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本文链接：https://gudepeng.github.io/note/2019/12/08/elasticjob/
demo样例：https://github.com/gudepeng/demoproject/tree/master/elastic-job

1.引包

<dependency>
    <groupId>com.dangdang</groupId>
    <artifactId>elastic-job-lite-core</artifactId>
    <version>2.1.5</version>
    <exclusions>
        <exclusion>
            <artifactId>*</artifactId>
            <groupId>org.apache.curator</groupId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
    <version>2.13.0</version>
</dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-recipes</artifactId>
    <version>2.13.0</version>
</dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-x-discovery</artifactId>
    <version>2.13.0</version>
</dependency>

2.编写配置类

@Configuration
@ConfigurationProperties(prefix = "elasticjob")
public class ElasticJobConfig {

    /**
     * 连接Zookeeper服务器的列表. 包括IP地址和端口号. 多个地址用逗号分隔. 如: host1:2181,host2:2181
     */
    private String serverLists;

    /**
     * 命名空间
     */
    private String namespace;


    @Bean(initMethod = "init")
    public ZookeeperRegistryCenter zookeeperRegistryCenter() {
        ZookeeperConfiguration zookeeperConfiguration = new ZookeeperConfiguration(serverLists, namespace);
        return new ZookeeperRegistryCenter(zookeeperConfiguration);
    }

    public String getServerLists() {
        return serverLists;
    }

    public void setServerLists(String serverLists) {
        this.serverLists = serverLists;
    }

    public String getNamespace() {
        return namespace;
    }

    public void setNamespace(String namespace) {
        this.namespace = namespace;
    }

}

3.编写执行代码

public class MyElasticJob implements SimpleJob {
    @Override
    public void execute(ShardingContext shardingContext) {
        System.out.println("AAAAAAAAA");
    }
}

集成SimpleJob类，如果是其他类型任务，请集成其他类

4.编写注册执行器

@Component
public class ElasticJobHandler {
    @Autowired
    private ZookeeperRegistryCenter registryCenter;

    @PostConstruct
    public void addJob(){
        JobCoreConfiguration simpleCoreConfig = JobCoreConfiguration.newBuilder("demoSimpleJob", "0/15 * * * * ?", 10).build();
        // 定义SIMPLE类型配置
        SimpleJobConfiguration simpleJobConfig = new SimpleJobConfiguration(simpleCoreConfig, MyElasticJob.class.getCanonicalName());
        // 定义Lite作业根配置
        LiteJobConfiguration simpleJobRootConfig = LiteJobConfiguration.newBuilder(simpleJobConfig).build();

        new JobScheduler(registryCenter, simpleJobRootConfig).init();
    }
}

5.创建任务监听器

public class ElasticJobListener extends AbstractDistributeOnceElasticJobListener {
    public ElasticJobListener(long startedTimeoutMilliseconds, long completedTimeoutMilliseconds) {
        super(startedTimeoutMilliseconds, completedTimeoutMilliseconds);
    }

    @Override
    public void doBeforeJobExecutedAtLastStarted(ShardingContexts shardingContexts) {
        System.out.println("before");
    }

    @Override
    public void doAfterJobExecutedAtLastCompleted(ShardingContexts shardingContexts) {
        System.out.println("after");
    }
}

可以实现ElasticJobListener类，或者集成AbstractDistributeOnceElasticJobListener类。
ElasticJobListener：每个节点任务执行，都会执行ElasticJobListener实现的方法。
AbstractDistributeOnceElasticJobListener：只有一个节点执行。
定义bean

 @Bean
    public MyElasticJobListener myElasticJobListener(){
        return new MyElasticJobListener(0,0);
    }

编写完监听器后，需要添加到执行器内。

@Autowired
private MyElasticJobListener myElasticJobListener;
...
new JobScheduler(registryCenter, simpleJobRootConfig,myElasticJobListener).init();
...