<mime-mapping> 
    <extension>xls</extension> 
    <mime-type>application/vnd.ms-excel</mime-type> 
 </mime-mapping> 

<%@ page contentType="application/vnd.ms-excel" language="java" import="java.util.*,com.shangyu.action.WriteExcel" pageEncoding="GBK"%><% 
response.setHeader("Content-Disposition","attachment;filename=test123.xls");//指定下载的文件名 
response.setContentType("application/vnd.ms-excel");  
WriteExcel we=new WriteExcel(); 
we.getExcel("111.xls",response.getOutputStream()); 
%> 

package com.shangyu.action; 
import java.io.*; 
 
import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
import org.apache.poi.hssf.usermodel.HSSFSheet; 
import org.apache.poi.hssf.usermodel.HSSFRow; 
import org.apache.poi.hssf.usermodel.HSSFCell; 
public class WriteExcel  
{ 
 
 public  void  getExcel(String  sheetName,OutputStream  output)  
 { 
 HSSFWorkbook wb=new HSSFWorkbook(); 
 HSSFSheet sheet1=wb.createSheet("sheet1"); 
 HSSFRow row=sheet1.createRow((short)0); 
 HSSFCell cell=row.createCell((short)0); 
 cell.setCellValue(1); 
  
 row.createCell((short)1).setCellValue(2); 
 row.createCell((short)2).setCellValue(3); 
 row.createCell((short)3).setCellValue("中文字符"); 
  
  
 row=sheet1.createRow((short)1); 
 cell=row.createCell((short)0); 
 cell.setCellValue(1); 
  
 row.createCell((short)1).setCellValue(2); 
 row.createCell((short)2).setCellValue(3); 
 row.createCell((short)3).setCellValue("中文字符"); 
  
 //FileOutputStream fileout=new FileOutputStream("workbook.xls"); 
  
 try  {  
     output.flush();  
     wb.write(output);  
     output.close(); 
 }  catch  (IOException  e)  {  
     e.printStackTrace();  
     System.out.println( "Output  is  closed ");  
 }  
 } 
}