首先说一下环境：Windows 7、JDK 6、MyEclipse 6.0、POI 3.8（下载地址：http://www.apache.org/dyn/closer.cgi/poi/release/bin/poi-bin-3.8-20120326.zip）

用到的jar包：

实体类BasicInfo.java代码：

package com.project.bean;public class Basicinfo {private String name;//姓名private String sex;//性别private String depart;//部门public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getDepart() {return depart;}public void setDepart(String depart) {this.depart = depart;}
}

导出Excel的Servlet  ExportExcel.java代码：

package com.project.servlet;import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;import com.project.bean.Basicinfo;public class ExportExcel extends HttpServlet {public ExportExcel() {super();}public void destroy() {super.destroy();}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.ProcessRequest(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.ProcessRequest(request, response);}/*** 导出Excel* @param request* @param response*/public void ProcessRequest(HttpServletRequest request,HttpServletResponse response){java.text.SimpleDateFormat format = new java.text.SimpleDateFormat("yyyyMMddhhmmss");String now = format.format(new Date());String exportFileName = "信息导出_"+now+".xls";//导出文件名List<Basicinfo> list = getInfoList();HSSFWorkbook workBook = null;String[] cellTitle = {"序号", "姓名", "性别", "部门"};try {workBook = new HSSFWorkbook();//创建工作薄HSSFSheet sheet = workBook.createSheet();workBook.setSheetName(0, "订单信息");//工作簿名称HSSFFont font = workBook.createFont();  font.setColor(HSSFFont.COLOR_NORMAL);font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);HSSFCellStyle cellStyle = workBook.createCellStyle();//创建格式cellStyle.setFont(font);cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//创建第一行标题 HSSFRow titleRow = sheet.createRow((short) 0);//第一行标题for(int i = 0,size = cellTitle.length; i < size; i++){//创建第1行标题单元格    sheet.setColumnWidth(i,4000);HSSFCell cell = titleRow.createCell(i,0);        cell.setCellStyle(cellStyle);cell.setCellValue(cellTitle[i]);}//从第二行开始写入数据for(int i=1,size = list.size();i<size;i++){HSSFRow row = sheet.createRow((short) i);Basicinfo entity = list.get(i);for (int j = 0,length=cellTitle.length; j < length; j++) {HSSFCell cell = row.createCell(j, 0);// 在上面行索引0的位置创建单元格cell.setCellType(HSSFCell.CELL_TYPE_STRING);// 定义单元格为字符串类型switch(j){// 在单元格中输入一些内容case 0:cell.setCellValue(String.valueOf(i));break;case 1:cell.setCellValue(entity.getName());break;case 2:cell.setCellValue(entity.getSex());break;case 3:cell.setCellValue(entity.getDepart());break;}}}// 表示以附件的形式把文件发送到客户端response.setHeader("Content-Disposition", "attachment;filename=" + new String((exportFileName).getBytes(), "ISO8859-1"));//设定输出文件头response.setContentType("application/vnd.ms-excel;charset=UTF-8");// 定义输出类型 // 通过response的输出流把工作薄的流发送浏览器形成文件OutputStream outStream = response.getOutputStream();workBook.write(outStream);outStream.flush();}catch(IOException e){System.out.println("IO 异常！"+e.getMessage());e.printStackTrace();}}/*** 模拟数据库获取信息* @return*/public List<Basicinfo> getInfoList(){List<Basicinfo> list = new ArrayList();for(int i=1;i<101;i++){Basicinfo entity = new Basicinfo();entity.setName("员工"+i);entity.setSex(i%2==1?"男":"女");entity.setDepart(i>80?"销售部":"财务部");list.add(entity);}return list;}public void init() throws ServletException {}}