JAVA Apache POI Excel：为单元格区域添加边框

Question

有没有办法在Java POI中使用Java为cellrange添加边框？

像A1：B2应该得到一个左上角 - 右下角的厚边框式？

我知道如何创建和应用单个单元格的样式，我可能会迭代通过单元格并应用适当的样式，但我相信有一个更简单的方法。

Answer 1

我已经弄清楚了。在apache poi页面上实际上有一个示例，我只是找不到我一直在搜索的关键字。

CellRangeAddress region = CellRangeAddress.valueOf(A1:B2);
short borderStyle = CellStyle.BORDER_MEDIUM;
RegionUtil.setBorderBottom(borderStyle, region, activeSheet, excelWorkbook);
RegionUtil.setBorderTop(borderStyle, region, activeSheet, excelWorkbook);
RegionUtil.setBorderLeft(borderStyle, region, activeSheet, excelWorkbook);
RegionUtil.setBorderRight(borderStyle, region, activeSheet, excelWorkbook);

Answer 2

事情在3.16发生了变化

CellRangeAddress region = new CellRangeAddress(6, 8, 1, 10);
RegionUtil.setBorderBottom(BorderStyle.THIN, region, sheet);
RegionUtil.setBorderTop(BorderStyle.THIN, region, sheet);
RegionUtil.setBorderLeft(BorderStyle.THIN, region, sheet);
RegionUtil.setBorderRight(BorderStyle.THIN, region, sheet);

Answer 3

在我的情况下，RegionUtil将除了白色以外的所有背景颜色都变为黑色。这是我的解决方法：

public final class BorderUtils {

    public static void setBorder(Sheet sheet, BorderStyle borderStyle, CellRangeAddress region) {
        setBorderTop(sheet, borderStyle, region);
        setBorderBottom(sheet, borderStyle, region);
        setBorderLeft(sheet, borderStyle, region);
        setBorderRight(sheet, borderStyle, region);
    }

    public static void setBorderTop(Sheet sheet, BorderStyle borderStyle, CellRangeAddress region) {
        Row row = sheet.getRow(region.getFirstRow());
        for (int i=region.getFirstColumn() ; i<=region.getLastColumn() ; i++) {
            Cell cell = row.getCell(i);
            CellStyle cellStyle = cloneCellStyle(sheet, cell);
            cellStyle.setBorderTop(borderStyle);
            cell.setCellStyle(cellStyle);
        }
    }

    public static void setBorderBottom(Sheet sheet, BorderStyle borderStyle, CellRangeAddress region) {
        Row row = sheet.getRow(region.getLastRow());
        for (int i=region.getFirstColumn() ; i<=region.getLastColumn() ; i++) {
            Cell cell = row.getCell(i);
            CellStyle cellStyle = cloneCellStyle(sheet, cell);
            cellStyle.setBorderBottom(borderStyle);
            cell.setCellStyle(cellStyle);
        }
    }

    public static void setBorderLeft(Sheet sheet, BorderStyle borderStyle, CellRangeAddress region) {
        for (int i=region.getFirstRow() ; i<=region.getLastRow() ; i++) {
            Cell cell = sheet.getRow(i).getCell(region.getFirstColumn());
            CellStyle cellStyle = cloneCellStyle(sheet, cell);
            cellStyle.setBorderLeft(borderStyle);
            cell.setCellStyle(cellStyle);
        }
    }

    public static void setBorderRight(Sheet sheet, BorderStyle borderStyle, CellRangeAddress region) {
        for (int i=region.getFirstRow() ; i<=region.getLastRow() ; i++) {
            Cell cell = sheet.getRow(i).getCell(region.getLastColumn());
            CellStyle cellStyle = cloneCellStyle(sheet, cell);
            cellStyle.setBorderRight(borderStyle);
            cell.setCellStyle(cellStyle);
        }
    }

}