块大小为n的Spring批处理作业，只写入第n行n次

Question

在此批处理配置中，我在何处/如何创建TEstLayout的新实例？

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {

    @Autowired
    public JobBuilderFactory jobBuilderFactory;

    @Autowired
    public StepBuilderFactory stepBuilderFactory;

    @Bean
    @Qualifier("callTestStep")
    public Step callTestStep(StepBuilderFactory stepBuilders) {
        return stepBuilders.get("callTestStep").tasklet(callTEstPgmTasklet()).build();
    }

    @Bean
    public CallTEstPgm callTEstPgmTasklet() {
        return new CallTEstPgm();
    }

    @Bean
    @Qualifier("clearOutFileStep")
    public Step clearOutFileStep(StepBuilderFactory stepBuilders) {
        return stepBuilders.get("clearOutFile").tasklet(clearOutFileTasklet()).build();
    }

    @Bean
    public ClearOutFile clearOutFileTasklet() {
        return new ClearOutFile();
    }

    // tag::readerwriterprocessor[]
    @Bean
    @Scope("prototype")
    JdbcCollectiveItemReader<TEstLayout> reader(DataSource dataSource) {
        JdbcCollectiveItemReader<TEstLayout> databaseReader = new JdbcCollectiveItemReader<>();
        databaseReader.setDataSource(dataSource);

        databaseReader
                .setSql(“select * from F33416BA order by x_id”)
);

        databaseReader.setRowMapper(new TEstMultitoOneRowMapper());
        return databaseReader;
    }

    @Bean
    public TEstProcessor processor() {
        return new TEstProcessor();
    }

    @Bean
    public JdbcBatchItemWriter<TestBalanceDetailLayout> writer(DataSource dataSource) {
        return new JdbcBatchItemWriterBuilder<TestBalanceDetailLayout>()
                .itemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>())
                .sql("INSERT INTO " + outFileLib.trim() + "/" + outFile.trim() + " Values (:wholeDetailString)")
                .dataSource(dataSource).build();
    }

    @Bean
    public Job BalanceSummary(JobCompletionNotificationListener listener, @Qualifier("callTestStep") Step callTestStep,
            @Qualifier("clearOutFileStep") Step clearOutFileStep,
            /* Step writeHeader, */ @Qualifier("writeDetailStep") Step writeDetailStep /* , Step writeFooter */) {
        return jobBuilderFactory.get("Balance_Summary_File").incrementer(new RunIdIncrementer()).listener(listener)
                .start(callTestStep).next(clearOutFileStep)
                // .next(writeHeader)
                .next(writeDetailStep)
                // .next(writeFooter)
                .build();
    }

    @Bean
    @Qualifier("writeDetailStep")
    public Step writeDetailStep(JdbcBatchItemWriter<TestBalanceDetailLayout> writer,
            JdbcCollectiveItemReader<TEstLayout> reader, TEstProcessor processor) {
        return stepBuilderFactory.get("writeDetail").<TEstLayout, TestBalanceDetailLayout>chunk(chunkSize)
                .reader(reader).processor(processor).writer(writer).build();
    }
}

Answer 1

这不是春豆的问题！是我的错。块处理一直将数据添加到数组列表中，直到达到块大小。在我的processor类中，我在process方法之外创建了output实例。所以在添加到arraylist的同时，它不断替换整个arraylist。

这就是我的块处理器发生的事情。在添加新元素时，ArrayList的所有元素都会发生变化？

我的处理器之前

  public class TestProcessor implements ItemProcessor<TestLayout, TestBalanceDetailLayout> {
                TestBalanceDetailLayout transformedDetail = new TestDetailLayout();
                @Override
            public TestBalanceDetailLayout process(final TestLayout testLayout) throws Exception {  processor code }

      public class TestProcessor implements ItemProcessor<TestLayout, TestBalanceDetailLayout> {

                @Override
            public TestBalanceDetailLayout process(final TestLayout testLayout) throws Exception {
                TestBalanceDetailLayout transformedDetail = new TestDetailLayout();
processor code }