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我一直在学习如何使用 jXL API，因为我是新手。我有一个 excel 表，我想根据真/假条件为单元格的数据着色。例如，如果条件为真，则必须为绿色，如果条件失败，则为红色。

我试图在使用 jxl api 将数据写入 excel 工作表时实现这一点。

我一直在尝试完成的代码片段如下。

用于写入 Excel 工作表的代码片段。我创建了一个方法来为每个单元格定义格式属性，而 wcellFormat1 是相同的变量，其类型为 WritableCellFormat。

for(int i=1; i11; i++){
            String srnum = String.valueOf(rnum);
            wsheet.addCell(new jxl.write.Label(1, rc, srnum, wcellFormat1));
            wsheet.addCell(new jxl.write.Label(2, rc, "b", wcellFormat1));
            wsheet.addCell(new jxl.write.Label(3, rc, "c", wcellFormat1));
            wsheet.addCell(new jxl.write.Label(4, rc, "d", wcellFormat1));
            wsheet.addCell(new jxl.write.Label(5, rc, "e", wcellFormat1));
            wsheet.addCell(new jxl.write.Label(6, rc, "f", wcellFormat1));  

            rnum++;
            rc++;   
            System.out.println(""+rnum+"\n"+rc);
        }
        wbook.write();
        wbook.close();

此代码片段用于应用我之前提到的条件。wfontStatus 是 WritableFont 类型，而 fCellstatus 是 WritableCellFormat 类型，我用它来指定格式。

public void formatCellStatus(Boolean b) throws WriteException{

        if(b == true){
            wfontStatus = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.GREEN);
        }else{
            wfontStatus = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.RED);
        }

        fCellstatus = new WritableCellFormat(wfontStatus);
        fCellstatus.setWrap(true);
        fCellstatus.setAlignment(jxl.format.Alignment.CENTRE);
        fCellstatus.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
        fCellstatus.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.MEDIUM, jxl.format.Colour.BLUE2);
    }

我面临的问题是我不了解如何使用上述方法在写入工作表时应用必要的条件。

这个你能帮我吗。谢谢你。

4

2 回答 2

3

该方法应该类似于

public WritableCellFormat createFormatCellStatus(boolean b) throws WriteException{
    Colour colour = (b == true) ? Colour.GREEN : Colour.RED;
    WritableFont wfontStatus = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, colour);
    WritableCellFormat fCellstatus = new WritableCellFormat(wfontStatus);

    fCellstatus.setWrap(true);
    fCellstatus.setAlignment(jxl.format.Alignment.CENTRE);
    fCellstatus.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
    fCellstatus.setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.MEDIUM, jxl.format.Colour.BLUE2);
    return fCellstatus;
}

在创建标签的循环内

for(int i=1; i11; i++){
    String srnum = String.valueOf(rnum);
    wsheet.addCell(new jxl.write.Label(1, rc, srnum, createFormatCellStatus(true)));    //will create green cell
    wsheet.addCell(new jxl.write.Label(2, rc, "b", createFormatCellStatus(false))); //will create red cell
    wsheet.addCell(new jxl.write.Label(3, rc, "c", createFormatCellStatus(false)));
    wsheet.addCell(new jxl.write.Label(4, rc, "d", createFormatCellStatus(true)));
    wsheet.addCell(new jxl.write.Label(5, rc, "e", createFormatCellStatus(false)));
    wsheet.addCell(new jxl.write.Label(6, rc, "f", createFormatCellStatus(true)));  

    rnum++;
    rc++;   
    System.out.println(""+rnum+"\n"+rc);
}
wbook.write();
wbook.close();
于 2013-02-13T07:37:18.863 回答
1

此方法只是更新fCellstatus变量。所以它可以通过以下方式使用：

formatCellStatus(condition);
wsheet.addCell(new jxl.write.Label(columnNumber, rowNumber, "cellvalue", fCellstatus));

我认为让字段参与这样的交互并不是一个好主意。我建议通过以下方式重新实现此方法：

public WritableCellFormat getCellFormatByCondition(boolean condition) {
    if(b == true){
        wfontStatus = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.GREEN);
    }else{
        wfontStatus = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.RED);
    }

    WritableCellFormat result = new WritableCellFormat(wfontStatus);
    result .setWrap(true);
    result .setAlignment(jxl.format.Alignment.CENTRE);
    result .setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
    result .setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.MEDIUM, jxl.format.Colour.BLUE2);
    return result;
}

这种方式使用更干净：

 wsheet.addCell(new jxl.write.Label(columnNumber, rowNumber, "cellvalue", getCellFormat(condition)));

我不得不说，WritableCellFormat为每个单元创建新对象是一种资源浪费。此外，jxl 对单个工作簿中使用的格式数量有限制，因此您将在较大的工作表上遇到格式不正确的问题。

我建议重用格式对象：

private WritableCellFormat GREEN_CELL_FORMAT;
private WritableCellFormat RED_CELL_FORMAT;

private void createFormats() {
    //you'll need to call this before writing workbook
    //JXL has problems with using one format across several workbooks
    WritableFont greenFont = new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.GREEN);
    WritableFont redFont= new WritableFont(WritableFont.createFont("Arial"), WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, Colour.RED);
    GREEN_CELL_FORMAT = getCellFormat(greenFont);
    RED_CELL_FORMAT = getCellFormat(redFont);
}

private WritableCellFormat getCellFormat(WritableFont font) {
    WritableCellFormat result = new WritableCellFormat(font);
    result .setWrap(true);
    result .setAlignment(jxl.format.Alignment.CENTRE);
    result .setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);
    result .setBorder(jxl.format.Border.ALL, jxl.format.BorderLineStyle.MEDIUM, jxl.format.Colour.BLUE2);
    return result;
}

private WritableCellFormat getCellFormatByCondition(boolean condition) {
    return condition ? GREEN_CELL_FORMAT : RED_CELL_FORMAT;
}

因此，每个工作簿只能使用两个 CellFormat 对象。

于 2013-02-13T07:42:12.200 回答