SpringBatch 系列入门之 Tasklet

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-batch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

public class MessageTasklet implements Tasklet {
    @Override
    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
        String message = (String) chunkContext.getStepContext().getJobParameters().get("message");
        ExecutionContext jobContext = chunkContext.getStepContext().getStepExecution().getJobExecution().getExecutionContext();
		
        jobContext.put("message", message);
		//打印传入的参数
        System.out.println(message);
        return RepeatStatus.FINISHED;
    }
}

@Configuration
public class TaskletJobConfiguration {
    @Autowired
    private JobBuilderFactory jobs;
    @Autowired
    private StepBuilderFactory steps;
    @Bean
    public Job taskletJob() {
        return this.jobs.get("taskletJob")
                .start(step())
                .build();
    }
    @Bean
    protected Step step() {
        return steps
                .get("step")
                .tasklet(messageTasklet())
                .build();
    }
    @Bean
    public MessageTasklet messageTasklet() {
        MessageTasklet tasklet = new MessageTasklet();
        return tasklet;
    }
}

#初始化Spring Batch 数据表
spring.batch.initialize-schema=always
#工程启动时不执行任务
spring.batch.job.enabled=false
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull
spring.datasource.username=username
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.hikari.pool-name=HikariPool
#最大连接数，小于等于0会被重置为默认值10；大于零小于1会被重置为minimum-idle的值
spring.datasource.hikari.maximum-pool-size=10
#连接超时时间:毫秒，小于250毫秒，否则被重置为默认值30秒
spring.datasource.hikari.connection-timeout=60000
#最小空闲连接，默认值10，小于0或大于maximum-pool-size，都会重置为maximum-pool-size
spring.datasource.hikari.minimum-idle=10
#空闲连接超时时间，默认值600000（10分钟），大于等于max-lifetime且max-lifetime>0，会被重置为0；不等于0且小于10秒，会被重置为10秒。
# 只有空闲连接数大于最大连接数且空闲时间超过该值，才会被释放
spring.datasource.hikari.idle-timeout=500000
#连接最大存活时间.不等于0且小于30秒，会被重置为默认值30分钟.设置应该比mysql设置的超时时间短
spring.datasource.hikari.max-lifetime=540000
#连接测试查询
spring.datasource.hikari.connection-test-query=SELECT 1

@RestController
@Slf4j
public class JobLauncherController {
    @Autowired
    JobLauncher jobLauncher;
    @Autowired
    Job job;
    @RequestMapping("/launchjob")
    public String handle() throws Exception {
        String parameter = UUID.randomUUID().toString();
        try {
            //接口每次都重新生成一个ＵＵＩＤ，如果参数完全相同，日志会提示任务已经执行成功，不能重复执行
            JobParameters jobParameters = new JobParametersBuilder().addString("message", "Welcome To Spring Batch World!" + parameter)
                    .toJobParameters();
            jobLauncher.run(job, jobParameters);
        } catch (Exception e) {
            log.error("", e);
        }
        return parameter;
    }
}

@Component
public class InterceptingJobExecution implements JobExecutionListener {
    @Override
    public void beforeJob(JobExecution jobExecution) {
        System.out.println("Intercepting Job Execution - Before Job!");
    }
    @Override
    public void afterJob(JobExecution jobExecution) {
        System.out.println("Intercepting Job Execution - after Job!");
    }
}

@Autowired
    InterceptingJobExecution interceptingJobExecution;
@Bean
    public Job taskletJob() {
        return this.jobs.get("taskletJob")
                .start(step()).listener(interceptingJobExecution)
                .build();
    }