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*/@Overrideprotected 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);
)
