web开发中的文件上传

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1：下载两个组件
FileUpload下载地址：
　　http://commons.apache.org/fileupload/
　　下载：commons-fileupload-1.2.2-bin.zip 得到：commons-fileupload-1.2.2.jar
　　http://commons.apache.org/io/
　　下载：commons-io-1.4-bin.zip 得到：commons-io-1.4.jar
　　
2：新建一个jsp,名字为fileuplod.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%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 'fileupload.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 method="post" action="fileupload" enctype="multipart/form-data">        上传人：    <input name="name" type="text" id="name" size="20" ><br>        上传文件：   <input name="file" type="file" size="20" >        <input type="submit" name="submit" value="uplode" >    </form>  </body></html>

3:新建一个servlet,名字为fileuplod

import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.List;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class fileupload extends HttpServlet {        //上传到的路径     private String uploadPath="E://MyEclipse Professional 2014//Workspace//shop//WebRoot//admin//images//";     public void doGet(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {      doPost(request, response);     }     public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {         request.setCharacterEncoding("UTF-8");         DiskFileItemFactory factory = new DiskFileItemFactory();         ServletFileUpload upload = new ServletFileUpload(factory);         try {             List items = upload.parseRequest(request);             Iterator itr = items.iterator();             while (itr.hasNext()) {                 FileItem item = (FileItem) itr.next();                //判断上传的是不是文件                 if (item.isFormField()) {                            System.out.println("表单参数名:" + item.getFieldName() + "，表单参数值:" + item.getString("UTF-8"));                 } else {                     if (item.getName() != null && !item.getName().equals("")) {                         System.out.println("上传文件的大小:" + item.getSize());                         System.out.println("上传文件的类型:" + item.getContentType());                         System.out.println("上传文件的名称:" + item.getName());                         File tempFile = new File(uploadPath+item.getName());                         item.write(tempFile);                         System.out.println("上传文件成功！");                     }else{                         System.out.println("没有选择上传文件！");                     }                 }             }         }catch(FileUploadException e){             e.printStackTrace();         } catch (Exception e) {             e.printStackTrace();             System.out.print("上传文件失败！");         }     }    }

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