将 Excel 文件合并到单个工作簿中

Question

我需要将所有单独的 excel 文件复制到一个工作簿中，并在我使用 ASPOSE API 的地方由选项卡分隔。但它是付费的。

我见过另一个 API，它是单元到单元的复制，但它很耗时。我没有找到任何 API 可以直接从工作表中复制。

有没有办法直接从一张纸复制到另一张纸？

Answer 1

这是一个示例，假设目录包含扩展名为 .xlsx 的文件，并且每个文件都有一个工作表。

您将需要以下导入：

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

在示例中，请阅读代码 cmets：

public static void main(String[] args) {
    // provide a path to a folder containing xlsx-workbooks
    Path folderWithWorkbooks = Paths.get("Y:\\our\\path\\to\\a\\folder\\with\\workbooks");
    // provide a workbook object to be written to
    Workbook resultWorkbook = new XSSFWorkbook();

    try {
        // get the file system objects in that folder
        Files.newDirectoryStream(folderWithWorkbooks).forEach(p -> {
            // and if one is an xlsx-workbook
            if (p.getFileName().toString().endsWith(".xlsx")) {
                // try to read its contents
                try (FileInputStream fis = new FileInputStream(p
                                                              .toAbsolutePath()
                                                              .toString())) {
                    // create the workbook to be parsed
                    Workbook currentWorkbook = new XSSFWorkbook(fis);
                    // get the FIRST sheet (adjust code here if you want more sheets)
                    Sheet sourceSheet = currentWorkbook.getSheetAt(0);
                    // create a new sheet in the result workbook, name pointing to its origin
                    Sheet resultSheet = resultWorkbook.createSheet("from "
                                                           + p.getFileName().toString());

                    // then classicly loop through the rows and cells and copy the contents
                    for (int r = 0; r < sourceSheet.getPhysicalNumberOfRows(); r++) {
                        Row sourceRow = sourceSheet.getRow(r);
                        Row resultRow = resultSheet.createRow(r);

                        for (int c = 0; c < sourceRow.getPhysicalNumberOfCells(); c++) {
                            Cell sourceCell = sourceRow.getCell(c);
                            Cell resultCell = resultRow.createCell(c);

                            // copy contents with respect to their types
                            switch (sourceCell.getCellType()) {
                            case NUMERIC:
                                resultCell.setCellValue(sourceCell.getNumericCellValue());
                                break;
                            case STRING:
                                resultCell.setCellValue(sourceCell.getStringCellValue());
                                break;
                            case FORMULA:
                                resultCell.setCellValue(sourceCell.getCellFormula());
                                break;
                            case BOOLEAN:
                                resultCell.setCellValue(sourceCell.getBooleanCellValue());
                                break;
                            case ERROR:
                                resultCell.setCellValue(sourceCell.getErrorCellValue());
                                break;
                            case BLANK:
                            case _NONE:
                                resultCell.setCellValue(sourceCell.getStringCellValue());
                                break;
                            }
                        }
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        // write the result workbook to the same folder
        FileOutputStream fos = new FileOutputStream(folderWithWorkbooks
                .resolve("result.xlsx")
                .toAbsolutePath()
                .toString());
        resultWorkbook.write(fos);
        fos.flush();
        fos.close();
        resultWorkbook.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

结果将是同一目录中名称为 result.xlsx 的工作簿。

请注意，这不会复制任何单元格格式或样式。您必须在复制单元格值的部分中为其添加代码。