使用 apache fileupload ,spring MVC jquery1.6x , bootstrap 实现一个带进度条的多文件上传，由于fileupload 的局限，暂不能实现每个上传文件都显示进度条，只能实现一个总的进度条，效果如图：
1、jsp 页面
<!DOCTYPE html><%@ page contentType="text/htmlcharset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html charset=UTF-8" />
<script src="../js/jquery-1.6.4.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="../css/bootstrap.css"/>
</head>
<body>
<form id='fForm' class="form-actions form-horizontal" action="../upload.html"
encType="multipart/form-data" target="uploadf" method="post">
<div class="control-group">
<label class="control-label">上传文件:</label>
<div class="controls">
<input type="file" name="file" style="width:550">
</div>
<div class="controls">
<input type="file" name="file" style="width:550">
</div>
<div class="controls">
<input type="file" name="file" style="width:550">
</div>
<label class="control-label">上传进度:</label>
<div class="controls">
<div class="progress progress-success progress-striped" style="width:50%">
<div id = 'proBar' class="bar" style="width: 0%"></div>
</div>
</div>
</div>
<div class="control-group">
<div class="controls">
<button type="button" id="subbut" class="btn">submit</button>
</div>
</div>
</form>
<iframe name="uploadf" style="display:none"></iframe>
</body>
</html>
<script >
$(document).ready(function(){
$('#subbut').bind('click',
function(){
$('#fForm').submit()
var eventFun = function(){
$.ajax({
type: 'GET',
url: '../process.json',
data: {},
dataType: 'json',
success : function(data){
$('#proBar').css('width',data.rate+''+'%')
$('#proBar').empty()
$('#proBar').append(data.show)
if(data.rate == 100){
window.clearInterval(intId)
}
}})}
var intId = window.setInterval(eventFun,500)
})
})
</script>
2、java 代码
package com.controller
import java.util.List
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse
import javax.servlet.http.HttpSession
import org.apache.commons.fileupload.FileItemFactory
import org.apache.commons.fileupload.ProgressListener
import org.apache.commons.fileupload.disk.DiskFileItemFactory
import org.apache.commons.fileupload.servlet.ServletFileUpload
import org.apache.log4j.Logger
import org.springframework.stereotype.Controller
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RequestMethod
import org.springframework.web.bind.annotation.ResponseBody
import org.springframework.web.servlet.ModelAndView
@Controller
public class FileUploadController {
Logger log = Logger.getLogger(FileUploadController.class)
/**
* upload 上传文件
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value = "/upload.html", method = RequestMethod.POST)
public ModelAndView upload(HttpServletRequest request,
HttpServletResponse response) throws Exception {
final HttpSession hs = request.getSession()
ModelAndView mv = new ModelAndView()
boolean isMultipart = ServletFileUpload.isMultipartContent(request)
if(!isMultipart){
return mv
}
// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory()
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory)
upload.setProgressListener(new ProgressListener(){
public void update(long pBytesRead, long pContentLength, int pItems) {
ProcessInfo pri = new ProcessInfo()
pri.itemNum = pItems
pri.readSize = pBytesRead
pri.totalSize = pContentLength
pri.show = pBytesRead+"/"+pContentLength+" byte"
pri.rate = Math.round(new Float(pBytesRead) / new Float(pContentLength)*100)
hs.setAttribute("proInfo", pri)
}
})
List items = upload.parseRequest(request)
// Parse the request
// Process the uploaded items
// Iterator iter = items.iterator()
// while (iter.hasNext()) {
// FileItem item = (FileItem) iter.next()
// if (item.isFormField()) {
// String name = item.getFieldName()
// String value = item.getString()
// System.out.println("this is common feild!"+name+"="+value)
// } else {
// System.out.println("this is file feild!")
// String fieldName = item.getFieldName()
// String fileName = item.getName()
// String contentType = item.getContentType()
// boolean isInMemory = item.isInMemory()
// long sizeInBytes = item.getSize()
// File uploadedFile = new File("c://"+fileName)
// item.write(uploadedFile)
// }
// }
return mv
}
/**
* process 获取进度
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value = "/process.json", method = RequestMethod.GET)
@ResponseBody
public Object process(HttpServletRequest request,
HttpServletResponse response) throws Exception {
return ( ProcessInfo)request.getSession().getAttribute("proInfo")
}
class ProcessInfo{
public long totalSize = 1
public long readSize = 0
public String show = ""
public int itemNum = 0
public int rate = 0
}
}
1、引入bootstrap.css和jquery.js2、点击按钮后获取文件列表，添加到FormData，调用open函数指定类型与URL地址，在发起请求send（）；
3、监听onreadystatechange事件，当服务器回应后，把传回来的数据转换成JSON字符串，修改img的URL地址，让图片文件显示在页面中；
4、创建xhr对象开启监听文件上传进度，e.lengthComputable是true则计算进度条百分比，把结果给进度条；
5、进度条完成后，修改颜色，移除类添加类
HTML
JS
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