextInitializer implements ApplicationContextInitializer, Ordered {

    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        System.out.println("After application.id = " + applicationContext.getId());
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

@Order(Ordered.HIGHEST_PRECEDENCE)
public class HelloWorldApplicationContextInitializer<C extends ConfigurableApplicationContext>
        implements ApplicationContextInitializer<C> {
    @Override
    public void initialize(C applicationContext) {
        System.out.println("ConfigurableApplicationContext.id = "+ applicationContext.getId());
    }
}

public class AfterHelloWorldApplicationContextInitializer implements ApplicationContextInitializer, Ordered {

    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        System.out.println("After application.id = " + applicationContext.getId());
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

event

spring.factories

# ApplicationListener 实现配置
org.springframework.context.ApplicationListener=\
com.imooc.diveinspringboot.listener.AfterHelloWorldApplicationListener,\
com.imooc.diveinspringboot.listener.HelloWorldApplicationListener,\
com.imooc.diveinspringboot.listener.BeforeConfigFileApplicationListener

public class SpringApplicationEventBootstrap {

    public static void main(String[] args) {
        // 创建上下文
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();

        // 注册应用事件监听器
        context.addApplicationListener(event -> {
            System.out.println("监听到事件: " + event);
        });

        // 启动上下文
        context.refresh();
        // 发送事件
        context.publishEvent("HelloWorld");
        context.publishEvent("2018");
        context.publishEvent(new ApplicationEvent("小马哥") {

        });

        // 关闭上下文
        context.close();
    }
}

public class AfterHelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent>,Ordered {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("AfterHelloWorld : " + event.getApplicationContext().getId()
                + " , timestamp : " + event.getTimestamp());
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}

public class BeforeConfigFileApplicationListener implements SmartApplicationListener, Ordered {


    @Override
    public int getOrder() { // 比 ConfigFileApplicationListener 优先级更高
        return ConfigFileApplicationListener.DEFAULT_ORDER - 1;
    }

    @Override
    public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
        return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(eventType)
                || ApplicationPreparedEvent.class.isAssignableFrom(eventType);
    }

    @Override
    public boolean supportsSourceType(Class<?> aClass) {
        return true;
    }

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        if (event instanceof ApplicationEnvironmentPreparedEvent) {
            ApplicationEnvironmentPreparedEvent preparedEvent = (ApplicationEnvironmentPreparedEvent) event;
            Environment environment = preparedEvent.getEnvironment();
            System.out.println("environment.getProperty(\"name\") : " + environment.getProperty("name"));
        }
        if (event instanceof ApplicationPreparedEvent) {
        }
    }
}

@Order(Ordered.HIGHEST_PRECEDENCE)
public class HelloWorldApplicationListener implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("HelloWorld : " + event.getApplicationContext().getId()
                + " , timestamp : " + event.getTimestamp());
    }
}