SpringBoot：解析excel

解析Excel文件，可以使用Apache POI库

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.2</version>
</dependency>

上代码：

/**
 * <b>Function: </b> todo
 *
 * @program: 解析excel文件
 * @Package: com.kingbal.king.dmp
 * @author: dingcho
 * @date: 2024/09/18
 * @version: 1.0
 * @Copyright: 2024 www.kingbal.com Inc. All rights reserved.
 */
@Slf4j
@Service
public class ExcelServiceImpl implements IExcelService {
 
    @Override
    public List<List<String>> readExcel(MultipartFile file) throws IOException {
        List<List<String>> data = Lists.newArrayList();
        Workbook workbook = new XSSFWorkbook(file.getInputStream());
        Sheet sheet = workbook.getSheetAt(0);
        Iterator<Row> rowIterator = sheet.iterator();
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            List<String> rowData = new ArrayList<>();
            Iterator<Cell> cellIterator = row.iterator();
            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
                rowData.add(getCellValueAsString(cell));
            }
            data.add(rowData);
        }
        workbook.close();
        return data;
    }
 
    private String getCellValueAsString(Cell cell) {
        switch (cell.getCellTypeEnum()) {
            case STRING:
                return cell.getStringCellValue();
            case NUMERIC:
                return String.valueOf(cell.getNumericCellValue());
            case BOOLEAN:
                return String.valueOf(cell.getBooleanCellValue());
            default:
                return "";
        }
    }
}

readExcel方法接受一个MultipartFile类型的参数，这是Spring MVC中处理文件上传的类型。然后使用Apache POI的Workbook和Sheet类来读取Excel文件，并迭代每一行和每一个单元格，将单元格的值转换为字符串并存储到结果列表中。

要注意的是，这个例子假设Excel文件是XLSX格式，如果需要处理旧的XLS格式

请使用HSSFWorkbook代替XSSFWorkbook