Spring Boot 启动后执行，其实CommandLineRunner和ApplicationRunner并无太大区别，前者通过数组接收启动参数，后者通过ApplicationArguments对象封装了启动参数。

CommandLineRunner

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class CustomRunner implements CommandLineRunner {
    @Override
    public void run(String... args) {
        System.out.println(args);
    }
}

ApplicationRunner

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;
@Component
public class CustomRunner implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments args) {
        args.getOptionNames().forEach(e -> System.out.printf("key: %s, value: %s%n", e, args.getOptionValues(e).toString()));
    }
}