Spring when the project started, ApplicationRunner and CommandLineRunner usage

Spring when the project started, if you need to initialize resources, can achieve ApplicationRunner or CommandLineRunner, and can use annotation @Order specify their running order.

Sample Code: https://github.com/rickding/HelloJava/tree/master/HelloRunner

3 types of documents:

RunnerApplication.java achieve SpringBootApplication main program:

HelloApplicationRunner.java achieve ApplicationRunner:

HelloCommandLineRunner.java achieve CommandLineRunner, and specifies @Order (1):

Output log:

Reference article: https://blog.csdn.net/qq_28804275/article/details/80891941