贴一下自己的源码

 

 

post：

 

 

string postData = "username=" + username + "&password=" + password;

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(""); //HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.Timeout = 300000; Encoding encoding = Encoding.GetEncoding("gb2312");//处理中文乱码 byte[] bytes = encoding.GetBytes(postData); request.ContentLength = bytes.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(bytes, 0, bytes.Length); requestStream.Flush(); requestStream.Close();

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

Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312")); string responseString = myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close();

MessageBox.Show(responseString);

 

 

 

get：

 

HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create( "http://www.google.com/webhp?hl=zh-CN" );

req.Method = "GET"; using (WebResponse wr = req.GetResponse()) { //在这里对接收到的页面内容进行处理 }

 

post上传文件

private void addpic_Click(object sender, EventArgs e)

{ this.openPic.Filter = "图片文件(*.jpg,*.gif,*.bmp)|*.jpg|*.gif|*.bmp"; if(DialogResult.OK==this.openPic.ShowDialog()&&(this.openPic.FileName!=null)) { Bitmap bit = new Bitmap(this.openPic.FileName); this.pictureBox1.Image = Image.FromHbitmap(bit.GetHbitmap());

int last = this.openPic.FileName.LastIndexOf(".");

string dat = this.openPic.FileName.Substring(last);

DateTime date = DateTime.Now;

picname=date.ToString("yyyyMMddHHmmss", DateTimeFormatInfo.InvariantInfo); picname = picname + dat; //MessageBox.Show(picpath + @"/" + picname + ".png"); //File.Move(this.openPic.FileName,picpath+@"/"+picname); File.Copy(this.openPic.FileName, picpath + @"/" + picname); string urlStr = ""; UploadFileBinary1(picpath + ", urlStr);

}

}

public void UploadFileBinary1(string localFile, string uploadUrl)

{ try {

DateTime time1;

time1 = DateTime.Now; long num3 = time1.Ticks; //text1 = "---------------------" + num3.ToString("x");

string boundary = "---------------------------" + num3.ToString("x");

// Build up the post message header  StringBuilder sb = new StringBuilder(); sb.Append("--"); sb.Append(boundary); sb.Append("/r/n"); sb.Append("Content-Disposition: form-data; name=/"file/"; filename=/""); sb.Append(localFile); sb.Append("/""); sb.Append("/r/n"); sb.Append("Content-Type: application/octet-stream"); // sb.Append("Content-Type: application/x-xml"); //sb.Append("Content-Type: text/xml");  sb.Append("/r/n"); sb.Append("/r/n");

string postHeader = sb.ToString();

byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader); byte[] boundaryBytes = Encoding.ASCII.GetBytes("/r/n--" + boundary + "/r/n");

// Open the local file FileStream rdr = new FileStream(localFile, FileMode.Open);

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uploadUrl);

req.Method = "post";

req.AllowWriteStreamBuffering = true; req.ContentType = "multipart/form-data boundary=" + boundary; //req.ContentLength == boundaryBytes.Length + postHeaderBytes.Length + rdr.Length; req.ContentLength = boundaryBytes.Length + postHeaderBytes.Length + rdr.Length; // Retrieve request stream  Stream reqStream = req.GetRequestStream();

// BinaryReader r = new BinaryReader(rdr);

// byte[] postArray = r.ReadBytes((int)fs.Length); // Stream postStream = myWebClient.OpenWrite(uriString, "PUT"); reqStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

// Allocate byte buffer to hold file contents

long length = rdr.Length;

byte[] inData = new byte[409600];

// loop through the local file reading each data block

// and writing to the request stream buffer int bytesRead = rdr.Read(inData, 0, inData.Length); while (bytesRead > 0) { reqStream.Write(inData, 0, bytesRead); bytesRead = rdr.Read(inData, 0, inData.Length); }

rdr.Close();

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

reqStream.Close();

HttpWebResponse response = (HttpWebResponse)req.GetResponse();

Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("gb2312")); string retString = myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close();

// response.Close(); } catch (Exception ex) { string exContent; exContent = ex.ToString(); MessageBox.Show(exContent);

}

}

 

 

 

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 

request.Method = "POST";//这无论是赋post还是get，都必须用全大写，此值错一点，都会导致程序错误，因为不符合http协议  request.ContentType = "multipart/form-data; boundary=--abc";//或者为"application/x-www-form-urlencoded"，对应form标签里的 enctype属性，boundary那部分查是FORM元素各值的分隔符，具体请查阅HTTP协议相关文档，如果此值用application/x- www-form-urlencoded则form各元素用&来分隔，而元素的值是经过了url编码，调用System.Web.HttpUtility.UrlEncode方法，就能将值进行url编码。 //如果需要加cookie，则按如下方式添加，具体请参阅msdn  request.CookieContainer = new CookieContainer();  request.CookieContainer.Add(new Cookie("test", "i love u", "/", "localhost"));  byte[] data = Encoding.GetEncoding(encoding).GetBytes(postData);//将要发送的数据按HTTP协议拼装好字符串转成字节数组  request.ContentLength = data.Length;//设置内容的长度，长度就是要发送的整个字节数组的长度，此句必须有，长度不对就会导致错误  request.GetRequestStream().Write(data, 0, data.Length);//获取request的流，将数据写入流中，至此完成了form提交的必须有的步骤  response = (HttpWebResponse)request.GetResponse();//最后取得response获取服务器端的返回数据进行处理

     本文转自xyz_lmn51CTO博客，原文链接：http://blog.51cto.com/xyzlmn/819087，如需转载请自行联系原作者