public void exportToExcel(List<Node> nodeList, OutputStream outputStream) { Workbook workbook = new XSSFWorkbook(); Sheet sheet = workbook.createSheet("Tree Data"); // 创建表头 Row headerRow = sheet.createRow(0); headerRow.createCell(0).setCellValue("ID"); headerRow.createCell(1).setCellValue("Name"); headerRow.createCell(2).setCellValue("Parent ID"); // 创建数据行 int rowIndex = 1; for (Node node : nodeList) { Row row = sheet.createRow(rowIndex++); row.createCell(0).setCellValue(node.getId()); row.createCell(1).setCellValue(node.getName()); row.createCell(2).setCellValue(node.getParentId()); } // 合并父级相同的行 Map<String, CellRangeAddress> mergedRegions = new HashMap<>(); for (int i = 1; i < rowIndex; i++) { Row row = sheet.getRow(i); String parentId = row.getCell(2).getStringCellValue(); if (mergedRegions.containsKey(parentId)) { CellRangeAddress mergedRegion = mergedRegions.get(parentId); int lastRow = mergedRegion.getLastRow(); mergedRegions.put(parentId, new CellRangeAddress(lastRow, lastRow + 1, 2, 2)); } else { mergedRegions.put(parentId, new CellRangeAddress(i, i, 2, 2)); } } for (CellRangeAddress mergedRegion : mergedRegions.values()) { sheet.addMergedRegion(mergedRegion); } // 输出Excel try { workbook.write(outputStream); } catch (IOException e) { e.printStackTrace(); }} 这个代码报这个错 Exception in thread "main" java.lang.IllegalArgumentException: Merged region C2 must contain 2 or more cells at org.apache.poi.xssf.usermodel.XSSFSheet.addMergedRegion(XSSFSheet.java:403) at org.apache.poi.xssf.usermodel.XSSFSheet.addMergedRegion(XSSFSheet.java:368) at com.cd.test.Test1.exportToExcel(Test1.java:80) at com.cd.test.Test1.main(Test1.java:40)

public void exportToExcel(List<Node> nodeList, OutputStream outputStream) { Workbook workbook = new XSSFWorkbook(); Sheet sheet = workbook.createSheet("Tree Data"); // 创建表头 Row headerRow = sheet.createRow(0); headerRow.createCell(0).setCellValue("ID"); headerRow.createCell(1).setCellValue("Name"); headerRow.createCell(2).setCellValue("Parent ID"); // 创建数据行 int rowIndex = 1; for (Node node : nodeList) { Row row = sheet.createRow(rowIndex++); row.createCell(0).setCellValue(node.getId()); row.createCell(1).setCellValue(node.getName()); row.createCell(2).setCellValue(node.getParentId()); } // 合并父级相同的行 Map<String, CellRangeAddress> mergedRegions = new HashMap<>(); for (int i = 1; i < rowIndex; i++) { Row row = sheet.getRow(i); String parentId = row.getCell(2).getStringCellValue(); if (mergedRegions.containsKey(parentId)) { CellRangeAddress mergedRegion = mergedRegions.get(parentId); int lastRow = mergedRegion.getLastRow(); mergedRegions.put(parentId, new CellRangeAddress(lastRow, lastRow + 1, 2, 2)); } else { mergedRegions.put(parentId, new CellRangeAddress(i, i, 2, 2)); } } for (CellRangeAddress mergedRegion : mergedRegions.values()) { sheet.addMergedRegion(mergedRegion); } // 输出Excel try { workbook.write(outputStream); } catch (IOException e) { e.printStackTrace(); }} 这个代码参数要怎么传

这个方法的第一个参数是一个 List<Node> 类型的 nodeList，用于传递要导出到 Excel 中的数据。第二个参数是一个 OutputStream 类型的 outputStream，用于指定要将 Excel 数据写入的目标输出流。你可以按照以下方式...

public static void main(String[] args) throws FileNotFoundException { ArrayList<Node> nodes = new ArrayList<Node>(); Node node0 = new Node(0, "1", null); Node node1 = new Node(1, "2", "0"); Node node2 = new Node(2, "3", "1"); Node node3 = new Node(3, "4", "1"); Node node4 = new Node(4, "5", "2"); Node node5 = new Node(5, "6", "2"); Node node6 = new Node(6, "7", "0"); nodes.add(node0); nodes.add(node1); nodes.add(node2); nodes.add(node3); nodes.add(node4); nodes.add(node5); nodes.add(node6); OutputStream outputStream = new FileOutputStream("D:\javaTools\project\TestProject-dd\tree_data.xlsx"); exportToExcel(nodes, outputStream); } public static void exportToExcel(List<Node> nodeList, OutputStream outputStream) { Workbook workbook = new XSSFWorkbook(); Sheet sheet = workbook.createSheet("Tree Data"); // 创建表头 Row headerRow = sheet.createRow(0); headerRow.createCell(0).setCellValue("ID"); headerRow.createCell(1).setCellValue("Name"); headerRow.createCell(2).setCellValue("Parent ID"); // 创建数据行 int rowIndex = 1; for (Node node : nodeList) { Row row = sheet.createRow(rowIndex++); row.createCell(0).setCellValue(node.getId()); row.createCell(1).setCellValue(node.getName()); row.createCell(2).setCellValue(node.getParentId()); } // 合并父级相同的行 Map<String, CellRangeAddress> mergedRegions = new HashMap<>(); for (int i = 1; i < rowIndex; i++) { Row row = sheet.getRow(i); String parentId = row.getCell(2).getStringCellValue(); if (mergedRegions.containsKey(parentId)) { CellRangeAddress mergedRegion = mergedRegions.get(parentId); int lastRow = mergedRegion.getLastRow(); if (lastRow == i - 1) { mergedRegions.put(parentId, new CellRangeAddress(lastRow, i, 2, 2)); } else { mergedRegions.put(parentId, new CellRangeAddress(lastRow + 1, i, 2, 2)); } } else { mergedRegions.put(parentId, new CellRangeAddress(i, i, 2, 2)); } } for (CellRangeAddress mergedRegion : mergedRegions.values()) { sheet.addMergedRegion(mergedRegion); } // 输出Excel try { workbook.write(outputStream); } catch (IOException e) { e.printStackTrace(); } } 这段代码有什么问题

1. 在导出到Excel中时，将所有数据都写入同一个Sheet中，如果数据量很大，可能会导致Excel文件过大或者导出失败。应该考虑将数据分成多个Sheet导出。 2. 在合并父级相同的行时，使用了HashMap来存储合并的区域，...

public static void exportToExcel(List<Node> nodeList, OutputStream outputStream, int pageSize) { Workbook workbook = new XSSFWorkbook(); int totalSize = nodeList.size(); int totalPage = (totalSize % pageSize == 0) ? (totalSize / pageSize) : (totalSize / pageSize + 1); // 二维数组 merged 用于记录每个单元格的合并情况 boolean[][] merged = new boolean[totalSize][3]; for (int i = 0; i < totalPage; i++) { Sheet sheet = workbook.createSheet("Tree Data - Page " + (i + 1)); // 创建表头 Row headerRow = sheet.createRow(0); headerRow.createCell(0).setCellValue("ID"); headerRow.createCell(1).setCellValue("Name"); headerRow.createCell(2).setCellValue("Parent ID"); // 计算当前页起始位置和结束位置 int startIndex = i * pageSize; int endIndex = Math.min((i + 1) * pageSize, totalSize); // 创建数据行 int rowIndex = 1; for (int j = startIndex; j < endIndex; j++) { Node node = nodeList.get(j); Row row = sheet.createRow(rowIndex++); row.createCell(0).setCellValue(node.getId()); row.createCell(1).setCellValue(node.getName()); row.createCell(2).setCellValue(node.getParentId()); // 判断是否需要合并单元格 if (j > 0) { for (int k = 0; k < 3; k++) { if (nodeList.get(j - 1).getValueByIndex(k).equals(node.getValueByIndex(k)) && !merged[j - 1][k]) { CellRangeAddress mergedRegion = new CellRangeAddress(j - 1 + 1, j + 1, k, k); sheet.addMergedRegion(mergedRegion); merged[j - 1][k] = true; merged[j][k] = true; } } } } } // 输出Excel try { workbook.write(outputStream); outputStream.flush(); outputStream.close(); } catch (IOException e) { e.printStackTrace(); } }这段代码参数怎么传给个示例

假设你有一个名为 nodeList 的 List<Node>，每页显示 10 条数据，你想将数据导出到名为 tree_data.xlsx 的 Excel 文件中，可以这样调用该方法： try { OutputStream outputStream = new ...

@RequestMapping(value = "export", method = RequestMethod.GET) public void exportToExcel(HttpServletRequest request, HttpServletResponse response, HttpSession session) throws IOException { System.out.println("111"); List<Attendance> attendanceList = (List<Attendance>) session.getAttribute("list"); // 创建 Excel 文档 Workbook workbook = new XSSFWorkbook(); Sheet sheet = workbook.createSheet("Attendance"); // 创建表头 Row headerRow = sheet.createRow(0); String[] headers = {"考勤ID", "用户ID", "用户名", "考勤时间", "考勤类型"}; for (int i = 0; i < headers.length; i++) { Cell cell = headerRow.createCell(i); cell.setCellValue(headers[i]); } // 填充数据 int rowIndex = 1; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); for (Attendance attendance : attendanceList) { Row dataRow = sheet.createRow(rowIndex); dataRow.createCell(0).setCellValue(attendance.getAttendanceid()); dataRow.createCell(1).setCellValue(attendance.getUserid()); dataRow.createCell(2).setCellValue(attendance.getUsername()); dataRow.createCell(3).setCellValue(sdf.format(attendance.getDate())); dataRow.createCell(4).setCellValue(attendance.getType()); rowIndex++; } // 设置响应头 response.setHeader("content-type", "application/octet-stream"); response.setContentType("application/force-download"); response.addHeader("Content-Disposition", "attachment; filename=attendance.xlsx"); // 将 Excel 数据写入响应输出流 OutputStream outputStream = response.getOutputStream(); workbook.write(outputStream); workbook.close(); outputStream.flush(); outputStream.close(); }

在方法体中，首先输出 "111"，然后从 HttpSession 中获取名为 "list" 的属性，该属性的类型为 List<Attendance>。接下来，通过 Apache POI 库创建了一个名为 workbook 的 XSSFWorkbook 对象，然后创建了名为 ...

java poi写一个Excel导出，导出对象类型是List peopleList有5个属性, People对象中有两个属性为List<Son> sonList，List<dog> dogList。导出的Excel表头为peopleList中三个普通字段和List<Son>、List<dog>为一级表头，sonList、dogList中的属性为List<Son> sonList、List<dog> dogList下的二级表头，

public static void exportToExcel(List<People> peopleList, OutputStream outputStream) throws IOException { // 创建一个新的工作簿 Workbook workbook = new XSSFWorkbook(); // 创建一个新的工作表 Sheet ...

<input type="text" oninput="filterTable(1)" placeholder="aoiStep" > <input type="text" oninput="filterTable(2)" placeholder="defectType" > <input type="text" oninput="filterTable(3)" placeholder="layerCode" > <input type="text" oninput="filterTable(4)" placeholder="type"> <input type="text" oninput="filterTable(5)" placeholder="dpet" > <input type="text" oninput="filterTable(6)" placeholder="subcode" > <input type="text" placeholder="codeDescription" >在导出时，这几个表头内容没有导出

<button onclick="exportToExcel()">导出为Excel</button>  <table id="myTable"> <tr> <th contenteditable="true"><input type="text" oninput="filterTable(1)" placeholder="aoiStep" ></th...

运行报错The argument type 'List<int>?' can't be assigned to the parameter type 'List<int>'.dart

Future<void> exportToExcel(List<List<dynamic>> data) async { // 获取应用文档目录 final directory = await getApplicationDocumentsDirectory(); final path = directory.path; // 创建一个新的Excel文档 ...

若依的java架构导出excel，对象属性为list<map>怎么办

public void exportToExcel(List<Map<String, Object>> dataList, String filePath) throws IOException { // 创建工作簿对象 Workbook workbook = new XSSFWorkbook(); // 创建工作表对象 Sheet sheet = ...

<button class="button" onclick="addRow()">新增一行</button> <button class="button" onclick="deleteRow()">删除行</button> <button class="button" onclick="navigateToUserManagement()">用户管理</button> <button class="button" onclick="exportToExcel()">导出</button> <button onclick="submitData(this)">提交</button> <button onclick="deleteImageInSelectedCell()">删除图片</button> <input type="file" onchange="previewImage(this)" onclick="selectCell(this)" onclick="showPopup(this.src)" style="width: 100px; height: auto;"> let selectedCell; function selectCell(cell) { selectedCell = cell; } function deleteImageInSelectedCell() { if (selectedCell) { const imageContainer = selectedCell.querySelector('.image-container'); if (imageContainer) { imageContainer.innerHTML = ''; } } }修改后我选中已经添加图片的单元格后，图片并没有被删除

<button class="button" onclick="exportToExcel()">导出</button> <button onclick="submitData(this)">提交</button> <button onclick="deleteImageInSelectedCell()">删除图片</button> </div> </div> <td> ...

<button class="button" onclick="addRow()">新增一行</button> <button class="button" onclick="deleteRow()">删除行</button> <button class="button" onclick="navigateToUserManagement()">用户管理</button> <button class="button" onclick="exportToExcel()">导出</button> 以上为我的其他按钮代码

- 第四个按钮通过 onclick="exportToExcel()" 绑定了一个叫做 exportToExcel 的函数。点击该按钮时，将执行 exportToExcel() 函数。这些函数的具体实现需要根据你的需求来编写。例如，addRow() 可以用于...

public class FileViewModel { public MemoryStream FileStream { get; set; } public string ContentType { get; set; } public string FileName { get; set; } } public ActionResult ExportToExcel() { var package = new ExcelPackage();//是一个epplus中的类 var worksheet = package.Workbook.Worksheets.Add("Sheet1");//Workbook 是 Excel 工作簿，Worksheets 是工作簿中的工作表集合 // 添加表头 cell代表表格或单元格 worksheet.Cells[1, 1].Value = "姓名"; worksheet.Cells[1, 2].Value = "年龄"; worksheet.Cells[1, 3].Value = "性别"; // 添加数据 worksheet.Cells[2, 1].Value = "张三"; worksheet.Cells[2, 2].Value = 20; worksheet.Cells[2, 3].Value = "男"; worksheet.Cells[3, 1].Value = "李四"; worksheet.Cells[3, 2].Value = 25; worksheet.Cells[3, 3].Value = "女"; // 自适应列宽 worksheet.Cells.AutoFitColumns(); // 导出 Excel 文件 var fileStream = new MemoryStream(package.GetAsByteArray()); var fileName = "export.xlsx"; var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; return View(new FileViewModel { FileStream = fileStream, ContentType = contentType, FileName = fileName }); }视图里面改、该如何写

<a href="@Url.Action("ExportToExcel")">Download Excel</a> </body> </html> 在这个视图中，我们使用了 @model 指令来指定视图的模型类型为 FileViewModel。然后，我们使用 Razor 语法来输出文件流，如下所示： ...

public ActionResult ExportToExcel() { var package = new ExcelPackage();//是一个epplus中的类 var worksheet = package.Workbook.Worksheets.Add("Sheet1");//Workbook 是 Excel 工作簿，Worksheets 是工作簿中的工作表集合 // 添加表头 cell代表表格或单元格 worksheet.Cells[1, 1].Value = "姓名"; worksheet.Cells[1, 2].Value = "年龄"; worksheet.Cells[1, 3].Value = "性别"; // 添加数据 worksheet.Cells[2, 1].Value = "张三"; worksheet.Cells[2, 2].Value = 20; worksheet.Cells[2, 3].Value = "男"; worksheet.Cells[3, 1].Value = "李四"; worksheet.Cells[3, 2].Value = 25; worksheet.Cells[3, 3].Value = "女"; // 自适应列宽 worksheet.Cells.AutoFitColumns(); // 导出 Excel 文件 var fileStream = new MemoryStream(package.GetAsByteArray()); var fileName = "export.xlsx"; var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; return View(new FileViewModel { FileStream = fileStream, ContentType = contentType, FileName = fileName }); }@model该怎么写

var worksheet = package.Workbook.Worksheets.Add("Sheet1"); worksheet.Cells[1, 1].Value = "姓名"; worksheet.Cells[1, 2].Value = "年龄"; worksheet.Cells[1, 3].Value = "性别"; worksheet.Cells[2, 1...

public ActionResult ExportToExcel() { var package = new ExcelPackage(); var worksheet = package.Workbook.Worksheets.Add("Sheet1"); // 添加表头 worksheet.Cells[1, 1].Value = "姓名"; worksheet.Cells[1, 2].Value = "年龄"; worksheet.Cells[1, 3].Value = "性别"; // 添加数据 worksheet.Cells[2, 1].Value = "张三"; worksheet.Cells[2, 2].Value = 20; worksheet.Cells[2, 3].Value = "男"; worksheet.Cells[3, 1].Value = "李四"; worksheet.Cells[3, 2].Value = 25; worksheet.Cells[3, 3].Value = "女"; // 自适应列宽 worksheet.Cells.AutoFitColumns(); // 导出 Excel 文件 var fileStream = new MemoryStream(package.GetAsByteArray()); var fileName = "export.xlsx"; var contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; return File(fileStream, contentType, fileName); }接下来该如何操作

这是一个 ASP.NET MVC 控制器中导出 Excel 文件的示例代码。你可以将这段代码复制到你的项目中，并根据需要进行修改。如果你想要在浏览器中下载导出的 Excel 文件，可以将该控制器方法作为一个 Action 方法，并在 ...

public class ExportToExcelController : Controller { // GET: ExportToExcel public ActionResult ExportToExcel() { //存储在数据表对象中 DataTable dt = new DataTable(); // 创建对象 ExcelPackage excelPackage = new ExcelPackage(); // 将表添加到对象 ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet1"); //填充数据 //worksheet.Cells["A1"].LoadFromDataTable(dt, true); // 转换字节组 byte[] fileContents = excelPackage.GetAsByteArray(); // 返回 return File(fileContents, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "filename.xlsx"); }如何添加数据

可以使用以下代码将数据添加到 DataTable 中： dt.Columns.Add("列名1"); dt.Columns.Add("列名2"); dt.Rows.Add("数据1", "数据2"); 其中，"列名1"和"列名2"是列的名称，"数据1"和"数据2"是要添加的数据。...

jsp导出excel并支持分sheet导出的方法

public DownloadFile exportToExcel() throws Exception{ String config_value = systemConfigService.getConfigValueByKey(Export.Xls); logger.info(获取的导出类型为execl表格+,每页sheet导出的行数为:+config_...

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