使用 apache poi 更改单元格颜色

java excel apache-poi

2022-09-01 17:31:10

我正在使用Apache POI读取零件编号电子表格中的数据。我在数据库中查找零件编号，如果我们有零件的CAD图纸，我将零件编号单元格涂成绿色，如果我们不这样做，我将其涂成红色。处理完成后，将保存电子表格。我遇到的问题是，该列中的每个单元格都显示为绿色。我已经逐步执行了代码，查找部件号的逻辑工作正常，确定单元格应该是什么颜色以及设置颜色和填充的逻辑似乎也有效。任何想法，我在这里做错了什么？

谢谢。

//Check the parts
for(int r=1;r<sheet.getPhysicalNumberOfRows();r++) {
    String partNumber = null;
    switch(cell.getCellType()) {
        case HSSFCell.CELL_TYPE_NUMERIC:
            long pNum = (long) cell.getNumericCellValue();
            partNumber = String.valueOf(pNum);
            break;
        case HSSFCell.CELL_TYPE_STRING:
            partNumber = cell.getStringCellValue();
            break;
        default:
            logger.info("Part Number at row " + r + " on sheet " + partList.getSheetName(s) + "is of an unsupported type");
    }

    try {
        List<String> oldMaterialNumbers = getOldMaterialNumbers(partNumber);

        boolean gotDrawing = checkPartNumber(oldMaterialNumbers, partNumber);
        //If there's a drawing then color the row green, if not red.
        short bgColorIndex = gotDrawing
                                ?HSSFColor.LIGHT_GREEN.index //42
                                :HSSFColor.RED.index; //10

        HSSFCell curCell = row.getCell(partNumberColumn);
        HSSFCellStyle curStyle = curCell.getCellStyle();

        curStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        curStyle.setFillForegroundColor(bgColorIndex);

        curCell.setCellStyle(curStyle);

    }catch(Exception e) {
        throw e;
    }
}

答案 1

简短版本：只创建一次样式，在任何地方使用它们。

长版本：使用方法创建所需的样式（请注意样式数量的限制）。

private static Map<String, CellStyle> styles;

private static Map<String, CellStyle> createStyles(Workbook wb){
        Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
        DataFormat df = wb.createDataFormat();

        CellStyle style;
        Font headerFont = wb.createFont();
        headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
        headerFont.setFontHeightInPoints((short) 12);
        style = createBorderedStyle(wb);
        style.setAlignment(CellStyle.ALIGN_CENTER);
        style.setFont(headerFont);
        styles.put("style1", style);

        style = createBorderedStyle(wb);
        style.setAlignment(CellStyle.ALIGN_CENTER);
        style.setFillForegroundColor(IndexedColors.LIGHT_CORNFLOWER_BLUE.getIndex());
        style.setFillPattern(CellStyle.SOLID_FOREGROUND);
        style.setFont(headerFont);
        style.setDataFormat(df.getFormat("d-mmm"));
        styles.put("date_style", style);
        ...
        return styles;
    }

您还可以使用方法在创建样式哈希映射时执行重复性任务

private static CellStyle createBorderedStyle(Workbook wb) {
        CellStyle style = wb.createCellStyle();
        style.setBorderRight(CellStyle.BORDER_THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex());
        style.setBorderBottom(CellStyle.BORDER_THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        style.setBorderLeft(CellStyle.BORDER_THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        style.setBorderTop(CellStyle.BORDER_THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        return style;
    }

然后，在“主”代码中，从您拥有的样式映射中设置样式。

Cell cell = xssfCurrentRow.createCell( intCellPosition );       
cell.setCellValue( blah );
cell.setCellStyle( (CellStyle) styles.get("style1") );

答案 2

要创建单元格样式，请参阅：http://poi.apache.org/spreadsheet/quick-guide.html#CustomColors。

自定义颜色

高铁：

HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
HSSFRow row = sheet.createRow((short) 0);
HSSFCell cell = row.createCell((short) 0);
cell.setCellValue("Default Palette");

//apply some colors from the standard palette,
// as in the previous examples.
//we'll use red text on a lime background

HSSFCellStyle style = wb.createCellStyle();
style.setFillForegroundColor(HSSFColor.LIME.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

HSSFFont font = wb.createFont();
font.setColor(HSSFColor.RED.index);
style.setFont(font);

cell.setCellStyle(style);

//save with the default palette
FileOutputStream out = new FileOutputStream("default_palette.xls");
wb.write(out);
out.close();

//now, let's replace RED and LIME in the palette
// with a more attractive combination
// (lovingly borrowed from freebsd.org)

cell.setCellValue("Modified Palette");

//creating a custom palette for the workbook
HSSFPalette palette = wb.getCustomPalette();

//replacing the standard red with freebsd.org red
palette.setColorAtIndex(HSSFColor.RED.index,
        (byte) 153,  //RGB red (0-255)
        (byte) 0,    //RGB green
        (byte) 0     //RGB blue
);
//replacing lime with freebsd.org gold
palette.setColorAtIndex(HSSFColor.LIME.index, (byte) 255, (byte) 204, (byte) 102);

//save with the modified palette
// note that wherever we have previously used RED or LIME, the
// new colors magically appear
out = new FileOutputStream("modified_palette.xls");
wb.write(out);
out.close();

XSSF：

 XSSFWorkbook wb = new XSSFWorkbook();
    XSSFSheet sheet = wb.createSheet();
    XSSFRow row = sheet.createRow(0);
    XSSFCell cell = row.createCell( 0);
    cell.setCellValue("custom XSSF colors");

    XSSFCellStyle style1 = wb.createCellStyle();
    style1.setFillForegroundColor(new XSSFColor(new java.awt.Color(128, 0, 128)));
    style1.setFillPattern(CellStyle.SOLID_FOREGROUND);