zoukankan      html  css  js  c++  java
  • easyexcel自适应列宽

    在导出时注册registerWriteHandler(new CustomCellWriteHandler())

    /**
     * @author jamin
     * @date 2020/7/29 11:28
     * 设置自适应列宽
     */
    public class CustomCellWriteHandler extends AbstractColumnWidthStyleStrategy {
        private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
    
        @Override
        protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<CellData> cellDataList, Cell cell, Head head, Integer integer, 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);
                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);
                    }
    
                }
            }
        }
    
        private Integer dataLength(List<CellData> cellDataList, Cell cell, Boolean isHead) {
            if (isHead) {
                return cell.getStringCellValue().getBytes().length;
            } else {
                CellData cellData = cellDataList.get(0);
                CellDataTypeEnum type = cellData.getType();
                if (type == null) {
                    return -1;
                } else {
                    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;
                        default:
                            return -1;
                    }
                }
            }
        }
    }
    
    作者: JaminYe
    版权声明:本文原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。
  • 相关阅读:
    作业要求 20201022-1 每周例行报告
    作业要求 20201015-3 每周例行报告
    20201008-1 每周例行报告
    20200924-1 每周例行报告
    总结
    20201126-1 每周例行报告
    20201120-1 每周例行报告
    20201112-1 每周例行报告
    20201105-1 每周例行报告
    20201029-1 每周例行报告
  • 原文地址:https://www.cnblogs.com/JaminYe/p/13401455.html
Copyright © 2011-2022 走看看