AngularJS之WebAPi上传(十)

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AngularJS之WebAPi上传(十)

jeffcky 2016-06-06 22:39:00 浏览573
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前言

前面一系列我们纯粹是讲AngularJS,在讲一门知识时我们应该结合之前所学综合起来来做一个小的例子,前面我们讲了在MVC中上传文件的例子,在本节我们讲讲如何利用AngularJS在WebAPi中如何上传,来巩固下WebAPi并结合AngularJS中对应的一些组件学习下。

AngularJS Upload Files for WebAPi

(一)在WebAPi中我们如何获得上传本地文件的物理路径呢?需要实现此类: MultipartFormDataStreamProvider ,从该类中获取上传文件的物理路径并返回。如下:

    public class UploadMultipartFormProvider : MultipartFormDataStreamProvider
    {
        public UploadMultipartFormProvider(string rootPath) : base(rootPath) { }

        public override string GetLocalFileName(HttpContentHeaders headers)
        {
            if (headers != null &&
                headers.ContentDisposition != null)
            {
                return headers
                    .ContentDisposition
                    .FileName.TrimEnd('"').TrimStart('"');
            }

            return base.GetLocalFileName(headers);
        }
    }

(二)为避免有些浏览器不支持多个文件上传我们通过实现 ActionFilterAttribute 特性来加以判断,如下:

    public class MimeMultipart : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            if (!actionContext.Request.Content.IsMimeMultipartContent())
            {
                throw new HttpResponseException(
                    new HttpResponseMessage(
                        HttpStatusCode.UnsupportedMediaType)
                );
            }
        }

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {

        }
    }

以上两个类为我们在WebAPi中上传提供一个保障。接下来我们需要的是如何利用AngularJS来上传。

在AngularJS中上传需要用到 ng-file-upload 组件,而非 angularFileUpload 组件,在此之前一直是利用angularFileUpload组件,但是后来逐步迁移并且命名为ng-file-upload组件。同时为了一些加载效果如在github中顶部有加载线的过程,决定也在这里实现一下看看【说明:上传过程用到angular-loading-bar(加载)和ng-file-upload(上传)组件】。

脚本

(1)为了重用,我们将加载组件进行封装。

 //common.load.js
(function () { 'use strict'; angular .module('common.load', [ 'angular-loading-bar', 'ngAnimate' ]); })();

(2)启动加载线。

//loadBarCtrl.js
(function (app) { "use strict"; app.controller("loadCtrl", loadCtrl); function loadCtrl(cfpLoadingBar) { cfpLoadingBar.start(); } })(angular.module("common.load"));

(3)上传文件代码

 //fileUploadCtrl.js
(function (app) { 'use strict'; app.controller('fileUploadCtrl', fileUploadCtrl); fileUploadCtrl.$inject = ['$scope', '$http', '$timeout', 'Upload']; function fileUploadCtrl($scope, $http, $timeout, Upload, cfpLoadingBar) { $scope.upload = []; $scope.UploadedFiles = []; $scope.startUploading = function ($files) { for (var i = 0; i < $files.length; i++) { var $file = $files[i]; (function (index) { $scope.upload[index] = Upload.upload({ url: "/api/upload", method: "POST", file: $file, withCredentials: false }).progress(function (evt) { }).success(function (data, status, headers, config) { $scope.UploadedFiles.push({ FileName: data.FileName, FilePath: data.LocalFilePath, FileLength: data.FileLength }); cfpLoadingBar.complete(); }).error(function (data, status, headers, config) { }); })(i); } } } })(angular.module("common.load"));

(4)加载主模块以及依赖模块。

 //app.js
(function () { 'use strict'; angular .module('angularUploadApp', [ 'ngRoute', 'ngFileUpload', 'common.load' ]) .config(config) config.$inject = ['$routeProvider']; function config($routeProvider) { $routeProvider .when('/', { templateUrl: '../../app/templates/fileUpload.html', controller: 'fileUploadCtrl' }) .otherwise({ redirectTo: '/' }); } })();

界面 

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta charset="utf-8" />
    <title></title>
    <link href="~/Content/bootstrap.min.css" rel="stylesheet" />
    <link href="~/Content/loading-bar.min.css" rel="stylesheet" media="all" />
</head>
<body ng-app="angularUploadApp" ng-controller="loadCtrl">
    <nav class="navbar navbar-default" role="navigation">

        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="http://www.cnblogs.com/createmyself">Angular File WebAPi Upload by <i style="color:#2da12d;font-weight:bolder;">xpy0928</i></a>
        </div>
        <div id="navbar" class="navbar-collapse collapse">

        </div>

    </nav>
    <div class="container">
        <div ng-include src="'../../app/templates/fileUpload.html'"></div>
    </div>
    <script src="../../Scripts/jquery-1.10.2.min.js"></script>
    <script src="../../Scripts/angular.min.js"></script>
    <script src="../../Scripts/angular-animate.min.js"></script>
    <script src="../../Scripts/angular-route.js"></script>
    <script src="../../app/plugins/loading-bar.min.js"></script>
    <script src="../../app/modules/common.load.js"></script>
    <script src="../../Scripts/ng-file-upload.min.js"></script>
    <script src="../../app/app.js"></script>
    <script src="../../app/controllers/loadBarCtrl.js"></script>
    <script src="../../app/controllers/fileUploadCtrl.js"></script>
</body>
</html>

模板页:

<div class="row" ng-controller="fileUploadCtrl">
    <div class="col-xs-3">
        <div>
            <input type="file" accept="images/*" ngf-pattern="'.png,.jpg,.gif'" ngf-select="startUploading($files)" multiple>
        </div>
    </div>
    <div class="col-xs-9">
        <div class="panel-body">
            <div class="panel panel-default" ng-repeat="uploadedFile in UploadedFiles track by $index">
                <div class="panel-heading">
                    <strong>{{uploadedFile.FileName}}</strong>
                </div>
                <div class="panel-body">
                    <div class=" media">
                        <a class="pull-left" href="#">
                            <img class="media-object" width="100" ng-src="../uploadimages/{{uploadedFile.FileName}}" />
                        </a>
                        <div class="media-body">
                            <div class="lead" style="font-size:14px;color: crimson;width:500px;word-wrap:break-word">{{uploadedFile.FilePath}}</div>
                        </div>
                    </div>
                </div>
                <div class="panel-footer">
                    图片总字节: <span style="color:black">{{uploadedFile.FileLength}}</span>
                </div>
            </div>
        </div>

    </div>
</div>

后台api服务:

    [RoutePrefix("api/upload")]
    public class FileUploadController : ApiController
    {
        [Route("")]
        [MimeMultipart]
        public async Task<FileUploadResult> Post()
        {
            var uploadPath = HttpRuntime.AppDomainAppPath + "UploadImages";
            if (!Directory.Exists(uploadPath))
                Directory.CreateDirectory(uploadPath);
            var multipartFormDataStreamProvider = new UploadMultipartFormProvider(uploadPath);
            await Request.Content.ReadAsMultipartAsync(multipartFormDataStreamProvider);

            string _localFileName = multipartFormDataStreamProvider
                .FileData.Select(multiPartData => multiPartData.LocalFileName).FirstOrDefault();

            return new FileUploadResult
            {
                LocalFilePath = _localFileName,

                FileName = Path.GetFileName(_localFileName),

                FileLength = new FileInfo(_localFileName).Length
            };
        }
    }

首先我们来看看例子搭建的结构:

生成界面效果:

 

下面我们来演示下最终效果:

 

总结

(1)在WebAPi中用到路由特性时,若在控制器中如  [RoutePrefix("api/upload")] 此时在方法中若未有  [Route("")] 此时在上传的url必须显示添加Post如: url: "/api/upload/post" 若添加则不用显示添加方法名。

(2)在angular中加载模板为

 <div ng-include src="''"></div> 【注】:src中要加单引号,否则出错
 
或者

 <div ng-include></div>

(3)对于在WebAPi中上传可以参看此链接,更加详细。

WebAPi:https://github.com/stewartm83/angular-fileupload-sample

对于AngularJS组件中的加载和上传还有更多用法,可以参看如下链接:

ng-file-upload:https://github.com/danialfarid/ng-file-upload

angular-loading-bar:https://github.com/chieffancypants/angular-loading-bar

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