java 后台解析excel上传数据 工具类

后台调用：

　　MultipartFile file；

　　List<String[]> excelDate

package com.holike.crm.partner.sys;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

/**
 * 解析excel 上传数据
 * @author Administrator
 *
 */
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();
                //循环除了第一行的所有行
                for(int rowNum = firstRowNum+1;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;
         }
         //把数字当成String来读，避免出现1读成1.0的情况
         if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
             cell.setCellType(Cell.CELL_TYPE_STRING);
         }
         //判断数据的类型
         switch (cell.getCellType()){
             case Cell.CELL_TYPE_NUMERIC: //数字
                 cellValue = String.valueOf(cell.getNumericCellValue());
                 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;
     }

}

= ExcelData.getExcelData(file);