jsp如何利用POI直接生成Excel并在页面中导出

100%地抄的？

没必要使用POI了，当二进制文件抄

java中导出Excel有两个组件可以使用，一个是jxl，一个是POI，我这里用的是POI。导出是可以在服务器上生成文件，然后下载，也可以利用输出流直接在网页
中弹出对话框提示用户保存或下载。生成文件的方式会导致服务器中存在着垃圾文件，实现方式不太优雅，所以这里我采用的是后面直接通过输出流的方式。
1、修改WEB服务器的CONF/web.xml,添加
<mime-mapping>
<extension>xls</extension>
<mime-type>application/vnd.ms-excel</mime-type>
</mime-mapping>

如果不添加这个，那么在网页中下载的时候就变成了JSP文件

2、download.jsp文件

<%@ 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());
%>

注意不要有html代码，并且除了<% %> 中间的代码，其它的地方不要有空格。否则在导出文件的时候会在e69da5e887aa7a686964616f362后台出现异常，虽然不影响程序的使用，到时令人看起来
不太舒服

3、WriteExcel.java 生成Excel的JavaBean，复杂的应用请查看API

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 ");
}
}
}

通过以上三步，应该可以直接生成Excel文件下载或保存了，这在一些信息系统中相当有用。

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/shangyu79/archive/2008/07/21/2682541.aspx
jsp页面很简单阿。
一个table表格。
然后把需要展示的数据放入表格

简单的poiEXCEL操作。部分代码。嘿嘿
/**
* 创建标准模板
* @param request
* @param response
* @throws Exception
*/
private void createEXCELTemplet(HttpServletRequest request,
HttpServletResponse response) throws Exception {
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
HSSFSheet hssfsheet = hssfworkbook.createSheet();
String downloadFileName = sellActivityTitle;
createSheetTableTile(hssfsheet,ExcelConstantTitle.sellActivityTitleMap,TEMPLET_CELL_COUNT);
downloadEXCEL(hssfworkbook, downloadFileName, request, response);
}
/**
* 提供下载
* @param hssfworkbook
* @param downloadFileName
* @param request
* @param response
* @throws Exception
*/
private void downloadEXCEL(HSSFWorkbook hssfworkbook,
String downloadFileName, HttpServletRequest request,
HttpServletResponse response) throws Exception {
try {
//设置response,下载附件头设置
response.setContentType("application/vnd.ms-excel");
response.setHeader("content-disposition",
"attachment;filename=\""
+ new String(downloadFileName.getBytes("GBK"),
"ISO-8859-1") + "\";size="
+ hssfworkbook.getBytes().length);
OutputStream out = response.getOutputStream();
//将工作簿输出到response
hssfworkbook.write(out);
out.flush();
out.close();
} catch (Exception e) {
throw new Exception(e);
}
}

/**
* 创建校验数据之后的模板
*/
private void createValidateExcelAfterTemplet(HttpServletRequest request,
HttpServletResponse response,List list) throws Exception {
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
HSSFSheet hssfsheet = hssfworkbook.createSheet();
// 创建正文
String downloadFileName = validateSellActivityAfterTitle;
createSheetTableTile(hssfsheet,ExcelConstantTitle.sellActivityTitleMap,VALIDATE_AFTER_CELL_COUNT);
//添加数据
addSheetContentList(hssfsheet,ExcelConstantTitle.sellActivityContentMap,list);

downloadEXCEL(hssfworkbook, downloadFileName, request, response);
}
/**
* 创建EXCEL表头
* @param hssfsheet
* @param titleMap
* @param size
* @return
*/
private HSSFSheet createSheetTableTile(HSSFSheet hssfsheet,Map titleMap,int size){
// 创建正文
HSSFRow hssfrow = hssfsheet.createRow(0);
for (int i = 0; i < size; i++) {
// 设置列宽度
hssfsheet.setColumnWidth((short) i, (short) 4000);
HSSFCell hssfcell = hssfrow.createCell((short) i);
hssfcell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
switch (i) {
case 0:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 1:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 2:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 3:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 4:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 5:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
case 6:
hssfcell.setCellValue((String)titleMap.get(String.valueOf(i)));
break;
}
}
return hssfsheet;
}
/**
* 添加excel正文数据
*/
private HSSFSheet addSheetContentList(HSSFSheet hssfsheet,Map contentMap,List contentList){
for(int k = 0;k < contentList.size();k++){
HSSFRow hssfrow = hssfsheet.createRow(k+1);
for (int i = 0; i < VALIDATE_AFTER_CELL_COUNT; i++) {
Map map = (Map) contentList.get(k);
HSSFCell hssfcell = hssfrow.createCell((short) i);
hssfcell.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
switch (i) {
case 0:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 1:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 2:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 3:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 4:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 5:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
case 6:
hssfcell.setCellValue((String)map.get(contentMap.get(String.valueOf(i))));
break;
}
}
}
return hssfsheet;
}
吧不知道能不能帮你，我也不动感我在csdn看看的。实在不行你在那问问。。e79fa5e98193e59b9ee7ad94332。。。。。。。。。。。