/// <summary>
/// 上传
/// </summary>
/// <returns>异步则返回进程ID，同步返回上传文件的路径</returns>
public string Upload(ICompatiblePostedFile postedFile)
{
ICompatibleRequest request = HttpHosting.Context.Request;
String baseDir = EnvUtil.GetBaseDirectory();
string[] process = request.Form("upload_process")[0].Split('|');
string processId = process[1];
if (postedFile == null)
{
return(null);
}
string fileName = postedFile.GetFileName();
string fileExt = fileName.Substring(fileName.LastIndexOf('.') + 1); //扩展名
InitUplDirectory(baseDir, this._saveAbsoluteDir);
this._fileInfo = new UploadFileInfo
{
Id = processId,
ContentLength = postedFile.GetLength(),
FilePath = $"{this._saveAbsoluteDir}{this._fileName}.{fileExt}"
};
String targetPath = baseDir + this._fileInfo.FilePath;
if (!this._autoRename && File.Exists(targetPath))
{
throw new IOException("文件已存在");
}
// 自动将重复的名称命名
int i = 0;
while (File.Exists(targetPath))
{
i++;
this._fileInfo.FilePath = $"{this._saveAbsoluteDir}{this._fileName}_{i.ToString()}.{fileExt}";
targetPath = baseDir + this._fileInfo.FilePath;
}
this.SaveStream(postedFile.OpenReadStream(), targetPath);
return(_fileInfo.FilePath);
}
private void SaveFile(ICompatiblePostedFile imgFile, string targetPath)
{
FileUtil.SaveStream(imgFile.OpenReadStream(), targetPath);
}
/// <summary>
/// 文件上传至远程服务器
/// </summary>
/// <param name="url">远程服务地址</param>
/// <param name="postedFile">上传文件</param>
/// <param name="parameters">POST参数</param>
/// <param name="cookieContainer">cookie</param>
/// <param name="output">远程服务器响应字符串</param>
public void HttpPostFile(string url, ICompatiblePostedFile postedFile, Dictionary <string, object> parameters,
CookieContainer cookieContainer, ref string output)
{
//1>创建请求
var request = (HttpWebRequest)WebRequest.Create(url);
//2>Cookie容器
request.CookieContainer = cookieContainer;
request.Method = "POST";
request.Timeout = 20000;
request.Credentials = CredentialCache.DefaultCredentials;
request.KeepAlive = true;
var boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x"); //分界线
var boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
//内容类型
request.ContentType = "multipart/form-data; boundary=" + boundary;
//3>表单数据模板
var formDataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
//4>读取流
var buffer = new byte[postedFile.GetLength()];
postedFile.OpenReadStream().Read(buffer, 0, buffer.Length);
//5>写入请求流数据
var strHeader =
"Content-Disposition:application/x-www-form-urlencoded; name=\"{0}\";filename=\"{1}\"\r\nContent-Type:{2}\r\n\r\n";
strHeader = string.Format(strHeader, "filedata", postedFile.GetFileName(), postedFile.GetContentType());
//6>HTTP请求头
var byteHeader = Encoding.ASCII.GetBytes(strHeader);
try
{
using (var stream = request.GetRequestStream())
{
//写入请求流
if (null != parameters)
{
foreach (var item in parameters)
{
stream.Write(boundaryBytes, 0, boundaryBytes.Length); //写入分界线
var formBytes =
Encoding.UTF8.GetBytes(string.Format(formDataTemplate, item.Key, item.Value));
stream.Write(formBytes, 0, formBytes.Length);
}
}
//6.0>分界线============================================注意：缺少次步骤，可能导致远程服务器无法获取Request.Files集合
stream.Write(boundaryBytes, 0, boundaryBytes.Length);
//6.1>请求头
stream.Write(byteHeader, 0, byteHeader.Length);
//6.2>把文件流写入请求流
stream.Write(buffer, 0, buffer.Length);
//6.3>写入分隔流
var trailer = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
stream.Write(trailer, 0, trailer.Length);
//6.4>关闭流
stream.Close();
}
var response = (HttpWebResponse)request.GetResponse();
using (var reader = new StreamReader(response.GetResponseStream()))
{
output = reader.ReadToEnd();
}
response.Close();
}
catch (Exception ex)
{
throw new Exception("上传文件时远程服务器发生异常！", ex);
}
}