multipartfile转为excel

可以使用Apache POI库将MultipartFile转换为Excel文件。

以下是一个示例代码片段：

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.Iterator;

public class ExcelUtils {

    public static Workbook multipartFileToWorkbook(MultipartFile multipartFile) throws IOException {
        Workbook workbook = new XSSFWorkbook(multipartFile.getInputStream());
        return workbook;
    }

    public static void workbookToMultipartFile(Workbook workbook, MultipartFile multipartFile) throws IOException {
        workbook.write(multipartFile.getOutputStream());
    }

    public static void iterateWorkbook(Workbook workbook) {
        Iterator<Sheet> sheetIterator = workbook.sheetIterator();
        while (sheetIterator.hasNext()) {
            Sheet sheet = sheetIterator.next();
            Iterator<Row> rowIterator = sheet.rowIterator();
            while (rowIterator.hasNext()) {
                Row row = rowIterator.next();
                Iterator<Cell> cellIterator = row.cellIterator();
                while (cellIterator.hasNext()) {
                    Cell cell = cellIterator.next();
                    switch (cell.getCellType()) {
                        case STRING:
                            System.out.print(cell.getStringCellValue() + "\t");
                            break;
                        case NUMERIC:
                            System.out.print(cell.getNumericCellValue() + "\t");
                            break;
                        case BOOLEAN:
                            System.out.print(cell.getBooleanCellValue() + "\t");
                            break;
                        default:
                    }
                }
                System.out.println("");
            }
        }
    }
}

在此示例中，multipartFileToWorkbook方法将MultipartFile转换为Workbook对象，而workbookToMultipartFile方法将Workbook对象转换回MultipartFile。

iterateWorkbook方法遍历工作簿中的每个单元格并将其打印到控制台。您可以根据需要修改此方法来执行其他操作。