easyexcel/src/main/java/com/alibaba/excel/converters/string/StringNumberConverter.java

package com.alibaba.excel.converters.string;

import org.apache.poi.hssf.usermodel.HSSFDateUtil;

import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.property.ExcelContentProperty;
import com.alibaba.excel.util.DateUtils;
import com.alibaba.excel.util.NumberUtils;

/**
 * String and number converter
 *
 * @author zhuangjiaju
 */
public class StringNumberConverter implements Converter<String> {

    @Override
    public Class supportJavaTypeKey() {
        return String.class;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return CellDataTypeEnum.NUMBER;
    }

    @Override
    public String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty) {
        // If there are "DateTimeFormat", read as date
        if (contentProperty != null && contentProperty.getDateTimeFormatProperty() != null) {
            return DateUtils.format(
                HSSFDateUtil.getJavaDate(cellData.getDoubleValue(),
                    contentProperty.getDateTimeFormatProperty().getUse1904windowing(), null),
                contentProperty.getDateTimeFormatProperty().getFormat());
        }
        // If there are "NumberFormat", read as number
        return NumberUtils.format(cellData.getDoubleValue(), contentProperty);
    }

    @Override
    public CellData convertToExcelData(String value, ExcelContentProperty contentProperty) {
        return new CellData(Double.valueOf(value));
    }
}