import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class MyStartupRunner implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("項目已經(jīng)啟動");
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
/**
 * 優(yōu)先級最高
 * 該類期望在springboot 啟動后第一順位執(zhí)行
 * @since 12:57
 **/
@Slf4j
@Component
public class HighOrderCommandLineRunner implements CommandLineRunner, Ordered {
    @Override
    public void run(String... args) throws Exception {
        for (String arg : args) {
            log.info("arg = " + arg);
        }
        log.info("i am highOrderRunner");
    }
    @Override
    public int getOrder() {
        return Integer.MIN_VALUE+1;
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
/**
 * 優(yōu)先級低于{@code HighOrderCommandLineRunner}
 * @since 12:59
 **/
@Slf4j
@Component
public class LowOrderCommandLineRunner implements CommandLineRunner, Ordered {
    @Override
    public void run(String... args) throws Exception {
        log.info("i am lowOrderRunner");
    }
    @Override
    public int getOrder() {
        return Integer.MIN_VALUE+1;
    }
}

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Order(value=2)
public class MyStartupRunner1 implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("執(zhí)行2");
    }
}

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Order(value=1)
public class MyStartupRunner2 implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("執(zhí)行1");
    }
}

import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
/**
 * 優(yōu)先級最低
 **/
@Slf4j
@Component
public class DefaultApplicationRunner implements ApplicationRunner, Ordered {
    @Override
    public void run(ApplicationArguments args) throws Exception {
        log.info("i am applicationRunner");
        Set<String> optionNames = args.getOptionNames();
        log.info("optionNames = " + optionNames);
        String[] sourceArgs = args.getSourceArgs();
        log.info("sourceArgs = " + Arrays.toString(sourceArgs));
        List<String> nonOptionArgs = args.getNonOptionArgs();
        log.info("nonOptionArgs = " + nonOptionArgs);
        List<String> optionValues = args.getOptionValues("foo");
        log.info("optionValues = " + optionValues);
    }
    @Override
    public int getOrder() {
        return Integer.MIN_VALUE+2;
    }
}

 optionValues = null

java -jar yourapp.jar --foo=bar --foo=baz --dev.name=fcant java fcantcn

public ConfigurableApplicationContext run(String... args) {
   StopWatch stopWatch = new StopWatch();
   //設置線程啟動計時器
   stopWatch.start();
   ConfigurableApplicationContext context = null;
   Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
   //配置系統(tǒng)屬性：默認缺失外部顯示屏等允許啟動
   configureHeadlessProperty();
   //獲取并啟動事件監(jiān)聽器，如果項目中沒有其他監(jiān)聽器，則默認只有EventPublishingRunListener
   SpringApplicationRunListeners listeners = getRunListeners(args);
   //將事件廣播給listeners
   listeners.starting();
   try {
       //對于實現(xiàn)ApplicationRunner接口，用戶設置ApplicationArguments參數(shù)進行封裝
      ApplicationArguments applicationArguments = new DefaultApplicationArguments(
            args);
      //配置運行環(huán)境：例如激活應用***.yml配置文件      
      ConfigurableEnvironment environment = prepareEnvironment(listeners,
            applicationArguments);
      configureIgnoreBeanInfo(environment);
      //加載配置的banner(gif,txt...)，即控制臺圖樣
      Banner printedBanner = printBanner(environment);
      //創(chuàng)建上下文對象，并實例化
      context = createApplicationContext();
      exceptionReporters = getSpringFactoriesInstances(
            SpringBootExceptionReporter.class,
            new Class[] { ConfigurableApplicationContext.class }, context);
      //配置SPring容器      
      prepareContext(context, environment, listeners, applicationArguments,
            printedBanner);
      //刷新Spring上下文，創(chuàng)建bean過程中      
      refreshContext(context);
      //空方法，子類實現(xiàn)
      afterRefresh(context, applicationArguments);
      //停止計時器：計算線程啟動共用時間
      stopWatch.stop();
      if (this.logStartupInfo) {
         new StartupInfoLogger(this.mainApplicationClass)
               .logStarted(getApplicationLog(), stopWatch);
      }
      //停止事件監(jiān)聽器
      listeners.started(context);
      //開始加載資源
      callRunners(context, applicationArguments);
   }
   catch (Throwable ex) {
      handleRunFailure(context, listeners, exceptionReporters, ex);
      throw new IllegalStateException(ex);
   }
   listeners.running(context);
   return context;
}

private void callRunners(ApplicationContext context, ApplicationArguments args) {
    //將實現(xiàn)ApplicationRunner和CommandLineRunner接口的類，存儲到集合中
   List<Object> runners = new ArrayList<>();
   runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
   runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
   //按照加載先后順序排序
   AnnotationAwareOrderComparator.sort(runners);
   for (Object runner : new LinkedHashSet<>(runners)) {
      if (runner instanceof ApplicationRunner) {
         callRunner((ApplicationRunner) runner, args);
      }
      if (runner instanceof CommandLineRunner) {
         callRunner((CommandLineRunner) runner, args);
      }
   }
}

private void callRunner(CommandLineRunner runner, ApplicationArguments args) {
   try {
       //調(diào)用各個實現(xiàn)類中的邏輯實現(xiàn)
      (runner).run(args.getSourceArgs());
   }
   catch (Exception ex) {
      throw new IllegalStateException("Failed to execute CommandLineRunner", ex);
   }
}