springboot启动后执行某些动作

1.主要是springboot的启动run方法里调用了callRunners，会去调用实现了ApplicationRunner接口的类的方法

public ConfigurableApplicationContext run(String... args) {
StopWatch stopWatch = new StopWatch();
stopWatch.start();
DefaultBootstrapContext bootstrapContext = createBootstrapContext();
ConfigurableApplicationContext context = null;
configureHeadlessProperty();
SpringApplicationRunListeners listeners = getRunListeners(args);
listeners.starting(bootstrapContext, this.mainApplicationClass);
try {
ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
ConfigurableEnvironment environment = prepareEnvironment(listeners, bootstrapContext, applicationArguments);
configureIgnoreBeanInfo(environment);
Banner printedBanner = printBanner(environment);
context = createApplicationContext();
context.setApplicationStartup(this.applicationStartup);
prepareContext(bootstrapContext, context, environment, listeners, applicationArguments, printedBanner);
refreshContext(context);
afterRefresh(context, applicationArguments);
stopWatch.stop();
if (this.logStartupInfo) {
new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
      }
listeners.started(context);
callRunners(context, applicationArguments);
    }
catch (Throwable ex) {
handleRunFailure(context, ex, listeners);
throw new IllegalStateException(ex);
    }

try {
listeners.running(context);
    }
catch (Throwable ex) {
handleRunFailure(context, ex, null);
throw new IllegalStateException(ex);
    }
return context;
  }


2.编写相关调用

此处applicationContext加载完成后进行了输出DeltaConfigApplication start finished !!!!!!!

@Component
public class DeltaConfigApplicationRunner implements ApplicationRunner {

private static final Logger logger = LoggerFactory.getLogger(DeltaConfigApplicationRunner.class);

public void run(ApplicationArguments args) throws Exception {
logger.info("DeltaConfigApplication start finished !!!!!!!");
    }
}