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

处理具有多格式行的多个输入文件。但是当使用

StepBuilderFactory

流写入文件时，我无法动态传递

Resource

文件名。文件名应该是相应的输入文件名。任何帮助将不胜感激。

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

步骤

        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;
}

作者

@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

您可以使项目读取器/写入器具有步骤范围，并使用后期绑定从作业参数或步骤/作业执行上下文注入值。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作业和步骤属性的后期绑定部分找到更多详细信息。