使用jQuery+SWFUpload+Commons-FileUpload实现带进度条的上传
注:摘自http://theoffspring.iteye.com/blog/1480092,这里只是做个备份,供自己学习使用!
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
Xml代码
- <%@ 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" > </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
Java代码
- 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：
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。
Js代码
- .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？