Spring Boot + Spring Batch 实现批处理任务，保姆级教程！

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.scope.context.ChunkContext;
import org.springframework.batch.core.step.tasklet.Tasklet;
import org.springframework.batch.item.ItemWriter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
 
@Component
public class SampleBatchJobConfig {
 
    private final JobBuilderFactory jobs;
    private final StepBuilderFactory steps;
    private final JobLauncher jobLauncher;
 
    @Autowired
    public SampleBatchJobConfig(JobBuilderFactory jobs, StepBuilderFactory steps, JobLauncher jobLauncher) {
        this.jobs = jobs;
        this.steps = steps;
        this.jobLauncher = jobLauncher;
    }
 
    @Autowired
    private ItemWriter<String> itemWriter;
 
    @Autowired
    private Tasklet tasklet;
 
    public Job sampleJob() {
        return jobs.get("sampleJob")
                .start(sampleStep())
                .build();
    }
 
    private Step sampleStep() {
        return steps.get("sampleStep")
                .tasklet(tasklet)
                .build();
    }
 
    public void launch() {
        try {
            jobLauncher.run(sampleJob(), new JobParameters());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

这个代码示例展示了如何在Spring Boot应用中使用Spring Batch来定义和运行一个简单的批处理任务。首先，我们注入了JobBuilderFactory和StepBuilderFactory来创建作业和步骤。ItemWriter和Tasklet接口被用来执行实际的任务。最后，我们定义了一个sampleJob方法来创建作业，并且可以通过launch方法来启动它。这个例子展示了如何将Spring Batch集成到Spring Boot项目中，并提供了一个简单的批处理任务执行框架。