poi读excel出现了问题

Question

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;public class ExcelRead { 
    private HSSFWorkbook workbook; 
    private POIFSFileSystem fs;
    private File file; 
    private HSSFSheet sheet; 
    private HSSFRow row; 
    private HSSFCell cell; 
     
    public void read() throws IOException{ 
        String path = "D:\\08年度变电站电能表数及电量.xls";
        file = new File(path);
        fs = new POIFSFileSystem(new FileInputStream(file));//可能是LZ粘贴时漏掉了，至少应将Excel文档读到HSSFWorkbook 对象中；
        workbook = new HSSFWorkbook(fs);
        String aa = workbook.getSheetName(0); 
        sheet = workbook.getSheetAt(0);// 估计是错在这里，如果只有一个Sheet页的话，起始索引应为0；
        System.out.println(aa);         if(sheet==null){ 
            System.out.println("null"); 
        }
        int i = sheet.getLastRowNum(); 
        for(int k=0;k <i;k++){ 
            row = sheet.getRow(k); 
            for(int j = 0; j < row.getLastCellNum(); j++){ 
                cell = row.getCell((short)j); 
                String cellValue = "";
                if (cell != null) {
                    if (cell.getCellType() == HSSFCell.CELL_TYPE_STRING) {// 最好做一下转换，否则格式不一致时会抛转换异常
                     cellValue = cell.getStringCellValue();
                    } else if (cell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
                        double d = cell.getNumericCellValue();
                        if ((long) d < d) {
                         cellValue = String.valueOf(cell.getNumericCellValue());
                        } else {
                         cellValue = String.valueOf((long) cell.getNumericCellValue());
                        }
                    } else {
                        try {
                         cellValue = cell.getStringCellValue();
                        } catch (Exception e) {
                         cellValue = "";
                        }
                    }
                }
                System.out.println(cellValue); 
            } 
        } 
    }     public static void main(String []args){ 
        ExcelRead read = new ExcelRead(); 
        try{
         read.read(); 
        }catch(IOException e){
         e.printStackTrace();
        }        
    } 
}