poi读取excel总是少读一行是什么个情况？

package com.excel;



import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.util.ArrayList;

import java.util.List;



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;



public class ReadExcel {

	private static String path="D:/excel.xls";

	public static void main(String[] args) throws Exception {

		List<String>  strUser=new ArrayList<String>();

		File file=new File(path);

		FileInputStream fs=new FileInputStream(file);

		HSSFWorkbook wb=new HSSFWorkbook(fs);

		HSSFSheet sheet=wb.getSheet("新生记录");

		int lastRow=sheet.getLastRowNum();

		StringBuffer values=null;

		for(int i=1;i<lastRow+1;i++){

			HSSFRow row=sheet.getRow(i);

			short cellNum=row.getLastCellNum();

			values=new StringBuffer();

			for(int j=0;j<cellNum;j++){

				HSSFCell cell=row.getCell(j);

				if(j==0||j==2){

					cell.setCellType(HSSFCell.CELL_TYPE_STRING);

				}

				System.out.println(cell.getStringCellValue());

				values.append(cell.getStringCellValue()+",");

			}

			values.delete(values.length()-1, values.length());

			strUser.add(values.toString());

		}

		for(int i=0;i<strUser.size();i++){

			String[] user=strUser.get(i).split(",");

			System.out.println(new User(Integer.valueOf(user[0]),user[1],Integer.valueOf(user[2])));

		}

	}

}