​ SpringBoot对于系统启动时执行的任务，例如配置文件加载，数据库初始化等操作提供了两种解决方案：CommandLineRunner和ApplicationRunner，两者差别主要在于参数。
​ SpringBoot项目启动时会遍历所有的CommandLineRunner和ApplicationRunner的实现类并调用其中的run方法@Order注解可对于这些实现类调用顺序进行排序

1. CommandLineRunner的实现类Demo

   /**
    * @author wsyjlly
    * @create 2019.06.14 - 19:36
    * 配置启动系统参数
    **/
   @Component
   @Order(1)
   public class MyCommandLineRunner1 implements CommandLineRunner {
       @Override
       public void run(String... args) throws Exception {
           System.out.println("MyCommandLineRunner1:"+Arrays.toString(args));
           System.out.println("——————————————————————");
       }
   }
   

   /**
    * @author wsyjlly
    * @create 2019.06.14 - 19:36
    * 配置启动系统参数
    **/
   @Component
   @Order(2)
   public class MyCommandLineRunner2 implements CommandLineRunner {
       @Override
       public void run(String... args) throws Exception {
           System.out.println("MyCommandLineRunner2:"+Arrays.toString(args));
           System.out.println("——————————————————————");
       }
   }
   
   

2. ApplicationRunner的实现类Demo

   /**
    * @author wsyjlly
    * @create 2019.06.14 - 19:39
    * 配置启动系统参数
    **/
   @Component
   @Order(1)
   public class MyApplicationRunner1 implements ApplicationRunner {
   
       @Override
       public void run(ApplicationArguments args) throws Exception {
           List<String> nonOptionArgs = args.getNonOptionArgs();
           System.out.println("1-nonOptionArgs:"+nonOptionArgs);
           Set<String> optionNames = args.getOptionNames();
           for (String item:optionNames){
               System.out.println("1-Key:"+item+";value:"+args.getOptionValues(item));
           }
       }
   }
   

   /**
    * @author wsyjlly
    * @create 2019.06.14 - 19:39
    * 配置启动系统参数
    **/
   @Component
   @Order(2)
   public class MyApplicationRunner2 implements ApplicationRunner {
       @Override
       public void run(ApplicationArguments args) throws Exception {
           List<String> nonOptionArgs = args.getNonOptionArgs();
           System.out.println("2-nonOptionArgs:"+nonOptionArgs);
           Set<String> optionNames = args.getOptionNames();
           for (String item:optionNames){
               System.out.println("2-Key:"+item+";value:"+args.getOptionValues(item));
           }
       }
   }
   

3. 测试

   测试参数 打印结果