Spring boot中如何使用CommandLineRunner接口实现初始化呢?

    CommandLineRunner可实现
      应用程序初始化后
       运行一段代码逻辑
      整个生命周期只会运行一次
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下文笔者讲述三种方式使用CommandLineRunner
    

同@Component注解一起使用

@Component
public class ApplicationStartupRunner implements CommandLineRunner {
    protected final Log logger = LogFactory.getLog(getClass());
 
    @Override
    public void run(String... args) throws Exception {
        logger.info("ApplicationStartupRunner run method Started !!");
    }
}

同@SpringBootApplication注解一起使用

@SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer implements CommandLineRunner {
 
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringBootWebApplication.class);
    }
 
    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootWebApplication.class, args);
    }
 
 
    @Override
    public void run(String... args) throws Exception {
        logger.info("Application Started !!");
    }
}

实现CommandLineRunner接口的Bean

public class ApplicationStartupRunner implements CommandLineRunner {
    protected final Log logger = LogFactory.getLog(getClass());
    @Override
    public void run(String... args) throws Exception {
        logger.info("Application Started !!");
    }
}

注册ApplicationStartupRunner bean

@SpringBootApplication
public class SpringBootWebApplication extends SpringBootServletInitializer {
 
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringBootWebApplication.class);
    }
 
    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootWebApplication.class, args);
    }
 
    @Bean
    public ApplicationStartupRunner schedulerRunner() {
        return new ApplicationStartupRunner();
    }
}

设置多个CommanderLineRunner的运行顺序

@Order(value=3)
@Component
class ApplicationStartupRunnerOne implements CommandLineRunner {
    protected final Log logger = LogFactory.getLog(getClass());
 
    @Override
    public void run(String... args) throws Exception {
        logger.info("ApplicationStartupRunnerOne run method Started !!");
    }
}
 
@Order(value=2)
@Component
class ApplicationStartupRunnerTwo implements CommandLineRunner {
    protected final Log logger = LogFactory.getLog(getClass());
 
    @Override
    public void run(String... args) throws Exception {
        logger.info("ApplicationStartupRunnerTwo run method Started !!");
    }
}