Question

我正在运行一个Spring批处理作业，每当我将块大小增加到大于1的任何值时，让chunk size = n，它只是复制“nth”记录“n”次而不是添加n记录。以下是我的配置，请指点什么？

@Bean
public JobLauncher jobLauncher(JobRepository jobRepository){
    SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
    jobLauncher.setJobRepository(jobRepository);
    return jobLauncher;
}


@Bean
public JobRepository jobRepository(DataSource dataSource, PlatformTransactionManager transactionManager) throws Exception{
    JobRepositoryFactoryBean factoryBean = new JobRepositoryFactoryBean();
    factoryBean.setDataSource(dataSource);
    factoryBean.setTransactionManager(transactionManager);
    factoryBean.setDatabaseType("mysql");
    return factoryBean.getObject();

}


@Bean
public PlatformTransactionManager transactionManager() {
    return new ResourcelessTransactionManager();
}

@Bean
public DataSource dataSource(){
    DriverManagerDataSource datasource = new DriverManagerDataSource();
    datasource.setDriverClassName("com.mysql.jdbc.Driver");
    datasource.setUrl("jdbc:mysql://localhost:3306/mysqltest?useSSL=false");
    datasource.setUsername("user");
    datasource.setPassword("pwd");
    return datasource;
}


@Bean
@Autowired
public Job projectMasterJob(JobBuilderFactory jobs, Step projectMasterDump) {
    return jobs.get("projectMasterJob").incrementer(new RunIdIncrementer())
            .flow(projectMasterDump).end().build();
}


@Bean
@Autowired
public Step projectMasterDump(StepBuilderFactory stepBuilderFactory,
                    FlatFileItemReader projectMasterReader, ItemWriter projectMasterDbWriter) {
    return stepBuilderFactory.get("projectMasterDump")
            .chunk(10).reader(projectMasterReader).writer(projectMasterDbWriter).build();
}

@Bean
@Autowired
public ItemWriter projectMasterDbWriter(DataSource dataSource){
    JdbcBatchItemWriter<ProjectMasterDTO> writer = new JdbcBatchItemWriter<ProjectMasterDTO>();
    writer.setSql(sql);
    writer.setDataSource(dataSource);
    writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>());
    return writer;
}

@Bean
@Autowired
public FlatFileItemReader projectMasterReader(ProjectMasterDTO projectMasterDTO, DataFormatter dataFormatter){
    ExcelItemReader<ProjectMasterDTO> reader = new ExcelItemReader<>();
    reader.setDataFormatter(dataFormatter);
    reader.setBean(projectMasterDTO);
    reader.setMapperFile(new File("../instance-config/projectMapper.json"));
    return reader;
}


@Bean
@Scope("prototype")
public ProjectMasterDTO projectMasterDTO(){
    return new ProjectMasterDTO();
}

Answer 1

在上面的代码中，我不小心将原型bean设置为我的单例阅读器。所以只有一个bean并且它被重用，因为当一个块进程发生时，同一个bean被覆盖，并且集合中的所有“n”对象都指向同一个bean。

每次在阅读器内检索新鲜bean或创建新实例都可以解决问题

Spring Batch块大小创建重复

1 个答案: