Eclipse教程(五)在Eclipse中导入/导出数据到Excel中 - 爱克软件

时间:2024-03-08 15:33:35

在Eclipse中导入/导出数据到Excel中

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);
    }
}
 
可使用Eclipse或是Jbuilder打开测试