Java 创建多级表头 Excel 文件：事件管理系统示例

以下是一个示例代码，用于创建具有多级表头的 Excel 文件，用于事件管理系统。\n\njava\nimport java.io.FileOutputStream;\nimport org.apache.poi.ss.usermodel.*;\nimport org.apache.poi.xssf.usermodel.XSSFWorkbook;\n\npublic class ExcelCreator {\n\n public static void main(String[] args) {\n try {\n // 创建工作簿\n Workbook workbook = new XSSFWorkbook();\n // 创建工作表\n Sheet sheet = workbook.createSheet("事件列表");\n\n // 创建表头行\n Row headerRow = sheet.createRow(0);\n\n // 设置表头单元格样式\n CellStyle headerCellStyle = workbook.createCellStyle();\n headerCellStyle.setAlignment(HorizontalAlignment.CENTER);\n headerCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);\n headerCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());\n headerCellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);\n\n // 设置表头单元格字体样式\n Font headerFont = workbook.createFont();\n headerFont.setBold(true);\n headerCellStyle.setFont(headerFont);\n\n // 创建表头单元格并设置值\n Cell eventNumberCell = headerRow.createCell(0);\n eventNumberCell.setCellValue("事件编号");\n eventNumberCell.setCellStyle(headerCellStyle);\n\n Cell themeCell = headerRow.createCell(1);\n themeCell.setCellValue("主题");\n themeCell.setCellStyle(headerCellStyle);\n\n Cell eventTypeCell = headerRow.createCell(2);\n eventTypeCell.setCellValue("事件类型");\n eventTypeCell.setCellStyle(headerCellStyle);\n\n Cell reporterCell = headerRow.createCell(3);\n reporterCell.setCellValue("上报人");\n reporterCell.setCellStyle(headerCellStyle);\n\n Cell contactCell = headerRow.createCell(4);\n contactCell.setCellValue("联系电话");\n contactCell.setCellStyle(headerCellStyle);\n\n Cell statusCell = headerRow.createCell(5);\n statusCell.setCellValue("事件状态");\n statusCell.setCellStyle(headerCellStyle);\n\n Cell reportTimeCell = headerRow.createCell(6);\n reportTimeCell.setCellValue("上报时间");\n reportTimeCell.setCellStyle(headerCellStyle);\n\n // 合并单元格（受理、处理、审核、评价、归档、完结）\n sheet.addMergedRegion(new CellRangeAddress(0, 0, 7, 18));\n\n // 创建多级表头行\n Row subHeaderRow = sheet.createRow(1);\n\n // 设置多级表头单元格样式\n CellStyle subHeaderCellStyle = workbook.createCellStyle();\n subHeaderCellStyle.setAlignment(HorizontalAlignment.CENTER);\n subHeaderCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);\n subHeaderCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());\n subHeaderCellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);\n\n // 设置多级表头单元格字体样式\n Font subHeaderFont = workbook.createFont();\n subHeaderFont.setBold(true);\n subHeaderCellStyle.setFont(subHeaderFont);\n\n // 创建多级表头单元格并设置值\n Cell acceptPersonCell = subHeaderRow.createCell(7);\n acceptPersonCell.setCellValue("受理人员");\n acceptPersonCell.setCellStyle(subHeaderCellStyle);\n\n Cell acceptDeptCell = subHeaderRow.createCell(8);\n acceptDeptCell.setCellValue("受理部门");\n acceptDeptCell.setCellStyle(subHeaderCellStyle);\n\n Cell acceptTimeCell = subHeaderRow.createCell(9);\n acceptTimeCell.setCellValue("受理时间");\n acceptTimeCell.setCellStyle(subHeaderCellStyle);\n\n // 创建文件输出流\n FileOutputStream fileOut = new FileOutputStream("event_list.xlsx");\n // 将工作簿写入文件\n workbook.write(fileOut);\n // 关闭文件输出流\n fileOut.close();\n // 关闭工作簿\n workbook.close();\n\n System.out.println("Excel文件创建成功！");\n } catch (Exception e) {\n e.printStackTrace();\n } \n }\n}\n\n\n该代码使用Apache POI库来创建Excel文件。在代码中，我们创建了一个多级表头，将受理、处理、审核、评价、归档和完结合并为一个单元格，并设置了单元格样式和字体样式。然后，我们将工作簿写入文件并关闭相关资源。\n\n请注意，您需要在项目中添加Apache POI库的依赖项，以便代码能够编译和运行。\n