使用jQuery+SWFUpload+Commons-FileUpload实现带进度条的上传

程序员文章站 2024-02-02 12:42:10

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这两天在找一个可以实现上传时显示进度的ajax库，看了很多10 best ajax uploader之类的文章，发现里面很多链接都点不进去，或者网站文档和demo做得很烂，我这人选开源软件用，一定会看他的文档做得怎么样，做得不全就懒得研究了，swfupload文档做得也不好，例子太少，没有讲解，不过本着矬子里面拔高个的原则只能将就着用它了。外国有个人实现了一个swfuload的jquery插件，主要是完善swfupload的事件机制的，可以点这里去看看,结合这个插件，做多文件上传加进度条是件很easy的事情。官网的例子偏偏没有后端是java的例子，我又google了一番，试用了一下commons-fileupload，感觉很方便，于是就整出了一个例子来，前端是参照这个做了些修改。btw,iteye有好几篇是讲swfupload+java实现上传的，后端是个jsp自己实现的保存上传文件的，我下载了一下代码，发现一模一样，也不知是谁抄谁的，都宣称原创，好笑。

1.前面选择上传文件的页面upload.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
         pageEncoding="ISO-8859-1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
    <link href="css/default.css" rel="stylesheet" type="text/css"/>
    <script type="text/javascript" src="js/swfupload.js"></script>
    <script type="text/javascript" src="js/swfupload.queue.js"></script>
    <script type="text/javascript" src="js/fileprogress.js"></script>
    <script type="text/javascript" src="js/handlers.js"></script>
    <script type="text/javascript" src="js/jquery-1.4.3.js"></script>
    <script type="text/javascript" src="js/jquery.swfupload.js"></script>

    <style type="text/css">
        #swfupload-control p {
            margin: 10px 5px;
            font-size: 0.9em;
        }

        #log {
            margin: 0;
            padding: 0;
            width: 500px;
        }

        #log li {
            list-style-position: inside;
            margin: 2px;
            border: 1px solid #ccc;
            padding: 10px;
            font-size: 15px;
            font-family: Arial, Helvetica, sans-serif;
            color: #333;
            background: #fff;
            position: relative;
        }

        #log li .progressbar {
            border: 1px solid #333;
            height: 18px;
            background: #fff;
        }

        #log li .progress {
            background: rgba(104, 133, 127, 0.52);
            width: 0%;
            height: 18px;
        }

        #log li p {
            margin: 0;
            line-height: 18px;
        }

        #log li.success {
            border: 1px solid #339933;
            background: #ccf9b9;
        }

        #log li span.stopUpload {
            position: absolute;
            top: 5px;
            right: 5px;
            width: 20px;
            height: 20px;
            background: url('js/swfupload/cancel.png') no-repeat;
            cursor: pointer;
        }

        #img span.cancel {
            background: url('js/swfupload/cancel.png') no-repeat;
        }
    </style>

    <script type="text/javascript">
        $(function () {
            $('#swfupload-control').swfupload({
                upload_url:"handler/doUpload",
                file_post_name:'uploadfile',
                file_size_limit:"20000 MB",
                file_types:"*.*",
                file_types_description:"All files",
                flash_url:"js/swfupload.swf",
                button_image_url:'js/swfupload/wdp_buttons_upload_114x29.png',
                button_width:114,
                button_height:29,
                button_placeholder:$('#button')[0],
            })
                    .bind('fileQueued', function (event, file) {
                        var listitem = '<li id="' + file.id + '" >' +
                                'File: <em>' + file.name + '</em> (' + Math.round(file.size / 1024) + ' KB) <span class="progressvalue" ></span>' +
                                '<div class="progressbar" ><div class="progress" ></div></div>' +
                                '<p class="status" >Pending</p>' +
                                '<span class="stopUpload" >&nbsp;</span>' +
                                '</li>';
                        $('#log').append(listitem);
                        $('li#' + file.id + ' .stopUpload').bind('click', function () { //Remove from queue on cancel click
                            var swfu = $.swfupload.getInstance('#swfupload-control');
                            swfu.cancelUpload(file.id);
                            $('#log li#' + file.id).find('p.status').text('Canceled');
                            $('#log li#' + file.id).find('span.stopUpload').css('background-image','none')
                            $('#log li#' + file.id).find('span.stopUpload').css('cursor','defult')
//                            $('li#' + file.id).slideUp('fast');
                        });
                        // start the upload since it's queued
                        $(this).swfupload('startUpload');
                    })
                    .bind('fileQueueError', function (event, file, errorCode, message) {
                        //alert('Size of the file '+file.name+' is greater than limit');
                        alert(errorCode+":"+message)

                    })
                    .bind('fileDialogComplete', function (event, numFilesSelected, numFilesQueued) {
                        $('#queuestatus').text('Files Selected: ' + numFilesSelected + ' / Queued Files: ' + numFilesQueued);
                    })
                    .bind('uploadStart', function (event, file) {
                        $('#log li#' + file.id).find('p.status').text('Uploading...');
                        $('#log li#' + file.id).find('span.progressvalue').text('0%');
                        $('#log li#' + file.id).find('span.cancel').hide();
                    })
                    .bind('uploadProgress', function (event, file, bytesLoaded) {
                        //Show Progress
                        var percentage = Math.round((bytesLoaded / file.size) * 100);
                        $('#log li#' + file.id).find('div.progress').css('width', percentage + '%');
                        $('#log li#' + file.id).find('span.progressvalue').text(percentage + '%');
                    })
                    .bind('uploadSuccess', function (event, file, serverData) {
                        var item = $('#log li#' + file.id);
                        item.find('div.progress').css('width', '100%');
                        item.find('span.progressvalue').text('100%');
                        item.addClass('success').find('p.status').html('Done!!! ');
                        $('#log li#' + file.id).find('span.stopUpload').css('background-image','none') ;
                        $('#log li#' + file.id).find('span.stopUpload').css('cursor','default') ;
                    })
                    .bind('uploadComplete', function (event, file) {
                        // upload has completed, try the next one in the queue
                        $(this).swfupload('startUpload');
                    })
        });
    </script>
</head>
<body>

<div id="swfupload-control">
	<p>Select files of any type, muliple files are allowed to select every time.</p>
    <input type="button" id="button"/>

    <p id="queuestatus"></p>
    <ol id="log"></ol>
</div>
</body>
</html>

取消按钮的那个class如果叫cancel(原始例子是叫这个名字的)，是不好用的，html里总是有一些诡异的保留字在等着我们，我改成stopUpload就好用了。

2.后端保存文件的servlet

package com.offspring.servlet;


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;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

public class Upload extends javax.servlet.http.HttpServlet {
    public static final int MB = 1024 * 1024;

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {

        DiskFileItemFactory fileItemFactory = new DiskFileItemFactory(10 * MB, new File("d:/temp4"));
        ServletFileUpload uploader = new ServletFileUpload(fileItemFactory);
        uploader.setSizeMax(1200 * MB);
        List fields = null;
        try {
            fields = uploader.parseRequest(request);
        } catch (FileUploadException e) {
            e.printStackTrace();
            return;
        }
        Iterator iter = fields.iterator();
        while (iter.hasNext()) {
            FileItem item = (FileItem) iter.next();

            if (!item.isFormField()) {
                try {
                    processUploadedFile(item);
                } catch (Exception e) {
                    e.printStackTrace();
                   return;
                }
            }
        }

        response.getOutputStream().println("200 OK");


    }

    private void processUploadedFile(FileItem item) throws Exception {
        String basePath = "d:\\temp\\upload\\";
        item.write(new File(basePath + item.getName()));
        System.out.println("write file to '"+basePath + item.getName()+"'");
    }

}

运行时截图：

使用jQuery+SWFUpload+Commons-FileUpload实现带进度条的上传
你同时选多个文件也是可以的，不过仍然一次上传一个，一个传完了，下一个会自动开启上传。

3.实现进度条的原理

swfupload提供了很多事件，结合jquery可以绑定相应的回调函数，比如uploadProgress会在上传过程中定期被触发，你在这个回调里写个用css更新进度条宽度就OK了。

flashReady swfUploadLoaded fileDialogStart fileQueued fileQueueError fileDialogComplete uploadStart uploadProgress uploadError uploadSuccess uploadComplete

 .bind('uploadProgress', function (event, file, bytesLoaded) {
   //Show Progress
  var percentage = Math.round((bytesLoaded / file.size) * 100);
  $('#log li#' + file.id).find('div.progress').css('width', percentage + '%');
  $('#log li#' + file.id).find('span.progressvalue').text(percentage + '%');
   })

不过记得在linux上 uploadProgress 只会在上传结束时才触发，这是linux上flash的一个bug。本来写得很多，在firefox上上传附件不好用，然后文字还变成了乱码，这是怎么搞的？

代码可以在附件中找到。

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