spring boot 2 定时任务

图片发自App

任务执行

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;

/**
 * 定时任务
 * @author congco
 * @date 19-6-4 下午3:01
 */
@EnableAsync
@EnableScheduling 
@Component
public class CrudeTaskSchedule {

    /**
     * 5S执行一次
     */
    @Async
    @Scheduled(fixedDelay = 5000)
    public void crudeTask(){
        System.out.println(LocalDateTime.now());
        System.out.println(Thread.currentThread().getName());
    }
}

说明
@EnableScheduling 开启定时任务
@EnableAsync 开启异步
@Scheduled(fixedDelay = 5000） 执行时间配置

/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.scheduling.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * An annotation that marks a method to be scheduled. Exactly one of
 * the {@link #cron()}, {@link #fixedDelay()}, or {@link #fixedRate()}
 * attributes must be specified.
 *
 * 
The annotated method must expect no arguments. It will typically have
 * a {@code void} return type; if not, the returned value will be ignored
 * when called through the scheduler.
 *
 * 
Processing of {@code @Scheduled} annotations is performed by
 * registering a {@link ScheduledAnnotationBeanPostProcessor}. This can be
 * done manually or, more conveniently, through the {@code }
 * element or @{@link EnableScheduling} annotation.
 *
 * 
This annotation may be used as a meta-annotation to create custom
 * composed annotations with attribute overrides.
 *
 * @author Mark Fisher
 * @author Juergen Hoeller
 * @author Dave Syer
 * @author Chris Beams
 * @since 3.0
 * @see EnableScheduling
 * @see ScheduledAnnotationBeanPostProcessor
 * @see Schedules
 */
@Target({ElementType.METHOD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Repeatable(Schedules.class)
public @interface Scheduled {

    /**
     * A special cron expression value that indicates a disabled trigger: {@value}.
     * 
This is primarily meant for use with ${...} placeholders, allowing for
     * external disabling of corresponding scheduled methods.
     * @since 5.1
     */
    String CRON_DISABLED = "-";


    /**
     * A cron-like expression, extending the usual UN*X definition to include triggers
     * on the second as well as minute, hour, day of month, month and day of week.
     * 
E.g. {@code "0 * * * * MON-FRI"} means once per minute on weekdays
     * (at the top of the minute - the 0th second).
     * 
The special value {@link #CRON_DISABLED "-"} indicates a disabled cron trigger,
     * primarily meant for externally specified values resolved by a ${...} placeholder.
     * @return an expression that can be parsed to a cron schedule
     * @see org.springframework.scheduling.support.CronSequenceGenerator
     */
    String cron() default "";

    /**
     * A time zone for which the cron expression will be resolved. By default, this
     * attribute is the empty String (i.e. the server's local time zone will be used).
     * @return a zone id accepted by {@link java.util.TimeZone#getTimeZone(String)},
     * or an empty String to indicate the server's default time zone
     * @since 4.0
     * @see org.springframework.scheduling.support.CronTrigger#CronTrigger(String, java.util.TimeZone)
     * @see java.util.TimeZone
     */
    String zone() default "";

    /**
     * Execute the annotated method with a fixed period in milliseconds between the
     * end of the last invocation and the start of the next.
     * @return the delay in milliseconds
     */
    long fixedDelay() default -1;

    /**
     * Execute the annotated method with a fixed period in milliseconds between the
     * end of the last invocation and the start of the next.
     * @return the delay in milliseconds as a String value, e.g. a placeholder
     * or a {@link java.time.Duration#parse java.time.Duration} compliant value
     * @since 3.2.2
     */
    String fixedDelayString() default "";

    /**
     * Execute the annotated method with a fixed period in milliseconds between
     * invocations.
     * @return the period in milliseconds
     */
    long fixedRate() default -1;

    /**
     * Execute the annotated method with a fixed period in milliseconds between
     * invocations.
     * @return the period in milliseconds as a String value, e.g. a placeholder
     * or a {@link java.time.Duration#parse java.time.Duration} compliant value
     * @since 3.2.2
     */
    String fixedRateString() default "";

    /**
     * Number of milliseconds to delay before the first execution of a
     * {@link #fixedRate()} or {@link #fixedDelay()} task.
     * @return the initial delay in milliseconds
     * @since 3.2
     */
    long initialDelay() default -1;

    /**
     * Number of milliseconds to delay before the first execution of a
     * {@link #fixedRate()} or {@link #fixedDelay()} task.
     * @return the initial delay in milliseconds as a String value, e.g. a placeholder
     * or a {@link java.time.Duration#parse java.time.Duration} compliant value
     * @since 3.2.2
     */
    String initialDelayString() default "";

}

在线cron生成器

image.png

• 如果需要自定义线程池的大小，在配置文件中添加配置

image.png