如何使用 java Apache POI 在 excel 中动态构建边界

Question

所以在我的 java class 中，我有以下代码。

int rowNum = 11;
        Row myRow = null;
        Cell myCell = null;
        for (Object obj : details) {
            Object[] objArr = (Object[]) obj;
            String header = "";
            String value = "";
if (objArr[0] != null) {
                header = objArr[0].toString();
                myRow = sheet.createRow((short) rowNum);
                myCell = myRow.createCell(1);
                myCell.setCellValue(header);
 }

if (objArr[1] != null) {
                value = objArr[1].toString();
                myCell = myRow.createCell(6);
                myCell.setCellValue(value);
                myCell.setCellStyle(style);
            }
    rowNum++;
        }

和边框

for (int i = 0; i < objArr.length; i++) {
            Cell columnHeaderCell = myRow.createCell(i);
            columnHeaderCell.setCellValue((Double) objArr[i]);
            columnHeaderCell.setCellStyle(columnHeaderStyle);

        }

问题是边框重叠在数据之上并且正在为所有单元格创建边框。我如何在 java 中动态创建 2 X 10*(x) table？

Answer 1

使用 Apache POI 可以如下设置边框。
查找以下示例，这可能对您有所帮助。

/* Create Workbook and Worksheet */
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Colored Cell Border");
HSSFCellStyle style = workbook.createCellStyle();

/* Set Borders thickness */            
style.setBorderLeft(HSSFCellStyle.BORDER_THICK);             
style.setBorderRight(HSSFCellStyle.BORDER_THICK);            
style.setBorderTop(HSSFCellStyle.BORDER_THICK);              
style.setBorderBottom(HSSFCellStyle.BORDER_THICK);

/* Get Color Index */
style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
style.setTopBorderColor(IndexedColors.BLACK.getIndex());
style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
style.setRightBorderColor(IndexedColors.BLACK.getIndex());

/* Add border color to a cell */
Row row = sheet.createRow(0);                
Cell cell = row.createCell(0);
cell.setCellValue("Different border colors for a Cell");                
cell.setCellStyle(my_style);

Answer 2

我通过执行以下操作实现了它。获取数据为 object。因此，对于空单元格，验证 object!=null.

我的代码：

int rowNum = 1;
Row myRow = null;
Row emptyRow = null;
Cell myCell = null;
Cell emptyCell =null;

for (Object obj : details) {
            Object[] objArr = (Object[]) obj;
            String header = "";
            String value = "";


            if(objArr[0]==null){
                emptyRow = sheet.createRow((short) rowNum);
                emptyCell = emptyRow.createCell(0);
                emptyCell.setCellValue("");
                emptyCell.setCellStyle(style);
            }

            if(objArr[1]==null){
                emptyCell = emptyRow.createCell(1);
                emptyCell.setCellValue(value);
                emptyCell.setCellStyle(style);
            }

用于动态构建带有边框的行：

建筑物Header列：

if (objArr[0] != null) {
                header = objArr[0].toString();

                myRow = sheet.createRow((short) rowNum);
                myCell = myRow.createCell(0);



                for (int i = 0; i < 2; i++) {
                    Cell columnHeaderCell = myRow.createCell(i);
                    columnHeaderCell.setCellValue("");
                    columnHeaderCell.setCellStyle(style);   
                }
    }

用于构建值列：

    if (objArr[1] != null) {
                value = objArr[1].toString();
                myCell = myRow.createCell(1);
                myCell.setCellValue(value);
                myCell.setCellStyle(style);
            }

            rowNum++;
        }

上面的括号是为了结束for each循环。

边框

   HSSFCellStyle style=wb.createCellStyle();
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);

如何使用 java Apache POI 在 excel 中动态构建边界

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