我有一个包含不同记录的平面文件(页眉、记录和页脚)
HR,...
RD,...
FR,...
项目阅读器
@Bean
@StepScope
public FlatFileItemReader reader(@Value("#{jobParameters['inputFileName']}") String inputFileName) {
FlatFileItemReader reader = new FlatFileItemReader();
reader.setResource(new FileSystemResource(inputFileName));
reader.setLineMapper(patternLineMapper());
return reader;
}
@Bean
public LineMapper patternLineMapper() {
PatternMatchingCompositeLineMapper patternLineMapper = new PatternMatchingCompositeLineMapper<>();
tokenizers = new HashMap<String, LineTokenizer>();
try {
tokenizers.put("HR*", headerLineTokenizer());
tokenizers.put("RD*", recordLineTokenizer());
tokenizers.put("FR*", footerLineTokenizer());
} catch (Exception e) {
e.printStackTrace();
}
fieldSetMappers = new HashMap<String, FieldSetMapper>();
fieldSetMappers.put("HR*", new HeaderFieldSetMapper());
fieldSetMappers.put("RD*", new RecordFieldSetMapper());
fieldSetMappers.put("FR*", new FooterFieldSetMapper());
patternLineMapper.setTokenizers(tokenizers);
patternLineMapper.setFieldSetMappers(fieldSetMappers);
return patternLineMapper;
}
它们工作正常,并且 Spring Batch 为每条记录调用适当的读取器,问题是当涉及到项目处理器时,我想使用我得到的相同方法java.lang.ClassCastException
因为 Spring Batch 尝试将域对象 [从阅读器返回] 映射到java.lang.String
项目处理器
@Bean
@StepScope
public ItemProcessor processor() {
ClassifierCompositeItemProcessor processor = new ClassifierCompositeItemProcessor();
PatternMatchingClassifier<ItemProcessor> classifier = new PatternMatchingClassifier<>();
Map<String, ItemProcessor> patternMap = new HashMap<>();
patternMap.put("HR*", new HeaderItemProcessor());
patternMap.put("RD*", new RecordItemProcessor());
patternMap.put("FR*", new FooterItemProcessor());
classifier.setPatternMap(patternMap);
processor.setClassifier(classifier);
return processor;
}
我也用过BackToBackPatternClassifier
但事实证明它有一个错误,当我使用像这样的泛型时ItemWriter<Object>
我收到异常“无法打开文件”。问题是如何使 ItemProcessor 处理从 Reader 返回的不同记录类型?