jXLS 2.3 - 添加侦听器以根据单元格内容更新单元格样式？

Question

AreaListener 有一个 example of the dynamic cell styling for jXLS 1.x, but I can not find anything closer than this example。

我有一个非常基础的XLS生成模板，处理代码就这么简单

context.putVar("headers", columns);
context.putVar("data", cells);
context.getConfig().setCellStyleMap();
JxlsHelper.getInstance().processTemplate(is, result, context);

如何添加一些允许我修改某些单元格样式的侦听器（例如为长度超过 N 个字符的文本添加自动换行，或者如果值具有特定模式则更改背景颜色）？

Answer 1

你可以这样实现

在主要方法中：

        try(InputStream is = HighlightDemo.class.getResourceAsStream("highlight_template.xls")) {
        try (OutputStream os = new FileOutputStream("target/highlight_output.xls")) {
            PoiTransformer transformer = PoiTransformer.createTransformer(is, os);
            AreaBuilder areaBuilder = new XlsCommentAreaBuilder(transformer, false);
            List<Area> xlsAreaList = areaBuilder.build();
            Area mainArea = xlsAreaList.get(0);
            Area loopArea = xlsAreaList.get(0).getCommandDataList().get(0).getCommand().getAreaList().get(0);
            loopArea.addAreaListener(new HighlightCellAreaListener(transformer));
            Context context = new Context();
            context.putVar("employees", employees);
            mainArea.applyAt(new CellRef("Result!A1"), context);
            mainArea.processFormulas();
            transformer.write();
        }
    }

此示例中使用的模板与 Object Collection Demo 示例中的相同。最棘手的部分是找到您要应用 AreaListener 的区域。在这种情况下，我只是从根区域遍历到 EachCommand 区域，我希望在该区域突出显示付款超过 2000 的员工。

AreaListener 实现与 AreaListener example

中的类似

public class HighlightCellAreaListener implements AreaListener {
    private final CellRef paymentCell = new CellRef("Template!C4")
 ...
    public void afterTransformCell(CellRef srcCell, CellRef targetCell, Context context) {
    System.out.println("Source: " + srcCell.getCellName() + ", Target: " + targetCell.getCellName());
    if(paymentCell.equals(srcCell)){ // we are at employee payment cell
        Employee employee = (Employee) context.getVar("employee");
        if( employee.getPayment().doubleValue() > 2000 ){ // highlight payment when >= 00
            logger.info("highlighting payment for employee " + employee.getName());
            highlightCell(targetCell);
            }
        }
    }
private void highlightCell(CellRef cellRef) {
    Workbook workbook = transformer.getWorkbook();
    Sheet sheet = workbook.getSheet(cellRef.getSheetName());
    Cell cell = sheet.getRow(cellRef.getRow()).getCell(cellRef.getCol());
    CellStyle cellStyle = cell.getCellStyle();
    CellStyle newCellStyle = workbook.createCellStyle();
    newCellStyle.setDataFormat( cellStyle.getDataFormat() );
    newCellStyle.setFont( workbook.getFontAt( cellStyle.getFontIndex() ));
    newCellStyle.setFillBackgroundColor( cellStyle.getFillBackgroundColor());
    newCellStyle.setFillForegroundColor(IndexedColors.ORANGE.getIndex());
    newCellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
    cell.setCellStyle(newCellStyle);
}

jXLS 2.3 - 添加侦听器以根据单元格内容更新单元格样式？

jXLS 2.3 - add the listener to update a cell style depending on the cell content?

excel

jxls