1.上传的步骤：
a.导入SmartUpload.jar
b.创建一个上传的类的对象
c.初始化
d.上传至服务器
e.保存
表单提交时需要指定enctype="multipart/form-data"（多数据类型提交）
http://www.atguigu.com/opensource.shtml#3（包下载地址）
package com.zuxia.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;
/**
*文件上传
*/
public class UploadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//创建一个上传/下载的类的对象
SmartUpload su = new SmartUpload();
//初始化对象
su.initialize(getServletConfig(), request, response);
try {
//设置上传文件的信息(文件大小、文件类型)
//设置允许上传的文件的类型
su.setAllowedFilesList("txt,jpg,png,gif,mp3");
//设置不允许上传的文件的类型
su.setDeniedFilesList("exe");
//设置文件上传的大小限制
su.setMaxFileSize(1024*1024*2);//2M字节数
//上传文件至服务器
su.upload();
//指定文件保存路径
su.save("/files");
System.out.println("上传成功！");
response.sendRedirect("../show.jsp");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/*index.jsp*/
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP ‘index.jsp‘ starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="servlet/UploadServlet" method="post" enctype="multipart/form-data">
<input type="file" name="myfile"/><br/><br/>
<input type="file" name="myfile"/><br/><br/>
<input type="file" name="myfile"/><br/><br/>
<input type="submit" value="上传"/>
</form>
</body>
</html>