JavaExcel工具类(兼容xls和xlsx)

最近用上了导入excel表格处理保存到后台数据库的功能！利用的是org.apache.poi进行处理

示例代码：

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;/*** Created by LiYangYong on 2022/02/06*/
public class ExcelUtil {private final static String excel2003L =".xls";    //2003- 版本的excelprivate final static String excel2007U =".xlsx";   //2007+ 版本的excel/*** 描述：获取IO流中的数据，组装成List<List<Object>>对象* @param in,fileName* @return* @throws IOException*/public static  List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{List<List<Object>> list = null;//创建Excel工作薄Workbook work = getWorkbook(in,fileName);if(null == work){throw new Exception("创建Excel工作薄为空！");}Sheet sheet = null;Row row = null;Cell cell = null;list = new ArrayList<List<Object>>();//遍历Excel中所有的sheetfor (int i = 0; i < work.getNumberOfSheets(); i++) {sheet = work.getSheetAt(i);if(sheet==null){continue;}//遍历当前sheet中的所有行for (int j = sheet.getFirstRowNum()+1; j < sheet.getLastRowNum()+1; j++) {row = sheet.getRow(j);if(row==null){continue;}//  if(row==null||row.getFirstCellNum()==j){continue;}//遍历所有的列List<Object> li = new ArrayList<Object>();for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {cell = row.getCell(y);li.add(getCellValue(cell));}list.add(li);}}//work.close();return list;}/*** 描述：根据文件后缀，自适应上传文件的版本* @param inStr,fileName* @return* @throws Exception*/public static Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{Workbook wb = null;String fileType = fileName.substring(fileName.lastIndexOf("."));if(excel2003L.equals(fileType)){wb = new HSSFWorkbook(inStr);  //2003-}else if(excel2007U.equals(fileType)){wb = new XSSFWorkbook(inStr);  //2007+}else{throw new Exception("解析的文件格式有误！");}return wb;}/*** 描述：对表格中数值进行格式化* @param cell* @return*/public static Object getCellValue2(Cell cell){Object value = null;DecimalFormat df = new DecimalFormat("0");  //格式化number String字符SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字switch (cell.getCellType()) {case Cell.CELL_TYPE_STRING:value = cell.getRichStringCellValue().getString();break;case Cell.CELL_TYPE_NUMERIC:if("General".equals(cell.getCellStyle().getDataFormatString())){value = df.format(cell.getNumericCellValue());}else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){value = sdf.format(cell.getDateCellValue());}else{value = df2.format(cell.getNumericCellValue());}break;case Cell.CELL_TYPE_BOOLEAN:value = cell.getBooleanCellValue();break;case Cell.CELL_TYPE_BLANK:value = "";break;default:break;}return value;}@SuppressWarnings("deprecation")public static String getCellValue(Cell cell) {if (cell == null)return "";if (cell.getCellType() == Cell.CELL_TYPE_STRING) {return cell.getStringCellValue();} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {return String.valueOf(cell.getBooleanCellValue());} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {return cell.getCellFormula();} else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {short format = cell.getCellStyle().getDataFormat();System.out.println("format:"+format+";;;;;value:"+cell.getNumericCellValue());SimpleDateFormat sdf = null;if (format == 14 || format == 31 || format == 57 || format == 58|| (176<=format && format<=178) || (182<=format && format<=196)|| (210<=format && format<=213) || (208==format ) ) { // 日期sdf = new SimpleDateFormat("yyyy-MM-dd");} else if (format == 20 || format == 32 || format==183 || (200<=format && format<=209) ) { // 时间sdf = new SimpleDateFormat("HH:mm");} else { // 不是日期格式return String.valueOf(cell.getNumericCellValue());}double value = cell.getNumericCellValue();Date date = DateUtil.getJavaDate(value);if(date==null || "".equals(date)){return "";}String result="";try {result = sdf.format(date);} catch (Exception e) {e.printStackTrace();return "";}return result;}return "";}
}