Spring Boot 与 Spring Batch 和 JPA 集成

使用Spring Boot与Spring Batch和JPA集成可以实现批处理任务的高效处理和数据持久化。Spring Boot提供了简化的配置和开发流程，而Spring Batch则是一个强大的批处理框架，可以帮助我们处理大量的数据任务。JPA（Java Persistence API）是Java EE的一部分，也是Spring框架的一部分，它提供了一个对象-关系映射（ORM）的标准，可以实现Java对象与数据库之间的映射。

xml
    
    
        org.springframework.boot
        spring-boot-starter-batch
    
    
    
    
        org.springframework.boot
        spring-boot-starter-data-jpa
    
    
    
    
        com.h2database
        h2
        runtime
    

java
@Configuration
@EnableBatchProcessing
public class BatchConfiguration {
    
    @Autowired
    private JobBuilderFactory jobBuilderFactory;
    
    @Autowired
    private StepBuilderFactory stepBuilderFactory;
    
    @Autowired
    private EntityManagerFactory entityManagerFactory;
    
    @Bean
    public ItemReader reader() {
        JpaPagingItemReader reader = new JpaPagingItemReader<>();
        reader.setEntityManagerFactory(entityManagerFactory);
        reader.setQueryString("SELECT u FROM User u");
        return reader;
    }
    
    @Bean
    public ItemProcessor processor() {
        return user -> {
            // 对用户数据进行处理
            return user;
        };
    }
    
    @Bean
    public ItemWriter writer() {
        return users -> {
            // 将处理后的用户数据写入数据库
        };
    }
    
    @Bean
    public Step step1(ItemReader reader, ItemProcessor processor, ItemWriter writer) {
        return stepBuilderFactory.get("step1")
                .chunk(10)
                .reader(reader)
                .processor(processor)
                .writer(writer)
                .build();
    }
    
    @Bean
    public Job job(Step step1) {
        return jobBuilderFactory.get("job")
                .flow(step1)
                .end()
                .build();
    }
}

java
@SpringBootApplication
public class Application implements CommandLineRunner {
    
    @Autowired
    private JobLauncher jobLauncher;
    
    @Autowired
    private Job job;
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
    
    @Override
    public void run(String... args) throws Exception {
        JobParameters jobParameters = new JobParametersBuilder()
                .addLong("time", System.currentTimeMillis())
                .toJobParameters();
        
        jobLauncher.run(job, jobParameters);
    }
}