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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.poi.excel.cell.setters;

import cn.hutool.core.util.StrUtil;
import cn.hutool.poi.excel.cell.CellSetter;
import org.apache.poi.ss.usermodel.Cell;

/**
 * {@link Number} 值单元格设置器
 *
 * @author looly
 * @since 5.7.8
 */
public class NullCellSetter implements CellSetter {

	public static final NullCellSetter INSTANCE = new NullCellSetter();

	@Override
	public void setValue(Cell cell) {
		cell.setCellValue(StrUtil.EMPTY);
	}
}