利用POI生成Excel并通过Servlet下载示例

Java代码  
package com.ljz;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
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.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class downloadExcelServletextends HttpServlet {
private static final long serialVersionUID = 1L;
public downloadExcelServlet() {
super();
}
public void destroy() {
super.destroy();
}
private InputStream getInputStream() {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("sheet1");
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("序号");
cell = row.createCell((short) 1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("姓");
cell = row.createCell((short) 2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("名");
cell = row.createCell((short) 3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("年龄");
//创建一行记录
row = sheet.createRow(1);
cell = row.createCell((short) 0);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("1");
cell = row.createCell((short) 1);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("刘");
cell = row.createCell((short) 2);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("继忠");
cell = row.createCell((short) 3);
cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue("25");
// List<User> list = this.findAll();
//
// for (int i = 0; i < list.size(); ++i)
// {
// User user = list.get(i);
//
// row = sheet.createRow(i + 1);
//
// cell = row.createCell((short) 0);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(i + 1);
//
// cell = row.createCell((short) 1);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(user.getFirstname());
//
// cell = row.createCell((short) 2);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(user.getLastname());
//
// cell = row.createCell((short) 3);
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// cell.setCellValue(user.getAge());
// }
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
}
byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
return is;
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="
+ new String("系统日志.xls".getBytes(),"iso-8859-1"));
ServletOutputStream out = response.getOutputStream();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
bis = new BufferedInputStream(this.getInputStream());
bos = new BufferedOutputStream(out);
byte[] buff = new byte[2048];
int bytesRead;
// Simple read/write loop.
while (-1 != (bytesRead = bis.read(buff,0, buff.length))) {
bos.write(buff, 0, bytesRead);
}
} catch (final IOException e) {
System.out.println("IOException.");
throw e;
} finally {
if (bis != null)
bis.close();
if (bos != null)
bos.close();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
public void init() throws ServletException {
// Put your code here
}
}
转自：http://ljzcome.iteye.com/blog/402157