package com.mes.utils.excel;
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import com.alibaba.excel.enums.CellDataTypeEnum;
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import com.alibaba.excel.metadata.Head;
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import com.alibaba.excel.metadata.data.CellData;
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import com.alibaba.excel.metadata.data.WriteCellData;
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import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
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import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
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import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
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import org.apache.poi.ss.usermodel.Cell;
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import org.apache.poi.ss.usermodel.Sheet;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* @Author : zhoush
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* @Date: 2025/5/12 20:34
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* @Description:
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*/
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public class CustomCellWriteWidthConfig extends AbstractColumnWidthStyleStrategy {
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private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
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@Override
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protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer integer, Boolean isHead) {
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boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
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if (needSetWidth) {
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Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());
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Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
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if (columnWidth > 0) {
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if (columnWidth > 10) {
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columnWidth = 20;
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} else {
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columnWidth = 10;
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}
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Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
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if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
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maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
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Sheet sheet = writeSheetHolder.getSheet();
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sheet.setColumnWidth(cell.getColumnIndex(), 256 * columnWidth + 184);
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}
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}
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}
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}
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/**
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* 计算长度
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*
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* @param cellDataList
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* @param cell
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* @param isHead
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* @return
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*/
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private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
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if (isHead) {
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return cell.getStringCellValue().getBytes().length;
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} else {
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CellData<?> cellData = cellDataList.get(0);
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CellDataTypeEnum type = cellData.getType();
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if (type == null) {
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return -1;
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} else {
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switch (type) {
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case STRING:
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// 换行符（数据需要提前解析好）
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int index = cellData.getStringValue().indexOf("\n");
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return index != -1 ?
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cellData.getStringValue().substring(0, index).getBytes().length + 1 : cellData.getStringValue().getBytes().length + 1;
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case BOOLEAN:
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return cellData.getBooleanValue().toString().getBytes().length;
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case NUMBER:
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return cellData.getNumberValue().toString().getBytes().length;
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default:
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return -1;
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}
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}
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}
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}
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}
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