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如何在SpringBoot中使用ElaticJob定时器?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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POM文件配置
4.0.0 com.example demojob 0.0.1-SNAPSHOT jar demojob Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 2.0.2.RELEASE UTF-8 UTF-8 1.8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test elastic-job-common-core com.dangdang 2.1.5 elastic-job-lite-core com.dangdang 2.1.5 elastic-job-lite-spring com.dangdang 2.1.5 elastic-job-cloud-executor com.dangdang 2.1.5 org.mariadb.jdbc mariadb-java-client 1.5.4 com.alibaba druid-spring-boot-starter 1.1.9 com.baomidou mybatisplus-spring-boot-starter 1.0.5 com.baomidou mybatis-plus 2.1.9 org.springframework.boot spring-boot-maven-plugin
yaml文件配置(也可以用application.properties一样的)
# 配置配置数据源 spring: datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: org.mariadb.jdbc.Driver name: elastic-job-event url: jdbc:mariadb://127.0.0.1:3306/elasticjob username: root password: 123456 druid: validationQuery: SELECT 1 initialSize: 10 minIdle: 10 maxActive: 200 minEvictableIdleTimeMillis: 180000 testOnBorrow: false testWhileIdle: true removeAbandoned: true removeAbandonedTimeout: 1800 logAbandoned: true poolPreparedStatements: true maxOpenPreparedStatements: 100 # 配置Zookeeper regCenter: serverList: localhost:2181 namespace: hulk_order_task # 配置定时器规则 simpleJob: cron: 0/5 * * * * ? shardingTotalCount: 1 shardingItemParameters: 0=1
开始写代码
RegistryCenterConfig
package com.example.demojob.config; import com.dangdang.ddframe.job.reg.zookeeper.ZookeeperConfiguration; import com.dangdang.ddframe.job.reg.zookeeper.ZookeeperRegistryCenter; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * 注册中心配置 * 用于注册和协调作业分布式行为的组件,目前仅支持Zookeeper。 * @author shudalei */ @Configuration @ConditionalOnExpression("'${regCenter.serverList}'.length() > 0") public class RegistryCenterConfig { @Bean(initMethod = "init") public ZookeeperRegistryCenter regCenter(@Value("${regCenter.serverList}") final String serverList, @Value("${regCenter.namespace}") final String namespace) { return new ZookeeperRegistryCenter(new ZookeeperConfiguration(serverList, namespace)); } }
JobEventConfig
package com.example.demojob.config; import com.dangdang.ddframe.job.event.JobEventConfiguration; import com.dangdang.ddframe.job.event.rdb.JobEventRdbConfiguration; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import javax.annotation.Resource; import javax.sql.DataSource; /** * 如果想把作业运行的内容写到DB中,我们需要用到另一个构造器, * 同时定义自己的JobEventConfiguration, * 目前来说实现这个接口的只有一个类JobEventRdbConfiguration, * 通过这个可以将作业运行的痕迹进行持久化到DB的操作。 * @author shudalei */ @Configuration public class JobEventConfig { @Resource private DataSource dataSource; @Bean public JobEventConfiguration jobEventConfiguration() { return new JobEventRdbConfiguration(dataSource); } }
SimpleJobConfig
package com.example.demojob.config; import com.dangdang.ddframe.job.config.JobCoreConfiguration; import com.dangdang.ddframe.job.config.simple.SimpleJobConfiguration; import com.dangdang.ddframe.job.event.JobEventConfiguration; import com.dangdang.ddframe.job.lite.api.JobScheduler; import com.dangdang.ddframe.job.lite.config.LiteJobConfiguration; import com.dangdang.ddframe.job.lite.spring.api.SpringJobScheduler; import com.dangdang.ddframe.job.reg.zookeeper.ZookeeperRegistryCenter; import com.example.demojob.job.TestSimpleJob; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import javax.annotation.Resource; @Configuration public class SimpleJobConfig { /** * 注册中心 */ @Resource private ZookeeperRegistryCenter regCenter; /** * job事件配置 */ @Resource private JobEventConfiguration jobEventConfiguration; /** * 微信access token获取任务对象 * */ @Resource private TestSimpleJob simpleJob; /** * * @param cron 定时任务cron配置 * @param shardingTotalCount 任务分片数 * @param shardingItemParameters 任务分片参数 * @return JobScheduler 任务调度器 */ @Bean(initMethod = "init") public JobScheduler simpleJobScheduler(@Value("${simpleJob.cron}") final String cron, @Value("${simpleJob.shardingTotalCount}") final int shardingTotalCount, @Value("${simpleJob.shardingItemParameters}") final String shardingItemParameters) { return new SpringJobScheduler(simpleJob, regCenter, getLiteJobConfiguration(simpleJob.getClass(), cron, shardingTotalCount, shardingItemParameters), jobEventConfiguration); } /** * * @param jobClass 任务调度类 * @param cron 定时任务cron配置 * @param shardingTotalCount 任务分片数 * @param shardingItemParameters 任务分片参数 * @return LiteJobConfiguration 任务配置 */ private LiteJobConfiguration getLiteJobConfiguration(final Class extends com.dangdang.ddframe.job.api.simple.SimpleJob> jobClass, final String cron, final int shardingTotalCount, final String shardingItemParameters) { return LiteJobConfiguration .newBuilder( new SimpleJobConfiguration(JobCoreConfiguration.newBuilder(jobClass.getName(), cron, shardingTotalCount) .shardingItemParameters(shardingItemParameters).build(), jobClass.getCanonicalName())) .overwrite(true).build(); } }
TestSimpleJob,定时器任务本身
package com.example.demojob.job; import com.dangdang.ddframe.job.api.ShardingContext; import com.dangdang.ddframe.job.api.simple.SimpleJob; import org.springframework.stereotype.Component; @Component public class TestSimpleJob implements SimpleJob { private int count; //任务就是每5秒执行一次控制台输出1,2,3…… @Override public void execute(ShardingContext shardingContext) { count++; System.out.println("task " + count); } }
最后在Docker下安装 Zookeeper
安装脚本compose文件如下
version: '2' services: zookeeper01: image: zookeeper restart: always hostname: zookeeper01 ports: - 2181:2181 environment: ZOO_MY_ID: 1 ZOO_SERVERS: server.1=0.0.0.0:2888:3888 server.2=zookeeper02:2888:3888 server.3=zookeeper03:2888:3888 zookeeper02: image: zookeeper restart: always hostname: zookeeper02 ports: - 2182:2181 environment: ZOO_MY_ID: 2 ZOO_SERVERS: server.1=zookeeper01:2888:3888 server.2=0.0.0.0:2888:3888 server.3=zookeeper03:2888:3888 zookeeper03: image: zookeeper restart: always hostname: zookeeper03 ports: - 2183:2181 environment: ZOO_MY_ID: 3 ZOO_SERVERS: server.1=zookeeper01:2888:3888 server.2=zookeeper02:2888:3888 server.3=0.0.0.0:2888:3888
springboot一种全新的编程规范,其设计目的是用来简化新Spring应用的初始搭建以及开发过程,SpringBoot也是一个服务于框架的框架,服务范围是简化配置文件。
看完上述内容,你们掌握如何在SpringBoot中使用ElaticJob定时器的方法了吗?如果还想学到更多技能或想了解更多相关内容,欢迎关注创新互联行业资讯频道,感谢各位的阅读!