如下图,下面是挪用的一个测试运用的界面。
测试上传和下载的功用。
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基础原理说一下:
1.客户端上传file,转换成二进制流到效劳器,效劳器吸收举行MD5加密,把文件及暗码存入文件效劳器库,文件依据MD5保留进当地文件夹,文件夹定名第一级取MD5前二位,第二级文件目次是MD5第3和4位,保留的文件重新定名,名称是当前加密的MD5。 固然,加密贮存须要考证的,假如当地已存了这个MD5就以为已保留了雷同的文件,就不须要再保留。
2.下载文件的时刻 直接经由过程该MD5取文件即可。
上图是基础流程,逻辑上照样有破绽,实际上又有修改。基础流程是如许了,能够也许看看,懒得再整齐个图了。
效劳端构造:
FileService.asmx 供应效劳,中心代码在FileCoreService.cs. 本项目用的Dapper,简朴轻易、有用。
WebApplication1 就是测试用的,客户端挪用的了。
WFBPMFile 能够疏忽了,我的一个转换功用,本来文件是文件流存入数据库里的,也许100G,然后转换成文件,放入文件效劳器了。
中心代码 放出来吧,喜好的能够拿去.
using FZ.File.Dapper; using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Diagnostics; using System.IO; using System.Security.Cryptography; using System.Text; namespace FZ.File.Logic { public class FileCoreService { /// <summary> /// 依据文件名和MD5搜检是不是存在, 搜检文件名和MD5都存在 /// </summary> /// <param name="filename">文件名</param> /// <param name="md5str">文件流加密的MD5</param> /// <returns></returns> public bool CheckFilNameMD5(string filename, string md5str) { using (IDbConnection conn = DBConfig.GetSqlConnection()) { try { string sql = "SELECT COUNT(*) FROM BPM_tb_UploadFile WHERE [FileName]=@FileName AND FileMD5=@FileMD5 "; //sql = String.Format(sql,filename,md5str); //var count = conn.ExecuteScalar(sql, null, null, null, CommandType.Text); var param = new DynamicParameters(); param.Add("@FileName", filename); param.Add("@FileMD5", md5str); var count = conn.ExecuteScalar(sql, param, null, 3600, CommandType.Text); if ((int)count > 0) { return true; } } catch (Exception ex) { throw ex; } } return false; } /// <summary> /// 考证数据的完整性(吸收到的文件流MD5与吸收到的MD5考证) /// </summary> /// <param name="md5str">吸收的MD5</param> /// <param name="sourceStream">文件流</param> /// <returns></returns> public bool CheckMD5(string md5str, System.Byte[] sourceStream) { var jmd5 = GetMD5HashByByte(sourceStream); if (md5str == jmd5) { return true; } return false; } public bool InsertFile(System.Byte[] sourceStream,string md5str,string filename) { bool sf = SaveFileToDisk(sourceStream, "D:\\UploadFile\\", md5str); //先保留文件 if (sf) { //TO DO 插进去数据库 using (IDbConnection conn = DBConfig.GetSqlConnection()) { try { string sql = "INSERT INTO BPM_tb_UploadFile([FileName],[FileMD5],[FileSize],[Description]) VALUES('{0}','{1}',{2},'{3}')"; sql = String.Format(sql, filename, md5str, sourceStream.Length, ""); var count = conn.Execute(sql, null, null, null, CommandType.Text); //var param = new DynamicParameters(); //param.Add("@FileName", filename); //param.Add("@FileMD5", md5str); //var count = conn.Execute(sql, param, null, 3600, CommandType.Text); if (count > 0) { return true; } } catch (Exception ex) { throw ex; } } } return false; } // 依据二进制流生成MD5 private string GetMD5HashByByte(System.Byte[] sourceStream) { MD5 md5 = new MD5CryptoServiceProvider(); byte[] result = md5.ComputeHash(sourceStream); String ret = ""; for (int i = 0; i < result.Length; i++) ret += result[i].ToString("x").PadLeft(2, '0'); return ret; } // 依据文件流生成MD5(与上一要领生成效果雷同) private string GetMD5HashByFile(string fileName) { FileStream file = new FileStream(fileName, FileMode.Open); MD5 md5 = new MD5CryptoServiceProvider(); byte[] result = md5.ComputeHash(file); file.Close(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < result.Length; i++) { sb.Append(result[i].ToString("x2")); } return sb.ToString(); } // 保留文件流到效劳器上指定位置 private bool SaveFileToDisk(System.Byte[] sourceStream, string fileFullName) { bool result = false; try { //待保留的途径 string savePath = Path.GetDirectoryName(fileFullName); if (!Directory.Exists(savePath)) { Directory.CreateDirectory(savePath); } using (FileStream fsTarget = new FileStream(fileFullName, FileMode.Create, FileAccess.Write, FileShare.None)) { fsTarget.Write(sourceStream, 0, sourceStream.Length); fsTarget.Flush(); fsTarget.Close(); result = true; } } finally { } return result; } private bool SaveFileToDisk(System.Byte[] sourceStream, string filepath,string md5) { bool result = false; string fileFullName = filepath + md5.Substring(0, 2) + "\\" + md5.Substring(2, 2)+"\\" + md5; try { //待保留的途径 string savePath = Path.GetDirectoryName(fileFullName); if (!Directory.Exists(savePath)) { Directory.CreateDirectory(savePath); } using (FileStream fsTarget = new FileStream(fileFullName, FileMode.Create, FileAccess.Write, FileShare.None)) { fsTarget.Write(sourceStream, 0, sourceStream.Length); fsTarget.Flush(); fsTarget.Close(); result = true; } } finally { } return result; } public System.Byte[] ReadFileByte(string filename, string md5str) { var filepath = "D:\\UploadFile\\" + md5str.Substring(0, 2) + "\\" + md5str.Substring(2, 2) + "\\" + md5str; FileStream fileStream = new FileStream(filepath, FileMode.Open); byte[] bytes = new byte[fileStream.Length]; fileStream.Read(bytes, 0, bytes.Length); fileStream.Close(); return bytes; } public FileStream ReadFileStream(string filename, string md5str) { var filepath = "D:\\UploadFile\\" + md5str.Substring(0, 2) + "\\" + md5str.Substring(2, 2) + "\\" + md5str; FileStream fileStream = new FileStream(filepath, FileMode.Open); fileStream.Close(); return fileStream; } } }
上面保留的文件途径本身写入配置文件吧,另有日记文件途径,本身到配置文件改一下。代码写的很烂,列位高人疏忽即可。
供应的效劳代码:
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; using FZ.File.Logic; using System.IO; namespace BPMFileService { /// <summary> /// FileService 的择要申明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // 若要许可运用 ASP.NET AJAX 从剧本中挪用此 Web 效劳,请作废解释以下行。 // [System.Web.Script.Services.ScriptService] public class FileService : System.Web.Services.WebService { [WebMethod] public bool CheckMD5(string filename,string md5str) { FileCoreService fs = new FileCoreService(); return fs.CheckFilNameMD5(filename, md5str); } [WebMethod] public bool InsertFile(System.Byte[] FileStream,string filename, string md5str) { FileCoreService fs = new FileCoreService(); bool b = fs.CheckMD5(md5str, FileStream); //考证MD5 if (b) { b = fs.InsertFile(FileStream, md5str,filename); //保留文件,并更新到数据库 if (b) { LocalLog.Write("插进去文件胜利,文件名:" + filename + " MD5:" + md5str); } else { LocalLog.Write("插进去文件失利,文件名:" + filename + " MD5:" + md5str); } } else { LocalLog.Write("吸收的文件不完整,请搜检!文件名:" + filename + " MD5:" + md5str); } return b; } [WebMethod] public Byte[] ReadFile(string filename, string md5str) { FileCoreService fs = new FileCoreService(); Byte[] bytes = fs.ReadFileByte(filename, md5str); LocalLog.Write("读取文件 NAME:" + filename + " MD5:" + md5str); return bytes; } } }
客户端上传挪用的代码:
protected void btnUp_Click(object sender, EventArgs e) { FileServiceSoapClient fsclient = new FileServiceSoapClient(); byte[] fb = FileUpload1.FileBytes; System.IO.Stream s = FileUpload1.PostedFile.InputStream; var md5str = GetMD5HashByByte(fb); var md5str2 = GetMD5HashByFile(s); var filename = FileUpload1.FileName; bool b = fsclient.CheckMD5(filename, md5str); if (!b) { if (md5str == md5str2) { b = fsclient.InsertFile(fb, filename, md5str); } } }
客户端下载的代码:
protected void btndown_Click(object sender, EventArgs e) { FileServiceSoapClient fsclinent = new FileServiceSoapClient(); var Dbytes = fsclinent.ReadFile("新建文本文档.txt", "450ccb8dc556e010ff95b787084d2c51"); //byte[] bytes =byte.Parse(Dbytes.ToString()): Response.ContentType = "application/octet-stream;charset=gb2321"; //关照浏览器下载文件而不是翻开;对中文名称举行编码 Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("新建文本文档.txt", System.Text.Encoding.UTF8)); Response.BinaryWrite(Dbytes); Response.Flush(); Response.End(); }
数据库也比较简朴:
日记:
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