SpringBatch介绍：
SpringBatch 是一个大数据量的并行处理框架。通常用于数据的离线迁移，和数据处理，⽀持事务、并发、流程、监控、纵向和横向扩展，提供统⼀的接⼝管理和任务管理;SpringBatch是SpringSource和埃森哲为了统一业界并行处理标准为广大开发者提供方便开发的一套框架。
官方地址：github.com/spring-projects/spring-batch
快速入门
pom.xml 添加
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-batch</artifactId> </dependency>
创建BatchConfig(可以是其他类名)
@Configuration
@EnableBatchProcessing
public class BatchConfig {
// tag::readerwriterprocessor[]
@Bean
public FlatFileItemReader<Person> flatFileItemReader() {
FlatFileItemReader<Person> reader = new FlatFileItemReader<>();
reader.setResource(new ClassPathResource("sample-data.csv"));
FixedLengthTokenizer fixedLengthTokenizer = new FixedLengthTokenizer();
reader.setLineMapper(new DefaultLineMapper<Person>() {{
setLineTokenizer(new DelimitedLineTokenizer() {{
setNames(new String[]{"firstName", "lastName"});
}});
setFieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
setTargetType(Person.class);
}});
}});
return reader;
}
@Bean
public JdbcPagingItemReader<Person> jdbcPagingItemReader(DataSource dataSource) {
JdbcPagingItemReader<Person> reader = new JdbcPagingItemReader<>();
reader.setDataSource(dataSource);
reader.setFetchSize(100);
reader.setQueryProvider(new MySqlPagingQueryProvider() {{
setSelectClause("SELECT person_id,first_name,last_name");
setFromClause("from people");
setWhereClause("last_name=:lastName");
setSortKeys(new HashMap<String, Order>() {{
put("person_id", Order.ASCENDING);
}});
}});
reader.setParameterValues(new HashMap<String, Object>() {{
put("lastName", "DOE");
}});
reader.setRowMapper(new BeanPropertyRowMapper<>(Person.class));
return reader;
}
@Bean
public JdbcBatchItemWriter<Person> jdbcBatchItemWriter(DataSource dataSource) {
JdbcBatchItemWriter<Person> writer = new JdbcBatchItemWriter<>();
writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>());
writer.setSql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)");
writer.setDataSource(dataSource);
return writer;
}
/*@Bean
public FlatFileItemWriter<Person> flatFileItemWriter(DataSource dataSource) {
FlatFileItemWriter<Person> writer = new FlatFileItemWriter<>();
writer.setAppendAllowed(true);
writer.setEncoding("UTF-8");
// writer.set(dataSource);
return writer;
}*/
// end::readerwriterprocessor[]
// tag::jobstep[]
@Bean
public Job importUserJob(JobBuilderFactory jobBuilderFactory, JobCompletionNotificationListener listener, Step step) {
return jobBuilderFactory.get("importUserJob")
.incrementer(new RunIdIncrementer())
.listener(listener)
.start(step)
.build();
}
@Bean
public Step step1(StepBuilderFactory stepBuilderFactory, PersonItemProcessor processor, ItemWriter jdbcBatchItemWriter, ItemReader flatFileItemReader) {
/*CompositeItemProcessor compositeItemProcessor = new CompositeItemProcessor();
compositeItemProcessor.setDelegates(Lists.newArrayList(processor, processor));*/
return stepBuilderFactory.get("step1")
.<Person, Person>chunk(10)
.reader(flatFileItemReader)
.processor(processor)
.writer(jdbcBatchItemWriter)
.build();
}
// end::jobstep[]
}
Spring Batch的分层架构
Spring Batch执行流程
总结
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