EasyExcel表头宽度根据数据内容自适应+自动换行

我的版本EasyExcel为3.x,如果使用2.x可能有些字段不一样

表头宽度根据数据内容自适应

配置类

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.springframework.util.CollectionUtils;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 表头宽度根据数据内容自适应
 */
public class CustomWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {

    private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();

    /**
     * 设置列宽
     *
     * @param writeSheetHolder
     * @param cellDataList
     * @param cell
     * @param head
     * @param relativeRowIndex
     * @param isHead
     */
    @Override
    protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
        if (needSetWidth) {
            Map<Integer, Integer> maxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());
            if (maxColumnWidthMap == null) {
                maxColumnWidthMap = new HashMap<>();
                CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);
            }

            Integer columnWidth = this.dataLength(cellDataList, cell, isHead)/2;
            if (columnWidth >= 0) {
                if (columnWidth > 255) {
                    columnWidth = 255;
                }
                Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
                if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
                    maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
                    writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
                }
            }
        }
    }

    /**
     * 数据长度
     *
     * @param cellDataList
     * @param cell
     * @param isHead
     * @return
     */
    private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
        //头直接返回原始长度
        if (isHead) {
            return cell.getStringCellValue().getBytes().length;
        } else {
            //不是头的话  看是什么类型  用数字加就可以了
            WriteCellData cellData = cellDataList.get(0);
            CellDataTypeEnum type = cellData.getType();
            if (type == null) {
                return -1;
            } else {
                switch (type) {
                    case STRING:
                        return cellData.getStringValue().getBytes().length + 1;
                    case BOOLEAN:
                        return cellData.getBooleanValue().toString().getBytes().length;
                    case NUMBER:
                        return cellData.getNumberValue().toString().getBytes().length * 2;
                    default:
                        return -1;
                }
            }
        }
    }
}

使用EasyExcel写入到excel里面

        EasyExcel.write(byteArrayOutputStream, DatasetRefreshHistoryVo.class)
                .sheet("模板")
                .registerWriteHandler(new CustomWidthStyleStrategy())
                .doWrite(list);

自动换行

配置

    /**
     * 单元格样式策略
     */
    public static HorizontalCellStyleStrategy getHorizontalCellStyleStrategy() {
        // 内容的策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 设置边框
        contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);
        contentWriteCellStyle.setBorderLeft(BorderStyle.THIN);
        contentWriteCellStyle.setBorderRight(BorderStyle.THIN);
        contentWriteCellStyle.setBorderTop(BorderStyle.NONE);

        // 配置字体
        WriteFont contentWriteFont = new WriteFont();
        // 字体
//        contentWriteFont.setFontName("宋体");
        // 字体大小
//        contentWriteFont.setFontHeightInPoints(fontHeightInPoints);
        // 设置加粗
        contentWriteFont.setBold(false);
        contentWriteCellStyle.setWriteFont(contentWriteFont);

        // 【水平居中需要使用以下两行】
        // 设置文字左右居中
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 设置文字上下居中
        contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        // 设置 自动换行
        contentWriteCellStyle.setWrapped(true);
        contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
        contentWriteCellStyle.setFillForegroundColor(IndexedColors.PINK.getIndex());

        // 样式策略
        return new HorizontalCellStyleStrategy(null, contentWriteCellStyle);
    }

使用EasyExcel写入到excel里面
可以同时使用两个registerWriteHandler

        EasyExcel.write(byteArrayOutputStream, DatasetRefreshHistoryVo.class)
                .sheet("模板")
                .registerWriteHandler(this.getHorizontalCellStyleStrategy())
                .registerWriteHandler(new CustomWidthStyleStrategy())
                .doWrite(list);