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近期一个项目需要用到简单的定时任务，需要支持配置文件里修改 执行周期。记录如下 maven依赖

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

关键代码

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@Bean
public SchedulingConfigurer schedulingConfigurer(){
    return new SchedulingConfigurer() {
        @Override public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
            scheduledTaskRegistrar.addCronTask(runnable,schedule);
        }
    };
}

完整代码

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package com.example;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;

@SpringBootApplication
@EnableScheduling
public class DemoApplication {

    @Value("${demo.schedule}")
    String schedule;

    public static void  main(String[] args){
        SpringApplication.run(DemoApplication.class, args);
    }

    @Bean
    public SchedulingConfigurer schedulingConfigurer(){
        return new SchedulingConfigurer() {
            @Override public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
                scheduledTaskRegistrar.addCronTask(runnable,schedule);
            }
        };
    }

    Runnable runnable = new Runnable() {
        int i;
        @Override public void run() {
            System.out.println("runing " + ++i);
        }
    };

}

在application.properties里加一行

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demo.schedule=*/3 * * * * ?

这个表示 每3秒执行一次。

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