JS和WebService大文件上传代码分享

var BYTES_PER_CHUNK = 1024 * 1024; // 每个文件切片大小定为1MB .
var slices;
var totalSlices;

//发送请求
function sendRequest() {
var blob = document.getElementById("yourID").files[0];
var start = 0;
var end;
var index = 0;


// 计算文件切片总数
slices = Math.ceil(blob.size / BYTES_PER_CHUNK);
totalSlices= slices;
while(start < blob.size) {
end = start + BYTES_PER_CHUNK;
if(end > blob.size) {
end = blob.size;
}
uploadFile(blob, index, start, end);
start = end;
index++;
if ( index>=totalSlices )
alert("Complete!!");
}
}

//上传文件
function uploadFile(blob, index, start, end) {
var xhr;
var fd;
var chunk; 
var sliceIndex=blob.name+index;
chunk =blob.slice(start,end);//切割文件

fd = new FormData();
fd.append("FileName", chunk, sliceIndex);
var xhr = new XMLHttpRequest();
xhr.open('POST', 'Server URL', false);//false,同步上传；ture，异步上传
xhr.send(fd);
if((xhr.status >=200 && xhr.status < 300) || xhr.status == 304){
setTimeout("",10);
}else{
uploadFile(blob, index, start, end);
}
}

public void RecoveryKPJD()
 {
 HttpContext context = System.Web.HttpContext.Current;
 context.Response.ContentType = "text/plain";
 //如果进行了分片
 if (context.Request.Form.AllKeys.Any(m => m == "chunk"))
 {
 //取得chunk和chunks
 int chunk = Convert.ToInt32(context.Request.Form["chunk"]);//当前分片在上传分片中的顺序（从0开始）
 int chunks = Convert.ToInt32(context.Request.Form["chunks"]);//总分片数
 //根据GUID创建用该GUID命名的临时文件夹
 string folder = Your Path + context.Request["guid"] + "/";
 string path = folder + chunk;


 //建立临时传输文件夹
 if (!Directory.Exists(Path.GetDirectoryName(folder)))
 {
 Directory.CreateDirectory(folder);
 }

 FileStream addFile = new FileStream(path, FileMode.Append, FileAccess.Write);
 BinaryWriter AddWriter = new BinaryWriter(addFile);
 //获得上传的分片数据流
 HttpPostedFile file = context.Request.Files[0];
 Stream stream = file.InputStream;

 BinaryReader TempReader = new BinaryReader(stream);
 //将上传的分片追加到临时文件末尾
 AddWriter.Write(TempReader.ReadBytes((int)stream.Length));
 //关闭BinaryReader文件阅读器
 TempReader.Close();
 stream.Close();
 AddWriter.Close();
 addFile.Close();

 TempReader.Dispose();
 stream.Dispose();
 AddWriter.Dispose();
 addFile.Dispose();
 if (chunk == chunks - 1)
 {
 //合并文件
 ProcessRequest(context.Request["guid"], Path.GetExtension(file.FileName));
 }
 }
 else//没有分片直接保存
 {
 string targetPath = ""; //此处写文件的保存路径
 context.Request.Files[0].SaveAs(targetPath);
 }
 }

 private void ProcessRequest(string guid, string fileExt)
 {
 HttpContext context = System.Web.HttpContext.Current;
 context.Response.ContentType = "text/plain";
 string sourcePath = Path.Combine("Your Path", guid + "/");//源数据文件夹
 string targetPath = Path.Combine("Your Path", Guid.NewGuid() + fileExt);//合并后的文件

 DirectoryInfo dicInfo = new DirectoryInfo(sourcePath);
 if (Directory.Exists(Path.GetDirectoryName(sourcePath)))
 {
 FileInfo[] files = dicInfo.GetFiles();
 foreach (FileInfo file in files.OrderBy(f => int.Parse(f.Name)))
 {
 FileStream addFile = new FileStream(targetPath, FileMode.AppenFileAccess.Write);
 BinaryWriter AddWriter = new BinaryWriter(addFile);

 //获得上传的分片数据流
 Stream stream = file.Open(FileMode.Open);
 BinaryReader TempReader = new BinaryReader(stream);
 //将上传的分片追加到临时文件末尾
 AddWriter.Write(TempReader.ReadBytes((int)stream.Length));
 //关闭BinaryReader文件阅读器
 TempReader.Close();
 stream.Close();
 AddWriter.Close();
 addFile.Close();

 TempReader.Dispose();
 stream.Dispose();
 AddWriter.Dispose();
 addFile.Dispose();
 }
 }
 }