Set up the Spring Batch project


1. Annotation @enablebatchProcessing: Use this annotation to perform batch processing

2. Dependencies of Spring Batch:

<dependency>
<groupId> org.springframework.boot</groupId>
<artifactId>spring-boot-start-batch</artifactId>
</dependency>
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Create a Job

1. Inject the object that created the task object

private JobBuilderFactory jobBuilderFactory;


2. Inject the object that created the Step object

private StepBuilderFactory stepBuilderFactory;


3. Create a task object

Create multiple task objects:

A. The first method

@Bean
public Job ****Job(){// Specify what step the task executesreturn jobBuilderFactory.get("****Job")
.start(step1())
.next(step2())
.next(step3())
.build();
}
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B. In the second method, according to the different states returned by each step operation, decide whether to enter the next step or carry out other processing processes. :

@Bean
public Job ****Job(){// Specify what step the task executesreturn jobBuilderFactory.get("****Job")
.start(step1())
.on("completed").to(step2())
.from(step2()).on("completed").to(step3()) // fail()    stopAndRestart
.from(step3()).end()
.build();
}
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Create a step object:

@Bean
public Step step1() {return stepBuilderFactory.get("step1")
                .tasklet(new Tasklet() {
                    @Override
                    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
                        System.out.println("Hello Spring Batch");
                        return RepeatStatus.FINISHED;
                    }
                }).build();
}
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4. Replace the Spring Batch database with the mysql data source





SQL > alter table spring Batch job; Demo using mysql # spring. The datasource. Schema = classpath: / org/springframework/batch/core/schema – mysql. SQL spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect

#spring.batch.initialize-schema=always

Job #spring.batch.job. Enabled = false

 
 
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