Spring Batch入门教程篇

 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-batch</artifactId>
</dependency>

@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[]
}