最近弄项目需要一个异步的图片上传图片组件，首先选择了 swfupload，但是在使用中发现火狐下莫名其妙的会丢失 Session（不使用 global.asax 的情况下，没有找到完美的解决方案），后来找到了 Plupload，便去了解了一下。
Plupload官网：http://www.plupload.com
它是一个开源组件！功能的确很强大！
它主要功能是多文件上传，并提供图片客户端尺寸压缩。主要的特色是可以使用 Flash Gears HTML 5 Silverlight BrowserPlus HTML 4 等多项技术实现！
官网上的实例是用php写的，后来在http://www.cnblogs.com/zjfree/archive/2010/12/27/1918400.html找到了.net版的，我根据自己的需求做了些调整，美化了一下界面样式，调整了js代码，自己写了后台代码。
这是我参考了swfupload上传之后在页面上显示缩略图的效果图。
HTML代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>\</title>
<script language="javascript" type="text/javascript" src="/Static/Script/plupload/jquery.plupload.queue.min.js"></script>
<script language="javascript" type="text/javascript" src="/Static/Script/plupload/plupload.min.js"></script>
<script language="javascript" type="text/javascript" src="/Static/Script/plupload/plupload.flash.min.js"></script>
</head>
<body>
<div id="flash_uploader" style="width: 600px; height: 330px;">
请检查您的Flash插件是否正确安装！</div>
<div id="thumbnails">
</div>
<script type="text/javascript">
$(function () {
// 初始化Flash上传插件
$("#flash_uploader").pluploadQueue({
runtimes: 'flash', //使用Flash插件
url: '/Services.aspx?act=Upload', //服务器端响应页面
max_file_size: '10mb', //最大文件限制
file_size: '1mb', //一次上传数据大小
unique_names: true, //是否自动生成唯一名称
filters: [ //文件类型限制
{title: "图片文件", extensions: "jpg,gif,png" },
{ title: "压缩文件", extensions: "zip,rar" }
],
// 缩放图片
// resize: { width: 320, height: 240, quality: 80 },
// SWF文件位置
flash_swf_url: '/Static/Script/plupload/plupload.flash.swf',
init: {
FileUploaded: function (up, file, info) {
if (info.response != null) {
var jsonstr = eval("(" + info.response + ")");
var thumbnailUrl = jsonstr[0].thumbnailUrl;
var originalUrl = jsonstr[0].originalUrl;
var name = jsonstr[0].name;
//一个文件上传成功
addImage(name, originalUrl, thumbnailUrl);
}
},
Error: function (up, args) {
//发生错误
if (args.file) {
alert('[error] File:' + args.file);
} else {
alert('[error]' + args);
}
}
}
});
});
</script>
</body>
</html>
后台代码：
HttpContext context = HttpContext.Current;
string savePath = PathConfig.UploadPath(); //上传文件的路径
string uploadFileUrl = PathConfig.UploadUrl(); //上传文件的URL
HttpPostedFile uploadFile = context.Request.Files["file"];
try
{
//验证文件夹是否存在
if (!Directory.Exists(savePath))
{
Directory.CreateDirectory(savePath);
}
string fileName = uploadFile.FileName;
string name = DateTime.Now.ToString("yyyyMMddHHmmssfff");
if (fileName.LastIndexOf(".") > -1)
{
string fileExt = fileName.Substring(fileName.LastIndexOf("."));
string saveName = name + fileExt;
uploadFile.SaveAs(savePath + saveName);
string originalUrl = uploadFileUrl + saveName;
Image original_image = Image.FromStream(uploadFile.InputStream);
string thumbnail_id = name;
MemoryStream ms = new MemoryStream();
ms = ImageProcess.MakeThumbnail(original_image, 100, 100);
Image thumbnail = Image.FromStream(ms);
string imagePath = savePath + name + "-Thumbnail" + fileExt;
thumbnail.Save(imagePath, System.Drawing.Imaging.ImageFormat.Jpeg);
ThumbnailInfo thumb = new ThumbnailInfo(thumbnail_id, ms.GetBuffer());
string thumbnailUrl = uploadFileUrl + name + "-Thumbnail" + fileExt;
List<ThumbnailInfo> thumbnails = context.Session["file_info"] as List<ThumbnailInfo>;
if (thumbnails == null)
{
thumbnails = new List<ThumbnailInfo>();
context.Session["file_info"] = thumbnails;
}
thumbnails.Add(thumb);
context.Response.StatusCode = 200;
context.Response.Write("[{'name':'" + name + "','originalUrl':'" + originalUrl + "','thumbnailUrl':'" + thumbnailUrl + "'}]");
}
else
{
context.Response.StatusCode = 500;
context.Response.Write("error");
context.Response.End();
}
jquery.plupload.queue.min.js代码：
(function (c) {
var d = {};
function a(e) {
return plupload.translate(e) || e
}
function b(f, e) {
e.contents().each(function (g, h) {
h = c(h);
if (!h.is(".plupload")) {
h.remove()
}
});
e
.prepend('<div class="plupload_wrapper plupload_scroll"><div id="'
+ f
+ '_container" class="plupload_container"><div class="plupload"><div class="plupload_content"><div class="plupload_filelist_header"><div class="plupload_file_name">'
+ a("文件名称")
+ '</div><div class="plupload_file_action"> </div><div class="plupload_file_status"><span>'
+ a("文件状态")
+ '</span></div><div class="plupload_file_size">'
+ a("文件大小")
+ '</div><div class="plupload_clearer"> </div></div><ul id="'
+ f
+ '_filelist" class="plupload_filelist"></ul><div class="plupload_filelist_footer"><div class="plupload_file_name"><div class="plupload_buttons"><a href="#" class="plupload_button plupload_add">'
+ a("添加文件")
+ '</a><a href="#" class="plupload_button plupload_start">'
+ a("开始上传")
+ '</a></div><span class="plupload_upload_status"></span><div class="plupload_progress"><div class="plupload_progress_container"><div class="plupload_progress_bar"></div></div></div></div><div class="plupload_file_action"></div><div class="plupload_file_status"><span class="plupload_total_status">0%</span></div><div class="plupload_file_size"><span class="plupload_total_file_size">0 b</span></div><div class="plupload_clearer"> </div></div></div></div></div><input type="hidden" id="'
+ f
+ '_count" name="'
+ f
+ '_count" value="0" /></div>')
}
c.fn.pluploadQueue = function (e) {
if (e) {
this.each(function () {
var j, i, k;
i = c(this);
k = i.attr("id");
if (!k) {
k = plupload.guid();
i.attr("id", k)
}
j = new plupload.Uploader(c.extend({
dragdrop: true,
container: k
}, e));
d[k] = j;
function h(l) {
var m;
if (l.status == plupload.DONE) {
m = "plupload_done"
}
if (l.status == plupload.FAILED) {
m = "plupload_failed"
}
if (l.status == plupload.QUEUED) {
m = "plupload_delete"
}
if (l.status == plupload.UPLOADING) {
m = "plupload_uploading"
}
c("#" + l.id).attr("class", m).find("a").css("display",
"block")
}
function f() {
c("span.plupload_total_status", i).html(j.total.percent
+ "%");
c("div.plupload_progress_bar", i).css("width",
j.total.percent + "%");
c("span.plupload_upload_status", i).text("已上传 "
+ j.total.uploaded + "/" + j.files.length
+ " 文件。")
}
function g() {
var m = c("ul.plupload_filelist", i).html(""), n = 0, l;
c.each(j.files, function (p, o) {
l = "";
if (o.status == plupload.DONE) {
if (o.target_name) {
l += '<input type="hidden" name="' + k + "_"
+ n + '_tmpname" value="'
+ plupload.xmlEncode(o.target_name)
+ '" />'
}
l += '<input type="hidden" name="' + k + "_" + n
+ '_name" value="'
+ plupload.xmlEncode(o.name) + '" />';
l += '<input type="hidden" name="'
+ k
+ "_"
+ n
+ '_status" value="'
+ (o.status == plupload.DONE
? "done"
: "failed") + '" />';
n++;
c("#" + k + "_count").val(n)
}
m
.append('<li id="'
+ o.id
+ '"><div class="plupload_file_name"><span>'
+ o.name
+ '</span></div><div class="plupload_file_action"><a href="#"></a></div><div class="plupload_file_status">'
+ o.percent
+ '%</div><div class="plupload_file_size">'
+ plupload.formatSize(o.size)
+ '</div><div class="plupload_clearer"> </div>'
+ l + "</li>");
h(o);
c("#" + o.id + ".plupload_delete a").click(function (q) {
c("#" + o.id).remove();
j.removeFile(o);
q.preventDefault()
})
});
c("span.plupload_total_file_size", i).html(plupload
.formatSize(j.total.size));
if (j.total.queued === 0) {
c("span.plupload_add_text", i).text(a("Add files."))
} else {
c("span.plupload_add_text", i).text(j.total.queued
+ " files queued.")
}
c("a.plupload_start", i)
.toggleClass(
"plupload_disabled",
j.files.length == (j.total.uploaded + j.total.failed));
m[0].scrollTop = m[0].scrollHeight;
f();
if (!j.files.length && j.features.dragdrop
&& j.settings.dragdrop) {
c("#" + k + "_filelist")
.append('<li class="plupload_droptext">'
+ a("Drag files here.") + "</li>")
}
}
j.bind("UploadFile", function (l, m) {
c("#" + m.id).addClass("plupload_current_file")
});
j.bind("Init", function (l, m) {
b(k, i);
if (!e.unique_names && e.rename) {
c("#" + k + "_filelist div.plupload_file_name span", i)
.live("click", function (s) {
var q = c(s.target), o, r, n, p = "";
o = l
.getFile(q.parents("li")[0].id);
n = o.name;
r = /^(.+)(\.[^.]+)$/.exec(n);
if (r) {
n = r[1];
p = r[2]
}
q
.hide()
.after('<input type="text" />');
q.next().val(n).focus().blur(
function () {
q.show().next()
.remove()
}).keydown(function (u) {
var t = c(this);
if (u.keyCode == 13) {
u.preventDefault();
o.name = t.val()
+ p;
q.text(o.name);
t.blur()
}
})
})
}
c("a.plupload_add", i).attr("id", k + "_browse");
l.settings.browse_button = k + "_browse";
if (l.features.dragdrop && l.settings.dragdrop) {
l.settings.drop_element = k + "_filelist";
c("#" + k + "_filelist")
.append('<li class="plupload_droptext">'
+ a("Drag files here.") + "</li>")
}
c("#" + k + "_container").attr("title", "");
c("a.plupload_start", i).click(function (n) {
if (!c(this).hasClass("plupload_disabled")) {
j.start()
}
n.preventDefault()
});
c("a.plupload_stop", i).click(function (n) {
n.preventDefault();
j.stop()
});
c("a.plupload_start", i).addClass("plupload_disabled")
});
j.init();
j.bind("Error", function (l, o) {
var m = o.file, n;
if (m) {
n = o.message;
if (o.details) {
n += " (" + o.details + ")"
}
if (o.code == plupload.FILE_SIZE_ERROR) {
alert(a("Error: File to large: ") + m.name)
}
if (o.code == plupload.FILE_EXTENSION_ERROR) {
alert(a("Error: Invalid file extension: ") + m.name)
}
c("#" + m.id).attr("class", "plupload_failed")
.find("a").css("display", "block").attr(
"title", n)
}
});
j.bind("StateChanged", function () {
if (j.state === plupload.STARTED) {
c("li.plupload_delete a,div.plupload_buttons", i)
.hide();
c(
"span.plupload_upload_status,div.plupload_progress,a.plupload_stop",
i).css("display", "block");
c("span.plupload_upload_status", i).text("已上传 "
+ j.total.uploaded + "/" + j.files.length
+ " 文件");
if (e.multiple_queues) {
c(
"span.plupload_total_status,span.plupload_total_file_size",
i).show()
}
} else {
g();
c("a.plupload_stop,div.plupload_progress", i).hide();
c("a.plupload_delete", i).css("display", "block")
}
});
j.bind("QueueChanged", g);
j.bind("FileUploaded", function (l, m) {
h(m)
});
j.bind("UploadProgress", function (l, m) {
c("#" + m.id + " div.plupload_file_status", i)
.html(m.percent + "%");
h(m);
f();
if (e.multiple_queues
&& j.total.uploaded + j.total.failed == j.files.length) {
c(".plupload_buttons,.plupload_upload_status", i).css(
"display", "inline");
c(".plupload_start", i).addClass("plupload_disabled");
c(
"span.plupload_total_status,span.plupload_total_file_size",
i).hide()
}
});
if (e.setup) {
e.setup(j)
}
});
return this
} else {
return d[c(this[0]).attr("id")]
}
}
})(jQuery);
function addImage(name,originalUrl, thumbnailUrl) {
var newImg = document.createElement("img");
newImg.style.margin = "5px";
newImg.setAttribute("class", "thumbnail");
newImg.setAttribute("onclick", "InsertImages('" + name + "','" + originalUrl + "', '" + thumbnailUrl + "')");
document.getElementById("thumbnails").appendChild(newImg);
if (newImg.filters) {
try {
newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0;
} catch (e) {
// If it is not set initially, the browser will throw an error. This will set it if it is not set yet.
newImg.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + 0 + ')';
}
} else {
newImg.style.opacity = 0;
}
newImg.onload = function () {
fadeIn(newImg, 0);
};
newImg.src = thumbnailUrl;
// alert(src);
}
function fadeIn(element, opacity) {
var reduceOpacityBy = 5;
var rate = 30; // 15 fps
if (opacity < 100) {
opacity += reduceOpacityBy;
if (opacity > 100) {
opacity = 100;
}
if (element.filters) {
try {
element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;
} catch (e) {
// If it is not set initially, the browser will throw an error. This will set it if it is not set yet.
element.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')';
}
} else {
element.style.opacity = opacity / 100;
}
}
if (opacity < 100) {
setTimeout(function () {
fadeIn(element, opacity);
}, rate);
}
}
function uploadError(file, errorCode, message) {
var imageName = "error.gif";
var progress;
try {
switch (errorCode) {
case SWFUpload.UPLOAD_ERROR.FILE_CANCELLED:
try {
progress = new FileProgress(file, this.customSettings.upload_target);
progress.setCancelled();
progress.setStatus("Cancelled");
progress.toggleCancel(false);
}
catch (ex1) {
this.debug(ex1);
}
break;
case SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED:
try {
progress = new FileProgress(file, this.customSettings.upload_target);
progress.setCancelled();
progress.setStatus("Stopped");
progress.toggleCancel(true);
}
catch (ex2) {
this.debug(ex2);
}
case SWFUpload.UPLOAD_ERROR.UPLOAD_LIMIT_EXCEEDED:
imageName = "uploadlimit.gif";
break;
default:
alert(message);
break;
}
addImage("/Static/Images/swfupload/" + imageName);
} catch (ex3) {
this.debug(ex3);
}
}
这是我用的样式代码：
/*
Plupload
------------------------------------------------------------------- */
.plupload_button { display: -moz-inline-box; /* FF < 3*/ display: inline-block; font: normal 12px sans-serif; text-decoration: none; color: #42454a; border: 1px solid #bababa; padding: 2px 8px 3px 20px; margin-right: 4px; background: #f3f3f3 url('/Static/Images/plupload/buttons.png') no-repeat 0 center; outline: 0; /* Optional rounded corners for browsers that support it */ -moz-border-radius: 3px; -khtml-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; }
.plupload_button:hover { color: #000; text-decoration: none; }
.plupload_disabled, a.plupload_disabled:hover { color: #737373; border-color: #c5c5c5; background: #ededed url('/Static/Images/plupload/buttons-disabled.png') no-repeat 0 center; cursor: default; }
.plupload_add { background-position: -181px center; }
.plupload_wrapper { font: normal 12px Verdana,sans-serif; width: 100%; }
.plupload_container { padding: 8px 0px; background: url('/Static/Images/plupload/transp50.png'); /*-moz-border-radius: 5px;*/ }
.plupload_container input { border: 1px solid #DDD; font: normal 11px Verdana,sans-serif; width: 98%; }
.plupload_header { background: #2A2C2E url('/Static/Images/plupload/backgrounds.gif') repeat-x; }
.plupload_header_content { background: url('/Static/Images/plupload/backgrounds.gif') no-repeat 0 -317px; min-height: 56px; padding-left: 60px; color: #FFF; }
.plupload_header_title { font: normal 18px sans-serif; padding: 6px 0 3px; }
.plupload_header_text { font: normal 12px sans-serif; }
.plupload_filelist { margin: 0; padding: 0; list-style: none; border-left: 1px solid #99BBE8; border-right: 1px solid #99BBE8; }
.plupload_scroll .plupload_filelist { height: 240px; background: #F5F5F5; overflow-y: scroll; }
.plupload_filelist li { padding: 10px 8px; background: #F5F5F5 url('/Static/Images/plupload/backgrounds.gif') repeat-x 0 -156px; border-bottom: 1px solid #DDD; }
.plupload_filelist_footer { background: #DFDFDF; padding: 8px 8px; color: #42454A; }
.plupload_filelist_header { background: url("/Static/Images/plupload/grid3-hrow.gif") repeat-x scroll left bottom #F9F9F9; border-right: 1px solid #99BBE8; cursor: default; white-space: nowrap; padding: 8px; border-left: 1px solid #99BBE8; border-top: 1px solid #99BBE8; }
#thumbnails { width: 700px; float: left; }
.thumbnail { float: left; }
.plupload_filelist_footer { background: url("/Static/Images/plupload/bg.gif") repeat-x scroll left top #D0DEF0; height: 22px; line-height: 20px; vertical-align: middle; border: 1px solid #99BBE8; }
.plupload_file_name { float: left; overflow: hidden; width: 60%; }
.plupload_upload_status { float:left;}
.plupload_file_status { color: #777; }
.plupload_file_status span { color: #42454A; }
.plupload_file_size, .plupload_file_status, .plupload_progress { float: right; width: 15%; }
.plupload_file_size, .plupload_file_status, .plupload_file_action { text-align: right; }
.plupload_filelist .plupload_file_name { width: 60%; }
.plupload_file_action { float: right; width: 16px; height: 16px; margin-left: 15px; }
.plupload_file_action * { display: none; width: 16px; height: 16px; }
li.plupload_uploading { background: #ECF3DC url('/Static/Images/plupload/backgrounds.gif') repeat-x 0 -238px; }
li.plupload_done { color: #AAA; }
li.plupload_delete a { background: url('/Static/Images/plupload/delete.gif'); }
li.plupload_failed a { background: url('/Static/Images/plupload/error.gif'); cursor: default; }
li.plupload_done a { background: url('/Static/Images/plupload/done.gif'); cursor: default; }
.plupload_progress, .plupload_upload_status { display: none; }
.plupload_progress_container { margin-top: 3px; border: 1px solid #CCC; background: #FFF; padding: 1px; }
.plupload_progress_bar { width: 0px; height: 7px; background: #CDEB8B; }
.plupload_file_action, .plupload_scroll .plupload_filelist_footer .plupload_file_action { margin-right: 17px; }
/* Floats */
.plupload_clear, .plupload_clearer { clear: both; }
.plupload_clearer, .plupload_progress_bar { display: block; font-size: 0; line-height: 0; }
li.plupload_droptext { background: transparent; text-align: center; vertical-align: middle; border: 0; line-height: 165px; }
addImage和uploadError 方法是我从swfupload中提取出来的，用于上传成功后自动显示缩略图的，
newImg.setAttribute("onclick", "InsertImages('" + name + "','" + originalUrl + "', '" + thumbnailUrl + "')");是我想点击图片后插入到编辑器中用的。
这应该算一个不完整的程序吧，因为上传失败的方法还没有进行处理，等过段时间我好好整理一下再发布上来，另外我没有上传附件，其他代码可以去xiao张兄那里去下载，然后用我的代码替换相应的部分即可，水平有限让各位高手见笑了。
来源：https://www.cnblogs.com/weisenz/archive/2013/03/26/2983663.html