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实践内容
从 MariaDB 一张表内读 10 万条记录,经处理后写到 MongoDB 。
具体实现
1、新建 Spring Boot 应用,依赖如下:
org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-logging org.springframework.boot spring-boot-starter-tomcat org.springframework.boot spring-boot-starter-undertow org.springframework.boot spring-boot-starter-log4j2 org.springframework.boot spring-boot-starter-data-mongodb org.springframework.boot spring-boot-starter-batch org.mariadb.jdbc mariadb-java-client 2.0.2 org.projectlombok lombok 1.16.14
2、创建一张表,并生成 10 万条数据
DROP TABLE people IF EXISTS; CREATE TABLE people ( id BIGINT IDENTITY NOT NULL PRIMARY KEY, first_name VARCHAR(20), last_name VARCHAR(20) );
3、创建 Person 类
@Data public class Person { private Long id; private String lastName; private String firstName; }
4、创建一个中间处理器 PersonItemProcessor
import org.springframework.batch.item.ItemProcessor; @Log4j2 public class PersonItemProcessor implements ItemProcessor{ @Override public Person process(final Person person) throws Exception { final String firstName = person.getFirstName().toUpperCase(); final String lastName = person.getLastName().toUpperCase(); final Person transformedPerson = new Person(firstName, lastName); log.info("Converting (" + person + ") into (" + transformedPerson + ")"); return transformedPerson; } }
5、创建 PersonMapper
,用户数据库映射
public class PersonMapper implements RowMapper { private static final String ID_COLUMN = "id"; private static final String NICKNAME_COLUMN = "first_name"; private static final String EMAIL_COLUMN = "last_name"; @Override public Object mapRow(ResultSet resultSet, int i) throws SQLException { Person user = new Person(); person.setId(resultSet.getLong(ID_COLUMN)); person.setNickname(resultSet.getString(NICKNAME_COLUMN)); person.setEmail(resultSet.getString(EMAIL_COLUMN)); return person; } }
6、创建任务完成的监听 JobCompletionNotificationListener
@Log4j2 @Component public class JobCompletionNotificationListener extends JobExecutionListenerSupport { @Override public void afterJob(JobExecution jobExecution) { if(jobExecution.getStatus() == BatchStatus.COMPLETED) { log.info("!!! JOB FINISHED! Time to verify the results"); } } }
7、构建批处理任务 BatchConfiguration
@Configuration @EnableBatchProcessing public class BatchConfiguration { @Autowired public JobBuilderFactory jobBuilderFactory; @Autowired public StepBuilderFactory stepBuilderFactory; @Autowired public DataSource dataSource; @Autowired public MongoTemplate mongoTemplate; @Bean public JdbcCursorItemReaderreader(){ JdbcCursorItemReader itemReader = new JdbcCursorItemReader (); itemReader.setDataSource(dataSource); itemReader.setSql("select id, nickname, email from people"); itemReader.setRowMapper(new PersonMapper()); return itemReader; } @Bean public PersonItemProcessor processor() { return new PersonItemProcessor(); } @Bean MongoItemWriter writer(){ MongoItemWriter itemWriter = new MongoItemWriter (); itemWriter.setTemplate(mongoTemplate); itemWriter.setCollection("branch"); return itemWriter; } @Bean public Step step() { return stepBuilderFactory.get("step") . chunk(10) .reader(reader()) .processor(processor()) .writer(writer()) .build(); } @Bean public Job importUserJob(JobCompletionNotificationListener listener) { return jobBuilderFactory.get("importUserJob") .incrementer(new RunIdIncrementer()) .listener(listener) .flow(step()) .end() .build(); } }
任务处理结果
0出错,耗时 2 分钟左右,测试机 Mac
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