spring-batch - 在 SpringBatch 中使用 ClassifierCompositeItemProcessor 时，通过 StepBuilderFactory stream() 将文件名动态传递给 FlatFileItemWriter

Question

我正在使用ClassifierCompositeItemProcessor. 但是当使用StepBuilderFactory流写入文件时，我无法Resource动态传递文件名。文件名应该是相应的输入文件名。任何帮助将非常感激。

输入文件 1 (data-111111-12323.txt)

1#9999999#00001#2#RecordType1
2#00002#June#Statement#2020#9#RecordType2
3#7777777#RecordType3

输入文件 2 (data-22222-23244.txt)

1#435435#00002#2#RecordType1
2#345435#July#Statement#2021#9#RecordType2
3#645456#RecordType3

预期的输出文件 1 (data-111111-12323.txt)

1#9999999#00001#2#RecordType1#mobilenumber1
2#00002#June#Statement#2020#9#RecordType2#mobilenumber2
3#7777777#RecordType3#mobilenumber3

预期输出文件 2 (data-22222-23244.txt)

1#9999999#00001#2#RecordType1#mobilenumber1
2#00002#June#Statement#2020#9#RecordType2#mobilenumber2
3#7777777#RecordType3#mobilenumber3

步

        public Step partitionStep() throws Exception {
            ItemReader reader = context.getBean(FlatFileItemReader.class);
            ClassifierCompositeItemWriter writer = context.getBean(ClassifierCompositeItemWriter.class);
            return stepBuilderFactory.get("statementProcessingStep.slave").<String, String>chunk(12).reader(reader).processor(processor()).writer(writer)
                    .stream(recordType0FlatFileItemWriter())
                    .stream(recordType1FlatFileItemWriter())
                    .build();
                }

处理器

@Bean
    @StepScope
    public ItemProcessor processor() {
            ClassifierCompositeItemProcessor<? extends RecordType, ? extends RecordType> processor = new ClassifierCompositeItemProcessor<>();
SubclassClassifier classifier = new SubclassClassifier();
        Map typeMap = new HashMap();
        typeMap.put(RecordType0.class, recordType0Processor);
        typeMap.put(RecordType1.class, recordType1Processor);
classifier.setTypeMap(typeMap);
        processor.setClassifier(classifier);
return processor;
}

作家

@Bean
    public FlatFileItemWriter<RecordType1> recordType1FlatFileItemWriter() throws Exception{
        FlatFileItemWriter<RecordType1> writer = new FlatFileItemWriter<>();
        writer.setResource( new FileSystemResource("record1.txt")); //This filename should be dynamic
        writer.setAppendAllowed(true);
        writer.setLineAggregator(new DelimitedLineAggregator<RecordType1>() {{
            setDelimiter("#");
            setFieldExtractor(new BeanWrapperFieldExtractor<RecordType1>() {
                {
                    setNames(new String[] { "RecordType", "ID1", "ID2", "ID3"});
                }
            });
        }});
        return  writer;
    }

Answer 1

您可以使您的项目读取器/写入器具有步进范围，并使用后期绑定从作业参数或步骤/作业执行上下文中注入值。例如：

@StepScope
@Bean
public FlatFileItemReader flatFileItemReader(@Value("#{jobParameters['input.file.name']}") String name) {
   return new FlatFileItemReaderBuilder<Foo>()
        .name("flatFileItemReader")
        .resource(new FileSystemResource(name))
        .build();
}

您可以在参考文档的后期绑定作业和步骤属性部分找到更多详细信息。