.NET使用DFS分布式文件存储系统

来源：互联网发布：mac os x 10.9 编辑：程序博客网时间：2024/05/22 13:33

带来混沌的是无知而不是知识

FileInfo.cs实体类

 public class FileInfo    {        public string Name { get; set; }        public int ServerID { get; set; }    }

ServerInfo.cs实体类

public class ServerInfo    {        public int ServerID { get; set; }        public string ServerIP { get; set; }        public bool Status { get; set; }    }

DFSEntities.cs数据库上下文

public class DFSEntities:DbContext    {        protected override void OnModelCreating(DbModelBuilder modelBuilder)        {            modelBuilder.Entity<FileInfo>().ToTable("FileInfo")                .HasKey(m => m.Name);            modelBuilder.Entity<ServerInfo>().ToTable("ServerInfo")                .HasKey(m => m.ServerID);            base.OnModelCreating(modelBuilder);        }        public virtual DbSet<FileInfo> FileInfo { get; set; }        public virtual DbSet<ServerInfo> ServerInfo { get; set; }    }

Index.aspx内容

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title></head><body>     <form id="form1" runat="server" method="post" action="FileUpload.ashx"  enctype="multipart/form-data">    <div>            <asp:FileUpload ID="FileUpload1"  runat="server" />        <input type="submit" value="Submit" />    </div>    </form></body></html>

FileUpload.ashx代码

 public class FileUpload : IHttpHandler    {        public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/plain";            var file = context.Request.Files["FileUpload1"];            if(file != null)            {                using(DFSEntities dfs = new DFSEntities())                {                    //从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r并用r与n进行取余运算记作i=r%n。                    //则c[i]即为要保存图片的服务器                    var serverList = dfs.ServerInfo.Where(s => s.Status).ToList();                    int n = serverList.Count;                    int r = new Random().Next();                    int i = r % n;                    ServerInfo server = serverList[i];                    string address = string.Format("http://{0}/SaveFile.ashx",server.ServerIP);                    HttpClient client = new HttpClient();                    var content = new MultipartFormDataContent();                    string fileName = Guid.NewGuid() + Path.GetExtension(file.FileName);                    content.Add(new StreamContent(file.InputStream), "file", fileName);                    content.Add(new StringContent(server.ServerID.ToString()), "serverID");                    var hrm = client.PostAsync(address, content).Result;                    context.Response.Write(hrm.Content.ReadAsStringAsync().Result);                    return;                }            }            context.Response.Write("{status:0,notice:\"未找到key=file的文件。\"}");        }        public bool IsReusable        {            get { return false; }        }    }

SaveFile.ashx代码:

  /// <summary>    /// SaveFile 的摘要说明    /// </summary>    public class SaveFile : IHttpHandler    {        static readonly string ServerIP = ConfigurationManager.AppSettings["ServerIP"];        public void ProcessRequest(HttpContext context)        {            context.Response.ContentType = "text/plain";            var file = context.Request.Files["file"];            string sid = context.Request.Form["serverID"];            int serverID = 0;            if(int.TryParse(sid, out serverID) && file != null)            {                DateTime now = DateTime.Now;                string dir =String.Format("/Files/{0}/{1}/{2}/{3}/",now.Year,now.Month,now.Day,now.Hour);                string absPath = context.Server.MapPath(dir);                if(!Directory.Exists(absPath))                    Directory.CreateDirectory(absPath);                string guid = Guid.NewGuid().ToString();                string name = guid + Path.GetExtension(file.FileName);                string fullPath = String.Format("{0}\\{1}",absPath,name);                string returnUrl = ServerIP + dir + name;                file.SaveAs(fullPath);                using(DFSEntities dfs = new DFSEntities())                {                    dfs.FileInfo.Add(new EntityFramework.FileInfo                    {                        Name = returnUrl,                        ServerID = serverID                    });                    if(dfs.SaveChanges() > 0)                    {                        context.Response.Write(String.Format("{{status:1,notice:\"上传成功\",data:\"{0}\"}}", returnUrl));                        return;                    }                }                context.Response.Write("{status:0,notice:\"上传失败\"}");                return;            }            context.Response.Write("{status:0,notice:\"上传失败\"}");        }        public bool IsReusable        {            get { return false; }        }    }

sql脚本:

SET ANSI_NULLS ONGOSET QUOTED_IDENTIFIER ONGOSET ANSI_PADDING ONGOCREATE TABLE [dbo].[ServerInfo](    [ServerID] [int] IDENTITY(1,1) NOT NULL,    [ServerIP] [varchar](50) NOT NULL,    [Status] [bit] NOT NULL, CONSTRAINT [PK_ServerInfo] PRIMARY KEY CLUSTERED (    [ServerID] ASC)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]) ON [PRIMARY]GOSET ANSI_PADDING OFFGOSET IDENTITY_INSERT [dbo].[ServerInfo] ON INSERT [dbo].[ServerInfo] ([ServerID], [ServerIP], [Status]) VALUES (1, N'192.168.191.1', 0)INSERT [dbo].[ServerInfo] ([ServerID], [ServerIP], [Status]) VALUES (2, N'localhost:55424', 1)SET IDENTITY_INSERT [dbo].[ServerInfo] OFFUSE [master]GOALTER DATABASE [SAMPLEDB] SET  READ_WRITE GO

运行结果如图:

这里写图片描述

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