Application Runner和Command Line Runner接口允许您在Spring Boot应用程序启动后执行代码.您可以使用这些界面在应用程序启动后立即执行任何操作.本章将详细讨论它们.
Application Runner
Application Runner是一个用于在Spring Boot应用程序启动后执行代码的接口.下面给出的示例显示了如何在主类文件上实现Application Runner接口.
package com.it1352.demo; import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoApplication implements ApplicationRunner { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } @Override public void run(ApplicationArguments arg0) throws Exception { System.out.println("Hello World from Application Runner"); }}现在，如果你观察控制台窗口应用程序运行者的Hello World ，在Tomcat启动后执行println语句.以下屏幕截图是否相关？
命令Line Runner
Command Line Runner是一个界面.它用于在Spring Boot应用程序启动后执行代码.下面给出的示例显示了如何在主类文件上实现Command Line Runner接口.
package com.it1352.demo; import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class DemoApplication implements CommandLineRunner { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } @Override public void run(String... arg0) throws Exception { System.out.println("Hello world from Command Line Runner"); }}查看"命令行运行器的Hello world"下面的控制台窗口，在Tomcat启动后执行println语句.
