前言
在我們?nèi)粘5拈_發(fā)中,很多時(shí)候,定時(shí)任務(wù)都不是寫死的,而是寫到數(shù)據(jù)庫中,從而實(shí)現(xiàn)定時(shí)任務(wù)的動(dòng)態(tài)配置,下面就通過一個(gè)簡單的示例,來實(shí)現(xiàn)這個(gè)功能。
一、新建一個(gè)springboot工程,并添加依賴
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
< dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-data-jpa</ artifactId > </ dependency > < dependency > <!-- 為了方便測試,此處使用了內(nèi)存數(shù)據(jù)庫 --> < groupId >com.h2database</ groupId > < artifactId >h2</ artifactId > < scope >runtime</ scope > </ dependency > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-test</ artifactId > < scope >test</ scope > </ dependency > < dependency > < groupId >org.quartz-scheduler</ groupId > < artifactId >quartz</ artifactId > < version >2.2.1</ version > < exclusions > < exclusion > < artifactId >slf4j-api</ artifactId > < groupId >org.slf4j</ groupId > </ exclusion > </ exclusions > </ dependency > < dependency > <!-- 該依賴必加,里面有sping對(duì)schedule的支持 --> < groupId >org.springframework</ groupId > < artifactId >spring-context-support</ artifactId > </ dependency > |
二、配置文件application.properties
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
# 服務(wù)器端口號(hào) server.port=7902 # 是否生成ddl語句 spring.jpa.generate-ddl=false # 是否打印sql語句 spring.jpa.show-sql=true # 自動(dòng)生成ddl,由于指定了具體的ddl,此處設(shè)置為none spring.jpa.hibernate.ddl-auto=none # 使用H2數(shù)據(jù)庫 spring.datasource.platform=h2 # 指定生成數(shù)據(jù)庫的schema文件位置 spring.datasource.schema=classpath:schema.sql # 指定插入數(shù)據(jù)庫語句的腳本位置 spring.datasource.data=classpath:data.sql # 配置日志打印信息 logging.level.root=INFO logging.level.org.hibernate=INFO logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE logging.level.org.hibernate.type.descriptor.sql.BasicExtractor=TRACE logging.level.com.itmuch=DEBUG |
三、Entity類
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
package com.chhliu.springboot.quartz.entity; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class Config { @Id @GeneratedValue (strategy = GenerationType.AUTO) private Long id; @Column private String cron; /** * @return the id */ public Long getId() { return id; } ……此處省略getter和setter方法…… } |
四、任務(wù)類
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
package com.chhliu.springboot.quartz.entity; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.stereotype.Component; @Configuration @Component // 此注解必加 @EnableScheduling // 此注解必加 public class ScheduleTask { private static final Logger LOGGER = LoggerFactory.getLogger(ScheduleTask. class ); public void sayHello(){ LOGGER.info( "Hello world, i'm the king of the world!!!" ); } } |
五、Quartz配置類
由于springboot追求零xml配置,所以下面會(huì)以配置Bean的方式來實(shí)現(xiàn)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
package com.chhliu.springboot.quartz.entity; import org.quartz.Trigger; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.quartz.CronTriggerFactoryBean; import org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean; import org.springframework.scheduling.quartz.SchedulerFactoryBean; @Configuration public class QuartzConfigration { /** * attention: * Details:配置定時(shí)任務(wù) */ @Bean (name = "jobDetail" ) public MethodInvokingJobDetailFactoryBean detailFactoryBean(ScheduleTask task) { // ScheduleTask為需要執(zhí)行的任務(wù) MethodInvokingJobDetailFactoryBean jobDetail = new MethodInvokingJobDetailFactoryBean(); /* * 是否并發(fā)執(zhí)行 * 例如每5s執(zhí)行一次任務(wù),但是當(dāng)前任務(wù)還沒有執(zhí)行完,就已經(jīng)過了5s了, * 如果此處為true,則下一個(gè)任務(wù)會(huì)執(zhí)行,如果此處為false,則下一個(gè)任務(wù)會(huì)等待上一個(gè)任務(wù)執(zhí)行完后,再開始執(zhí)行 */ jobDetail.setConcurrent(false); jobDetail.setName("srd-chhliu");// 設(shè)置任務(wù)的名字 jobDetail.setGroup("srd");// 設(shè)置任務(wù)的分組,這些屬性都可以存儲(chǔ)在數(shù)據(jù)庫中,在多任務(wù)的時(shí)候使用 /* * 為需要執(zhí)行的實(shí)體類對(duì)應(yīng)的對(duì)象 */ jobDetail.setTargetObject(task); /* * sayHello為需要執(zhí)行的方法 * 通過這幾個(gè)配置,告訴JobDetailFactoryBean我們需要執(zhí)行定時(shí)執(zhí)行ScheduleTask類中的sayHello方法 */ jobDetail.setTargetMethod("sayHello"); return jobDetail; } /** * attention: * Details:配置定時(shí)任務(wù)的觸發(fā)器,也就是什么時(shí)候觸發(fā)執(zhí)行定時(shí)任務(wù) */ @Bean(name = "jobTrigger") public CronTriggerFactoryBean cronJobTrigger(MethodInvokingJobDetailFactoryBean jobDetail) { CronTriggerFactoryBean tigger = new CronTriggerFactoryBean(); tigger.setJobDetail(jobDetail.getObject()); tigger.setCronExpression("0 30 20 * * ?");// 初始時(shí)的cron表達(dá)式 tigger.setName("srd-chhliu");// trigger的name return tigger; } /** * attention: * Details:定義quartz調(diào)度工廠 */ @Bean (name = "scheduler" ) public SchedulerFactoryBean schedulerFactory(Trigger cronJobTrigger) { SchedulerFactoryBean bean = new SchedulerFactoryBean(); // 用于quartz集群,QuartzScheduler 啟動(dòng)時(shí)更新己存在的Job bean.setOverwriteExistingJobs( true ); // 延時(shí)啟動(dòng),應(yīng)用啟動(dòng)1秒后 bean.setStartupDelay( 1 ); // 注冊(cè)觸發(fā)器 bean.setTriggers(cronJobTrigger); return bean; } } |
六、定時(shí)查庫,并更新任務(wù)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
package com.chhliu.springboot.quartz.entity; import javax.annotation.Resource; import org.quartz.CronScheduleBuilder; import org.quartz.CronTrigger; import org.quartz.JobDetail; import org.quartz.Scheduler; import org.quartz.SchedulerException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; import com.chhliu.springboot.quartz.repository.ConfigRepository; @Configuration @EnableScheduling @Component public class ScheduleRefreshDatabase { @Autowired private ConfigRepository repository; @Resource (name = "jobDetail" ) private JobDetail jobDetail; @Resource (name = "jobTrigger" ) private CronTrigger cronTrigger; @Resource (name = "scheduler" ) private Scheduler scheduler; @Scheduled (fixedRate = 5000 ) // 每隔5s查庫,并根據(jù)查詢結(jié)果決定是否重新設(shè)置定時(shí)任務(wù) public void scheduleUpdateCronTrigger() throws SchedulerException { CronTrigger trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey()); String currentCron = trigger.getCronExpression(); // 當(dāng)前Trigger使用的 String searchCron = repository.findOne(1L).getCron(); // 從數(shù)據(jù)庫查詢出來的 System.out.println(currentCron); System.out.println(searchCron); if (currentCron.equals(searchCron)) { // 如果當(dāng)前使用的cron表達(dá)式和從數(shù)據(jù)庫中查詢出來的cron表達(dá)式一致,則不刷新任務(wù) } else { // 表達(dá)式調(diào)度構(gòu)建器 CronScheduleBuilder scheduleBuilder = CronScheduleBuilder.cronSchedule(searchCron); // 按新的cronExpression表達(dá)式重新構(gòu)建trigger trigger = (CronTrigger) scheduler.getTrigger(cronTrigger.getKey()); trigger = trigger.getTriggerBuilder().withIdentity(cronTrigger.getKey()) .withSchedule(scheduleBuilder).build(); // 按新的trigger重新設(shè)置job執(zhí)行 scheduler.rescheduleJob(cronTrigger.getKey(), trigger); currentCron = searchCron; } } } |
六、相關(guān)腳本
1、data.sql
1
|
insert into config(id,cron) values (1, '0 0/2 * * * ?' ); # 每2分鐘執(zhí)行一次定時(shí)任務(wù) |
2、schema.sql
1
2
3
4
5
6
|
drop table config if exists; create table config( id bigint generated by default as identity, cron varchar (40), primary key (id) ); |
六、運(yùn)行測試
測試結(jié)果如下:(Quartz默認(rèn)的線程池大小為10)
1
2
3
4
5
6
|
0 30 20 * * ? 0 0/2 * * * ? 2017-03-08 18:02:00.025 INFO 5328 --- [eduler_Worker-1] c.c.s.quartz.entity.ScheduleTask : Hello world, i'm the king of the world!!! 2017-03-08 18:04:00.003 INFO 5328 --- [eduler_Worker-2] c.c.s.quartz.entity.ScheduleTask : Hello world, i'm the king of the world!!! 2017-03-08 18:06:00.002 INFO 5328 --- [eduler_Worker-3] c.c.s.quartz.entity.ScheduleTask : Hello world, i'm the king of the world!!! 2017-03-08 18:08:00.002 INFO 5328 --- [eduler_Worker-4] c.c.s.quartz.entity.ScheduleTask : Hello world, i'm the king of the world!!! |
從上面的日志打印時(shí)間來看,我們實(shí)現(xiàn)了動(dòng)態(tài)配置,最初的時(shí)候,任務(wù)是每天20:30執(zhí)行,后面通過動(dòng)態(tài)刷新變成了每隔2分鐘執(zhí)行一次。
雖然上面的解決方案沒有使用Quartz推薦的方式完美,但基本上可以滿足我們的需求,當(dāng)然也可以采用觸發(fā)事件的方式來實(shí)現(xiàn),例如當(dāng)前端修改定時(shí)任務(wù)的觸發(fā)時(shí)間時(shí),異步的向后臺(tái)發(fā)送通知,后臺(tái)收到通知后,然后再更新程序,也可以實(shí)現(xiàn)動(dòng)態(tài)的定時(shí)任務(wù)刷新
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持服務(wù)器之家。
原文鏈接:http://blog.csdn.net/liuchuanhong1/article/details/60873295