此操作使用POI类库，请到以下URL下载：

http://apache.justdn.org/jakarta/poi/release/bin/poi-bin-2.5.1-final-20040804.zip

以下是源码：

package com.test;

import java.io.FileOutputStream;

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 java.io.FileInputStream;

import javax.swing.JOptionPane;

/**

 * 一个Excel文件的层次：Excel文件->工作表->行->单元格

 * 对应到POI中，为：workbook->sheet->row->cell

 */

public class POITest

{

    public static String outputFile = "e:\\test.xls";

public static String fileToBeRead = "e:\\test.xls";

    public void createExcel()

    {

        try

        {

            // 创建新的Excel 工作簿

            HSSFWorkbook workbook = new HSSFWorkbook();

            // 在Excel工作簿中建一工作表，其名为缺省值

            // 如要新建一名为"效益指标"的工作表，其语句为：

            // HSSFSheet sheet = workbook.createSheet("效益指标");

            HSSFSheet sheet = workbook.createSheet("效益指标");

            // 在索引0的位置创建行（最顶端的行）

            HSSFRow row = sheet.createRow((short)0);

            //在索引0的位置创建单元格（左上端）

            HSSFCell cell = row.createCell((short)0);

            // 定义单元格为字符串类型

            cell.setCellType(HSSFCell.CELL_TYPE_STRING);

            // 在单元格中输入一些内容

            cell.setCellValue("POI Excel Model");

            //下一行

            row=sheet.createRow( (short)1);

            cell=row.createCell( (short)0);

            //设置单元格内容

            cell.setCellValue( "Powered by 夏天");

            // 新建一输出文件流

            FileOutputStream fOut = new FileOutputStream(outputFile);

            // 把相应的Excel 工作簿存盘

            workbook.write(fOut);

            fOut.flush();

            // 操作结束，关闭文件

            fOut.close();

            System.out.println("文件生成...");

        }

        catch(Exception e)

        {

            System.out.println("已运行 xlCreate() : " + e);

        }

    }

    public void readExcel()

    {

        try

        {

            // 创建对Excel工作簿文件的引用

            HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));

            //System.out

            //  .println("===SheetsNum===" + workbook.getNumberOfSheets());//获取sheet数

            for(int numSheets = 0; numSheets < workbook.getNumberOfSheets(); numSheets++)

            {

                if(null != workbook.getSheetAt(numSheets))

                {

                    HSSFSheet aSheet = workbook.getSheetAt(numSheets); //获得一个sheet

                    for(int rowNumOfSheet = 0; rowNumOfSheet <= aSheet.getLastRowNum(); rowNumOfSheet++)

                    {

                        if(null != aSheet.getRow(rowNumOfSheet))

                        {

                            HSSFRow aRow = aSheet.getRow(rowNumOfSheet);

                            for(short cellNumOfRow = 0; cellNumOfRow <= aRow.getLastCellNum(); cellNumOfRow++)

                            {

                                if(null != aRow.getCell(cellNumOfRow))

                                {

                                    HSSFCell aCell = aRow.getCell(cellNumOfRow);

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

                                }

                            }

                        }

                    }

                }

            }

        }

        catch(Exception e)

        {

            System.out.println("ReadExcelError" + e);

        }

    }

    public static void main(String[] args)

    {

        POITest poi = new POITest();

        poi.createExcel();

        JOptionPane.showMessageDialog(null,"文件写入成功","POI",1);

        poi.readExcel();

        JOptionPane.showMessageDialog(null,"文件读取成功","POI",1);

    }

}