POI （Apache POI）生成Excel合并单元格并添加底色

本文链接： https://blog.csdn.net/qq_41076931/article/details/102572388

上个礼拜五做了这个小项目，完了，生成Excel的效果非常不好，今天忙活了一天，还是重新添加了一些方法，才得以成功运行出来相对完美的效果。具体效果看下面讲解。

一、创建工作簿和工作表

HSSFWorkbook workbook = new HSSFWorkbook(); // 创建工作簿对象
HSSFSheet sheet = workbook.createSheet("数据库表"); // 创建工作表

二、循环遍历数据库中的数据

CellStyle style = setStyle(workbook);
CellStyle style2 = setCellStyle_1(workbook);

dao.queryTables().forEach(item -> {

			// 设置字段的格式
			row++;// 插入表信息空行

			HSSFRow rowm = sheet.createRow(row);
			CellRangeAddress region = new CellRangeAddress(row, row, 1, 2);
			sheet.addMergedRegion(region);
			CellRangeAddress region2 = new CellRangeAddress(row, row, 4, 5);
			sheet.addMergedRegion(region2);

			HSSFCell cell = null;

			cell = rowm.createCell(0);
			cell.setCellValue("表名");
			cell.setCellStyle(style2);

			cell = rowm.createCell(1);
			cell.setCellValue(item.getTable_name());
			cell.setCellStyle(style);

			cell = rowm.createCell(2);
			cell.setCellStyle(style);

			cell = rowm.createCell(3);
			cell.setCellValue("描述");
			cell.setCellStyle(style2);

			cell = rowm.createCell(4);
			cell.setCellValue(item.getTable_comment());
			cell.setCellStyle(style);

			cell = rowm.createCell(5);
			cell.setCellStyle(style);

			row++;// 表头
			rowm = sheet.createRow(row);
			String titles[] = new String[] { "字段名", "字段描述", "数据类型", "可为空", "是主键", "规则" };
			for (int i = 0; i < titles.length; i++) {
				rowm.createCell(i).setCellValue(titles[i]);
				rowm.getCell(i).setCellStyle(style2);
			}

			dao.queryFields(item.getTable_name()).forEach(ite -> {
				row++;// 字段
				//log.info(ite.toString());
				// 遍历数据并放入字段
				HSSFRow rowf = sheet.createRow(row);
				String content[] = new String[] { ite.getColumn_name(), ite.getColumn_comment(), ite.getColumn_type(),
													ite.getIs_nullable(), ite.getPri(), "无" };
				for (int j = 0; j < content.length; j++) {
					rowf.createCell(j).setCellValue(content[j]);
					rowf.getCell(j).setCellStyle(style);
				}
			});
			row++;
		});

三、设置单元格的格式

private CellStyle setStyle(HSSFWorkbook workbook) {
		CellStyle style = workbook.createCellStyle();
		style.setBorderBottom(BorderStyle.THIN); // 下边框
		style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderLeft(BorderStyle.THIN);// 左边框
		style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderTop(BorderStyle.THIN);// 上边框
		style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderRight(BorderStyle.THIN);// 右边框
		style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		return style;
	}

	private CellStyle setCellStyle_1(HSSFWorkbook workbook) {
		CellStyle style = setStyle(workbook);
		style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());// 增加颜色
		style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
		return style;
	}

四、遍历之后并写入文件

dao.queryFields(item.getTable_name()).forEach(ite -> {
				row++;// 字段
				//log.info(ite.toString());
				// 遍历数据并放入字段
				HSSFRow rowf = sheet.createRow(row);
				String content[] = new String[] { ite.getColumn_name(), ite.getColumn_comment(), ite.getColumn_type(),
													ite.getIs_nullable(), ite.getPri(), "无" };
				for (int j = 0; j < content.length; j++) {
					rowf.createCell(j).setCellValue(content[j]);
					rowf.getCell(j).setCellStyle(style);
				}
			});
			row++;
		});
		File file = getTime();
		workbook.write(file);
		workbook.close();
		
		tool.copyFile(file);
	}

六、具体的项目其他逻辑层还需要近一步的整理。谢谢。

POI （Apache POI）生成Excel合并单元格并添加底色

猜你喜欢