public class UploadServlet extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
SmartUpload myupload = new SmartUpload();
ServletConfig config = getServletConfig();
myupload.initialize(config,req,resp);
resp.setContentType("text/html");
resp.setCharacterEncoding("utf-8");
PrintWriter out = resp.getWriter();
out.println("h2>处理上传的文件/h2>");
out.println("hr>");

try {
myupload.setMaxFileSize(1024*1024);
myupload.setTotalMaxFileSize(5*1024*1024);

myupload.setAllowedFilesList("doc,txt,jpg,gif");
myupload.setDeniedFilesList("exe,bat,jsp,htm,html");
myupload.upload();//上传文件，此项是必须的
int count = myupload.getFiles().getCount();
Request myRequest = myupload.getRequest();
String rndFilename,fileExtName,fileName,filePathName;
Date dt = null;
SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd");
//一一提取上传文件信息，同时可保持文件
for(int i = 0; i count; i++){
File file = myupload.getFiles().getFile(i);
if(file.isMissing())
continue;
fileName = new String(file.getFileName().getBytes(),"utf-8");//获取文件名
filePathName = new String(file.getFilePathName().getBytes(),"utf-8");
fileExtName = file.getFileExt();
dt = new Date(System.currentTimeMillis());
Thread.sleep(100);
rndFilename = fmt.format(dt)+i+"."+fileExtName;
out.println("第"+(i+1)+"个文件的文件信息：br>");
out.println(" 文件名为："+fileName+"br>");
out.println(" 文件扩展名为："+fileExtName+"br>");
out.println(" 文件全名："+filePathName+"br>");
out.println(" 文件大小："+file.getSize()/1024+"kbbr>");
//创建文件保存位置
ServletContext context = req.getServletContext();
String savePath = context.getRealPath("/upload/");
java.io.File folder = new java.io.File(savePath);
if(!folder.exists()){
folder.mkdirs();
}
out.println(" 文件保存路径："+savePath);
file.saveAs(savePath+"/"+rndFilename,SmartUpload.SAVE_PHYSICAL);
}

} catch (Exception e) {
out.println("文件上传失败！！！！");
e.printStackTrace();
}
out.flush();
out.close();

}
}

%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
%@ page import="com.jspsmart.upload.*" %>
%
//设定请求编码方式，否则遇到中文就会乱码
request.setCharacterEncoding("utf-8");
%>
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
title>上传文件实例/title>
script type="text/javascript" src="js/jquery-1.8.1.js">/script>
script type="text/javascript">
$(function(){
$("#number").change(function(){
var number = $("#number").attr("value");
$("#files").html("");
for(var i = 0; i number; i++){
$("#files").append("input type='file' name='file''"+i+"'>br/>");
}
});
});
/script>
/head>
body>
h2>上传文件实例/h2>
请选择上传文件数量：
select id="number">
option value="1" selected="selected">1/option>
option value="2">2/option>
option value="3">3/option>
option value="4">4/option>
option value="5">5/option>
/select>
form action="UploadServlet" method="post" enctype="multipart/form-data">
div id="files">/div>
input type="submit" value="提交"/>
/form>
/body>
/html>

%
response.setContentType("application/x-download");//设置为下载application/x-download
String filedownload = "/要下载的文件名";//即将下载的文件的相对路径
String filedisplay = "最终要显示给用户的保存文件名";//下载文件时显示的文件保存名称
String filenamedisplay = URLEncoder.encode(filedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename=" + filedisplay);
try
{
RequestDispatcher dis = application.getRequestDispatcher(filedownload);
if(dis!= null)
{
dis.forward(request,response);
}
response.flushBuffer();
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
}
%>