AngularJS向后端ASP.NET API控制器上传文件

前端技术 2023/09/08 JavaScript

本文实例介绍了前端AngularJS向后端ASP.NET Web API上传文件的实现方法，具体内容如下

首先服务端： 

public class FilesController : ApiController
{
  //using System.Web.Http
  [HttpPost]
  public async Task<HttpResponseMessage> Upload()
  {
    if(!Request.Content.IsMimeMultipartContent())
    {
      this.Request.CreateResponse(HttpStatusCode.UnsuportedMediaType);
    }
    
    var provider = GetMultipartProvider();
    var result = await Request.Content.ReadAsMultipartAsync(provider);
    
    //文件名类似\"BodyPart_26d6abe1-3ae1-416a-9429-b35f15e6e5d5\"这样的格式
    var originalFileName = GetDeserializedFileName(result.FileData.First());
    
    var uploadFileInfo = new FileInfo(result.FileData.First().LocalFileName);
    
    //如果前端无表单数据，这里注销
    var filleUploadObj = GetFormData<UploadDataModel>(result);
    
    var returnData = \"ReturnTest\";
    return this.Request.CreateResponse(HttpStatusCode.OK, new {returnData});
  }
  
  private MultipartFormDataStreamProvider GetMultipartProvider()
  {
    //图片的上传路径
    var uploadFolder = \"~/App_Data/FileUploads\";
    
    //获取根路径
    var root = HttpContext.Current.Server.MapPath(uploadFolder);
    
    //创建文件夹
    Directory.CreateDirectory(root);
    return new MultipartFormDataStreamProvider(root);
  }
  
  //从Provider中获取表单数据
  private object GetFormData<T>(MultipartFormDataStreamProvider result)
  {
    if(result.FormData.HasKeys())
    {
      var unescapedFormData = Uri.UnescapeDataString(result.FormData.GetValues(0).FirstOrDefault() ?? String.Empty);
      
      if(!String.IsNullOrEmpty(unescapedFormData))
      {
        return JsonConvert.DeserializeObject<T>(upescapedFormData);
      }
    }
    return null;
  }
  
  //获取反序列化文件名
  private string GetDeserializedFileName(MultipartFileData fileData)
  {
    var fileName = GetFileName(fileData);
    return JsonConvert.DeserializedObject(fileName).ToString();
  }
  
  //获取文件名
  public string GetFileName(MultipartFileData fileData)
  {
    return fileData.Headers.ContentDisposition.FileName;
  }
}

UploadDataModel.cs

public class UploadDataModel
{
  public string testString1{get;set;}
  public string testString2{get;set;}
}

客户端主页面：

index.html

<div ng-include=\"\'upload.html\'\"></div>

引用：

  • angular-file-upload-shim.js
  • angular.js
  • angular-file-upload.js
  • angular-cookies.js
  • angular-resource.js
  • angular-sanitize.js
  • angular-route.js
  • app.js
  • upload.js

upload.html部分视图页用来接受文件。

upload.html

<div ng-controller=\"UploadCtrl\"
  <input type=\"file\" ng-file-select=\"onFileSelect($files)\" multiple>
</div>

app.js模块依赖和全局配置。

app.js

\'use strict\'

angular.module(\'angularUploadApp\',[
  \'ngCookies\',
  \'ngResource\',
  \'ngSanitize\',
  \'ngRoute\',
  \'angularFileUpload\'
])
.config(function($routeProvider){
  $routeProvider
    .when(\'/\', {
      templateUrl: \'upload.html\',
      controller: \'UploadCtrl\'
    })
    .otherwise({
      resirectTo: \'/\'
    })
})

控制器提供上传和取消上传的方法。

upload.js

\'use strict\';

angular.module(\'angularUploadApp\')
  .controller(\'UploadCtrl\', function($scope, $http, $timeout, $upload){
    $scope.upload = [];
    $scope.fileUploadObj = {testString1: \"Test ring 1\", testString2: \"Test string 2\"};
    
    $scope.onFileSelect = function ($files) {
      //$files: an array of files selected, each file has name, size, and type.
      for (var i = 0; i < $files.length; i++) {
        var $file = $files[i];
        (function (index) {
          $scope.upload[index] = $upload.upload({
            url: \"./api/files/upload\", // webapi url
            method: \"POST\",
            data: { fileUploadObj: $scope.fileUploadObj },
            file: $file
          }).progress(function (evt) {
            // get upload percentage
            console.log(\'percent: \' + parseInt(100.0 * evt.loaded / evt.total));
          }).success(function (data, status, headers, config) {
            // file is uploaded successfully
            console.log(data);
          }).error(function (data, status, headers, config) {
            // file failed to upload
            console.log(data);
          });
        })(i);
      }
    }

    $scope.abortUpload = function (index) {
      $scope.upload[index].abort();
    }
  })

以上就是前端AngularJS向后端ASP.NET Web API上传文件的实现方法，希望对大家的学习有所帮助。

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