本文主要是介绍关于EasyExcel导入数据时表格日期格式识别为数字问题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
参考官方地址
自定义日期转字符串转换器
/*** 自定义excel日期转换器** @author li* @date 2024-05-29*/
public class CustomStringDateConverter implements Converter<String> {@Overridepublic Class<?> supportJavaTypeKey() {return String.class;}@Overridepublic CellDataTypeEnum supportExcelTypeKey() {return CellDataTypeEnum.STRING;}/*** 读调用*/@Overridepublic String convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) {Date date = null;//单元格格式为 文本类型if (CellDataTypeEnum.STRING.equals(cellData.getType())) {date = DateTimeUtil.parseMatched(cellData.getStringValue());if(date==null){throw new DmeoException("日期数据解析失败，请检查导入模板数据");}}//单元格格式为标准日期类型try {if (CellDataTypeEnum.NUMBER.equals(cellData.getType())) {if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {date = DateUtils.getJavaDate(cellData.getNumberValue().doubleValue(),globalConfiguration.getUse1904windowing());} else {date = DateUtils.getJavaDate(cellData.getNumberValue().doubleValue(),contentProperty.getDateTimeFormatProperty().getUse1904windowing());}}} catch (Exception e) {throw new DmeoException("日期数据解析失败，请检查导入模板数据");}return DateTimeUtil.format(date, FORMAT_SHORT);}/*** 写调用*/@Overridepublic WriteCellData<?> convertToExcelData(WriteConverterContext<String> context) {return new WriteCellData<>(context.getValue());}}
@ExcelProperty(value = "日期",converter = CustomStringDateConverter.class)
控制层异常捕获，需要使用 e.getCause().getMessage()才能取到自己抛出的异常信息
catch (ExcelDataConvertException e) {String msg = "第" + e.getRowIndex() + "行，第" + e.getColumnIndex() + "列"+e.getCause().getMessage()+"，" +"解析字符数据为:"+ e.getCellData().getStringValue();}
官方日期工具类
import java.math.BigDecimal;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Pattern;import com.alibaba.excel.util.BooleanUtils;
import com.alibaba.excel.util.MapUtils;
import org.apache.poi.ss.usermodel.DateUtil;
import org.springframework.util.StringUtils;/*** 官方日期工具类***/
public class DateUtils {/*** Is a cache of dates*/private static final ThreadLocal<Map<Short, Boolean>> DATE_THREAD_LOCAL =new ThreadLocal<>();/*** Is a cache of dates*/private static final ThreadLocal<Map<String, SimpleDateFormat>> DATE_FORMAT_THREAD_LOCAL =new ThreadLocal<>();/*** The following patterns are used in {@link #isADateFormat(Short, String)}*/private static final Pattern date_ptrn1 = Pattern.compile("^\\[\\$\\-.*?\\]");private static final Pattern date_ptrn2 = Pattern.compile("^\\[[a-zA-Z]+\\]");private static final Pattern date_ptrn3a = Pattern.compile("[yYmMdDhHsS]");// add "\u5e74 \u6708 \u65e5" for Chinese/Japanese date format:2017 \u5e74 2 \u6708 7 \u65e5private static final Pattern date_ptrn3b =Pattern.compile("^[\\[\\]yYmMdDhHsS\\-T/\u5e74\u6708\u65e5,. :\"\\\\]+0*[ampAMP/]*$");// elapsed time patterns: [h],[m] and [s]private static final Pattern date_ptrn4 = Pattern.compile("^\\[([hH]+|[mM]+|[sS]+)\\]");// for format which start with "[DBNum1]" or "[DBNum2]" or "[DBNum3]" could be a Chinese dateprivate static final Pattern date_ptrn5 = Pattern.compile("^\\[DBNum(1|2|3)\\]");// for format which start with "年" or "月" or "日" or "时" or "分" or "秒" could be a Chinese dateprivate static final Pattern date_ptrn6 = Pattern.compile("(年|月|日|时|分|秒)+");public static final String DATE_FORMAT_10 = "yyyy-MM-dd";public static final String DATE_FORMAT_14 = "yyyyMMddHHmmss";public static final String DATE_FORMAT_16 = "yyyy-MM-dd HH:mm";public static final String DATE_FORMAT_16_FORWARD_SLASH = "yyyy/MM/dd HH:mm";public static final String DATE_FORMAT_17 = "yyyyMMdd HH:mm:ss";public static final String DATE_FORMAT_19 = "yyyy-MM-dd HH:mm:ss";public static final String DATE_FORMAT_19_FORWARD_SLASH = "yyyy/MM/dd HH:mm:ss";private static final String MINUS = "-";public static String defaultDateFormat = DATE_FORMAT_19;public static String defaultLocalDateFormat = DATE_FORMAT_10;private DateUtils() {}/*** convert string to date** @param dateString* @param dateFormat* @return* @throws ParseException*/public static Date parseDate(String dateString, String dateFormat) throws ParseException {if (StringUtils.isEmpty(dateFormat)) {dateFormat = switchDateFormat(dateString);}return getCacheDateFormat(dateFormat).parse(dateString);}/*** convert string to date** @param dateString* @param dateFormat* @param local* @return*/public static LocalDateTime parseLocalDateTime(String dateString, String dateFormat, Locale local) {if (StringUtils.isEmpty(dateFormat)) {dateFormat = switchDateFormat(dateString);}if (local == null) {return LocalDateTime.parse(dateString, DateTimeFormatter.ofPattern(dateFormat));} else {return LocalDateTime.parse(dateString, DateTimeFormatter.ofPattern(dateFormat, local));}}/*** convert string to date** @param dateString* @param dateFormat* @param local* @return*/public static LocalDate parseLocalDate(String dateString, String dateFormat, Locale local) {if (StringUtils.isEmpty(dateFormat)) {dateFormat = switchDateFormat(dateString);}if (local == null) {return LocalDate.parse(dateString, DateTimeFormatter.ofPattern(dateFormat));} else {return LocalDate.parse(dateString, DateTimeFormatter.ofPattern(dateFormat, local));}}/*** convert string to date** @param dateString* @return* @throws ParseException*/public static Date parseDate(String dateString) throws ParseException {return parseDate(dateString, switchDateFormat(dateString));}/*** switch date format** @param dateString* @return*/public static String switchDateFormat(String dateString) {int length = dateString.length();switch (length) {case 19:if (dateString.contains(MINUS)) {return DATE_FORMAT_19;} else {return DATE_FORMAT_19_FORWARD_SLASH;}case 16:if (dateString.contains(MINUS)) {return DATE_FORMAT_16;} else {return DATE_FORMAT_16_FORWARD_SLASH;}case 17:return DATE_FORMAT_17;case 14:return DATE_FORMAT_14;case 10:return DATE_FORMAT_10;default:throw new IllegalArgumentException("can not find date format for：" + dateString);}}/*** Format date* <p>* yyyy-MM-dd HH:mm:ss** @param date* @return*/public static String format(Date date) {return format(date, null);}/*** Format date** @param date* @param dateFormat* @return*/public static String format(Date date, String dateFormat) {if (date == null) {return null;}if (StringUtils.isEmpty(dateFormat)) {dateFormat = defaultDateFormat;}return getCacheDateFormat(dateFormat).format(date);}/*** Format date** @param date* @param dateFormat* @return*/public static String format(LocalDateTime date, String dateFormat, Locale local) {if (date == null) {return null;}if (StringUtils.isEmpty(dateFormat)) {dateFormat = defaultDateFormat;}if (local == null) {return date.format(DateTimeFormatter.ofPattern(dateFormat));} else {return date.format(DateTimeFormatter.ofPattern(dateFormat, local));}}/*** Format date** @param date* @param dateFormat* @return*/public static String format(LocalDate date, String dateFormat) {return format(date, dateFormat, null);}/*** Format date** @param date* @param dateFormat* @return*/public static String format(LocalDate date, String dateFormat, Locale local) {if (date == null) {return null;}if (StringUtils.isEmpty(dateFormat)) {dateFormat = defaultLocalDateFormat;}if (local == null) {return date.format(DateTimeFormatter.ofPattern(dateFormat));} else {return date.format(DateTimeFormatter.ofPattern(dateFormat, local));}}/*** Format date** @param date* @param dateFormat* @return*/public static String format(LocalDateTime date, String dateFormat) {return format(date, dateFormat, null);}/*** Format date** @param date* @param dateFormat* @return*/public static String format(BigDecimal date, Boolean use1904windowing, String dateFormat) {if (date == null) {return null;}LocalDateTime localDateTime = DateUtil.getLocalDateTime(date.doubleValue(),BooleanUtils.isTrue(use1904windowing), true);return format(localDateTime, dateFormat);}private static DateFormat getCacheDateFormat(String dateFormat) {Map<String, SimpleDateFormat> dateFormatMap = DATE_FORMAT_THREAD_LOCAL.get();if (dateFormatMap == null) {dateFormatMap = new HashMap<String, SimpleDateFormat>();DATE_FORMAT_THREAD_LOCAL.set(dateFormatMap);} else {SimpleDateFormat dateFormatCached = dateFormatMap.get(dateFormat);if (dateFormatCached != null) {return dateFormatCached;}}SimpleDateFormat simpleDateFormat = new SimpleDateFormat(dateFormat);dateFormatMap.put(dateFormat, simpleDateFormat);return simpleDateFormat;}/*** Given an Excel date with either 1900 or 1904 date windowing,* converts it to a java.util.Date.** Excel Dates and Times are stored without any timezone* information. If you know (through other means) that your file* uses a different TimeZone to the system default, you can use* this version of the getJavaDate() method to handle it.** @param date The Excel date.* @param use1904windowing true if date uses 1904 windowing,* or false if using 1900 date windowing.* @return Java representation of the date, or null if date is not a valid Excel date*/public static Date getJavaDate(double date, boolean use1904windowing) {//To calculate the Date, in the use of `org.apache.poi.ss.usermodel.DateUtil.getJavaDate(double, boolean,// java.util.TimeZone, boolean), Date when similar `2023-01-01 00:00:00.500`, returns the`2023-01-01// 00:00:01`, but excel in fact shows the `2023-01-01 00:00:00`.// `org.apache.poi.ss.usermodel.DateUtil.getLocalDateTime(double, boolean, boolean)` There is no problem.return Date.from(getLocalDateTime(date, use1904windowing).atZone(ZoneId.systemDefault()).toInstant());}/*** Given an Excel date with either 1900 or 1904 date windowing,* converts it to a java.time.LocalDateTime.** Excel Dates and Times are stored without any timezone* information. If you know (through other means) that your file* uses a different TimeZone to the system default, you can use* this version of the getJavaDate() method to handle it.** @param date The Excel date.* @param use1904windowing true if date uses 1904 windowing,* or false if using 1900 date windowing.* @return Java representation of the date, or null if date is not a valid Excel date*/public static LocalDateTime getLocalDateTime(double date, boolean use1904windowing) {return DateUtil.getLocalDateTime(date, use1904windowing, true);}/*** Given an Excel date with either 1900 or 1904 date windowing,* converts it to a java.time.LocalDate.** Excel Dates and Times are stored without any timezone* information. If you know (through other means) that your file* uses a different TimeZone to the system default, you can use* this version of the getJavaDate() method to handle it.** @param date The Excel date.* @param use1904windowing true if date uses 1904 windowing,* or false if using 1900 date windowing.* @return Java representation of the date, or null if date is not a valid Excel date*/public static LocalDate getLocalDate(double date, boolean use1904windowing) {LocalDateTime localDateTime = getLocalDateTime(date, use1904windowing);return localDateTime == null ? null : localDateTime.toLocalDate();}/*** Determine if it is a date format.** @param formatIndex* @param formatString* @return*/public static boolean isADateFormat(Short formatIndex, String formatString) {if (formatIndex == null) {return false;}Map<Short, Boolean> isDateCache = DATE_THREAD_LOCAL.get();if (isDateCache == null) {isDateCache = MapUtils.newHashMap();DATE_THREAD_LOCAL.set(isDateCache);} else {Boolean isDatecachedDataList = isDateCache.get(formatIndex);if (isDatecachedDataList != null) {return isDatecachedDataList;}}boolean isDate = isADateFormatUncached(formatIndex, formatString);isDateCache.put(formatIndex, isDate);return isDate;}/*** Determine if it is a date format.** @param formatIndex* @param formatString* @return*/public static boolean isADateFormatUncached(Short formatIndex, String formatString) {// First up, is this an internal date format?if (isInternalDateFormat(formatIndex)) {return true;}if (StringUtils.isEmpty(formatString)) {return false;}String fs = formatString;final int length = fs.length();StringBuilder sb = new StringBuilder(length);for (int i = 0; i < length; i++) {char c = fs.charAt(i);if (i < length - 1) {char nc = fs.charAt(i + 1);if (c == '\\') {switch (nc) {case '-':case ',':case '.':case ' ':case '\\':// skip current '\' and continue to the next charcontinue;}} else if (c == ';' && nc == '@') {i++;// skip ";@" dupletscontinue;}}sb.append(c);}fs = sb.toString();// short-circuit if it indicates elapsed time: [h], [m] or [s]if (date_ptrn4.matcher(fs).matches()) {return true;}// If it starts with [DBNum1] or [DBNum2] or [DBNum3]// then it could be a Chinese datefs = date_ptrn5.matcher(fs).replaceAll("");// If it starts with [$-...], then could be a date, but// who knows what that starting bit is all aboutfs = date_ptrn1.matcher(fs).replaceAll("");// If it starts with something like [Black] or [Yellow],// then it could be a datefs = date_ptrn2.matcher(fs).replaceAll("");// You're allowed something like dd/mm/yy;[red]dd/mm/yy// which would place dates before 1900/1904 in red// For now, only consider the first onefinal int separatorIndex = fs.indexOf(';');if (0 < separatorIndex && separatorIndex < fs.length() - 1) {fs = fs.substring(0, separatorIndex);}// Ensure it has some date letters in it// (Avoids false positives on the rest of pattern 3)if (!date_ptrn3a.matcher(fs).find()) {return false;}// If we get here, check it's only made up, in any case, of:// y m d h s - \ / , . : [ ] T// optionally followed by AM/PMboolean result = date_ptrn3b.matcher(fs).matches();if (result) {return true;}result = date_ptrn6.matcher(fs).find();return result;}/*** Given a format ID this will check whether the format represents an internal excel date format or not.** @see #isADateFormat(Short, String)*/public static boolean isInternalDateFormat(short format) {switch (format) {// Internal Date Formats as described on page 427 in// Microsoft Excel Dev's Kit...// 14-22case 0x0e:case 0x0f:case 0x10:case 0x11:case 0x12:case 0x13:case 0x14:case 0x15:case 0x16:// 27-36case 0x1b:case 0x1c:case 0x1d:case 0x1e:case 0x1f:case 0x20:case 0x21:case 0x22:case 0x23:case 0x24:// 45-47case 0x2d:case 0x2e:case 0x2f:// 50-58case 0x32:case 0x33:case 0x34:case 0x35:case 0x36:case 0x37:case 0x38:case 0x39:case 0x3a:return true;}return false;}public static void removeThreadLocalCache() {DATE_THREAD_LOCAL.remove();DATE_FORMAT_THREAD_LOCAL.remove();}
}
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