McBasicCmtySheetWriteHandler.java
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package com.chinagas.modules.schsf.utils.listener;
import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import java.util.List;
import java.util.Map;
public class McBasicCmtySheetWriteHandler implements SheetWriteHandler {
private Map<Integer, List<String>> selectDataMap;
public McBasicCmtySheetWriteHandler(Map<Integer, List<String>> selectDataMap) {
this.selectDataMap = selectDataMap;
}
@Override
public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
int globalIndex = 1;
// 获取第一个sheet页
Sheet sheet = writeSheetHolder.getCachedSheet();
// 获取sheet页的数据校验对象
DataValidationHelper helper = sheet.getDataValidationHelper();
// 获取工作簿对象,用于创建存放下拉数据的字典sheet数据页
Workbook workbook = writeWorkbookHolder.getWorkbook();
for (Map.Entry<Integer, List<String>> entry : selectDataMap.entrySet()) {
// 设置存放下拉数据的字典sheet,并把这些sheet隐藏掉,这样用户交互更友好
String dictSheetName = "dict_hide_sheet" + globalIndex;
Sheet dictSheet = workbook.createSheet(dictSheetName);
// 隐藏字典sheet页
workbook.setSheetHidden(globalIndex, true);
// 创建一个名为“dictSheetName”的名称,指向字典表中的数据区域
String refers = dictSheetName + "!$A$1:$A$" + (entry.getValue().size() + 1);
Name name = workbook.createName();
name.setNameName(dictSheetName);
name.setRefersToFormula(refers);
// 向字典sheet写数据,从第一行开始写
for (int i = 0; i < entry.getValue().size(); i++) {
Row row = dictSheet.createRow(i);
Cell cell = row.createCell(0);
cell.setCellValue(entry.getValue().get(i));
}
// 设置下拉列表覆盖的行数,从第一行开始到最后一行
CellRangeAddressList infoList = new CellRangeAddressList(1, Short.MAX_VALUE, entry.getKey(), entry.getKey());
// 创建下拉列表约束
DataValidationConstraint constraint = helper.createFormulaListConstraint(dictSheetName);
DataValidation dataValidation = helper.createValidation(constraint, infoList);
sheet.addValidationData(dataValidation);
globalIndex++;
}
}
}