elastic-job+zookeeper实现分布式定时任务调度的使用（springboot版本）

总体思路，要确认一个定时任务需要一个cron表达式+jobDetail；

现在要让实现定时任务的协调，则就让zookeeper，简单说就是需要3要素，zk对象+cron+jobDetail；

总的项目结构

1、maven引入依赖

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

   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
   </dependency>
   <dependency>
      <groupId>com.dangdang</groupId>
      <artifactId>elastic-job-lite-core</artifactId>
      <version>2.1.5</version>
   </dependency>
   <dependency>
      <groupId>com.dangdang</groupId>
      <artifactId>elastic-job-lite-spring</artifactId>
      <version>2.1.5</version>
   </dependency>
   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
   </dependency>
</dependencies>

application.properties如下：

server.port=8766
spring.application.name=scheduler-service

regCenter.serverList = localhost:2181
regCenter.namespace = elastic-job-lite-springboot

stockJob.cron = 0/5 * * * * ?

stockJob.shardingTotalCount = 2

stockJob.shardingItemParameters = 0=Chengdu0,1=Chengdu1

其中

stockJob.cron为定时任务的cron表达式；

stockJob.shardingTotalCount为任务的分数量（即同时同时开几个定时任务）；

stockJob.shardingItemParameters为任务分片携带的参数；

 要素1-zookeeper
创建一个bean，用来配置zk

package com.example.elasticjobdemo.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;

@Configuration
@ConditionalOnExpression("'${regCenter.serverList}'.length() > 0")
public class JobRegistryCenterConfig {

    @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));
    }

}

创建一个任务，jobdetail

package com.example.elasticjobdemo.config;

import com.dangdang.ddframe.job.api.ShardingContext;
import com.dangdang.ddframe.job.api.simple.SimpleJob;
import org.springframework.beans.factory.annotation.Autowired;

public class StockSimpleJob implements SimpleJob {

    @Override
    public void execute(ShardingContext shardingContext) {
        System.out.println(String.format("------Thread ID: %s, 任务总片数: %s, " +
                        "当前分片项: %s.当前参数: %s,"+
                        "当前任务名称: %s.当前任务参数: %s"
                ,
                Thread.currentThread().getId(),
                shardingContext.getShardingTotalCount(),
                shardingContext.getShardingItem(),
                shardingContext.getShardingParameter(),
                shardingContext.getJobName(),
                shardingContext.getJobParameter()

        ));

    }
}

再创建一个类，把3要素连接起来

package com.example.elasticjobdemo.config;

import com.dangdang.ddframe.job.api.simple.SimpleJob;
import com.dangdang.ddframe.job.config.JobCoreConfiguration;
import com.dangdang.ddframe.job.config.simple.SimpleJobConfiguration;
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 org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class StockJobConfig {

    @Autowired
    private JobRegistryCenterConfig jobRegistryCenterConfig;
    @Autowired
    private ZookeeperRegistryCenter regCenter;

    public StockJobConfig() {
    }

    @Bean
    public SimpleJob stockJob(){
        return new StockSimpleJob();
    }

    @Bean(initMethod = "init")
    public JobScheduler simpleJobScheduler(final SimpleJob simpleJob, @Value("${stockJob.cron}") final String cron, @Value("${stockJob.shardingTotalCount}") final int shardingTotalCount,
                                           @Value("${stockJob.shardingItemParameters}") final String shardingItemParameters) {
        return new SpringJobScheduler(simpleJob, regCenter, getLiteJobConfiguration(simpleJob.getClass(), cron, shardingTotalCount, shardingItemParameters));
    }

    /**
     *@Description  任务配置类
     */
    private LiteJobConfiguration getLiteJobConfiguration(final Class<? extends 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();

    }
}

boot任务启动后的效果（需要先启动zk,这里我填了分片数为2）