Ajax Upload; A file upload script with progress-bar, drag-and-drop .

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An older ajax upload plugin, which only used iframe for uploads, and was licensed under MIT license is located on github. This plugin uses XHR for uploading multiple files with progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden iframe based upload in other browsers, providing good user experience everywhere. Demo To upload a file, click on the button below. Drag-and-drop is supported in FF, Chrome. Progress-bar is supported in FF3.6+, Chrome6+, Safari4+

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More info please refer: valums.com/ajax-upload/

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这是一个比较好的插件，前端和后端都有实现。前端javascript ajax，后端支持 java 和 php，其他的语言应该也可以支持，但是需要自己实现文件接收。

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1。 server端 接收文件的 servlet：

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/*
 *  Copyright 2010 Blue Lotus Software, LLC.
 *  Copyright 2010 John Yeary <jyeary@bluelotussoftware.com>.
 *  Copyright 2010 Allan O'Driscoll
 *
 * Dual Licensed MIT and GPL v.2 
 *
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 *
 * The GNU General Public License (GPL) Version 2, June 1991
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; version 2 of the License.

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package com.bluelotussoftware.apache.commons.fileupload.example;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.io.IOUtils;

import wavefancy.Utilities;

/**
 * Reads an <code>application/octet-stream</code> and writes it to a file.
 * @author John Yeary <jyeary@bluelotussoftware.com>
 * @author Allan O'Driscoll
 * @version 1.0
 */
public class OctetStreamReader extends HttpServlet {

    private static final long serialVersionUID = 6748857432950840322L;
    private static final String DESTINATION_DIR_PATH = "userImg";
    private static String realPath;

    /**
     * {@inheritDoc}
     * @param config
     * @throws Serv