package cn.iocoder.yudao.framework.excel.core.handler;
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import cn.hutool.core.collection.CollUtil;
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import cn.idev.excel.enums.CellDataTypeEnum;
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import cn.idev.excel.metadata.Head;
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import cn.idev.excel.metadata.data.WriteCellData;
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import cn.idev.excel.util.MapUtils;
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import cn.idev.excel.write.metadata.holder.WriteSheetHolder;
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import cn.idev.excel.write.style.column.AbstractColumnWidthStyleStrategy;
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import cn.idev.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
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import org.apache.poi.ss.usermodel.Cell;
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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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* Excel 自适应列宽处理器
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*
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* 相比 {@link LongestMatchColumnWidthStyleStrategy} 来说，额外处理了 DATE 类型！
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*
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* @see <a href="https://github.com/YunaiV/yudao-cloud/pull/196/">添加自适应列宽处理器，并替换默认列宽策略</a>
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* @author hmb
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*/
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public class ColumnWidthMatchStyleStrategy extends AbstractColumnWidthStyleStrategy {
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private static final int MAX_COLUMN_WIDTH = 255;
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private final Map<Integer, Map<Integer, Integer>> cache = MapUtils.newHashMapWithExpectedSize(8);
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@Override
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protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell,
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Head head, Integer relativeRowIndex, Boolean isHead) {
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boolean needSetWidth = isHead || CollUtil.isNotEmpty(cellDataList);
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if (!needSetWidth) {
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return;
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}
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Map<Integer, Integer> maxColumnWidthMap = cache.computeIfAbsent(writeSheetHolder.getSheetNo(),
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key -> new HashMap<>(16));
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Integer columnWidth = dataLength(cellDataList, cell, isHead);
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if (columnWidth < 0) {
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return;
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}
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// 字段上声明了 @ColumnWidth 时，以声明值为下限。
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// 否则注解值会被本策略覆盖：EasyExcel 自己的 AbstractHeadColumnWidthStyleStrategy（负责把
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// @ColumnWidth 写进列宽）与本策略 order 相同（都是 0，按注册顺序排在前面），
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// 本策略按内容长度后写，直接把声明的宽度冲掉 —— 例如「2026-10-13 10:10:20」只有 19 个字符，
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// 列宽就停在 19，声明再大也没用。取最大值后，注解成了内容长度的下限，只放宽不收窄。
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if (isHead && head != null && head.getColumnWidthProperty() != null) {
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columnWidth = Math.max(columnWidth, head.getColumnWidthProperty().getWidth());
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}
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if (columnWidth > MAX_COLUMN_WIDTH) {
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columnWidth = MAX_COLUMN_WIDTH;
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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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writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
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}
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}
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@SuppressWarnings("EnhancedSwitchMigration")
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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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}
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WriteCellData<?> 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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}
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switch (type) {
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case STRING:
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return cellData.getStringValue().getBytes().length;
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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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case DATE:
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return cellData.getDateValue().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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