Web API之基于H5客户端分段上传大文件
http://www.cnblogs.com/OneDirection/articles/7285739.html
查询很多资料没有遇到合适的，对于MultipartFormDataStreamProvider 也并是很适合，总会出现问题。于是放弃，使用了传统的InputStream 分段处理完之后做merge处理。
前台分段规则 命名要规范，传递分段总文件数便于判定分段上传完成做merge处理。merge需要根据分段顺序并在merge成功后删除分段文件。
var FilePartName = file.name + ".part_" + PartCount + "." + TotalParts;
前台JS代码：
<script>
$(document).ready(function () {
$('#btnUpload').click(function () {
var files = $('#uploadfile')[0].files;
for (var i = 0; i < files.length; i++) {
UploadFile(files[i]);
}
}
);
});
function UploadFileChunk(Chunk, FileName) {
var fd = new FormData();
fd.append('file', Chunk, FileName);
fd.append('UserName', 'ming.lu@genewiz.com');
fd.append('BusinessLine', '1');
fd.append('ServiceItemType', '109');
fd.append('Comment', 'This is order comment for GA order');
fd.append('UserId', '43F0FEDF-E9AF-4289-B71B-54807BCB8CD9');
$.ajax({
type: "POST",
url: 'http://localhost:50821/api/customer/GA/SaveSangerCameraOrder',
contentType: false,
processData: false,
data: fd,
success: function (data) {
alert(data);
},
error: function (data) {
alert(data.status + " : " + data.statusText + " : " + data.responseText);
}
});
}
function UploadFile(TargetFile) {
// create array to store the buffer chunks
var FileChunk = [];
// the file object itself that we will work with
var file = TargetFile;
// set up other initial vars
var MaxFileSizeMB = 5;
var BufferChunkSize = MaxFileSizeMB * (1024 * 1024);
var ReadBuffer_Size = 1024;
var FileStreamPos = 0;
// set the initial chunk length
var EndPos = BufferChunkSize;
var Size = file.size;
// add to the FileChunk array until we get to the end of the file
while (FileStreamPos < Size) {
// "slice" the file from the starting position/offset, to the required length
FileChunk.push(file.slice(FileStreamPos, EndPos));
FileStreamPos = EndPos; // jump by the amount read
EndPos = FileStreamPos + BufferChunkSize; // set next chunk length
}
// get total number of "files" we will be sending
var TotalParts = FileChunk.length;
var PartCount = 0;
// loop through, pulling the first item from the array each time and sending it
while (chunk = FileChunk.shift()) {
PartCount++;
// file name convention
var FilePartName = file.name + ".part_" + PartCount + "." + TotalParts;
// send the file
UploadFileChunk(chunk, FilePartName);
}
}
</script>
MaxFileSizeMB参数设置分段大小 ，测试例子为5M
chunk = FileChunk.shift() 在分段上传成功之后删除已上传分段
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HTML代码： |
<h2>Test Multiple Chunk Upload</h2>
<p>
<input type="file" name="uploadfile" id="uploadfile" multiple="multiple" />
<br />
<a href="#" id="btnUpload" class="btn btn-primary">Upload file</a>
</p>
后台webapi controller代码：
/// <summary>
/// Upload sanger camera order
/// </summary>
/// <param name="model">user id and user email are required</param>
/// <returns></returns>
[HttpPost]
[Route("api/customer/GA/SaveSangerCameraOrder")]
[MimeMultipart]
public HttpResponseMessage SaveSangerCameraOrder()
{
var files = HttpContext.Current.Request.Files;
if (files.Count <= 0)
{
return new HttpResponseMessage()
{
StatusCode = System.Net.HttpStatusCode.OK,
Content = new StringContent(ConstantStringHelper.API_FAILED)
};
}
//receice request form parameters
var userName = HttpContext.Current.Request.Form["UserName"];
var businessLine = HttpContext.Current.Request.Form["BusinessLine"];
var serviceItemType = HttpContext.Current.Request.Form["ServiceItemType"];
var comment = HttpContext.Current.Request.Form["Comment"];
var userId = HttpContext.Current.Request.Form["UserId"];
if (string.IsNullOrEmpty(userName)) userName = "UnknownUser";
string dateTimeTicket = string.Format("{0:yyyy-MM-dd}", System.DateTime.Now);
var storagePath = ConfigurationManager.AppSettings["SangerOrderStorageLocation"].ToString();
var fileSavePath = storagePath + @"/" + userName + "/" + dateTimeTicket + "/";
foreach (string file in files)
{
var FileDataContent = HttpContext.Current.Request.Files[file];
if (FileDataContent != null && FileDataContent.ContentLength > 0)
{
// take the input stream, and save it to a temp folder using
// the original file.part name posted
var stream = FileDataContent.InputStream;
var fileName = Path.GetFileName(FileDataContent.FileName);
var UploadPath = HttpContext.Current.Request.MapPath(fileSavePath);
Directory.CreateDirectory(UploadPath);
string path = Path.Combine(UploadPath, fileName);
if (System.IO.File.Exists(path))
System.IO.File.Delete(path);
using (var fileStream = System.IO.File.Create(path))
{
stream.CopyTo(fileStream);
}
// Once the file part is saved, see if we have enough to merge it
Utils UT = new Utils();
var isMergedSuccess = UT.MergeFile(path);
if (isMergedSuccess)
{
//generate txt document for customer comment
string timeTicket = string.Format("{0:yyyyMMddHHmmss}", System.DateTime.Now);
FileStream fs = new FileStream(UploadPath + timeTicket + "OrderComment.txt", FileMode.Create);
//get byte
byte[] data = System.Text.Encoding.Default.GetBytes(comment);
//write
fs.Write(data, 0, data.Length);
//clear and clost stream
fs.Flush();
fs.Close();
}
}
}
return new HttpResponseMessage()
{
StatusCode = System.Net.HttpStatusCode.OK,
Content = new StringContent(ConstantStringHelper.API_SUCCESS)
};
}
工具类代码：
记得关闭stream
public class Utils
{
public string FileName { get; set; }
public string TempFolder { get; set; }
public int MaxFileSizeMB { get; set; }
public List<String> FileParts { get; set; }
public Utils()
{
FileParts = new List<string>();
}
/// <summary>
/// original name + ".part_N.X" (N = file part number, X = total files)
/// Objective = enumerate files in folder, look for all matching parts of split file. If found, merge and return true.
/// </summary>
/// <param name="FileName"></param>
/// <returns></returns>
public bool MergeFile(string FileName)
{
bool rslt = false;
// parse out the different tokens from the filename according to the convention
string partToken = ".part_";
string baseFileName = FileName.Substring(0, FileName.IndexOf(partToken));
string trailingTokens = FileName.Substring(FileName.IndexOf(partToken) + partToken.Length);
int FileIndex = 0;
int FileCount = 0;
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out FileIndex);
int.TryParse(trailingTokens.Substring(trailingTokens.IndexOf(".") + 1), out FileCount);
// get a list of all file parts in the temp folder
string Searchpattern = Path.GetFileName(baseFileName) + partToken + "*";
string[] FilesList = Directory.GetFiles(Path.GetDirectoryName(FileName), Searchpattern);
// merge .. improvement would be to confirm individual parts are there / correctly in sequence, a security check would also be important
// only proceed if we have received all the file chunks
if (FilesList.Count() == FileCount)
{
// use a singleton to stop overlapping processes
if (!MergeFileManager.Instance.InUse(baseFileName))
{
MergeFileManager.Instance.AddFile(baseFileName);
if (File.Exists(baseFileName))
File.Delete(baseFileName);
// add each file located to a list so we can get them into
// the correct order for rebuilding the file
List<SortedFile> MergeList = new List<SortedFile>();
foreach (string file in FilesList)
{
SortedFile sFile = new SortedFile();
sFile.FileName = file;
baseFileName = file.Substring(0, file.IndexOf(partToken));
trailingTokens = file.Substring(file.IndexOf(partToken) + partToken.Length);
int.TryParse(trailingTokens.Substring(0, trailingTokens.IndexOf(".")), out FileIndex);
sFile.FileOrder = FileIndex;
MergeList.Add(sFile);
}
// sort by the file-part number to ensure we merge back in the correct order
var MergeOrder = MergeList.OrderBy(s => s.FileOrder).ToList();
using (FileStream FS = new FileStream(baseFileName, FileMode.Create))
{
try
{
// merge each file chunk back into one contiguous file stream
foreach (var chunk in MergeOrder)
{
using (FileStream fileChunk = new FileStream(chunk.FileName, FileMode.Open))
{
fileChunk.CopyTo(FS);
fileChunk.Flush();
fileChunk.Close();
fileChunk.Dispose();
}
}
foreach (var item in FilesList)
{
if (File.Exists(item))
File.Delete(item);
}
}
catch (Exception ex)
{
FS.Flush();
FS.Close();
FS.Dispose();
throw new Exception(ex.Message);
}
}
rslt = true;
// unlock the file from singleton
MergeFileManager.Instance.RemoveFile(baseFileName);
}
}
return rslt;
}
public List<string> SplitFiles()
{
//bool rslt = false;
string BaseFileName = Path.GetFileName(FileName);
// set the size of file chunk we are going to split into
int BufferChunkSize = 5 * (1024 * 1024); //5MB
// set a buffer size and an array to store the buffer data as we read it
const int READBUFFER_SIZE = 1024;
byte[] FSBuffer = new byte[READBUFFER_SIZE];
// open the file to read it into chunks
using (FileStream FS = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// calculate the number of files that will be created
int TotalFileParts = 0;
if (FS.Length < BufferChunkSize)
{
TotalFileParts = 1;
}
else
{
float PreciseFileParts = ((float)FS.Length / (float)BufferChunkSize);
TotalFileParts = (int)Math.Ceiling(PreciseFileParts);
}
int FilePartCount = 0;
// scan through the file, and each time we get enough data to fill a chunk, write out that file
while (FS.Position < FS.Length)
{
string FilePartName = String.Format("{0}.part_{1}.{2}",
BaseFileName, (FilePartCount + 1).ToString(), TotalFileParts.ToString());
FilePartName = Path.Combine(TempFolder, FilePartName);
FileParts.Add(FilePartName);
using (FileStream FilePart = new FileStream(FilePartName, FileMode.Create))
{
int bytesRemaining = BufferChunkSize;
int bytesRead = 0;
while (bytesRemaining > 0 && (bytesRead = FS.Read(FSBuffer, 0,
Math.Min(bytesRemaining, READBUFFER_SIZE))) > 0)
{
FilePart.Write(FSBuffer, 0, bytesRead);
bytesRemaining -= bytesRead;
}
}
// file written, loop for next chunk
FilePartCount++;
}
}
return FileParts;
//return rslt;
}
}
public struct SortedFile
{
public int FileOrder { get; set; }
public String FileName { get; set; }
}
public class MergeFileManager
{
private static MergeFileManager instance;
private List<string> MergeFileList;
private MergeFileManager()
{
try
{
MergeFileList = new List<string>();
}
catch { }
}
public static MergeFileManager Instance
{
get
{
if (instance == null)
instance = new MergeFileManager();
return instance;
}
}
public void AddFile(string BaseFileName)
{
MergeFileList.Add(BaseFileName);
}
public bool InUse(string BaseFileName)
{
return MergeFileList.Contains(BaseFileName);
}
public bool RemoveFile(string BaseFileName)
{
return MergeFileList.Remove(BaseFileName);
}
}
如该文件分六段上传，则会提示六次success，可以按照自己业务处理。
