asp.net 模擬提交有文件上傳的表單(通過http模擬上傳文件)

<form action="sql.aspx" method="post" enctype="multipart/form-data"> 
<input id="Text1" name="content" type="text" /><br /> 
<input id="Text2" name="uploadImg" type="text" /><br /> 
<input id="File1" type="file" name="image0" /><br /> 
<input id="Submit1" type="submit" value="submit" /> 
</form> 
 
為了查看表單提交時，向服務(wù)端post了什么數(shù)據(jù)，這里我使用Fiddler來查看。Fiddler確實是個不錯的工具，注意當(dāng)url主機地址是localhost時Fiddler捕獲不到，需要再localhost后加一點(.)即可，打開Fiddler，瀏覽帶上面form的page，輸入數(shù)據(jù)提交，此時在Fiddler中可看到post的數(shù)據(jù)了。下面是一部份數(shù)據(jù)的截圖。 

分析其中的數(shù)據(jù)不難得出，一個表單中的數(shù)據(jù)域(input type="text")對應(yīng)的格式為 
-----------------------------7da119c1004a6 
Content-Disposition: form-data; name="content" 
this is a txt value 
一個文件(input type="file")對應(yīng)的格式為(通常為表單最后一個參數(shù)) 
-----------------------------7da119c1004a6 
Content-Disposition: form-data; name="image0"; filename="E:\CAI\875.jpg" 
Content-Type: image/pjpeg 
[文件內(nèi)容] 
結(jié)尾處是-----------------------------7da119c1004a6-- 
有了上面的數(shù)據(jù)做參考，按照其格式組織數(shù)據(jù)，post到服務(wù)端，同樣可以達(dá)到html form提交的效果。要特別注意其格式：如回車換行，差一個都可能得不到正確的響應(yīng)，還有請求的Content-Length一定計算對。下面是一個參考： 
代碼 
 代碼如下:

public string POSTfile(string v1,string v2, string file) 
{ 
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x"); 
//請求 
WebRequest req = WebRequest.Create(@"http://localhost.:4944/WebSite1/getfile.aspx"); 
req.Method = "POST"; 
req.ContentType = "multipart/form-data; boundary=" + boundary; 
//組織表單數(shù)據(jù) 
StringBuilder sb = new StringBuilder(); 
sb.Append("--" + boundary); 
sb.Append("\r\n"); 
sb.Append("Content-Disposition: form-data; name=\"content\""); 
sb.Append("\r\n\r\n"); 
sb.Append(v1); 
sb.Append("\r\n"); 
sb.Append("--" + boundary); 
sb.Append("\r\n"); 
sb.Append("Content-Disposition: form-data; name=\"uploadImg\""); 
sb.Append("\r\n\r\n"); 
sb.Append("v2"); 
sb.Append("\r\n"); 
sb.Append("--" + boundary); 
sb.Append("\r\n"); 
sb.Append("Content-Disposition: form-data; name=\"image0\"; filename=\"e:\\a.jpg\""); 
sb.Append("\r\n"); 
sb.Append("Content-Type: image/pjpeg"); 
sb.Append("\r\n\r\n"); 
string head = sb.ToString(); 
byte[] form_data = Encoding.UTF8.GetBytes(head); 
//結(jié)尾 
byte[] foot_data = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); 
//文件 
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read); 
//post總長度 
long length = form_data.Length + fileStream.Length + foot_data.Length; 
req.ContentLength = length; 
Stream requestStream = req.GetRequestStream(); 
//發(fā)送表單參數(shù) 
requestStream.Write(form_data, 0, form_data.Length); 
//文件內(nèi)容 
byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))]; 
int bytesRead = 0; 
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) 
requestStream.Write(buffer, 0, bytesRead); 
//結(jié)尾 
requestStream.Write(foot_data, 0, foot_data.Length); 
requestStream.Close(); 
//響應(yīng) 
WebResponse pos = req.GetResponse(); 
StreamReader sr = new StreamReader(pos.GetResponseStream(), Encoding.UTF8); 
string html = sr.ReadToEnd().Trim(); 
sr.Close(); 
if (pos != null) 
{ 
pos.Close(); 
pos = null; 
} 
if (req != null) 
{ 
req = null; 
} 
return html; 
} 

 
 




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