Easypoi map方式导入数据，List＜Map＜String, String＞＞日期项数据为空（null）解决办法

前言

在使用easypoi map的方式解析excel文件，若文件中的某列数据格式是日期类型，那么它这个工具是读取不到，因为它的源码读取到某列为日期格式，数据必须为字符串类型，它才会处理

switch (cell.getCellType()) {case STRING:result = cell.getRichStringCellValue() == null ? "": cell.getRichStringCellValue().getString();break;case NUMERIC:if (DateUtil.isCellDateFormatted(cell)) {if ("class java.lang.String".equals(classFullName)) {result = formateDate(entity, cell.getDateCellValue());}} else {result = readNumericCell(cell);}break;case BOOLEAN:result = Boolean.toString(cell.getBooleanCellValue());break;case BLANK:break;case ERROR:break;case FORMULA:try {result = readNumericCell(cell);} catch (Exception e1) {try {result = cell.getRichStringCellValue() == null ? "": cell.getRichStringCellValue().getString();} catch (Exception e2) {throw new RuntimeException("获取公式类型的单元格失败", e2);}}break;default:break;}

解决办法

来个简单粗暴的，既然源码无法满足，那就直接扩展它的源码，在它 case NUMERIC 下加个任意类型都可以进去的判断方法，在项目main java包路径下定义一个跟源码一样的路径，一样的类，若那位大佬有更好的办法，还望留言指导一下呢

if("class java.lang.Object".equals(classFullName)){SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");return format.format(cell.getDateCellValue());
}

main路径 java 路径下定义包路径

cn.afterturn.easypoi.excel.imports

处理类：

/*** Copyright 2013-2015 JueYue (qrb.jueyue@gmail.com)* <p>* Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at* <p>* http://www.apache.org/licenses/LICENSE-2.0* <p>* Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package cn.afterturn.easypoi.excel.imports;import cn.afterturn.easypoi.excel.entity.params.ExcelImportEntity;
import cn.afterturn.easypoi.excel.entity.sax.SaxReadCellEntity;
import cn.afterturn.easypoi.exception.excel.ExcelImportException;
import cn.afterturn.easypoi.exception.excel.enums.ExcelImportEnum;
import cn.afterturn.easypoi.handler.inter.IExcelDataHandler;
import cn.afterturn.easypoi.handler.inter.IExcelDictHandler;
import cn.afterturn.easypoi.util.PoiPublicUtil;
import cn.afterturn.easypoi.util.PoiReflectorUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.DateUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.DateUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.sql.Time;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.ZoneId;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.Map;/*** Cell 取值服务* 判断类型处理数据 1.判断Excel中的类型 2.根据replace替换值 3.handler处理数据 4.判断返回类型转化数据返回** @author JueYue* 2014年6月26日 下午10:42:28*/
public class CellValueService {private static final Logger LOGGER = LoggerFactory.getLogger(CellValueService.class);private List<String> handlerList = null;/*** 获取单元格内的值** @param cell* @param entity* @return*/private Object getCellValue(String classFullName, Cell cell, ExcelImportEntity entity) {if (cell == null) {return "";}Object result = null;if ("class java.util.Date".equals(classFullName)|| "class java.sql.Date".equals(classFullName)|| ("class java.sql.Time").equals(classFullName)|| ("class java.time.Instant").equals(classFullName)|| ("class java.time.LocalDate").equals(classFullName)|| ("class java.time.LocalDateTime").equals(classFullName)|| ("class java.sql.Timestamp").equals(classFullName)) {//FIX: 单元格yyyyMMdd数字时候使用 cell.getDateCellValue() 解析出的日期错误if (CellType.NUMERIC == cell.getCellType() && DateUtil.isCellDateFormatted(cell)) {result = DateUtil.getJavaDate(cell.getNumericCellValue());} else {String val = "";try {val = cell.getStringCellValue();} catch (Exception e) {return null;}result = getDateData(entity, val);if (result == null) {return null;}}if (("class java.time.Instant").equals(classFullName)) {result = ((Date) result).toInstant();} else if (("class java.time.LocalDate").equals(classFullName)) {result = ((Date) result).toInstant().atZone(ZoneId.systemDefault()).toLocalDate();} else if (("class java.time.LocalDateTime").equals(classFullName)) {result = ((Date) result).toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();} else if (("class java.time.OffsetDateTime").equals(classFullName)) {result = ((Date) result).toInstant().atZone(ZoneId.systemDefault()).toOffsetDateTime();}  else if (("class java.time.ZonedDateTime").equals(classFullName)) {result = ((Date) result).toInstant().atZone(ZoneId.systemDefault());}  else if (("class java.sql.Date").equals(classFullName)) {result = new java.sql.Date(((Date) result).getTime());} else if (("class java.sql.Time").equals(classFullName)) {result = new Time(((Date) result).getTime());} else if (("class java.sql.Timestamp").equals(classFullName)) {result = new Timestamp(((Date) result).getTime());}} else {switch (cell.getCellType()) {case STRING:result = cell.getRichStringCellValue() == null ? "": cell.getRichStringCellValue().getString();break;case NUMERIC:if (DateUtil.isCellDateFormatted(cell)) {if ("class java.lang.String".equals(classFullName)) {result = formateDate(entity, cell.getDateCellValue());}if("class java.lang.Object".equals(classFullName)){SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");return format.format(cell.getDateCellValue());}} else {result = readNumericCell(cell);}break;case BOOLEAN:result = Boolean.toString(cell.getBooleanCellValue());break;case BLANK:break;case ERROR:break;case FORMULA:try {result = readNumericCell(cell);} catch (Exception e1) {try {result = cell.getRichStringCellValue() == null ? "": cell.getRichStringCellValue().getString();} catch (Exception e2) {throw new RuntimeException("获取公式类型的单元格失败", e2);}}break;default:break;}}return result;}private Object readNumericCell(Cell cell) {Object result = null;double value  = cell.getNumericCellValue();if (((int) value) == value) {result = (int) value;} else {result = value;}return result;}/*** 获取日期类型数据** @param entity* @param value* @return* @author JueYue* 2013年11月26日*/private Date getDateData(ExcelImportEntity entity, String value) {if (StringUtils.isNotEmpty(entity.getFormat()) && StringUtils.isNotEmpty(value)) {SimpleDateFormat format = new SimpleDateFormat(entity.getFormat());try {return format.parse(value);} catch (ParseException e) {try {return DateUtil.getJavaDate(Double.parseDouble(value));} catch (NumberFormatException ex) {LOGGER.error("时间格式化失败,格式化:{},值:{}", entity.getFormat(), value);throw new ExcelImportException(ExcelImportEnum.GET_VALUE_ERROR);}}}return null;}private String formateDate(ExcelImportEntity entity, Date value) {if (StringUtils.isNotEmpty(entity.getFormat()) && value != null) {SimpleDateFormat format = new SimpleDateFormat(entity.getFormat());return format.format(value);}return null;}/*** 获取cell的值** @param object* @param cell* @param excelParams* @param titleString* @param dictHandler*/public Object getValue(IExcelDataHandler<?> dataHandler, Object object, Object cell,Map<String, ExcelImportEntity> excelParams,String titleString, IExcelDictHandler dictHandler) throws Exception {ExcelImportEntity entity        = excelParams.get(titleString);String            classFullName = "class java.lang.Object";Class             clazz         = null;if (!(object instanceof Map)) {Method setMethod = entity.getMethods() != null && entity.getMethods().size() > 0? entity.getMethods().get(entity.getMethods().size() - 1) : entity.getMethod();Type[] ts = setMethod.getGenericParameterTypes();classFullName = ts[0].toString();clazz = (Class) ts[0];}Object result = null;if(cell instanceof Cell){result = getCellValue(classFullName, (Cell) cell, entity);}else{result = cell;}if (entity != null) {result = handlerSuffix(entity.getSuffix(), result);result = replaceValue(entity.getReplace(), result);result = replaceValue(entity.getReplace(), result);if (dictHandler != null && StringUtils.isNoneBlank(entity.getDict())) {result = dictHandler.toValue(entity.getDict(), object, entity.getName(), result);}}result = handlerValue(dataHandler, object, result, titleString);return getValueByType(classFullName, result, entity, clazz);}/*** 获取cell值** @param dataHandler* @param object* @param cellEntity* @param excelParams* @param titleString* @return*/public Object getValue(IExcelDataHandler<?> dataHandler, Object object,SaxReadCellEntity cellEntity, Map<String, ExcelImportEntity> excelParams,String titleString) {ExcelImportEntity entity = excelParams.get(titleString);Method setMethod = entity.getMethods() != null && entity.getMethods().size() > 0? entity.getMethods().get(entity.getMethods().size() - 1) : entity.getMethod();Type[] ts            = setMethod.getGenericParameterTypes();String classFullName = ts[0].toString();Object result        = cellEntity.getValue();result = handlerSuffix(entity.getSuffix(), result);result = replaceValue(entity.getReplace(), result);result = handlerValue(dataHandler, object, result, titleString);return getValueByType(classFullName, result, entity, (Class) ts[0]);}/*** 把后缀删除掉** @param result* @param suffix* @return*/private Object handlerSuffix(String suffix, Object result) {if (StringUtils.isNotEmpty(suffix) && result != null&& result.toString().endsWith(suffix)) {String temp = result.toString();return temp.substring(0, temp.length() - suffix.length());}return result;}/*** 根据返回类型获取返回值** @param classFullName* @param result* @param entity* @param clazz* @return*/private Object getValueByType(String classFullName, Object result, ExcelImportEntity entity, Class clazz) {try {//过滤空和空字符串,如果基本类型null会在上层抛出,这里就不处理了if (result == null || StringUtils.isBlank(result.toString())) {return null;}if ("class java.util.Date".equals(classFullName) && result instanceof String) {return DateUtils.parseDate(result.toString(), entity.getFormat());}if ("class java.lang.Boolean".equals(classFullName) || "boolean".equals(classFullName)) {return Boolean.valueOf(String.valueOf(result));}if ("class java.lang.Double".equals(classFullName) || "double".equals(classFullName)) {return Double.valueOf(String.valueOf(result));}if ("class java.lang.Long".equals(classFullName) || "long".equals(classFullName)) {try {return Long.valueOf(String.valueOf(result));} catch (Exception e) {//格式错误的时候,就用double,然后获取Int值return Double.valueOf(String.valueOf(result)).longValue();}}if ("class java.lang.Float".equals(classFullName) || "float".equals(classFullName)) {return Float.valueOf(String.valueOf(result));}if ("class java.lang.Integer".equals(classFullName) || "int".equals(classFullName)) {try {return Integer.valueOf(String.valueOf(result));} catch (Exception e) {//格式错误的时候,就用double,然后获取Int值return Double.valueOf(String.valueOf(result)).intValue();}}if ("class java.math.BigDecimal".equals(classFullName)) {return new BigDecimal(String.valueOf(result));}if ("class java.lang.String".equals(classFullName)) {//针对String 类型,但是Excel获取的数据却不是String,比如Double类型,防止科学计数法if (result instanceof String) {return result;}// double类型防止科学计数法if (result instanceof Double) {return PoiPublicUtil.doubleToString((Double) result);}return String.valueOf(result);}if (clazz != null && clazz.isEnum()) {if (StringUtils.isNotEmpty(entity.getEnumImportMethod())) {return PoiReflectorUtil.fromCache(clazz).execEnumStaticMethod(entity.getEnumImportMethod(), result);} else {return Enum.valueOf(clazz, result.toString());}}return result;} catch (Exception e) {LOGGER.error(e.getMessage(), e);throw new ExcelImportException(ExcelImportEnum.GET_VALUE_ERROR);}}/*** 调用处理接口处理值** @param dataHandler* @param object* @param result* @param titleString* @return*/@SuppressWarnings({"unchecked", "rawtypes"})private Object handlerValue(IExcelDataHandler dataHandler, Object object, Object result,String titleString) {if (dataHandler == null || dataHandler.getNeedHandlerFields() == null|| dataHandler.getNeedHandlerFields().length == 0) {return result;}if (handlerList == null) {handlerList = Arrays.asList(dataHandler.getNeedHandlerFields());}if (handlerList.contains(titleString)) {return dataHandler.importHandler(object, titleString, result);}return result;}/*** 替换值** @param replace* @param result* @return*/private Object replaceValue(String[] replace, Object result) {if (replace != null && replace.length > 0) {String   temp = String.valueOf(result);String[] tempArr;for (int i = 0; i < replace.length; i++) {tempArr = replace[i].split("_");if (temp.equals(tempArr[0])) {return tempArr[1];}}}return result;}
}