Java 使用DataValidationHelper(POI)的Excel下拉列表
我正在使用包含一百万行的SXSSFWorkbook(流)生成一个excel文件(.xlsx)。一列必须包含一个具有4-5个值的下拉列表。我能够生成这个,但我有两个问题-Java 使用DataValidationHelper(POI)的Excel下拉列表,java,excel,apache-poi,Java,Excel,Apache Poi,我正在使用包含一百万行的SXSSFWorkbook(流)生成一个excel文件(.xlsx)。一列必须包含一个具有4-5个值的下拉列表。我能够生成这个,但我有两个问题- 生成excel需要花费大量时间。7分钟有下拉菜单,11秒无下拉菜单,可播放250000行 文件生成后无法打开,因为它要求恢复最终将失败的数据。消息说“在文件D:\Test.xlsx中检测到错误已删除功能:数据验证来自/xl/worksheets/sheet2.xml部分” 下面是代码片段 DataValidationHelper
DataValidationHelper validationHelper = sh.getDataValidationHelper();
CellRangeAddressList addressList = new CellRangeAddressList(0, sh.getLastRowNum(), cellnum, cellnum);
DataValidationConstraint constraint = validationHelper.createExplicitListConstraint(new String[] { "High risk", "Medium risk", "Low risk", "No risk" });
DataValidation dataValidation = validationHelper.createValidation(constraint, addressList);
dataValidation.setSuppressDropDownArrow(true);
sh.addValidationData(dataValidation);
请向我推荐更好的解决方案。有一个简单的解决方案。在excel中创建隐藏(或受密码保护)工作表,并在下拉菜单中显示所需的数据。然后在dataValidationConstraint标记中引用该表。下载不会花费太多时间。PFB示例代码
main(){
new_workbook = new XSSFWorkbook();
hiddenRiskSheet= new_workbook.createSheet("RiskHidden");
createRiskHiddenSheet(hiddenPrepaidSheet);
hiddenRiskSheet.protectSheet("passw0rd");
hiddenRiskSheet.enableLocking();
DataValidationHelper validationHelper = null;
CellRangeAddressList addressList = new CellRangeAddressList(0, sh.getLastRowNum(), cellnum, cellnum);
DataValidationConstraint constraint = validationHelper..createFormulaListConstraint("RiskHidden!$A$1:$A$4");
DataValidation dataValidation = validationHelper.createValidation(constraint, addressList);
dataValidation.setSuppressDropDownArrow(true);
validationHelper.addValidationData(dataValidation);
}
public void createRiskHiddenSheet(XSSFSheet hiddenRiskSheet)
{
String[] risk = { "High risk", "Medium risk", "Low risk", "No risk" };
for (int i = 0; i < 4; i++) {
Row row = hiddenRiskSheet.createRow(i);
Cell cell = row.createCell(i);
String cat = risk[i];
cell.setCellValue(cat);
}
}
}
main(){
新建工作簿=新建XSSFWorkbook();
hiddenRiskSheet=新建工作簿.createSheet(“RiskHidden”);
createRiskHiddenSheet(hiddenPrepaidSheet);
hiddenRiskSheet.protectSheet(“passw0rd”);
hiddenRiskSheet.enableLocking();
DataValidationHelper validationHelper=null;
CellRangeAddressList addressList=新的CellRangeAddressList(0,sh.getLastRowNum(),cellnum,cellnum);
DataValidationConstraint=validationHelper..createFormulaListConstraint(“风险隐藏!$A$1:$A$4”);
DataValidation DataValidation=validationHelper.createValidation(约束,地址列表);
dataValidation.setSuppressDropDownArrow(真);
addValidationData(dataValidation);
}
公共作废createRiskHiddenSheet(XSSFSheet HiddenSheet)
{
字符串[]风险={“高风险”、“中风险”、“低风险”、“无风险”};
对于(int i=0;i<4;i++){
Row Row=hiddenRiskSheet.createRow(i);
Cell Cell=行createCell(i);
字符串cat=风险[i];
cell.setCellValue(cat);
}
}
}
createRiskHiddenSheet应修改-创建单元格时的一部分。它应该是:row.createCell(0.setValue(风险[i]);