vue下载excel以及自适应表格宽度（前后端）

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
</dependency>

axios
    .get(`/api/audit/export`, {
      responseType: "blob" //服务器响应的数据类型，可以是 'arraybuffer', 'blob', 'document', 'json', 'text', 'stream'，默认是'json'
    })
    .then((res) => {
      if (!res) return;
      const blob = new Blob([res.data], { type: "application/vnd.ms-excel" }); // 构造一个blob对象来处理数据，并设置文件类型

      if (window.navigator.msSaveOrOpenBlob) {
        //兼容IE10
        navigator.msSaveBlob(blob, this.filename);
      } else {
        const href = URL.createObjectURL(blob); //创建新的URL表示指定的blob对象
        const a = document.createElement("a"); //创建a标签
        a.style.display = "none";
        a.href = href; // 指定下载链接
        a.download = "test.xlsx"; //指定下载文件名
        a.click(); //触发下载
        URL.revokeObjectURL(a.href); //释放URL对象
      }
      // 这里也可以不创建a链接，直接window.open(href)也能下载
    })
    .catch((err) => {
      console.log(err);
    });

axios
.get(`后端接口链接`, {
  responseType: "blob" //返回的数据类型
})
.then((res) => {
  fileDownload(res.data, "test111.xlsx");
});

formData.value.pageNum = 1;
formData.value.pageSize = 200;

axios
.post(`后端接口链接`, formData.value, {
  responseType: "blob" //返回的数据类型
})
.then((res) => {
  fileDownload(res.data, "test111.xlsx");
});

fileName = URLEncoder.encode("中文excel文件名称", "UTF-8").replaceAll("\\+", "%20");

let dis = res.headers["content-disposition"];
let filename = decodeURIComponent(dis.split("attachment;filename*=")[1]);

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;
import com.qunar.base.meerkat.util.DateUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * easyExcel 自适应列宽
 *
 */
@Slf4j
public class ExcelWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {

    private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
    
    // 适当增加宽度，能避免 数字显示为 * 的问题
    public static final int DEFAULT = 2;

    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);
            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<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
        if (isHead) {
            return cell.getStringCellValue().getBytes().length + DEFAULT;
        } 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 + DEFAULT;
                    case BOOLEAN:
                        return cellData.getBooleanValue().toString().getBytes().length + DEFAULT;
                    case NUMBER:
                        return cellData.getNumberValue().toString().getBytes().length + DEFAULT;
                    case DATE:
                        return DateUtil.PATTERN_YYYY_MM_DD_HH_MM_SS.getBytes().length + DEFAULT;
                    default:
                        return -1;
                }
            }
        }
    }
}

EasyExcel.write(response.getOutputStream(), DownloadData.class).registerWriteHandler(new ExcelWidthStyleStrategy()).sheet("模板").doWrite(downloadDataList);