目前，我為五個不同的類實現了這個方法，為五個不同的文本文件配置 FlatFileReader 并加載到數據庫表中。我想知道有沒有一種方法可以在一個常見的地方實現這個方法，這樣我的每個文件都會調用這個方法來配置我的閱讀器來讀取它們相應的文件。每個文件都會發送不同的實體類來加載它們的文件。像主要實體、ChildEntity1、ChildEntity2、ChildEntity3、ChildEntity4。private void flatFileItemReaderConfig(FlatFileItemReader<PrimaryEntity> flatFileReader, String fileName, String incomingHeader){ // set delimiter as '|' DefaultLineMapper<PrimaryEntity> defaultLineMapper = new DefaultLineMapper<>(); DelimitedLineTokenizer delimitedLineTokenizer = new DelimitedLineTokenizer("|"); delimitedLineTokenizer.setNames(convertHeaderToEntityAttrib(fileName, incomingHeader)); defaultLineMapper.setLineTokenizer(delimitedLineTokenizer); // convert each record into primaryentity BeanWrapperFieldSetMapper<PrimaryEntity> beanWrapperFieldSetMapper = new BeanWrapperFieldSetMapper<>(); beanWrapperFieldSetMapper.setTargetType(PrimaryEntity.class); beanWrapperFieldSetMapper.setCustomEditors(getCustomFormatters()); defaultLineMapper.setFieldSetMapper(beanWrapperFieldSetMapper); flatFileReader.setLineMapper(defaultLineMapper);}
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向方法中添加泛型
private <T> void flatFileItemReaderConfig(FlatFileItemReader<T> flatFileReader, String fileName, String incomingHeader, Class<T> clazz) {
// set delimiter as '|'
DefaultLineMapper<T> defaultLineMapper = new DefaultLineMapper<>();
DelimitedLineTokenizer delimitedLineTokenizer = new DelimitedLineTokenizer("|");
delimitedLineTokenizer.setNames(convertHeaderToEntityAttrib(fileName, incomingHeader));
defaultLineMapper.setLineTokenizer(delimitedLineTokenizer);
// convert each record into primary entity
BeanWrapperFieldSetMapper<T> beanWrapperFieldSetMapper = new BeanWrapperFieldSetMapper<>();
beanWrapperFieldSetMapper.setTargetType(clazz);
beanWrapperFieldSetMapper.setCustomEditors(getCustomFormatters());
defaultLineMapper.setFieldSetMapper(beanWrapperFieldSetMapper);
flatFileReader.setLineMapper(defaultLineMapper);
}
如果您只想將使用限制為列出的實體，請創建一個由所有具體實體 ( PrimaryEntity, ChildEntity1, ChildEntity2, ChildEntity3, ChildEntity4) 實現的通用接口實體，并將簽名更改為
private <T extends Entity> void flatFileItemReaderConfig(...)
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