问题描述
我正在使用MultiResourceItemReader来读取CSV文件列表并将其最终写入数据库中。
@StepScope
@Bean
public MultiResourceItemReader<DailyExport> multiResourceItemReader(@Value("#{stepExecutionContext[listNotLoadedFilesPath]}") List<String> notLoadedFilesPath) {
logger.info("** start multiResourceItemReader **");
// cast List of not loaded files to array of resources
List <Resource>tmpList = new ArrayList<Resource>();
notLoadedFilesPath.stream().forEach(fullPath -> {
Resource resource = new FileSystemResource(fullPath);
tmpList.add(resource);
});
Resource [] resourceArr = tmpList.toArray(new Resource[tmpList.size()]);
MultiResourceItemReader<DailyExport> multiResourceItemReader = new MultiResourceItemReader<>();
multiResourceItemReader.setName("dailyExportMultiReader");
multiResourceItemReader.setDelegate(reader(dailyExportMapper()));
multiResourceItemReader.setResources(resourceArr);
return multiResourceItemReader;
}
@Bean
public FlatFileItemReader<DailyExport> reader(FieldSetMapper<DailyExport> testClassRowMapper) {
logger.info("** start reader **");
// Create reader instance
FlatFileItemReader<DailyExport> reader = new FlatFileItemReaderBuilder<DailyExport>()
.name("dailyExportReader")
.linesToSkip(1).fieldSetMapper(testClassRowMapper)
.delimited().delimiter("|").names(dailyExportMetadata)
.build();
return reader;
}
一切正常,但我还需要存储当前文件\资源名称。
我找到了这个API getCurrentResource,但是我不知道如何使用它。在流程阶段有没有办法获取当前资源?
public class DailyExportItemProcessor implements ItemProcessor<DailyExport,DailyExport>{
@Autowired
public MultiResourceItemReader<DailyExport> multiResourceItemReader;
@Override
public DailyExport process(DailyExport item) throws Exception {
// multiResourceItemReader.getCurrent ??
return item;
}
谢谢
解决方法
ResourceAware是您所需要的,它允许您在项目上设置原始资源,以便可以在处理器(或项目在范围内的任何其他位置)上访问它:
class DailyExport implement ResourceAware {
private Resource resource;
// getter/setter for resource
}
然后在处理器中
public class DailyExportItemProcessor implements ItemProcessor<DailyExport,DailyExport>{
@Override
public DailyExport process(DailyExport item) throws Exception {
Resource currentResource = item.getResource();
// do something with the item/resource
return item;
}
}