MVC文件上传08-使用客户端jQuery-File-Upload插件和服务端Backload组件让每个用户有专属文件夹

当需要为每个用户建立一个专属上传文件夹的时候，可以在提交文件的视图中添加一个隐藏域，并设置name="objectContext"。

□ 在上传文件的视图中添加<input type="hidden" name="objectContext" value="user123" />

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<style type="text/css">
    .table-striped {
        width: 65%;
    }
</style>

<div>
        <!-- The file upload form used as target for the file upload widget -->
    <form >
         <input type="hidden" name="objectContext" value="user123" />
        <!-- Redirect browsers with JavaScript disabled to the origin page -->
        <noscript><input type="hidden" name="redirect" value="/"></noscript>
        <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
        <div class="row fileupload-buttonbar">
            <div class="span7">
                <!-- The fileinput-button span is used to style the file input field as button -->
                <span class="btn btn-success fileinput-button">
                    <i class="icon-plus icon-white"></i>
                    <span>添加文件...</span>
                    <input type="file" name="files[]" multiple>
                </span>
                <button type="submit" class="btn btn-primary start">
                    <i class="icon-upload icon-white"></i>
                    <span>开始上传</span>
                </button>
                <button type="reset" class="btn btn-warning cancel">
                    <i class="icon-ban-circle icon-white"></i>
                    <span>取消上传</span>
                </button>
                <button type="button" class="btn btn-danger delete">
                    <i class="icon-trash icon-white"></i>
                    <span>删除</span>
                </button>
                <input type="checkbox" class="toggle">
                <!-- The loading indicator is shown during file processing -->
                <span class="fileupload-loading"></span>
            </div>
            <!-- The global progress information -->
            <div class="span5 fileupload-progress fade">
                <!-- The global progress bar -->
                <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
                    <div class="bar" style="width:0%;"></div>
                </div>
                <!-- The extended global progress information -->
                <div class="progress-extended">&nbsp;</div>
            </div>
        </div>
        <!-- The table listing the files available for upload/download -->
        <table role="presentation" class="table table-striped"><tbody class="files" data-toggle="modal-gallery" data-target="#modal-gallery"></tbody></table>
    </form>  

        <!-- The template to display files available for upload -->
        <script >
        {% for (var i=0, file; file=o.files[i]; i++) { %}
            <tr class="template-upload fade">
                <td>
                    <span class="preview"></span>
                </td>
                <td>
                    <p class="name">{%=file.name%}</p>
                    {% if (file.error) { %}
                        <div><span class="label label-important">Error</span> {%=file.error%}</div>
                    {% } %}
                </td>
                <td>
                    <p class="size">{%=o.formatFileSize(file.size)%}</p>
                    {% if (!o.files.error) { %}
                        <div class="progress progress-success progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><div class="bar" style="width:0%;"></div></div>
                    {% } %}
                </td>
                <td>
                    {% if (!o.files.error && !i && !o.options.autoUpload) { %}
                        <button class="btn btn-primary start">
                            <i class="icon-upload icon-white"></i>
                            <span>Start</span>
                        </button>
                    {% } %}
                    {% if (!i) { %}
                        <button class="btn btn-warning cancel">
                            <i class="icon-ban-circle icon-white"></i>
                            <span>Cancel</span>
                        </button>
                    {% } %}
                </td>
            </tr>
        {% } %}
        </script>
        <!-- The template to display files available for download -->
        <script >
        {% for (var i=0, file; file=o.files[i]; i++) { %}
            <tr class="template-download fade">
                <td>
                    <span class="preview">
                        {% if (file.thumbnail_url) { %}
                            <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="gallery" download="{%=file.name%}"><img src="{%=file.thumbnail_url%}"></a>
                        {% } %}
                    </span>
                </td>
                <td>
                    <p class="name">
                        <a href="{%=file.url%}" title="{%=file.name%}" data-gallery="{%=file.thumbnail_url&&'gallery'%}" download="{%=file.name%}">{%=file.name%}</a>
                    </p>
                    {% if (file.error) { %}
                        <div><span class="label label-important">Error</span> {%=file.error%}</div>
                    {% } %}
                </td>
                <td>
                    <span class="size">{%=o.formatFileSize(file.size)%}</span>
                </td>
                <td>
                    <button class="btn btn-danger delete" data-type="{%=file.delete_type%}" data-url="{%=file.delete_url%}"{% if (file.delete_with_credentials) { %} data-xhr-fields='{"withCredentials":true}'{% } %}>
                        <i class="icon-trash icon-white"></i>
                        <span>Delete</span>
                    </button>
                    <input type="checkbox" name="delete" value="1" class="toggle">
                </td>
            </tr>
        {% } %}
        </script>      
    </div>


@section scripts
{
    @* <script src="~/Scripts/FileUpload/backload.demo.js"></script>*@
    <script src="~/Scripts/main.js"></script>
}

□ Backload配置文件Web.backload.config，设置getInclSubFolders ="true"

   1:  <?xml version="1.0"?>

2:

   3:  <backload xsi:noNamespaceSchemaLocation="Web.Backload.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:name="urn:backload-schema" thumbsUrlPattern="{Backload}"  getInclSubFolders ="true">

4:

   5:    <images width="200" height="200" dpi="96" resizeMode="ratio" />

   6:    <thumbnails path="_thumb" width="60" height="60" canvasColor="#00000000" resizeMode="place" imageType="image/png" />

   7:    <fileSystem filesRoot="~/Upload" />

   8:    <cacheManager lastModified="true" etag="true"/>

   9:  </backload>

□ 结果

上传界面：

在Upload文件夹中有用户user123的专属文件夹：

在user123文件夹中有上传图片和缩略图文件夹：

□ 其它传递用户信息方式

1、在JQuery File Upload初始化js文件中，通过post方式

   1:      $('#fileupload').bind('fileuploadsubmit', function (e, data) {

   2:          // The example input, doesn't have to be part of the upload form:

   3:          var $context = $('#objContext');

   4:          data.formData = { example: $context.val() };

   5:      });

2、在JQuery File Upload初始化js文件中，通过get方式

var fileUploadUrl = "/Backload/UploadHandler" + "&objectContext=user123";

参考资料：
※ http://backload.org/ Backload官网
※ https://github.com/blackcity/Backload#examples Backload例子
※ http://nuget.org/packages/Backload/ nuget上的Backload

※ http://blueimp.github.io/jQuery-File-Upload/ jQuery File Upload官网
※ https://github.com/blueimp/jQuery-File-Upload/wiki github上的jQuery File Upload介绍
※ https://github.com/blueimp/jQuery-File-Upload github上的jQuery File Upload源码

※ https://www.nuget.org/packages/JQueryFileUpload_Demo_with_Backload/ 下载jQuery File Upload结合Backload的MVC案例