JAVA org.apache.poi,导出excel的时候监听单元格下拉框的内容,去把对应数据自动填充下一个单元格
时间: 2024-03-18 09:39:37 浏览: 113
使用 Apache POI 导出 Excel 并监听单元格下拉框的内容,可以通过以下步骤实现:
1. 创建一个工作簿和工作表:
```
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
```
2. 创建一个下拉列表并设置下拉列表的选项:
```
String[] options = {"Option1", "Option2", "Option3"};
DataValidationHelper validationHelper = new XSSFDataValidationHelper(sheet);
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0);
DataValidationConstraint constraint = validationHelper.createExplicitListConstraint(options);
DataValidation dataValidation = validationHelper.createValidation(constraint, addressList);
sheet.addValidationData(dataValidation);
```
3. 监听单元格内容变化的事件:
```
sheet.addChangeListener(new SheetChangeListener() {
@Override
public void sheetChanged(SheetChangeEvent event) {
// 获取发生变化的单元格
Cell cell = event.getCell();
// 判断单元格是否为下拉列表的单元格
if (cell.getCellType() == CellType.STRING && cell.getAddress().getColumn() == 0 && cell.getAddress().getRow() == 0) {
// 获取下拉列表选中的值
String selectedOption = cell.getStringCellValue();
// 在下一个单元格中填充对应的数据
Row row = sheet.getRow(0);
Cell nextCell = row.getCell(1);
if (nextCell == null) {
nextCell = row.createCell(1);
}
nextCell.setCellValue(getDataForOption(selectedOption));
}
}
});
```
在这个监听事件中,我们首先判断单元格是否为下拉列表的单元格,如果是,则获取下拉列表选中的值,并在下一个单元格中填充对应的数据。
需要注意的是,此处的 `SheetChangeListener` 是自定义的监听器,需要实现 `SheetChangeListener` 接口并重写 `sheetChanged` 方法。另外,`getDataForOption` 方法是根据选中的下拉列表值获取对应的数据的自定义方法。
完整的代码示例如下:
```
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
String[] options = {"Option1", "Option2", "Option3"};
DataValidationHelper validationHelper = new XSSFDataValidationHelper(sheet);
CellRangeAddressList addressList = new CellRangeAddressList(0, 0, 0, 0);
DataValidationConstraint constraint = validationHelper.createExplicitListConstraint(options);
DataValidation dataValidation = validationHelper.createValidation(constraint, addressList);
sheet.addValidationData(dataValidation);
sheet.addChangeListener(new SheetChangeListener() {
@Override
public void sheetChanged(SheetChangeEvent event) {
Cell cell = event.getCell();
if (cell.getCellType() == CellType.STRING && cell.getAddress().getColumn() == 0 && cell.getAddress().getRow() == 0) {
String selectedOption = cell.getStringCellValue();
Row row = sheet.getRow(0);
Cell nextCell = row.getCell(1);
if (nextCell == null) {
nextCell = row.createCell(1);
}
nextCell.setCellValue(getDataForOption(selectedOption));
}
}
});
private String getDataForOption(String option) {
// 根据选中的下拉列表值获取对应的数据
// ...
return "Data for " + option;
}
```
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