玩转springboot之xxxRunner接口使用

Runner使用

如果需要在SpringApplication启动后执行一些逻辑，可以使用ApplicationRunner或CommandLineRunner接口，这两个接口都是只有一个run方法

public interface ApplicationRunner {void run(ApplicationArguments args) throws Exception;}

public interface CommandLineRunner {void run(String... args) throws Exception;}

实现

@Component
public class CodeReview implements ApplicationRunner {@Overridepublic void run(ApplicationArguments args) throws Exception {// 业务逻辑}

执行位置

该实现类是在SpringApplication.run方法最后进行执行的

afterRefresh(context, applicationArguments);protected void afterRefresh(ConfigurableApplicationContext context,ApplicationArguments args) {callRunners(context, args);}private void callRunners(ApplicationContext context, ApplicationArguments args) {List<Object> runners = new ArrayList<Object>();runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());AnnotationAwareOrderComparator.sort(runners);for (Object runner : new LinkedHashSet<Object>(runners)) {if (runner instanceof ApplicationRunner) {callRunner((ApplicationRunner) runner, args);}if (runner instanceof CommandLineRunner) {callRunner((CommandLineRunner) runner, args);}}}