java - 在 jExcel API 中创建多个工作表

Question

如果一张表已满 (65536 行)，我需要使用 jExcel API 在 Java 中创建多个 excel 表。假设如果一张纸写满了，那么在下一张纸中它应该从第一张纸停止的地方自动开始书写。我只是坚持将逻辑放在一张纸已满时动态创建它。以下是我到目前为止完成的代码。

public void write() throws IOException, WriteException {
    File file = new File(inputFile);
    WorkbookSettings wbSettings = new WorkbookSettings();

    wbSettings.setLocale(new Locale("en", "EN"));

    WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);

    writingToExcel(workbook);
}


//Logic to create sheet dyanmically if one is full should be done here I guess?
private void writingToExcel(WritableWorkbook workbook) {

    workbook.createSheet("Report", 0);
    WritableSheet excelSheet = workbook.getSheet(0);
    try {
        createLabel(excelSheet);
        createContent(excelSheet);
    } catch (WriteException e) {
        e.printStackTrace();
    } finally {
        try {
            workbook.write();
            workbook.close();   
        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriteException e) {
            e.printStackTrace();
        }

    }
}

private void createLabel(WritableSheet sheet) throws WriteException {

    WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
    times = new WritableCellFormat(times10pt);
    times.setWrap(true);

    WritableFont times10ptBoldUnderline = new WritableFont(WritableFont.TIMES, 10, WritableFont.BOLD, false,UnderlineStyle.SINGLE);
    timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline);
    timesBoldUnderline.setWrap(true);

    CellView cv = new CellView();
    cv.setFormat(times);
    cv.setFormat(timesBoldUnderline);
    cv.setAutosize(true);

    // Write a few headers
    addCaption(sheet, 0, 0, "Header 1");
    addCaption(sheet, 1, 0, "This is another header");

}

private void createContent(WritableSheet sheet) throws WriteException,
        RowsExceededException {

    for (int i = 1; i < 70000; i++) {
        addNumber(sheet, 0, i, i + 10);
        addNumber(sheet, 1, i, i * i);
    }
}

private void addCaption(WritableSheet sheet, int column, int row, String s)
        throws RowsExceededException, WriteException {
    Label label;
    label = new Label(column, row, s, timesBoldUnderline);
    sheet.addCell(label);
}

private void addNumber(WritableSheet sheet, int column, int row,
        Integer integer) throws WriteException, RowsExceededException {
    Number number;
    number = new Number(column, row, integer, times);
    sheet.addCell(number);
}

我不确定如何在我的代码中添加该逻辑。

有什么建议会有很大帮助吗？

或者无论如何，谁能给我一个简单的例子，如果一张纸已满，它应该自动开始写入另一张纸(第二张纸)？

Answer 1

我对以下两种方法进行了更改:-

private void writingToExcel(WritableWorkbook workbook) {
    try {
        // don't create a sheet now, instead, pass it in the workbook
        createContent(workbook);
    }
    catch (WriteException e) {
        e.printStackTrace();
    }
    finally {
        try {
            workbook.write();
            workbook.close();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        catch (WriteException e) {
            e.printStackTrace();
        }

    }
}

// instead of taking a sheet, take a workbook because we cannot ensure if the sheet can fit all the content at this point
private void createContent(WritableWorkbook workbook) throws WriteException {

    int excelSheetIndex = 0;
    int rowIndex = 0;
    WritableSheet excelSheet = null;

    for (int i = 1; i < 70000; i++) {

        // if the sheet has hit the cap, then create a new sheet, new label row and reset the row count
        if (excelSheet == null || excelSheet.getRows() == 65536) {
            excelSheet = workbook.createSheet("Report " + excelSheetIndex, excelSheetIndex++);
            createLabel(excelSheet);
            rowIndex = 0;
        }

        // instead of using i for row, use rowIndex
        addNumber(excelSheet, 0, rowIndex, i + 10);
        addNumber(excelSheet, 1, rowIndex, i * i);

        // increment the sheet row
        rowIndex++;
    }
}