自定义监听器

配置在META-INF/spring.factories

ApplicationContextInitializer

public class HelloApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        System.out.println("ApplicationContextInitializer...initialize..."+applicationContext);
    }
}

SpringApplicationRunListener

public class HelloSpringApplicationRunListener implements SpringApplicationRunListener {

    //必须有的构造器
    public MySpringApplicationRunListener(SpringApplication application,String[] args) {
    }

    @Override
    public void starting() {
        System.out.println("SpringApplicationRunListener------Starting--------");
    }

    @Override
    public void environmentPrepared(ConfigurableEnvironment environment) {
        System.out.println("SpringApplicationRunListener------environmentPrepared--------");
    }

    @Override
    public void contextPrepared(ConfigurableApplicationContext context) {
        System.out.println("SpringApplicationRunListener-----contextPrepared--------");
    }

    @Override
    public void contextLoaded(ConfigurableApplicationContext context) {
        System.out.println("SpringApplicationRunListener-----contextLoaded--------");
    }

    @Override
    public void started(ConfigurableApplicationContext context) {
        System.out.println("SpringApplicationRunListener------started--------");
    }

    @Override
    public void running(ConfigurableApplicationContext context) {
        System.out.println("SpringApplicationRunListener-----run--------");
    }

    @Override
    public void failed(ConfigurableApplicationContext context, Throwable exception) {
        System.out.println("SpringApplicationRunListener-----filed--------");

    }
}

配置（META-INF/spring.factories）

org.springframework.context.ApplicationContextInitializer=\
com.atguigu.springboot.listener.HelloApplicationContextInitializer

org.springframework.boot.SpringApplicationRunListener=\
com.atguigu.springboot.listener.HelloSpringApplicationRunListener

只需要放在ioc容器中

ApplicationRunner

@Component
public class HelloApplicationRunner implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println("ApplicationRunner...run....");
    }
}

CommandLineRunner

@Component
public class HelloCommandLineRunner implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("CommandLineRunner...run..."+ Arrays.asList(args));
    }
}

自定义Start

自动化配置需满足两个条件：

1. 能够生成 Bean，并注册到 Bean 容器中

2. 能够自动配置项目所需要的配置

3. 创建项目的时候先创建一个空白项目

2. 创建一个空白的Web项目，和一个SpringBoot的Web项目

3. 在Web项目的pom文件里添加依赖SpringBoot项目

4. 在SpringBoot工程中编写配置代码

5. 创建META-INF下的spring.factories

6. 安装到本地仓库

7. 创建一个新的SpringBoot工程测试，自动注入是成功的