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feat：添加自适应列宽处理器并替换默认列宽策略

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YunaiV
2025-07-26 20:08:04 +08:00
parent 1b412546eb
commit 77193102a2
4 changed files with 87 additions and 9 deletions
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78
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/handler/ColumnWidthMatchStyleStrategy.java Normal file
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@@ -0,0 +1,78 @@
package cn.iocoder.yudao.framework.excel.core.handler;
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;
/**
* 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);
@Override
protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell,
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));
Integer columnWidth = dataLength(cellDataList, cell, isHead);
if (columnWidth < 0) {
return;
}
if (columnWidth > MAX_COLUMN_WIDTH) {
columnWidth = MAX_COLUMN_WIDTH;
}
Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
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;
}
WriteCellData<?> cellData = cellDataList.get(0);
CellDataTypeEnum type = cellData.getType();
if (type == null) {
return -1;
}
switch (type) {
case STRING:
return cellData.getStringValue().getBytes().length;
case BOOLEAN:
return cellData.getBooleanValue().toString().getBytes().length;
case NUMBER:
return cellData.getNumberValue().toString().getBytes().length;
case DATE:
return cellData.getDateValue().toString().getBytes().length;
default:
return -1;
}
}
}

2
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/handler/SelectSheetWriteHandler.java
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@@ -86,7 +86,7 @@ public class SelectSheetWriteHandler implements SheetWriteHandler {
/**
* 判断字段是否是静态的、最终的、 transient 的
* 原因：EasyExcel 默认是忽略 static final 或 transient 的字段，所以需要判断
* 原因：FastExcel 默认是忽略 static final 或 transient 的字段，所以需要判断
*
* @param field 字段
* @return 是否是静态的、最终的、transient 的

14
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/core/util/ExcelUtils.java
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@@ -1,10 +1,10 @@
package cn.iocoder.yudao.framework.excel.core.util;
import cn.iocoder.yudao.framework.common.util.http.HttpUtils;
import cn.iocoder.yudao.framework.excel.core.handler.SelectSheetWriteHandler;
import cn.idev.excel.EasyExcel;
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;
@@ -32,9 +32,9 @@ public class ExcelUtils {
public static <T> void write(HttpServletResponse response, String filename, String sheetName,
Class<T> head, List<T> data) throws IOException {
// 输出 Excel
EasyExcel.write(response.getOutputStream(), head)
FastExcelFactory.write(response.getOutputStream(), head)
.autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
.registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
.registerWriteHandler(new ColumnWidthMatchStyleStrategy()) // 基于 column 长度，自动适配。最大 255 宽度
.registerWriteHandler(new SelectSheetWriteHandler(head)) // 基于固定 sheet 实现下拉框
.registerConverter(new LongStringConverter()) // 避免 Long 类型丢失精度
.sheet(sheetName).doWrite(data);
@@ -44,7 +44,7 @@ public class ExcelUtils {
}
public static <T> List<T> read(MultipartFile file, Class<T> head) throws IOException {
return EasyExcel.read(file.getInputStream(), head, null)
return FastExcelFactory.read(file.getInputStream(), head, null)
.autoCloseStream(false) // 不要自动关闭，交给 Servlet 自己处理
.doReadAllSync();
}

2
yudao-framework/yudao-spring-boot-starter-excel/src/main/java/cn/iocoder/yudao/framework/excel/package-info.java
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@@ -1,4 +1,4 @@
/**
* 基于 EasyExcel 实现 Excel 相关的操作
* 基于 FastExcel 实现 Excel 相关的操作
*/
package cn.iocoder.yudao.framework.excel;