SpringBoot 2.x Bean生命周期和常用注解

一、@ConfigurationProperties和@EnableConfigurationProperties

加载配置到配置类
springboot启动时默认加载application.properties->@ConfigurationProperties(prefix = "local") ->@EnableConfigurationProperties(Local.class)

// application.properties 中以 local 开头的配置与 Local 实体类进行绑定
@ConfigurationProperties(prefix = "local")
public class Local {
   
   
    private String host;
    private String port;
    ... 省略 get / set / toString 方法
}

//注解只要能加入到 IOC 容器中,不一定要在启动类上
@EnableConfigurationProperties(Local.class)
public class Springboot01Application {
   
   
    public static void main(String[] args) {
   
   
        ConfigurableApplicationContext ioc = SpringApplication.run(Springboot01Application.class, args);
        Local local = ioc.getBean(Local.class);
        System.out.println(local);
    }
}

二、@EnableAsync、@Async实现异步线程池

1.定义异步线程池

@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {
   
   
    //定义线程池
    @Override
    public Executor getAsyncExecutor() {
   
   
        ThreadPoolTaskExecutor taskExecutor = new Thr