首页 > 代码库 > Windows Azure 系列-- 使用Azure + Web API实现图片上传
Windows Azure 系列-- 使用Azure + Web API实现图片上传
1. 创建1个Azure账号,登录之后创建1个AzureStorage。左下方点Manage Access会看到Primary Access Key和Storage Account,记住它们的位置,等下须要配置到Web.config中。
2. 创建Web.Api project,上传图片的代码:
[HttpPost] public async Task<HttpResponseMessage> PostFile() { HttpRequestMessage request = Request; if (!request.Content.IsMimeMultipartContent()) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } string root = System.Web.HttpContext.Current.Server.MapPath("~/App_Data/uploads"); var provider = new MultipartFormDataStreamProvider(root); var task = await request.Content.ReadAsMultipartAsync(provider); string accountName = "your account stro"; string accountKey = "your key"; var creds = new StorageCredentials(accountName, accountKey); var account = new CloudStorageAccount(creds, useHttps: true); CloudBlobClient client = account.CreateCloudBlobClient(); CloudBlobContainer sampleContainer = client.GetContainerReference("samples"); sampleContainer.CreateIfNotExists(); sampleContainer.SetPermissions(new BlobContainerPermissions() { PublicAccess = BlobContainerPublicAccessType.Blob }); foreach (MultipartFileData file in provider.FileData) { var name = file.Headers.ContentDisposition.FileName.Replace("\"",""); CloudBlockBlob blob = sampleContainer.GetBlockBlobReference(name); using (var filestream = File.OpenRead(file.LocalFileName)) { blob.UploadFromStream(filestream); } } return Request.CreateResponse(HttpStatusCode.OK); } [HttpGet] public IEnumerable<string> AzureImageUrls() { HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*"); var connStr = ConfigurationManager.AppSettings["AzureImageStorage"]; var accnt = CloudStorageAccount.Parse(connStr); var client = accnt.CreateCloudBlobClient(); var blobs = client.GetContainerReference("samples" /*container name*/).ListBlobs(); var urls = blobs.Select(blob => blob.Uri.AbsoluteUri).ToList(); return urls; }
包括了两个Action,PostFile和AzureImageUrls,前者用来接收post过来的文件对象,后者用于从Azure中获取uri返回到客户端。
首先,在上传时,须要设置这行代码:
PublicAccess = BlobContainerPublicAccessType.Blob假设不设置的话,默认的訪问权限是不能够在客户端直接訪问Blob图片的。因而显示不出图片。
其次,在客户端获取URI时,API中须要设置这行代码:
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
由于跨域做AJAX默认是不同意的,这行代码的实现方式为CORS(Cross Origin Resource sharing),另外还有JSONP能够做到,可是须要server端返回js函数的调用代码,有关跨域AJAX请求,详细能够參见这篇不错的文章:
https://jvaneyck.wordpress.com/2014/01/07/cross-domain-requests-in-javascript/
<appSettings> <add key="AzureImageStorage" value="http://www.mamicode.com/DefaultEndpointsProtocol=http;AccountName=name;AccountKey=yourkey" /> </appSettings>须要注意的地方就是。value中不同意出现空格。这个链接字符串是标准形式,很多其它azure链接字符串,能够參照:
https://www.connectionstrings.com/windows-azure/
4. 推荐下载cloud berry这样的相似FTP的管理工具。方便查看上传的图片,假设传错了能够进行删除:
http://www.cloudberrylab.com
5. 客户端html实现:
<html> <script src="http://www.mamicode.com/jquery-2.1.1.js"></script> <form method="post" enctype="multipart/form-data" action="http://localhost:55006/api/values/postfile"> <input type="file" name ="uploadfile" ></input> <input type="submit" value="http://www.mamicode.com/submit" ></input> <ul class="imgs"> </ul> </form> <script> $(document).ready(function(){ $.get("http://localhost:55006/api/values/AzureImageUrls", function(data, status){ var html = ""; for(var i = 0;i < data.length; i++){ var d = data[i]; html += "<img src=http://www.mamicode.com/‘" + d + "‘ width=‘300px‘ height=‘300px‘/>"; } $(".imgs").html(html); }); }); </script> </html>
Windows Azure 系列-- 使用Azure + Web API实现图片上传
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