[英]How to write this method in a generic way in java
目前,我为五个不同的类实现了这个方法来为五个不同的文本文件配置 FlatFileReader 并加载到数据库表中。
我想知道有没有办法在公共地方实现这个方法,这样我的每个文件都会调用这个方法来配置我的阅读器来读取它们对应的文件..
每个文件都会发送不同的实体类来加载它们的文件。 比如主实体、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);
}
给方法添加泛型
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);
}
如果你想只对列出的实体使用,创建一个由所有具体实体( PrimaryEntity, ChildEntity1, ChildEntity2, ChildEntity3, ChildEntity4
)实现的通用接口 Entity 并将签名更改为
private <T extends Entity> void flatFileItemReaderConfig(...)
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