Spring Boot 事件监听机制&测试

最新推荐文章于 2024-07-13 23:22:33 发布

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#Spring Boot #事件监听机制

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本文深入探讨了SpringBoot启动过程中的关键配置原理，包括ApplicationContextInitializer和SpringApplicationRunListener的使用，以及如何通过ApplicationRunner和CommandLineRunner执行启动后的任务。

可结合文章浏览：Spring Boot 启动配置原理

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，否则项目无法启动
    public HelloSpringApplicationRunListener(SpringApplication application, String[] args){

    }

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

    @Override
    public void environmentPrepared(ConfigurableEnvironment environment) {
        Object o = environment.getSystemProperties().get("os.name");
        System.out.println("SpringApplicationRunListener...environmentPrepared.."+o);
    }

    @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 finished(ConfigurableApplicationContext context, Throwable exception) {
        System.out.println("SpringApplicationRunListener...finished...");
    }
}

在项目路径下配置（META-INF/spring.factories）：

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

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

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));
    }
}

配置完成后，启动项目：