Spring boot如何通過@Scheduled實現(xiàn)定時任務(wù)及多線程配置
這篇文章主要介紹了Spring boot如何通過@Scheduled實現(xiàn)定時任務(wù)及多線程配置,文中通過示例代碼介紹的非常詳細(xì),對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值,需要的朋友可以參考下
使用@Scheduled 可以很容易實現(xiàn)定時任務(wù)
spring boot的版本 2.1.6.RELEASE
package com.abc.demo.common;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.concurrent.TimeUnit;
@EnableScheduling
@Component
public class ScheduleSetting {
private final Logger logger = LoggerFactory.getLogger(Tasks.class);
@Scheduled(fixedRate = 10000, initialDelay = 2000)
public void scheduleRead() {
try {
long timeStamp = System.currentTimeMillis();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Thread thread = Thread.currentThread();
System.out.println("cron1任務(wù)開始,start=" + simpleDateFormat.format(timeStamp) + ", threadId=" + thread.getId() + ", threadName=" + thread.getName());
long endStamp = System.currentTimeMillis();
try {
TimeUnit.SECONDS.sleep(20);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("cron1任務(wù)正在運行的線程名稱:" + thread.getName() + " 結(jié)束,start=" + simpleDateFormat.format(timeStamp) + ",end=" + simpleDateFormat.format(endStamp));
System.out.println("++++++++++++++++++++++++");
} catch (Exception e) {
logger.error(e.getMessage());
}
}
@Scheduled(fixedRate = 5000, initialDelay = 1000)
public void scheduleConvert() {
try {
long timeStamp = System.currentTimeMillis();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Thread thread = Thread.currentThread();
System.out.println("cron2任務(wù)開始,start=" + simpleDateFormat.format(timeStamp) + ", threadId=" + thread.getId() + ", threadName=" + thread.getName());
try {
TimeUnit.SECONDS.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
long endStamp = System.currentTimeMillis();
System.out.println("cron2任務(wù)正在運行的線程名稱:" + thread.getName() + " 結(jié)束,start=" + simpleDateFormat.format(timeStamp) + ",end=" + simpleDateFormat.format(endStamp));
System.out.println("====================");
} catch (Exception e) {
logger.error(e.getMessage());
}
}
}
運行輸出內(nèi)容為
cron2任務(wù)開始,start=2019-10-11 17:31:52, threadId=34, threadName=scheduling-1 cron2任務(wù)正在運行的線程名稱:scheduling-1 結(jié)束,start=2019-10-11 17:31:52,end=2019-10-11 17:32:02 ==================== cron1任務(wù)開始,start=2019-10-11 17:32:02, threadId=34, threadName=scheduling-1 cron1任務(wù)正在運行的線程名稱:scheduling-1 結(jié)束,start=2019-10-11 17:32:02,end=2019-10-11 17:32:02 ++++++++++++++++++++++++ cron2任務(wù)開始,start=2019-10-11 17:32:22, threadId=34, threadName=scheduling-1 cron2任務(wù)正在運行的線程名稱:scheduling-1 結(jié)束,start=2019-10-11 17:32:22,end=2019-10-11 17:32:32 ……
注:
cron2執(zhí)行完后才會執(zhí)行cron1
原因:
spring默認(rèn)是以單線程執(zhí)行任務(wù)調(diào)度
spring的定時任務(wù)默認(rèn)最大運行線程數(shù)為1,多個任務(wù)執(zhí)行起來時間會有問題
1.配置線程池
在配置文件application.properties中添加
# 線程池大小 spring.task.scheduling.pool.size=5 # 線程名前綴 spring.task.scheduling.thread-name-prefix=myScheduling-
輸出內(nèi)容變?yōu)?/p>
cron2任務(wù)開始,start=2019-10-11 17:34:48, threadId=34, threadName=myScheduling-1 cron1任務(wù)開始,start=2019-10-11 17:34:49, threadId=35, threadName=myScheduling-2 cron2任務(wù)正在運行的線程名稱:myScheduling-1 結(jié)束,start=2019-10-11 17:34:48,end=2019-10-11 17:34:58 ==================== cron2任務(wù)開始,start=2019-10-11 17:34:58, threadId=34, threadName=myScheduling-1 cron2任務(wù)正在運行的線程名稱:myScheduling-1 結(jié)束,start=2019-10-11 17:34:58,end=2019-10-11 17:35:08 ==================== cron2任務(wù)開始,start=2019-10-11 17:35:08, threadId=57, threadName=myScheduling-3 cron1任務(wù)正在運行的線程名稱:myScheduling-2 結(jié)束,start=2019-10-11 17:34:49,end=2019-10-11 17:34:49 ……
注:
多線程下,cron1和cron2不用互相等待了,但是同一個任務(wù)還是需要等待的
2.并發(fā)
修改代碼
package com.abc.demo.common;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.text.SimpleDateFormat;
import java.util.concurrent.TimeUnit;
@EnableScheduling
@Component
@EnableAsync
public class ScheduleSetting {
private final Logger logger = LoggerFactory.getLogger(Tasks.class);
@Async
@Scheduled(fixedRate = 10000, initialDelay = 2000)
public void scheduleRead() {
try {
long timeStamp = System.currentTimeMillis();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Thread thread = Thread.currentThread();
System.out.println("cron1任務(wù)開始,start=" + simpleDateFormat.format(timeStamp) + ", threadId=" + thread.getId() + ", threadName=" + thread.getName());
long endStamp = System.currentTimeMillis();
try {
TimeUnit.SECONDS.sleep(20);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("cron1任務(wù)正在運行的線程名稱:" + thread.getName() + " 結(jié)束,start=" + simpleDateFormat.format(timeStamp) + ",end=" + simpleDateFormat.format(endStamp));
System.out.println("++++++++++++++++++++++++");
} catch (Exception e) {
logger.error(e.getMessage());
}
}
@Async
@Scheduled(fixedRate = 5000, initialDelay = 1000)
public void scheduleConvert() {
try {
long timeStamp = System.currentTimeMillis();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Thread thread = Thread.currentThread();
System.out.println("cron2任務(wù)開始,start=" + simpleDateFormat.format(timeStamp) + ", threadId=" + thread.getId() + ", threadName=" + thread.getName());
try {
TimeUnit.SECONDS.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
long endStamp = System.currentTimeMillis();
System.out.println("cron2任務(wù)正在運行的線程名稱:" + thread.getName() + " 結(jié)束,start=" + simpleDateFormat.format(timeStamp) + ",end=" + simpleDateFormat.format(endStamp));
System.out.println("====================");
} catch (Exception e) {
logger.error(e.getMessage());
}
}
}
輸出的內(nèi)容
cron2任務(wù)開始,start=2019-10-11 17:39:53, threadId=57, threadName=task-1 cron1任務(wù)開始,start=2019-10-11 17:39:54, threadId=59, threadName=task-2 cron2任務(wù)開始,start=2019-10-11 17:39:58, threadId=61, threadName=task-3 cron2任務(wù)開始,start=2019-10-11 17:40:03, threadId=63, threadName=task-4 cron2任務(wù)正在運行的線程名稱:task-1 結(jié)束,start=2019-10-11 17:39:53,end=2019-10-11 17:40:03 ==================== cron1任務(wù)開始,start=2019-10-11 17:40:04, threadId=64, threadName=task-5 cron2任務(wù)開始,start=2019-10-11 17:40:08, threadId=65, threadName=task-6 cron2任務(wù)正在運行的線程名稱:task-3 結(jié)束,start=2019-10-11 17:39:58,end=2019-10-11 17:40:08 ==================== cron2任務(wù)開始,start=2019-10-11 17:40:13, threadId=66, threadName=task-7 cron2任務(wù)正在運行的線程名稱:task-4 結(jié)束,start=2019-10-11 17:40:03,end=2019-10-11 17:40:13 ==================== cron1任務(wù)正在運行的線程名稱:task-2 結(jié)束,start=2019-10-11 17:39:54,end=2019-10-11 17:39:54
說明:
- @EnableAsync開啟多線程
- @Async標(biāo)記其為一個異步任務(wù)
- 每個定時任務(wù)都是在通過不同的線程來處理,線程名的前綴成了task-
- 線程默認(rèn)為10個
修改配置
spring.task.execution.thread-name-prefix=mytask- spring.task.execution.pool.core-size=5
重新運行的輸出
cron2任務(wù)開始,start=2019-10-11 17:44:00, threadId=56, threadName=mytask-1 cron1任務(wù)開始,start=2019-10-11 17:44:01, threadId=57, threadName=mytask-2 cron2任務(wù)開始,start=2019-10-11 17:44:05, threadId=58, threadName=mytask-3 cron2任務(wù)開始,start=2019-10-11 17:44:10, threadId=59, threadName=mytask-4 cron2任務(wù)正在運行的線程名稱:mytask-1 結(jié)束,start=2019-10-11 17:44:00,end=2019-10-11 17:44:10 ==================== cron1任務(wù)開始,start=2019-10-11 17:44:11, threadId=60, threadName=mytask-5 cron2任務(wù)正在運行的線程名稱:mytask-3 結(jié)束,start=2019-10-11 17:44:05,end=2019-10-11 17:44:15 ==================== cron2任務(wù)開始,start=2019-10-11 17:44:15, threadId=58, threadName=mytask-3 cron2任務(wù)開始,start=2019-10-11 17:44:20, threadId=56, threadName=mytask-1 cron2任務(wù)正在運行的線程名稱:mytask-4 結(jié)束,start=2019-10-11 17:44:10,end=2019-10-11 17:44:20 ==================== cron1任務(wù)正在運行的線程名稱:mytask-2 結(jié)束,start=2019-10-11 17:44:01,end=2019-10-11 17:44:01
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
- springboot定時任務(wù)@Scheduled執(zhí)行多次的問題
- SpringBoot執(zhí)行定時任務(wù)@Scheduled的方法
- spring-boot通過@Scheduled配置定時任務(wù)及定時任務(wù)@Scheduled注解的方法
- 詳解Spring Boot中使用@Scheduled創(chuàng)建定時任務(wù)
- Spring Boot利用@Async異步調(diào)用:ThreadPoolTaskScheduler線程池的優(yōu)雅關(guān)閉詳解
- spring?boot?使用?@Scheduled?注解和?TaskScheduler?接口實現(xiàn)定時任務(wù)
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