Spring Boot 5：应用程序启动时初始化资源

Posted 2021-01-15 一叶一世界abandon

 

需求：应用程序启动后，初始化基础数据、加密证书等操作。

可以使用CommandLineRunner接口来实现，在SpringBoot.run()之后完成资源的初始化工作。

注意：多个Runner需要顺序启动的话，可以使用@Order注解

package sun.flower.diver.modules.system.init;

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

/**
 * 应用程序启动后加载基础数据 Runner
 *
 * @Author YangXuyue
 * @Date 2018/10/28 13:48
 */
@Component
@Order(1)
public class BaseDataRunner implements CommandLineRunner {
    @Override
    public void run(String... strings) throws Exception {
        System.out.println("start init base data");
    }
}

package sun.flower.diver.modules.system.init;

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

/**
 * 应用程序启动后加载证书 Runner
 *
 * @Author YangXuyue
 * @Date 2018/10/28 13:50
 */
@Component
@Order(2)
public class CertificateRunner implements CommandLineRunner {
    @Override
    public void run(String... strings) throws Exception {
        System.out.println("start init certificate info");
    }
}

package sun.flower.diver;

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
// 添加注解 @EnableDiscoveryClient，只有这样，服务注册、心跳检测相关配置信息才能被自动加载
@EnableDiscoveryClient
public class DiverApplication {

    public static void main(String[] args) {
        System.out.println("application start");

        SpringApplication application = new SpringApplication(DiverApplication.class);
        // 添加监听器，此时监听器类不需要标注是一个Bean
        //application.addListeners(new BaseListener());
        application.setBannerMode(Banner.Mode.OFF);
        application.run(args);

        System.out.println("application started");
    }

}