文件上传
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>
                    
                
                
            
        
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