Runner启动器

Runner启动器的两种创建方式：

• 实现ApplicationRunner接口，复写run()方法
• 实现CommandLineRunner接口，复写run()方法

Runner启动器的执行顺序

　　如果一个项目中包含多个启动器，可以让启动器类实现 org.springframework.core.Ordered接口或者使用 org.springframework.core.annotation.Order注解类来注解启动器类。项目启动时会按照指定的order升序执行。

Runner启动器的创建示例

示例一：实现ApplicationRunner接口

package com.huang.pims.demo.runners;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

@Component
@Order(value = 1)
public class ApplicationRunnerDemo implements ApplicationRunner, Ordered {

    private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationRunnerDemo.class);

    @Override
    public void run(ApplicationArguments args) throws Exception {
        LOGGER.info("order:{} ApplicationRunnerDemo.run()...", getOrder());
    }

    @Override
    public int getOrder() {
        return 1;
    }
}

示例二：实现CommandLineRunner接口

package com.huang.pims.demo.runners;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;

@Component
public class CommandLineRunnerDemo implements CommandLineRunner, Ordered {

    private static final Logger LOGGER = LoggerFactory.getLogger(CommandLineRunnerDemo.class);

    @Override
    public void run(String... args) throws Exception {
        LOGGER.info("order:{} CommandLineRunner.run()...", getOrder());
    }

    @Override
    public int getOrder() {
        return 0;
    }
}

　　以上两种创建方式，都需要使用@Component注解将之添加到Spring IOC容器中，这样，项目在启动时就会自动执行Runner启动器中的run()方法。

启动项目后的效果如下：