easyExcel 公用-简洁【一个excel文档多个sheet 循环读取,适用简单表头】-导入

//监听器

@Slf4j
public class ExcelListener<T extends BaseRowModel> extends AnalysisEventListener<T> {
    private final List<T> rows = new ArrayList<>();
    private String departPro = "";
    @Override
    public void invoke(T object, AnalysisContext analysisContext) {
        rows.add(object);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        log.info("read {} rows %n", rows.size());
    }

    public List<T> getRows() {
        return rows;
    }
}

//循环读取每一页,startNum 代表的是从第几行开始读ExcelUtil文件中
public static <T extends BaseRowModel> List<T> readExcel(final MultipartFile file,final Class<? extends BaseRowModel> clazz,int startNum)  {
   ExcelListener<T> listener = new ExcelListener<>();
    try{
        ExcelReader excelReader = EasyExcel.read(file.getInputStream()).build();
        List<ReadSheet> readSheets = EasyExcel.read(file.getInputStream()).build().excelExecutor().sheetList();
        if (!readSheets.isEmpty()) {
            for (ReadSheet readSheet : readSheets) {
                readSheet = EasyExcel.readSheet(readSheet.getSheetNo()).head(clazz).registerReadListener(listener).headRowNumber(startNum).build();
                excelReader.read(readSheet);
            }
        }
        excelReader.finish();
        if (null == file.getInputStream()) {
            throw new NullPointerException("the inputStream is null!");
        }
    }catch (Exception e){
        log.error("读流出现异常:",e);
        throw new BusinessException(BusinessCodeEnum.EXCEL_FILE_ILLEGA);
    }
    return listener.getRows();
}

//使用
List<User> list=ExcelUtil.readExcel(file,user.class,1);