ASP.NET 中使用 Plupload 上传图片

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：

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(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。

posted @ 2013-03-26 23:06 Charles Zhang 阅读(6201) 评论(8) 编辑收藏举报

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ASP.NET 中使用 Plupload 上传图片

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