如何通过java用poi生成多选下拉框的excel
时间: 2024-03-03 22:47:08 浏览: 54
可以通过以下步骤使用Java的POI库生成多选下拉框的Excel:
1. 创建一个工作簿对象,并创建一个工作表对象
```
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
```
2. 创建一个下拉列表选项集合,并添加选项
```
DataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
String[] options = {"Option 1", "Option 2", "Option 3", "Option 4", "Option 5"};
List<String> optionList = Arrays.asList(options);
DataValidationConstraint dvConstraint = dvHelper.createExplicitListConstraint(optionList.toArray(new String[0]));
```
3. 创建一个单元格对象,并设置单元格的下拉列表数据有效性校验
```
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0); // 第一行第一列
DataValidation validation = dvHelper.createValidation(dvConstraint, addressList);
validation.setShowErrorBox(true);
sheet.addValidationData(validation);
```
4. 将工作簿对象写入到一个文件中
```
FileOutputStream outputStream = new FileOutputStream("output.xlsx");
workbook.write(outputStream);
outputStream.close();
```
完整代码示例:
```
import java.io.FileOutputStream;
import java.util.Arrays;
import java.util.List;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.XSSFDataValidationHelper;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class MultipleSelectionDropdown {
public static void main(String[] args) throws Exception {
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
DataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
String[] options = {"Option 1", "Option 2", "Option 3", "Option 4", "Option 5"};
List<String> optionList = Arrays.asList(options);
DataValidationConstraint dvConstraint = dvHelper.createExplicitListConstraint(optionList.toArray(new String[0]));
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0); // 第一行第一列
DataValidation validation = dvHelper.createValidation(dvConstraint, addressList);
validation.setShowErrorBox(true);
sheet.addValidationData(validation);
FileOutputStream outputStream = new FileOutputStream("output.xlsx");
workbook.write(outputStream);
outputStream.close();
}
}
```