使用POI读取Excel表

package com.oadmin.superapp.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
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 com.oadmin.superapp.vo.OrderVO;

public class ReadExcle {
    public static void main(String[] args) {
        try {
            List<OrderVO> list= readXls(new File("D://未发货订单列表20170831.xls"));
            System.out.println(list.get(0).getAppId());
        } catch (IOException e) {
            e.printStackTrace();
            
        }
    }

    public static List<OrderVO> readXls(File file) throws IOException {  
        List<OrderVO> list = new ArrayList<OrderVO>();
         try{  
                //XSSF和HSSF虽然在不同的包里，但却引用了同一接口Workbook，可以用下面判断  
                Workbook wb = null;  
                FileInputStream fi = new FileInputStream(file);    
              /*  if (systemObjFileFileName.toLowerCase().endsWith("xls")) {   
                     
                }else if(systemObjFileFileName.toLowerCase().endsWith("xlsx")) {   
                    wb = new XSSFWorkbook(fi);  
                }*/
                wb = new HSSFWorkbook(fi); 
                Sheet sheet = wb.getSheetAt(0);    
                    
                int rowNum = sheet.getLastRowNum()+1;    
                //i 从1开始表示第一行为标题 不包含在数据中  
                for(int i=1;i<rowNum;i++){  
                    OrderVO systemObject  = new OrderVO();
                    Row row = sheet.getRow(i);    
                    int cellNum = row.getLastCellNum(); 
                    for(int j=0;j<cellNum;j++){    
                        Cell cell = row.getCell(j);
                        String cellValue = null;
                        if(cell != null){
                            cell.setCellType(Cell.CELL_TYPE_STRING);
                            cellValue = cell.getStringCellValue();    
                        }
                        switch(j){//通过列数来判断对应插如的字段    
                            //数据中不应该保护ID这样的主键记录                        
                            case 0 : systemObject.setOrder(cellValue);break;    
                            case 1 : systemObject.setCompany(cellValue);break;
                            case 2 : systemObject.setOrder_number(cellValue);break; 
                            case 3 : systemObject.setAppId(UUID.fromString(cellValue));break; 
                            case 4 : systemObject.setOrderId(UUID.fromString(cellValue));break; 
                        } 
                    } 
                    list.add(systemObject);
                }
            }catch(Exception e){    
                e.printStackTrace();  
            }
        return list;
    }
}