java 解析excel工具类

1.导入excel然后解析工具类

package com.zhl.scheduling.utils;

/**
 * @Author TAO
 * @ClassName ExcelData
 * @Description TODO
 * @Date 2019/1/9 15:02
 * @Version 1.0
 */

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;

import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

/**
 * 解析excel 上传数据
 *
 *
 */
public class ExcelData {

  private static final Logger log = Logger.getLogger(ExcelData.class);

  public static List<String[]> getExcelData(MultipartFile file) throws IOException{
    checkFile(file);
    //获得Workbook工作薄对象
    Workbook workbook = getWorkBook(file);
    //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
    List<String[]> list = new ArrayList<String[]>();
    if(workbook != null){
      for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
        //获得当前sheet工作表
        Sheet sheet = workbook.getSheetAt(sheetNum);
        if(sheet == null){
          continue;
        }
        //获得当前sheet的开始行
        int firstRowNum  = sheet.getFirstRowNum();
        //获得当前sheet的结束行
        int lastRowNum = sheet.getLastRowNum();
        //循环除了所有行,如果要循环除第一行以外的就firstRowNum+1
        for(int rowNum = firstRowNum;rowNum <= lastRowNum;rowNum++){
          //获得当前行
          Row row = sheet.getRow(rowNum);
          if(row == null){
            continue;
          }
          //获得当前行的开始列
          int firstCellNum = row.getFirstCellNum();
          //获得当前行的列数
          int lastCellNum = row.getLastCellNum();
          String[] cells = new String[row.getLastCellNum()];
          //循环当前行
          for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
            Cell cell = row.getCell(cellNum);
            cells[cellNum] = getCellValue(cell);
          }
          list.add(cells);
        }
      }
    }
    return list;
  }


  /**
   * 检查文件
   * @param file
   * @throws IOException
   */
  public static  void checkFile(MultipartFile file) throws IOException{
    //判断文件是否存在
    if(null == file){
      log.error("文件不存在！");
    }
    //获得文件名
    String fileName = file.getOriginalFilename();
    //判断文件是否是excel文件
    if(!fileName.endsWith("xls") && !fileName.endsWith("xlsx")){
      log.error(fileName + "不是excel文件");
    }
  }
  public static  Workbook getWorkBook(MultipartFile file) {
    //获得文件名
    String fileName = file.getOriginalFilename();
    //创建Workbook工作薄对象，表示整个excel
    Workbook workbook = null;
    try {
      //获取excel文件的io流
      InputStream is = file.getInputStream();
      //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
      if(fileName.endsWith("xls")){
        //2003
        workbook = new HSSFWorkbook(is);
      }else if(fileName.endsWith("xlsx")){
        //2007 及2007以上
        workbook = new XSSFWorkbook(is);
      }
    } catch (IOException e) {
      log.error(e.getMessage());
    }
    return workbook;
  }

  public static String getCellValue(Cell cell){
    String cellValue = "";
    if(cell == null){
      return cellValue;
    }
    //判断数据的类型
    switch (cell.getCellType()){
      case Cell.CELL_TYPE_NUMERIC: //数字
        cellValue = stringDateProcess(cell);
        break;
      case Cell.CELL_TYPE_STRING: //字符串
        cellValue = String.valueOf(cell.getStringCellValue());
        break;
      case Cell.CELL_TYPE_BOOLEAN: //Boolean
        cellValue = String.valueOf(cell.getBooleanCellValue());
        break;
      case Cell.CELL_TYPE_FORMULA: //公式
        cellValue = String.valueOf(cell.getCellFormula());
        break;
      case Cell.CELL_TYPE_BLANK: //空值
        cellValue = "";
        break;
      case Cell.CELL_TYPE_ERROR: //故障
        cellValue = "非法字符";
        break;
      default:
        cellValue = "未知类型";
        break;
    }
    return cellValue;
  }


  public static String stringDateProcess(Cell cell){
    String result = new String();
    if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式
      SimpleDateFormat sdf = null;
      if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) {
        sdf = new SimpleDateFormat("HH:mm");
      } else {// 日期
        sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
      }
      Date date = cell.getDateCellValue();
      result = sdf.format(date);
    } else if (cell.getCellStyle().getDataFormat() == 58) {
      // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58)
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
      double value = cell.getNumericCellValue();
      Date date = org.apache.poi.ss.usermodel.DateUtil
          .getJavaDate(value);
      result = sdf.format(date);
    } else {
      double value = cell.getNumericCellValue();
      CellStyle style = cell.getCellStyle();
      DecimalFormat format = new DecimalFormat();
      String temp = style.getDataFormatString();
      // 单元格设置成常规
      if (temp.equals("General")) {
        format.applyPattern("#");
      }
      result = format.format(value);
    }

    return result;
  }




}