<%@ 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">

		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

		<link rel="stylesheet" type="text/css" href="css/uploadify.css">

		<script src="<%=basePath%>js/uploadify/jquery-1.4.2.min.js"></script>

		<script src="<%=basePath%>js/uploadify/jquery.uploadify.v2.1.4.min.js"></script>

		<script src="<%=basePath%>js/uploadify/swfobject.js"></script>

	</head>

	<body>

		This is my JSP page.

		<br>

		<table class="stable tp0" cellSpacing="0" cellPadding="0" border="0">

            <tr>

                <td width="15%" align="left" colspan="4" style="padding-left: 158px">

                    <input type="hidden" id="fileSize" value="0" />

                    <div id="custom-queue"></div> 附件：<input id="uploadify" type="file"

                    name="Filedata" />

                </td>

            </tr>

        </table>

	</body>

	<script type="text/javascript">

  $(document).ready(function(){

      $(document).ready(function () {

            $("#uploadify").uploadify({

                'uploader': '<%=basePath%>js/uploadify/uploadify.swf',

                'script': '<%=basePath%>servlet/UploadServlet',

                'cancelImg': '<%=basePath%>js/uploadify/cancel.png',

                'folder': 'upload',

                'queueID' : 'custom-queue',

                'auto':true,

                'multi':true,

                'fileDataName':'Filedata',

                 'onCancel' : function(file) {

                },

                'onUploadError' : function(file, errorCode, errorMsg, errorString) {

                    alert(456);

                }

            });

        });

  });

  </script>

</html>

package coms;

import java.io.File;

import java.io.IOException;

import java.util.Iterator;

import java.util.List;

import java.util.UUID;

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 UploadServlet extends HttpServlet {

    @Override

    protected void doPost(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        String savePath = this.getServletConfig().getServletContext()

                .getRealPath("");

        //保存文件的路径

        savePath = savePath + "/upload/";

        File f1 = new File(savePath);

        System.out.println(savePath);

        //如果文件不存在,就新建一个

        if (!f1.exists()) {

            f1.mkdirs();

        }

        //这个是文件上传需要的类,具体去百度看看,现在只管使用就好

        DiskFileItemFactory fac = new DiskFileItemFactory();

        ServletFileUpload upload = new ServletFileUpload(fac);

        upload.setHeaderEncoding("utf-8");

        List fileList = null;

        try {

            fileList = upload.parseRequest(request);

        } catch (FileUploadException ex) {

            return;

        }

        //迭代器,搜索前端发送过来的文件

        Iterator<FileItem> it = fileList.iterator();

        String name = "";

        String extName = "";

        while (it.hasNext()) {

            FileItem item = it.next();

            //判断该表单项是否是普通类型

            if (!item.isFormField()) {

                name = item.getName();

                long size = item.getSize();

                String type = item.getContentType();

                System.out.println(size + " " + type);

                if (name == null || name.trim().equals("")) {

                    continue;

                }

                // 扩展名格式： extName就是文件的后缀,例如 .txt

                if (name.lastIndexOf(".") >= 0) {

                    extName = name.substring(name.lastIndexOf("."));

                }

                File file = null;

                do {

                    // 生成文件名：

                    name = UUID.randomUUID().toString();

                    file = new File(savePath + name + extName);

                } while (file.exists());

                File saveFile = new File(savePath + name + extName);

                try {

                    item.write(saveFile);

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }

        response.getWriter().print(name + extName);

    }

}