easyExcel时间格式转换器

定义转换器

package com.haier.hibp.stock.util;

import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.converters.WriteConverterContext;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.GlobalConfiguration;
import com.alibaba.excel.metadata.data.ReadCellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.metadata.property.ExcelContentProperty;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * LocalDateTime 时间格式转换器
 */
public final class LocalDateTimeConverter implements Converter<LocalDateTime> {
    private static final String DEFAULT_FORMAT = "yyyy-MM-dd HH:mm:ss";

    @Override
    public Class<LocalDateTime> supportJavaTypeKey() {
        return LocalDateTime.class;
    }

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

    @Override
    public LocalDateTime convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
        return LocalDateTime.parse(cellData.getStringValue(), DateTimeFormatter.ofPattern(getFormat(contentProperty)));
    }

    @Override
    public WriteCellData<?> convertToExcelData(WriteConverterContext<LocalDateTime> context) throws Exception {
        LocalDateTime value = context.getValue();
        ExcelContentProperty contentProperty = context.getContentProperty();
        return new WriteCellData<>(value.format(DateTimeFormatter.ofPattern(getFormat(contentProperty))));
    }

    private String getFormat(ExcelContentProperty contentProperty) {
        if (contentProperty == null) {
            return DEFAULT_FORMAT;
        }
        if (contentProperty.getDateTimeFormatProperty() == null) {
            return DEFAULT_FORMAT;
        }
        return contentProperty.getDateTimeFormatProperty().getFormat();
    }
}

使用转换器

ExcelWriter excelWriter = EasyExcelFactory.write(httpServletResponse.getOutputStream())
        .build();
WriteSheet writeSheet = EasyExcelFactory.writerSheet(1, sheetName).head(clazz)
        .registerConverter(new LongStringConverter())
        .registerConverter(new LocalDateTimeConverter())
        .registerWriteHandler(new AutoColumnWidthStrategy()).build();
excelWriter.write(data, writeSheet);