一．Job的创建及其应用

1.Job flow的介绍：（1）状态机：例完成step1，是否继续完成step2,step3,我们就需要通过Job flow来控制（2）进行演示:使用next()方法来达到顺序执行step1，step2...的目的，再使用on(),to(),from()方法达到与next()方法同样的目的，再展示fail()方法和stopAndRestart()方法；例1：创建JobFlowDemoOne,以及三个Step使用next()让其顺序执行JobFlowDemOne：

package com.dhcc.batch.batchDemo.config;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class JobFlowDemOne {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    @Bean    public Job JobFlowDemo1() {        return jobBuilderFactory.get("JobFlowDemo1").start(step1()).next(step2()).next(step3()).build();    }    @Bean    public Step step1() {        return stepBuilderFactory.get("step1").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("step1-->Hello Spring Batch....");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step step2() {        return stepBuilderFactory.get("step2").tasklet((contribution, context) -> {            System.out.println("step 2-->Hello Spring Batch..");            return RepeatStatus.FINISHED;        }).build();    }    @Bean    public Step step3() {        return stepBuilderFactory.get("step3").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("step3-->Hello Spring Batch....");                return RepeatStatus.FINISHED;            }        }).build();    }}在step2()中，我们使用了java8的新特性，使用了Lambda表达式package com.dhcc.batch.batchDemo;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class BatchDemoApplication {    public static void main(String[] args) {        SpringApplication.run(BatchDemoApplication.class, args);    }}

开始执行，执行结果为：

观察控制台执行结果，我们可以发现Step1,step2,step3,按照next()的顺序顺序执行完毕，此时我们在进入数据库中进行观察，我们主要观察JobExecution表以及StepExecution表，查看其表数据：JobExecution:StepExecution:在查看一个JobInstance,观察Job实例：例2：我们使用on(),to(),from()方法顺序执行我们的Step,达到与例1相同的效果原代码不变，我们将JobFlowDemo1略作修改（注：我在这里为例方便演示新建了一个数据库）：

@Bean    public Job JobFlowDemo2() {        return jobBuilderFactory.get("JobFlowDemo2")//              .start(step1())//              .next(step2())//              .next(step3())                .start(step1()).on("COMPLETED").to(step2())                .from(step2()).on("COMPLETED").to(step3())                .from(step3()).end()                .build();

观察控制台：

代码执行成功；fail()方法和stopAndRestart()方法后面用到的时候我们在做详细了解

二．Flow的创建及使用

1.flow的介绍：（1）flow是一个Step的集合，他规定了Step与Step之间的转换关系;（2）创建Flow可以达到复用的效果，让其在不同的Job之间进行复用;（3）使用FlowBuilder去创建一个Flow,他和Job类似，使用start(),next()以及end()来运行flow;例：创建JobFlowDemoTwoApplication

package com.dhcc.batch.batchDemo.jobFlowDemoTwo;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class JobFlowDemoTwoApplication {    public static void main(String[] args) {        SpringApplication.run(JobFlowDemoTwoApplication.class, args);    }}

创建step,flow以及Job——》JobFlowDemoTwoConfiguration：

package com.dhcc.batch.batchDemo.jobFlowDemoTwo;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.job.builder.FlowBuilder;import org.springframework.batch.core.job.flow.Flow;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class JobFlowDemoTwoConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    @Bean    public Step jobFlowDemoTwo1() {        return stepBuilderFactory.get("jobFlowDemoTwo1").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello-->jobFlowDemoTwo1");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step jobFlowDemoTwo2() {        return stepBuilderFactory.get("jobFlowDemoTwo2").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello-->jobFlowDemoTwo2");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step jobFlowDemoTwo3() {        return stepBuilderFactory.get("jobFlowDemoTwo3").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello-->jobFlowDemoTwo3");                return RepeatStatus.FINISHED;            }        }).build();    }    // 创建Flow,它是一个Step集合    @Bean    public Flow jobFlowDemoFlow() {        return new FlowBuilder
    
     ("jobFlowDemoFlow")                .start(jobFlowDemoTwo1())                .next(jobFlowDemoTwo2())                .build();    }    //创建一个Job执行Flow以及Step    @Bean    public Job jobFlowDemoTwoJob() {        return  jobBuilderFactory.get("jobFlowDemoTwoJob")                .start(jobFlowDemoFlow())                .next(jobFlowDemoTwo3())                .end()                .build();    }}
    

开始运行，我们观察控制台：

运行结果我们可以看见Job先运行了Flow中的两个Step,然后再运行jobFlowDemoStep3(),与我们设定的顺序一样在数据库中，我们以stepExection表为例观察：看见了3个Step顺序执行完成；三．Spilt多线程并发任务定义及使用1.Spilt异步执行Flow2.举例说明：（1）首先定义两个Flow,在每个Flow中定义一些Step,每一个Step将自身的名字以及当前运行的线程打印出来；（2）创建一个Job使用Spilt异步的启动两个Flow；（3）运行Job,查看结果；例：JobSpiltDemoApplication：

package com.dhcc.batch.batchDemo.jobSpiltDemo;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class JobSpiltDemoApplication {    public static void main(String[] args) {        SpringApplication.run(JobSpiltDemoApplication.class, args);    }}

JobSpiltDemoConfiguration：

package com.dhcc.batch.batchDemo.jobSpiltDemo;import org.springframework.batch.core.Job;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.job.builder.FlowBuilder;import org.springframework.batch.core.job.flow.Flow;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.task.SimpleAsyncTaskExecutor;@Configurationpublic class JobSpiltDemoConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    /**     * 创建job运行Flow,我们利用split(new     * SimpleAsyncTaskExecutor()).add()让flow异步执行,add()中可以添加多个Flow     *      * @return     */    @Bean    public Job SpiltJob() {        return jobBuilderFactory.get("SpiltJob").start(jobSpiltFlow1()).split(new SimpleAsyncTaskExecutor())                .add(jobSpiltFlow2()).end().build();    }    // 创建Flow1    @Bean    public Flow jobSpiltFlow1() {        return new FlowBuilder
    
     ("jobSpiltFlow1")                .start(stepBuilderFactory.get("jobSpiltStep1").tasklet(tasklet()).build())                .next(stepBuilderFactory.get("jobSpiltStep2").tasklet(tasklet()).build()).build();    }    // 创建Flow1    @Bean    public Flow jobSpiltFlow2() {        return new FlowBuilder
     
      ("jobSpiltFlow2")                .start(stepBuilderFactory.get("jobSpiltStep3").tasklet(tasklet()).build())                .next(stepBuilderFactory.get("jobSpiltStep4").tasklet(tasklet()).build()).build();    }    private Tasklet tasklet() {        return new PrintTasklet();    }    // step执行的任务类（可以写为外部类，此处为了方便，我们写为内部类）    private class PrintTasklet implements Tasklet {        @Override        public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {            System.out.println("has been execute on stepName:" + chunkContext.getStepContext().getStepName()                    + ",has been execute on thread:" + Thread.currentThread().getName());            return RepeatStatus.FINISHED;        }    }}
     
    

运行结果：

观察控制台，我们可以看出我们达到了让Step异步执行的目的观察数据库表：

四．决策器的定义及应用

1.Decision：为我们提供下一步执行哪一个Step提供条件决策2.JobExecutionDecider:接口，提供决策条件例：

package com.dhcc.batch.batchDemo.flowDecisionDemo;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class FlowDecisionDemoApplication {    public static void main(String[] args) {        SpringApplication.run(FlowDecisionDemoApplication.class, args);    }}

FlowDecisionDemoConfiguration：

package com.dhcc.batch.batchDemo.flowDecisionDemo;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.job.flow.JobExecutionDecider;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class FlowDecisionDemoConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    //编写Job    @Bean    public Job FlowDecisionJob() {        return jobBuilderFactory.get("FlowDecisionJob")                .start(firstStep()).next(myDecider())                .from(myDecider()).on("EVEN").to(evenStep())                .from(myDecider()).on("ODD").to(oddStep())                .from(oddStep()).on("*").to(myDecider())                .end()                .build();    }    @Bean    public Step firstStep() {        return stepBuilderFactory.get("firstStep").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello firstStep..");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step evenStep() {        return stepBuilderFactory.get("evenStep").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello evenStep..");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step oddStep() {        return stepBuilderFactory.get("oddStep").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello oddStep..");                return RepeatStatus.FINISHED;            }        }).build();    }    //编写决策器    @Bean    public JobExecutionDecider myDecider() {        return new myDecider();    }}

myDecider：

package com.dhcc.batch.batchDemo.flowDecisionDemo;import org.springframework.batch.core.JobExecution;import org.springframework.batch.core.StepExecution;import org.springframework.batch.core.job.flow.FlowExecutionStatus;import org.springframework.batch.core.job.flow.JobExecutionDecider;public class myDecider implements JobExecutionDecider {    private int count=0;    @Override    public FlowExecutionStatus decide(JobExecution jobExecution, StepExecution stepExecution) {        count++;        if(count%2==0) {            return new FlowExecutionStatus("EVEN");        }else {            return new FlowExecutionStatus("ODD");        }    }}

运行结果：

我们观察控制台，分析结果：首先job中先运行firstStep(),然后进入到myDecider中Count++,此时count=1，返回”ODD”,job中执行oddStep(),然后无论什么状态再次进入myDecider中，此时count=2,故返回”EVEN”，下一步执行evenStep();五．Job的嵌套定义及应用1.job可以嵌套使用，嵌套的Job我们将其称为子job,被嵌套的Job我们将其称为父job;2.一个父Job可以有多个子Job;3.子job不能单独运行，需要其父Job去启动;例： NestedJobApplication:

package com.dhcc.batch.batchDemo.nestedJob;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class NestedJobApplication {    public static void main(String[] args) {        SpringApplication.run(NestedJobApplication.class, args);    }}

接下来建立两个子Job，每个子job中有两个Step,一个父job

让父job控制运行子job

ChildJobOneConfiguration:

package com.dhcc.batch.batchDemo.nestedJob;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class ChildJobOneConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    @Bean    public Job childJob1() {        return jobBuilderFactory.get("childJob1")                .start(childJob1Step1())                .next(childJob1Step2())                .build();    }    @Bean    public Step childJob1Step1() {        return stepBuilderFactory.get("childJob1Step1").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello---->childJob1Step1");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step childJob1Step2() {        return stepBuilderFactory.get("childJob1Step2").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello---->childJob1Step2");                return RepeatStatus.FINISHED;            }        }).build();    }}

ChildJobTwoConfiguration:

package com.dhcc.batch.batchDemo.nestedJob;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class ChildJobTwoConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    @Bean    public Job childJob2() {        return jobBuilderFactory.get("childJob2")                .start(childJob2Step1())                .next(childJob2Step2())                .build();    }    @Bean    public Step childJob2Step1() {        return stepBuilderFactory.get("childJob2Step1").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello---->childJob2Step1");                return RepeatStatus.FINISHED;            }        }).build();    }    @Bean    public Step childJob2Step2() {        return stepBuilderFactory.get("childJob2Step2").tasklet(new Tasklet() {            @Override            public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                System.out.println("Hello---->childJob2Step2");                return RepeatStatus.FINISHED;            }        }).build();    }}

ParentJobConfiguration:

package com.dhcc.batch.batchDemo.nestedJob;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.launch.JobLauncher;import org.springframework.batch.core.repository.JobRepository;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.builder.JobStepBuilder;import org.springframework.batch.core.step.builder.StepBuilder;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.transaction.PlatformTransactionManager;@Configurationpublic class ParentJobConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    @Autowired    private Job childJob1;    @Autowired    private Job childJob2;    @Autowired    private JobLauncher jobLauncher;    @Bean    public Job parentJob(JobRepository repository,PlatformTransactionManager transactionManager) {        return jobBuilderFactory.get("parentJob")                .start(parentJobStep())                .next(childJob1(repository, transactionManager))                .next(childJob2(repository, transactionManager))                .build();    }    private Step childJob1(JobRepository repository,PlatformTransactionManager transactionManager) {        return new JobStepBuilder(new StepBuilder("childJob1"))                .job(childJob1)                .launcher(jobLauncher)                .repository(repository)                .transactionManager(transactionManager)                .build();    }    private Step childJob2(JobRepository repository,PlatformTransactionManager transactionManager) {        return new JobStepBuilder(new StepBuilder("childJob2"))                .job(childJob2)                .launcher(jobLauncher)                .repository(repository)                .transactionManager(transactionManager)                .build();    }    @Bean    public Step parentJobStep() {        return stepBuilderFactory.get("parentJobStep")                .tasklet(new Tasklet() {                    @Override                    public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                        System.out.println("Helllo------>parentJobStep..");                        return RepeatStatus.FINISHED;                    }                }).build();    }}

在配置文件中添加

spring.datasource.url=jdbc:mysql://localhost:3306/springbatch?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8&useSSL=falsespring.datasource.username=rootspring.datasource.password=qitao1996spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.schema=classpath:/org/springframework/batch/core/schema-mysql.sqlspring.batch.initialize-schema=alwaysspring.batch.job.names=parentJob

运行结果：

观察控制台，成功运行，我们达到了job嵌套的效果

六．监听器的定义及应用1.Listener:控制Job执行的一种方式2.可以通过接口或者注解实现监听器3.在spring-batch中提供各个级别的监听器接口，从job级别到item级别都有（1）JobExecutionListener(before..,after..);（2）StepExecutionListener(before..,after..);（3）ChunkListener(before..,after..);（4）ItemReaderListener;ItemWriterListener;ItemProcessListener(before..,after..,error..);例： ListenerJobApplication :

package com.dhcc.batch.batchDemo.listenerJob;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class ListenerJobApplication {    public static void main(String[] args) {        SpringApplication.run(ListenerJobApplication.class, args);    }}

创建监听器（通过实现接口实现）

MyJobListener：

package com.dhcc.batch.batchDemo.listenerJob;import org.springframework.batch.core.JobExecution;import org.springframework.batch.core.JobExecutionListener;/** * 实现接口构建监听器 * @author Administrator * */public class MyJobListener implements JobExecutionListener{    @Override    public void beforeJob(JobExecution jobExecution) {        System.out.println(jobExecution.getJobInstance().getJobName()+"before running......");    }    @Override    public void afterJob(JobExecution jobExecution) {        System.out.println(jobExecution.getJobInstance().getJobName()+"before running......");    }}

创建监听器（通过注解实现）

MyChunkListener：

package com.dhcc.batch.batchDemo.listenerJob;import org.springframework.batch.core.annotation.AfterChunk;import org.springframework.batch.core.annotation.BeforeChunk;import org.springframework.batch.core.scope.context.ChunkContext;/** * 使用注解构建监听器 * @author Administrator * */public class MyChunkListener {    @BeforeChunk    public void beforeChunk(ChunkContext context) {        System.out.println(context.getStepContext().getStepName()+"chunk before running.....");    }    @AfterChunk    public void afterChunk(ChunkContext context) {        System.out.println(context.getStepContext().getStepName()+"chunk after running.....");    }}

MyListenerJobConfiguration：

package com.dhcc.batch.batchDemo.listenerJob;import java.util.Arrays;import java.util.List;import org.springframework.batch.core.Job;import org.springframework.batch.core.Step;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.item.ItemReader;import org.springframework.batch.item.ItemWriter;import org.springframework.batch.item.support.ListItemReader;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MyListenerJobConfiguration {    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    //监听Job执行    @Bean    public Job myListenerJob() {        return jobBuilderFactory.get("myListenerJob")                .start(myListenerStep())                .listener(new MyJobListener())                  .build();    }    private Step myListenerStep() {        return stepBuilderFactory.get("myListenerStep")                .
    
     chunk(2)                .faultTolerant()                .listener(new MyChunkListener())                .reader(reader())                .writer(writer())                .build();    }    private ItemReader
      reader() {        return new ListItemReader<>(Arrays.asList("maozedong","zhude","pendehuai","zhouenlai","liushaoqi"));    }    private ItemWriter
      writer() {        return new ItemWriter
     
      () {            @Override            public void write(List
       items) throws Exception {                for(String item:items) {                    System.out.println("Writing item: "+item);                }            }        };    }}
     
    

运行结果：

观察控制台，我们成功的完成了监听任务..七．Job参数初探1.JobParameters作用：在Job运行过程中，可以用来传递信息2.通过”key---->value”键值对的形式传入，在代码中我们通过get(“key”)来获取value值例：JobParametersDemoApplication：

package com.dhcc.batch.batchDemo.jobParametersDemo;import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication@EnableBatchProcessingpublic class JobParametersDemoApplication {    public static void main(String[] args) {        SpringApplication.run(JobParametersDemoApplication.class, args);    }}

创建Job,Step:

JobParametersConfiguretion:

package com.dhcc.batch.batchDemo.jobParametersDemo;import java.util.Map;import org.springframework.batch.core.ExitStatus;import org.springframework.batch.core.Job;import org.springframework.batch.core.JobParameter;import org.springframework.batch.core.Step;import org.springframework.batch.core.StepContribution;import org.springframework.batch.core.StepExecution;import org.springframework.batch.core.StepExecutionListener;import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;import org.springframework.batch.core.scope.context.ChunkContext;import org.springframework.batch.core.step.tasklet.Tasklet;import org.springframework.batch.repeat.RepeatStatus;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class JobParametersConfiguretion implements StepExecutionListener{    @Autowired    private JobBuilderFactory jobBuilderFactory;    @Autowired    private StepBuilderFactory stepBuilderFactory;    private Map
    
      parames;    @Bean    public Job MyParametersJobThree() {        return jobBuilderFactory.get("MyParametersJobThree")                .start(MyParametersJobStep3())                .build();       }    private Step MyParametersJobStep3() {        return stepBuilderFactory.get("MyParametersJobStep3")                .listener(this)                .tasklet(new Tasklet() {                    @Override                    public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {                        System.out.println("parame is: "+parames.get("info"));                        return RepeatStatus.FINISHED;                    }                }).build();    }    @Override    public void beforeStep(StepExecution stepExecution) {        System.out.println(stepExecution.getStepName()+"运行之前...........");        parames = stepExecution.getJobParameters().getParameters();    }    @Override    public ExitStatus afterStep(StepExecution stepExecution) {        System.out.println(stepExecution.getStepName()+"运行之完毕...........");        return null;    }}
    

运行结果：

观察控制台，此处我们没有进行传参;