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C# net部署图片分布式存储服务器的小案例

发布:2019/4/28 17:04:30作者:管理员 来源:本站 浏览次数:1694

C# net部署图片分布式存储服务器的小案例

如果web服务用户多了,访问多了,用户上传的图片,文件等内容放在一块,想必服务器是承受不住的,这个时候,我们就需要考虑分布式存储的方法了。

 

如图所示:一个web服务器拖2个图片服务器

如何做到用户上传的图片 比较均衡的存放到两个图片器上----简单的能想到 随机数

在这儿 ,咱们就基于随机数演示一下;

设计存储方案的数据库

要有一张表来存放图片服务器的信息,还有一张表用来存放图片的路径;

VS2013中创建的项目目录,大家看到创建了两个ImageService的一般处理程序,既然图片服务器要接收web服务器发送的图片请求,那么就要实现其程序,部署在2个图片服务器上的程序其实是一样的,这儿需要在一台电脑上演示两台图片服务器,所以创建了多个程序

 

首先Model层  使用EF,直接从数据库生成

 

2、图片服务器 处理程序在这儿使用一般处理程序ashx 

   首先添加对model 成的引用

   接着新建一般处理程序  FileUp.ashx,两个图片服务器是一样的

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namespace QAU.DFS.ImageService1
{
    /// <summary>
    /// FileUp 的摘要说明
    /// </summary>
    public class FileUp : IHttpHandler
    {
 
        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            int serverId = int.Parse(context.Request["serverId"]);
            string ext = context.Request["ext"];
            string dir = "/Image/" + DateTime.Now.Day + "/";
            Directory.CreateDirectory(Path.GetDirectoryName(context.Request.MapPath(dir)));
            string newFileName = Guid.NewGuid().ToString();
            string fullDir = dir + newFileName + ext;
            using (FileStream fileStream = File.OpenWrite(context.Request.MapPath(fullDir)))
            {
                context.Request.InputStream.CopyTo(fileStream);
                ImageInfo imageInfo = new ImageInfo();
                imageInfo.ImageName = fullDir;
                imageInfo.ImageServerId = serverId;
                ImageServerEntities db = new ImageServerEntities();
                db.ImageInfo.Add(imageInfo);
                db.SaveChanges();
 
            }
        }
 
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

3、新建web 项目 DFS.web,使用空的MVC4,  

新建Home 控制器  代码如下:

HomeController.cs

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public class HomeController : Controller
    {
        //
        // GET: /Home/
        ImageServerEntities db = new ImageServerEntities();
        public ActionResult Index()
        {
            return View();
        }
 
        public ActionResult FileUp()
        {
             
            HttpPostedFileBase file = Request.Files["fileUp"];
            string fileName = Path.GetFileName(file.FileName);
            string fileExt = Path.GetExtension(fileName);
            if (fileExt == ".png" ||fileExt== ".jpg")
            {
                //从服务器状态表筛选出可用的图片服务器集合记作C,并获取集合的总记录数N,然后用随机函数产生一个随机数R1,并用R1与N进行取余运算记作I=R1%N。 则C[I]即为要保存图片的图片服务器
                 
                List<ImageServerInfo> list = db.ImageServerInfo.Where(c => c.FlgUsable == true).ToList();
                int count = list.Count();
                Random random = new Random();
                int r = random.Next();
                int i = r % count;
                ImageServerInfo imageService = list[i];
                string url = imageService.ServerUrl;//图片服务器的地址
                int serverId = imageService.ServerId;//图片服务器编号
                string address = "http://"+url+"/FileUp.ashx?serverId="+serverId+"&ext="+fileExt;
 
                WebClient client = new WebClient();
                client.UploadData(address, StreamToByte(file.InputStream));
                 
            }
            return Content("ok");
             
        }
        private byte[] StreamToByte(Stream stream)
        {
            byte[] buffer = new byte[stream.Length];
            stream.Read(buffer, 0, buffer.Length);
            stream.Seek(0, SeekOrigin.Begin);
            return buffer;
        }
 
        public ActionResult ShowImage()
        {
            var imageServerInfo = db.ImageServerInfo.Where(c => c.FlgUsable == true).ToList();
            ViewData["imageServerList"] = imageServerInfo;
            return View();
        }
 
    }
}


4、上传页面 Index.cshtml

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<div>
        <form method="post" action="/Home/FileUp" enctype="multipart/form-data">
            <input type="file" name="fileUp" />
            <input type="submit" value="上传" />
        </form>
    </div>

5、显示上传的图片

ShowImage.cshtml

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<div>
        <h1>显示分布式服务器中 所有图片信息</h1>
        <ul>
            @foreach (ImageServerInfo imageService in (List<ImageServerInfo>)ViewData["imageServerList"])
            {
                foreach (var imageInfo in imageService.ImageInfo)
                {<li>
                    <img src="@string.Format("http://{0}{1}",imageService.ServerUrl,imageInfo.ImageName)" width="200" height="200" />
                </li>
                }
             
            }
        </ul>
    </div>

至此,完成,项目demo  下载地址 在下面:

      分布式图片存储小demo