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feat：添加自适应列宽处理器并替换默认列宽策略

pull/201/head
YunaiV 2025-07-26 20:09:05 +08:00
parent 3efadfebe5
commit 321e1f5ba1
2 changed files with 24 additions and 18 deletions
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41
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/handler/ColumnWidthMatchStyleStrategy.java
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@ -1,38 +1,42 @@
package cn.iocoder.yudao.framework.excel.core.handler;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.util.MapUtils;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.commons.collections4.CollectionUtils;
import cn.hutool.core.collection.CollUtil;
import cn.idev.excel.enums.CellDataTypeEnum;
import cn.idev.excel.metadata.Head;
import cn.idev.excel.metadata.data.WriteCellData;
import cn.idev.excel.util.MapUtils;
import cn.idev.excel.write.metadata.holder.WriteSheetHolder;
import cn.idev.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import cn.idev.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 自适应列宽处理器
* Excel 自适应列宽处理器
*
* 相比 {@link LongestMatchColumnWidthStyleStrategy} 来说，额外处理了 DATE 类型！
*
* @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>
* @author hmb
*/
public class ColumnWidthMatchStyleStrategy extends AbstractColumnWidthStyleStrategy {
private static final int MAX_COLUMN_WIDTH = 255;
private final Map<Integer, Map<Integer, Integer>> cache = MapUtils.newHashMapWithExpectedSize(8);
public ColumnWidthMatchStyleStrategy() {
}
private static final int MAX_COLUMN_WIDTH = 255;
private final Map<Integer, Map<Integer, Integer>> cache = MapUtils.newHashMapWithExpectedSize(8);
@Override
protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell,
Head head,
Integer relativeRowIndex, Boolean isHead) {
boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
Head head, Integer relativeRowIndex, Boolean isHead) {
boolean needSetWidth = isHead || CollUtil.isNotEmpty(cellDataList);
if (!needSetWidth) {
return;
}
Map<Integer, Integer> maxColumnWidthMap = cache.computeIfAbsent(writeSheetHolder.getSheetNo(), key -> new HashMap<>(16));
Map<Integer, Integer> maxColumnWidthMap = cache.computeIfAbsent(writeSheetHolder.getSheetNo(),
key -> new HashMap<>(16));
Integer columnWidth = dataLength(cellDataList, cell, isHead);
if (columnWidth < 0) {
return;
@ -43,10 +47,11 @@ public class ColumnWidthMatchStyleStrategy extends AbstractColumnWidthStyleStrat
Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), (columnWidth+3) * 256);
writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
}
}
@SuppressWarnings("EnhancedSwitchMigration")
private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
if (isHead) {
return cell.getStringCellValue().getBytes().length;
@ -69,5 +74,5 @@ public class ColumnWidthMatchStyleStrategy extends AbstractColumnWidthStyleStrat
return -1;
}
}
}
}

1
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/util/ExcelUtils.java
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@ -4,6 +4,7 @@ import cn.idev.excel.FastExcelFactory;
import cn.idev.excel.converters.longconverter.LongStringConverter;
import cn.idev.excel.write.style.column.LongestMatchColumnWidthStyleStrategy;
import cn.iocoder.yudao.framework.common.util.http.HttpUtils;
import cn.iocoder.yudao.framework.excel.core.handler.ColumnWidthMatchStyleStrategy;
import cn.iocoder.yudao.framework.excel.core.handler.SelectSheetWriteHandler;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.web.multipart.MultipartFile;