jsp中excel文件的创建与读取

1.创建excel文件
//这里的jxl不是java的标准jar包，需要在项目中另外加载
import jxl.Workbook;  
import jxl.write.Label;  
import jxl.write.WritableSheet;  
import jxl.write.WritableWorkbook;  
  
public class ExcelDownload extends HttpServlet {  
  
    public void doGet(HttpServletRequest request, HttpServletResponse response)  
            throws ServletException, IOException {  
  
        // 生成xls  
        try {  
            Date d = new Date();  
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_kkmmss ");  
            String random = sdf.format(d);  
            String targetFile = random + ".excel";  
            response.setContentType("application/vnd.ms-excel");  
            response.addHeader("Content-Disposition",  
                    "attachment;   filename="" + targetFile + """);  
            OutputStream os = response.getOutputStream();  
            WritableWorkbook wwb = Workbook.createWorkbook(os);  
            // 新建一张表  
            WritableSheet wsheet = wwb.createSheet("record", 0);  
            // 设置表头  
            Label label = new Label(0, 0, "");  
            wsheet.addCell(label);  
            label = new Label(0, 0, "会员姓名");  
            wsheet.addCell(label);  
            label = new Label(1, 0, "卡号");  
            wsheet.addCell(label);  
            label = new Label(2, 0, "联系地址");  
            wsheet.addCell(label);  
            label = new Label(3, 0, "邮编");  
            wsheet.addCell(label);  
            label = new Label(4, 0, "联系电话");  
            wsheet.addCell(label);  
            label = new Label(5, 0, "手机");  
            wsheet.addCell(label);  
            label = new Label(6, 0, "Email");  
            wsheet.addCell(label);  
            label = new Label(7, 0, "性别");  
            wsheet.addCell(label);  
  
            wwb.write();  
            wwb.close();  
            os.close();  
            response.flushBuffer();  
  
        } catch (Exception e) {  
            System.out.println("生成信息表(Excel格式)时出错：");  
            e.printStackTrace();  
        }  
  
    }  
} 

2.读取excel文件

import java.io.*;
import jxl.*;
public class ReadExcel 
{
public static void main(String[] args) 
{
try{
Workbook book=Workbook.getWorkbook(new File("c:	est.xls")); 
//获得第一个工作表对象
Sheet sheet=book.getSheet(0);
//得到第2行第1列的单元格
Cell cell1=sheet.getCell(0,1);
String result=cell1.getContents();
System.out.println(result);
book.close();
}
catch(Exception e){
System.out.println(e);
}
}
}

3.修改excel文件，执行结果是在原有文件中加入了一个新的工作表

import java.io.*;
import jxl.*;
import jxl.write.*;
public class UpdateExcel 
{
 
 public static void main(String[] args) 
{
  try  {
   //获得Excel文件
   Workbook wb=Workbook.getWorkbook(new File("c://test.xls"));  
   //打开一个文件的副本，并且指定数据写回到原文件
   WritableWorkbook book=
   Workbook.createWorkbook(new File("c://test.xls"),wb);  
   //添加一个工作表eet,在第一行第一列填写内容
   WritableSheet sheet=book.createSheet("第二页",1);
   sheet.addCell(new Label(0,0,"http://www.sunleap.com"));  
   book.write();
   book.close();
  }catch(Exception e){
   System.out.println(e);
  }
  System.out.println("操作结束！");
  
 }
}

详细使用，请参考jxl的api文档