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[SDK2.2]Windows Azure Storage (15) 使用WCF服务,将本地图片上传至Azure Storage (上) 服务器端代码

2013-10-31 13:37 816 查看
  Windows Azure Platform 系列文章目录

  这几天工作上的内容,把项目文件和源代码拿出来给大家分享下。

  源代码下载:Part1    Part2    Part3

  我们在写WEB服务的时候,经常需要把本地的文件上传至服务器端进行保存,类似于上传附件的功能。

  在本章中,我们将新建WCF服务并上传至Azure云端,实现把本地的图片通过WCF保存至Azure Storage。

  本章需要掌握的技术点:

  1.WCF服务

  2.Azure Storage

  本章将首先介绍服务器端程序代码。

  1.首先我们用管理员身份,运行VS2013。

  2.新建Windows Azure Cloud Project,并命名为LeiAzureService

  


  3.添加"WCF Service Web Role",并重命名为LeiWCFService。

  


  4.打开IE浏览器,登录http://manage.windowsazure.com,在Storage栏,新建storage name为leiwcfstorage

  



  5.我们回到VS2013,选择Project LeiAzureService,展开Roles->LeiWCFService,右键属性

  


  6.在弹出的窗口里,Configuration栏,将Instance count设置成2VM Size选择Small

  


  这样,就同时有2台 [b]small size(1core/1.75GB)[/b]的Cloud Service自动做负载均衡了。

  7.在Settings栏,选择Add Setting,设置Name为StorageConnectionString,Type选择Connection String,然后点击Value栏的按钮

  在Create Storage Connection String中,选择Account Name为我们在步骤4中创建的leiwcfstorage

  


  8.再次点击Add Setting,设置Name为ContainerName,Type选择String,Value设置为photos。切记Value的值必须是小写

  



  9.在Project LeiWCFService中,修改IService1.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;

namespace LeiWCFService
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
[ServiceContract]
public interface IService1
{
[OperationContract]
[WebInvoke(Method = "POST", UriTemplate = "/UploadPic", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
string UploadPic(Stream ImageStream);

}
}


  

  10.修改Service1.svc

  这个类的主要功能是读取Azure配置文件cscfg的节点信息,并根据storage connection string,创建Container,并将本地的图片文件名重命名为GUID,并保存至Container

  项目中需要添加相关的引用,笔者就不详述了。

using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.ServiceModel.Web;
using System.Text;

namespace LeiWCFService
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
// NOTE: In order to launch WCF Test Client for testing this service, please select Service1.svc or Service1.svc.cs at the Solution Explorer and start debugging.
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Service1 : IService1
{
public string UploadPic(Stream ImageStream)
{
try
{
//获取ServiceConfiguration.cscfg配置文件的信息
var account = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));

var client = account.CreateCloudBlobClient();

//获得BlobContainer对象
CloudBlobContainer blobContainer
= client.GetContainerReference(CloudConfigurationManager.GetSetting("ContainerName"));

if (!blobContainer.Exists())
{
// 检查container是否被创建,如果没有,创建container

blobContainer.CreateIfNotExists();
var permissions = blobContainer.GetPermissions();

//对Storage的访问权限是可以浏览Container
permissions.PublicAccess = BlobContainerPublicAccessType.Container;
blobContainer.SetPermissions(permissions);
}

Guid guid = Guid.NewGuid();
CloudBlockBlob blob = blobContainer.GetBlockBlobReference(guid.ToString() + ".jpg");
blob.Properties.ContentType = "image/jpeg";
//request.Content.Headers.ContentType.MediaType

//blob.UploadFromByteArray(content, 0, content.Length);
blob.UploadFromStream(ImageStream);
blob.SetProperties();

return guid.ToString();
}
catch (Exception ex)
{
return ex.InnerException.ToString();
}
}
}
}


  以上代码和配置,实现了以下功能点:

  1.在Windows Azure Storage里创建名为photos的Container,并且设置Storage的访问权限

  2.设置上传的BlockbName为GUID

  3.通过UploadFromStream,将客户端POST的Stream保存到Azure Storage里

  11.修改Web.config的 <system.serviceModel>节点。设置WCF的相关配置。

<system.serviceModel>
<bindings>
<!--<webHttpBinding></webHttpBinding>-->
<webHttpBinding>
<binding name="WCFServiceBinding"
maxReceivedMessageSize="10485760"
maxBufferSize="10485760"
closeTimeout="00:01:00" openTimeout="00:01:00"
receiveTimeout="00:10:00" sendTimeout="00:01:00">
<security mode="None"/>
</binding>
</webHttpBinding>
</bindings>
<services>
<service name="LeiWCFService.Service1" behaviorConfiguration="ServiceBehaviour">
<endpoint address="" binding="webHttpBinding" behaviorConfiguration="web" contract="LeiWCFService.IService1"></endpoint>
</service>
</services>
<behaviors>
<endpointBehaviors>
<behavior name="web">
<webHttp helpEnabled="true" />
</behavior>
</endpointBehaviors>
<serviceBehaviors>
<behavior name="ServiceBehaviour">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
<behavior name="">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="false" />
</behavior>
</serviceBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>


  

  

  12.在VS2013离,点击Save All,并将项目发布至Windows Azure。

  DNS我们设置为LeiAzureService

  13.等待项目发布结束后,在IE浏览器中输入http://leiazureservice.cloudapp.net/service1.svc/help看到如下的图片,就证明发布成功了

  


  
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