【实例简介】

可以实现文件上传到服务器的功能

【实例截图】

【核心代码】

public int UpSound_Request(string address, string fileNamePath, string saveName, ProgressBar progressBar)

{

int returnValue = 0;

//要上传的文件

FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);

//二进制对象

BinaryReader r = new BinaryReader(fs);

//时间戳

string strBoundary = "----------" DateTime.Now.Ticks.ToString("x");

byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" strBoundary "\r\n");

//请求的头部信息

StringBuilder sb = new StringBuilder();

sb.Append("--");

sb.Append(strBoundary);

sb.Append("\r\n");

sb.Append("Content-Disposition: form-data; name=\"");

sb.Append("file");

sb.Append("\"; filename=\"");

sb.Append(saveName);

sb.Append("\";");

sb.Append("\r\n");

sb.Append("Content-Type: ");

sb.Append("application/octet-stream");

sb.Append("\r\n");

sb.Append("\r\n");

string strPostHeader = sb.ToString();

byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);

// 根据uri创建HttpWebRequest对象

HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));

httpReq.Method = "POST";

//对发送的数据不使用缓存

httpReq.AllowWriteStreamBuffering = false;

//设置获得响应的超时时间(300秒)

httpReq.Timeout = 300000;

httpReq.ContentType = "multipart/form-data; boundary=" strBoundary;

long length = fs.Length postHeaderBytes.Length boundaryBytes.Length;

long fileLength = fs.Length;

httpReq.ContentLength = length;

try

{

progressBar.Maximum = int.MaxValue;

progressBar.Minimum = 0;

progressBar.Value = 0;

//每次上传4k

int bufferLength = 4096;

byte[] buffer = new byte[bufferLength]; //已上传的字节数

long offset = 0;         //开始上传时间

DateTime startTime = DateTime.Now;

int size = r.Read(buffer, 0, bufferLength);

Stream postStream = httpReq.GetRequestStream();         //发送请求头部消息

postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

while (size > 0)

{

postStream.Write(buffer, 0, size);

offset = size;

progressBar.Value = (int)(offset * (int.MaxValue / length));

TimeSpan span = DateTime.Now - startTime;

double second = span.TotalSeconds;

labTime.Text = "已用时：" second.ToString("F2") "秒";

if (second > 0.001)

{

labSpeed.Text = "平均速度：" (offset / 1024 / second).ToString("0.00") "KB/秒";

}

else

{

labSpeed.Text = " 正在连接…";

}

labState.Text = "已上传：" (offset * 100.0 / length).ToString("F2") "%";

labSize.Text = (offset / 1048576.0).ToString("F2") "M/" (fileLength / 1048576.0).ToString("F2") "M";

Application.DoEvents();

size = r.Read(buffer, 0, bufferLength);

}

//添加尾部的时间戳

postStream.Write(boundaryBytes, 0, boundaryBytes.Length);

postStream.Close();

//获取服务器端的响应

WebResponse webRespon = httpReq.GetResponse();

Stream s = webRespon.GetResponseStream();

//读取服务器端返回的消息

StreamReader sr = new StreamReader(s);

String sReturnString = sr.ReadLine();

s.Close();

sr.Close();

if (sReturnString == "Success")

{

returnValue = 1;

}

else if (sReturnString == "Error")

{

returnValue = 0;

}

}

catch

{

returnValue = 0;

}

finally

{

fs.Close();

r.Close();

}

return returnValue;

}