目录

• 前言
• 具体应用
  • 实现CommandLineRunner接口
  • CommandLineRunner实现类的执行顺序

前言

CommandLineRunner接口在容器启动成功后最后一步调用，常用于应用程序启动后初始化操作，其在整个应用生命周期内只会执行一次。

具体应用

实现CommandLineRunner接口

• Runner.java

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class Runner implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        /**
         * TODO:
         */
        System.out.println(" Runner run ");
    }
}

• CommandLineRunner会在Spring Boot容器加载之后执行

CommandLineRunner实现类的执行顺序

• 使用@Order注解定义CommandLineRunner的执行顺序

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(1)
public class RunnerOne implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        /**
         * TODO:
         */
        System.out.println(" RunnerOne run ");
    }
}

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(2)
public class RunnerTwo implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        /**
         * TODO:
         */
        System.out.println(" RunnerTwo run ");
    }
}

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