C#实现分片上传文件

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Web;
  5 using System.IO;
  6 using System.Configuration;
  7 
  8 namespace WebApplication1
  9 {
 10     /// <summary>
 11     /// PartialFileSet 的摘要说明
 12     /// </summary>
 13     public class UpLoadPartialFile : IHttpHandler
 14     {
 15         public static DateTime mkdirRecodeTime = DateTime.Now.AddDays(-2);
 16         public static string keyHead = DateTime.Now.Year + "" + DateTime.Now.Month + DateTime.Now.Day;
 17         public static string path = ConfigurationManager.AppSettings["filePath"].ToString();
 18         public static object mkdirLock = new object();
 19    
 20         /// <summary>
 21         /// 根据日期字符串返回路径
 22         /// </summary>
 23         /// <param name="keyHead">日期字符串yyyyMMdd</param>
 24         /// <returns></returns>
 25         private static string getCurrentPathByDate(string keyHead)
 26         {
 27 
 28             return path + "\" + keyHead;
 29         }
 30 
 31         private static string getCurrentFilePathByDate(string keyHead, string guid, int id)
 32         {
 33             return getCurrentPathByDate(keyHead) + "\" + guid + id;
 34         }
 35 
 36         private static string getNewFilePathByDate(string keyHead, string guid)
 37         {
 38             string fileType = HttpContext.Current.Request["fileType"];
 39             if(fileType!=null&& fileType.Length>0)
 40             return getCurrentPathByDate(keyHead) + "\" + guid+"."+fileType;
 41             return getCurrentPathByDate(keyHead) + "\" + guid;
 42         }
 43         /// <summary>
 44         /// 如果目标文件夹不存在 创建文件夹
 45         /// </summary>
 46         /// <param name="keyHead"></param>
 47         private static void mkdirIfNoExit()
 48         {
 49 
 50             if ((DateTime.Now-mkdirRecodeTime ).Days < 1)
 51                 return;
 52           
 53             //创建文件夹目录
 54             if (Directory.Exists(getCurrentPathByDate(keyHead)))
 55                 return;
 56             lock (mkdirLock)
 57             {
 58 
 59                 if (!Directory.Exists(path))
 60                     Directory.CreateDirectory(path);
 61                 if (!Directory.Exists(getCurrentPathByDate(keyHead)))
 62                     Directory.CreateDirectory(getCurrentPathByDate(keyHead));
 63 
 64                 keyHead = DateTime.Now.Year + "" + DateTime.Now.Month + DateTime.Now.Day;
 65                 mkdirRecodeTime = DateTime.Now;
 66                 return;
 67             }
 68 
 69         }
 70 
 71         private void uploadFile(HttpContext context)
 72         {
 73             try
 74             {
 75                 //检查目录
 76                 mkdirIfNoExit();
 77                 
 78 
 79 
 80                 if (context.Request.Files == null || context.Request.Files.Count == 0 || context.Request.Files[0].InputStream.Length == 0)
 81                 {
 82                     context.Response.Write("{"state":"error","code":-6,"msg":"接口调用出错 上传文件不能为空"}");
 83                     return;
 84                 }
 85                 if (context.Request.Files.Count > 1)
 86                 {
 87                     context.Response.Write("{"state":"error","code":-7,"msg":"接口调用出错 每次只能上传单个文件"}");
 88                     return;
 89                 }
 90                 string guid = Guid.NewGuid().ToString();
 91 
 92                 string keyHead = DateTime.Now.Year + "" + DateTime.Now.Month + DateTime.Now.Day;
 93                 string currentPath = getCurrentPathByDate(keyHead);
 94                 string filePath = getNewFilePathByDate(keyHead, guid);
 95               
 96                 lock (filePath)
 97                 {
 98                     //创建文件
 99                     try
100                     {
101                         context.Request.Files[0].SaveAs(filePath);
102 
103                     }
104                     catch (Exception e)
105                     {
106                         Util.LogHelper.Info(e.Message + e.StackTrace);
107 
108                         context.Response.Write("{"state":"error","code":-2,"msg":"接口调用出错 guid为" + guid + "的文件写入时出现错误 已记录日志"}");
109                         return;
110                     }
111                 }
112                 context.Response.Write("{"state":"success","code":0,"msg":""+keyHead+guid+""}");
113 
114             }
115             catch (Exception e)
116             {
117                 Util.LogHelper.Info(e.Message + e.StackTrace);
118                 context.Response.Write("{"state":"error","code":-1,"msg":"接口调用出错 已记录日志"}");
119             }
120         }
121 
122         private void uploadPartialFile(HttpContext context) {
123             try
124             {
125                 //检查目录
126                 mkdirIfNoExit();
127                 if (context.Request["date"] == null)
128                 {
129                     context.Response.Write("{"state":"error","code":-2,"msg":"接口调用出错 参数date(第一片上传时间)不能为空"}");
130                     return;
131                 }
132                 DateTime uploadData;
133                 if (!DateTime.TryParse(context.Request["date"], out uploadData))
134                 {
135 
136                     context.Response.Write("{"state":"error","code":-2,"msg":"接口调用出错date参数错误 格式 yyyy-MM-dd"}");
137                     return;
138                 }
139                 if (context.Request["guid"] == null || context.Request["guid"].Trim().Length != 32)
140                 {
141                     context.Response.Write("{"state":"error","code":-3,"msg":"接口调用出错 guid(文件唯一标示)不能为空且必须为32位长度"}");
142                     return;
143                 }
144 
145                 if (context.Request["id"] == null || context.Request["id"].Trim().Length == 0)
146                 {
147                     context.Response.Write("{"state":"error","code":-4,"msg":"接口调用出错 id(文件分组id)不能为空"}");
148                     return;
149                 }
150                 int id = -1;
151                 if (!int.TryParse(context.Request["id"], out id))
152                 {
153                     context.Response.Write("{"state":"error","code":-5,"msg":"接口调用出错 id(文件分组id)必须为数字"}");
154                     return;
155                 }
156 
157 
158                 if (context.Request.Files == null || context.Request.Files.Count == 0 || context.Request.Files[0].InputStream.Length == 0)
159                 {
160                     context.Response.Write("{"state":"error","code":-6,"msg":"接口调用出错 上传文件不能为空"}");
161                     return;
162                 }
163                 if (context.Request.Files.Count > 1)
164                 {
165                     context.Response.Write("{"state":"error","code":-7,"msg":"接口调用出错 每次只能上传单个文件"}");
166                     return;
167                 }
168                 string guid = context.Request["guid"].Trim();
169                 string keyHead = uploadData.Year + "" + uploadData.Month + uploadData.Day;
170                 string currentPath = getCurrentPathByDate(keyHead);
171                 string filePath = getCurrentFilePathByDate(keyHead, guid, id);
172                 if (File.Exists(filePath))
173                 {
174                     context.Response.Write("{"state":"error","code":-8,"msg":"接口调用出错 guid为" + guid + "文件id为" + id + "的文件已存在"}");
175                     return;
176                 }
177                 lock (filePath)
178                 {
179                     if (File.Exists(filePath))
180                     {
181                         context.Response.Write("{"state":"error","code":-8,"msg":" guid为" + guid + "文件id为" + id + "的文件已存在"}");
182                         return;
183                     }
184                     //创建文件
185                     try
186                     {
187                         context.Request.Files[0].SaveAs(filePath);
188 
189                     }
190                     catch (Exception e)
191                     {
192                         Util.LogHelper.Info(e.Message + e.StackTrace);
193 
194                         context.Response.Write("{"state":"error","code":-9,"msg":"接口调用出错 guid为" + guid + "文件id为" + id + "的文件写入时出现错误 已记录日志"}");
195                         return;
196                     }
197                 }
198 
199                 context.Response.Write("{"state":"success","code":0,"msg":" guid为" + guid + "文件id为" + id + "的文件写入成功"}");
200 
201             }
202             catch (Exception e)
203             {
204                 Util.LogHelper.Info(e.Message + e.StackTrace);
205                 context.Response.Write("{"state":"error","code":-1,"msg":"接口调用出错 已记录日志"}");
206             }
207         }
208 
209         private void joinfile(HttpContext context)
210         {
211             try
212             {
213                 //检查目录
214                 if (context.Request["date"] == null)
215                 {
216                     context.Response.Write("{"state":"error","code":-2,"msg":"接口调用出错 参数date(第一片上传时间)不能为空"}");
217                     return;
218                 }
219                 if (context.Request["guid"] == null || context.Request["guid"].Trim().Length != 32)
220                 {
221                     context.Response.Write("{"state":"error","code":-3,"msg":"接口调用出错 guid(文件唯一标示)不能为空且必须为32位长度"}");
222                     return;
223                 }
224 
225                 if (context.Request["idArray"] == null || context.Request["idArray"].Trim().Length == 0)
226                 {
227                     context.Response.Write("{"state":"error","code":-4,"msg":"接口调用出错 id(文件分组id列表)不能为空"}");
228                     return;
229                 }
230                 DateTime uploadData;
231                 if (!DateTime.TryParse(context.Request["date"],out uploadData)) {
232 
233                     context.Response.Write("{"state":"error","code":-6,"msg":"接口调用出错date参数错误 格式 yyyy-MM-dd"}");
234                     return;
235                 }
236 
237                 string keyHead = uploadData.Year + "" + uploadData.Month + uploadData.Day;
238                 string guid = context.Request["guid"].Trim();
239 
240                 List<int> IdArray = context.Request["idArray"].StringArrayConvertInt(',').OrderBy(u=>u).ToList();
241                 //开始检查文件是否全部存在
242                 List<string> pathList = new List<string>();
243                 if (IdArray.Count < 1)
244                 {
245                     context.Response.Write("{"state":"error","code":-8,"msg":"接口调用出错文件列表文件少于2个无法进行合并操作 请检查IdArray参数"}");
246                     return;
247                 }
248                 foreach (var item in IdArray)
249                 {
250                     string path = getCurrentFilePathByDate(keyHead,guid,item);
251                     if (!File.Exists(path))
252                     {
253                         context.Response.Write("{"state":"error","code":-7,"msg":"id编号为"+item+"的文件在服务器上不存在 请检查"}");
254                         return;
255                     }
256                     pathList.Add(path);
257 
258                 }
259                 string newGuid = Guid.NewGuid().ToString();
260                 string newFilePath = getNewFilePathByDate(keyHead,newGuid);
261                 using (System.IO.FileStream fileStram = File.Open(newFilePath, FileMode.Create,FileAccess.Write))
262                 {
263 
264                     //开始合并文件  创建一个副本
265                     pathList.ForEach(u =>
266                 {
267                     //读取文件
268                     using (FileStream save = new FileStream(u, FileMode.Open, FileAccess.Read))
269                     {
270                         byte[] bt = new byte[1024];
271                         int count = -1;
272                         while ((count = save.Read(bt, 0, bt.Length)) > 0)
273                         {
274                             fileStram.Write(bt, 0, count);
275                         }
276                     }
277 
278                 });
279                     context.Response.Write("{"state":"success","code":0,"msg":""+ keyHead + newGuid + ""}");
280                     //删除文件列表
281                     delFile(pathList);
282                 }
283 
284             }
285             catch (Exception e)
286             {
287                 Util.LogHelper.Info(e.Message + e.StackTrace);
288                 context.Response.Write("{"state":"error","code":-1,"msg":"接口调用出错 已记录日志"}");
289             }
290         }
291         public bool IsReusable
292         {
293             get
294             {
295                 return false;
296             }
297         }
298         public static void delFile(List<string> pathList) {
299             try
300             {
301 
302                 for (int i = 0; i < pathList.Count; i++)
303                 {
304                     File.Delete(pathList[i].Replace("\","/"));
305                 }
306             }
307             catch (Exception e)
308             {
309                 Util.LogHelper.Info("删除分片文件错误"+e.Message+e.StackTrace);
310             }
311         }
312 
313         /// <summary>
314         /// 创建部分文件集合
315         /// </summary>
316         /// <param name="context"></param>
317         public  void ProcessRequest(HttpContext context)
318         {
319             try
320             {
321 
322           
323             context.Response.ContentType = "application/json";
324 
325             string mode = context.Request["mode"].ToLower();
326                 if (mode == "partialfile")
327                     uploadPartialFile(context);
328                 else if (mode == "joinfile")
329                     joinfile(context);
330                 else if (mode == "uploadfile")
331                     uploadFile(context);
332                 else
333                 context.Response.Write("{"state":"error","code":-10,"msg":"接口调用出错 mode值范围为partialfile(上传分片文件)joinfile(合并分片文件)uploadfile上传单个文件 三种 "}");
334 
335             }
336 
337             catch (Exception e)
338             {
339 
340                 Util.LogHelper.Info("ProcessRequest执行错误" + e.Message + e.StackTrace);
341                 context.Response.Write("{"state":"error","code":-1,"msg":"接口调用出错 已记录日志"}");
342 
343 
344             }
345         }
346 
347 
348 
349 
350 
351 
352     }
353 }

js调用

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title></title>
</head>
<body>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
    <script src="https://cdn.bootcss.com/jquery.form/3.51/jquery.form.js"></script>
    <form id="fileUpLoad" action="/UpLoadPartialFile.ashx?mode=partialfile" method="post" name="test">
        <input type="file" name="name" onchange="upload(this)" />上传分片文件
        <input type="hidden" id="guid" name="guid"value="aaaaaaaaaaaaaaaa" />
        <input type="hidden" name="date" value="2017-10-02" />
        <input type="hidden" id="id" name="id" value="0" />

    </form>

    <form id="fileUpLoadFile" action="/UpLoadPartialFile.ashx?mode=uploadfile" method="post" name="test">
        <input type="file" name="name2" onchange="uploadFile(this)"  />上传单个文件

    </form>
    <input type="text" id="fileType" name="fileType" placeholder="合并的文件后缀名称 可选(合并文件时有效)" value="mp4" />
    <button onclick="joinFIle()">合并文件</button>

</body>
</html>

<script>

    function newGuid() {
        var guid = "";
        for (var i = 1; i <= 32; i++) {
            var n = Math.floor(Math.random() * 16.0).toString(16);
            guid += n;
          
        }
        return guid;
    }
    var idArray = '';
    var date = 2017-10-02;
   var  i = 0;
    var guid = newGuid();
    $('#guid').val(guid);
    function joinFIle() {

        $.ajax('/UpLoadPartialFile.ashx?mode=joinfile&date=2017-10-02&guid=' + guid + '&idArray=' + idArray + '&fileType=' + $('#fileType').val()).done(function (rs) {
            alert(rs.msg);
        })

    }
    function upload(obj) {

        if (obj.size == 0)
            return;
        //上传表单
        $('#id').val(++i);
        idArray += i+',';
        $('#fileUpLoad').ajaxSubmit();

    }

    function uploadFile() {
        $('#fileUpLoadFile').ajaxSubmit();
    }
</script>

C#调用

        private static void post1()
        {
            string url = @"http://localhost:1128/uploadPartialFile.ashx?mode=partialfile&date=2017-10-03&id=1&guid=5ed1eddf7e7213ed0db6d5150b488335";//这里就不暴露我们的地址啦
            string modelId = "4f1e2e3d-6231-4b13-96a4-835e5af10394";
            string updateTime = "2016-11-03 14:17:25";
            string encrypt = "f933797503d6e2c36762428a280e0559";

            string filePath = @"D:/test2";
            string fileName = "test2";
            byte[] fileContentByte = new byte[1024]; // 文件内容二进制

            #region 将文件转成二进制

            FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
            fileContentByte = new byte[fs.Length]; // 二进制文件
            fs.Read(fileContentByte, 0, Convert.ToInt32(fs.Length));
            fs.Close();

            #endregion


            #region 定义请求体中的内容 并转成二进制

            string boundary = "ceshi";
            string Enter = "
";

            string modelIdStr = "--" + boundary + Enter
                    + "Content-Disposition: form-data; name="modelId"" + Enter + Enter
                    + modelId + Enter;

            string fileContentStr = "--" + boundary + Enter
                    + "Content-Type:application/octet-stream" + Enter
                    + "Content-Disposition: form-data; name="fileContent"; filename="" + fileName + """ + Enter + Enter;

            string updateTimeStr = Enter + "--" + boundary + Enter
                    + "Content-Disposition: form-data; name="updateTime"" + Enter + Enter
                    + updateTime;

            string encryptStr = Enter + "--" + boundary + Enter
                    + "Content-Disposition: form-data; name="encrypt"" + Enter + Enter
                    + encrypt + Enter + "--" + boundary + "--";


            var modelIdStrByte = Encoding.UTF8.GetBytes(modelIdStr);//modelId所有字符串二进制

            var fileContentStrByte = Encoding.UTF8.GetBytes(fileContentStr);//fileContent一些名称等信息的二进制（不包含文件本身）

            var updateTimeStrByte = Encoding.UTF8.GetBytes(updateTimeStr);//updateTime所有字符串二进制

            var encryptStrByte = Encoding.UTF8.GetBytes(encryptStr);//encrypt所有字符串二进制


            #endregion


            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "multipart/form-data;boundary=" + boundary;

            Stream myRequestStream = request.GetRequestStream();//定义请求流

            #region 将各个二进制 安顺序写入请求流 modelIdStr -> (fileContentStr + fileContent) -> uodateTimeStr -> encryptStr

            myRequestStream.Write(modelIdStrByte, 0, modelIdStrByte.Length);

            myRequestStream.Write(fileContentStrByte, 0, fileContentStrByte.Length);
            myRequestStream.Write(fileContentByte, 0, fileContentByte.Length);

            myRequestStream.Write(updateTimeStrByte, 0, updateTimeStrByte.Length);

            myRequestStream.Write(encryptStrByte, 0, encryptStrByte.Length);

            #endregion

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();//发送

            Stream myResponseStream = response.GetResponseStream();//获取返回值
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));

            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();
        }

Code=0表示接口调用成功

其他情况下code为负数 msg中包含具体错误信息

单个分片文件上传不能超过4000kb

上传分片文件

http://localhost:1128/UpLoadPartialFile.ashx?mode=partialfile

method:post

参数

date 分片上传参数格式yyyy-MM-dd日期例如: 2017-10-02 所有分片上传都使用一个时间服务端根据这个参数来区分文件夹

id (整数) 分片文件编号如1 服务端合并文件将根据编号由小到大排序合并

guid 客户端生成一个guid 后面所有同一个文件的分片均使用同一个guid

guid为32位长度即省略-分隔符

浏览器js调用报文如下

调用成功返回json

{"state":"success","code":0,"msg":" guid为db334a03fc01b200c770871374734c7b文件id为1的文件写入成功"}

合并分片文件

http://localhost:1128/UpLoadPartialFile.ashx?mode=joinfile&date=2017-10-02&guid=db334a03fc01b200c770871374734c7b&idArray=1,2,&fileType=mp4

method :post

参数

date 分片上传时间(必选)

guid 上传分片时使用的guid (必选)

idArray 编号列表拼接逗号分隔需要两个以上否则无法合并文件(必选)

filetype 文件后缀名称可选如果传递该参数读取时也要传递否则无法找到文件

调用成功返回

{"state":"success","code":0,"msg":"2017102cdb64b77-5f7c-4ccf-aa11-1e327dfcd49f"}

Msg中的字符串用于读取文件

上传单个文件

http://localhost:1128/UpLoadPartialFile.ashx?mode=uploadfile

method:post

文件流写入到请求中

调用成功返回

{"state":"success","code":0,"msg":"2017102cdb64b77-5f7c-4ccf-aa11-1e327dfcd49f"}

Msg中的字符串用于读取文件

安卓参考实现

http://blog.csdn.net/ylbf_dev/article/details/50468984

ios参考实现

http://www.jianshu.com/p/a0e3c77d3164

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原文地址：https://www.cnblogs.com/ProDoctor/p/7625268.html