easyexcel版本2.1.4

问题现象：

使用自动列宽LongestMatchColumnWidthStyleStrategy时，除了第一次调用接口，列宽自动，后面几次调用列宽未设置

问题原因：

CACHE被static标识，是类共享的，所以除了第一次有变化，后面的列宽都不会变化。

解决方法：

自己实现一个类似的拦截器，参考代码

package com.centerm.mrrs.handler;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;

import org.apache.poi.ss.usermodel.Cell;

import com.alibaba.excel.enums.CellDataTypeEnum;

import com.alibaba.excel.metadata.CellData;

import com.alibaba.excel.metadata.Head;

import com.alibaba.excel.util.CollectionUtils;

import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;

/**

* Take the width of the longest column as the width.

*

* This is not very useful at the moment, for example if you have Numbers it will cause a newline.And the length is not

* exactly the same as the actual length.

*

* @author Jiaju Zhuang

*/

public class ColumnWidthStyleStrategy extends AbstractColumnWidthStyleStrategy {

private static final int MAX_COLUMN_WIDTH = 255;

private final Map> CACHE = new HashMap>(8);

@Override

protected void setColumnWidth(WriteSheetHolder writeSheetHolder, ListcellDataList, Cell cell, Head head,

Integer relativeRowIndex, Boolean isHead) {

boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);

if (!needSetWidth) {

return;

}

MapmaxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());

if (maxColumnWidthMap == null) {

maxColumnWidthMap = new HashMap(16);

CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);

}

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);

}

}

private Integer dataLength(ListcellDataList, Cell cell, Boolean isHead) {

if (isHead) {

return cell.getStringCellValue().getBytes().length;

}

CellData 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;

default:

return -1;

}

}

}