Spring Batch快速上手示例( bean注入和非注入方式 )

概述

快速上手, 以最快的方式和配置运行和了解Spring Batch批处理; 通过bean注入的方式, 可以使用spring-boot-starter-batch进行相关bean的管理和配置

但是这种方式不够灵活, 因为项目不一定在spring的环境中执行，所以需要另一种方式。结合源码不难发现Batch执行Job的核心代码和创建过程

非Bean注入方式

通过人工进行对象的创建

Maven

            org.springframework.batch
            spring-batch-core
            4.3.1
 

Code

public class RunDemo {

    static class MyBatchConfigurer extends DefaultBatchConfigurer {
        @Override
        public void setDataSource(DataSource dataSource) {
        }
    }

    public static void main(String[] args) throws Exception {
        File dataFile = new File("data.json");
        if (!dataFile.exists()) {
            dataFile.createNewFile();
        }
        FileOutputStream os = new FileOutputStream(dataFile);
        os.write("[{\"city\":\"beijing\",\"name\":\"jaychou\"},".getBytes());
        os.write("{\"city\":\"beijing\",\"name\":\"jaychou2\"}]".getBytes());
        os.flush();
        os.close();

        MyBatchConfigurer context = new MyBatchConfigurer();
        context.initialize();

        JsonItemReader

Bean注入方式

Maven

 
      org.springframework.boot
      spring-boot-starter-batch
      2.4.1
  

Code

SpringBatchApplication

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class SpringBatchApplication {
  public static void main(String[] args) {
    SpringApplication.run(SpringBatchApplication.class, args);
  }
}

RunDemo

@Configuration
@EnableBatchProcessing
public class RunDemo {
    @Autowired
    private JobBuilderFactory jobBuilders;
    @Autowired
    private StepBuilderFactory stepBuilders;

    @Component
    static class MyBatchConfigurer extends DefaultBatchConfigurer {
        @Override
        public void setDataSource(DataSource dataSource) {
        }
    }
    @Bean
    public Job demoJob() throws Exception {
        File dataFile = new File("data.json");
        if (!dataFile.exists()) {
            dataFile.createNewFile();
        }
        FileOutputStream os = new FileOutputStream(dataFile);
        os.write("[{\"city\":\"beijing\",\"name\":\"jaychou\"},".getBytes());
        os.write("{\"city\":\"beijing\",\"name\":\"jaychou2\"}]".getBytes());
        os.flush();
        os.close();

        JsonItemReader

补充

如果想要其他的输入和输出, 如KafkaItemReader,KafkaItemWriter, 则需要引入如下的依赖包

    
      org.springframework.batch
      spring-batch-infrastructure
      4.3.1
    

   
      org.apache.kafka
      kafka_2.12
      2.0.1
    

demo运行结果, 会生成output.txt

__{city=beijing, name=jaychou}
__{city=beijing, name=jaychou2}