C# HttpWebRequest 后台调用接口上传大文件以及其他参数
直接上代码，包各位看客能用！！！
1.首先请求参数的封装
/// <summary>
/// 上传文件 - 请求参数类
/// </summary>
public class UploadParameterType
{
public UploadParameterType()
{
FileNameKey = "fileName";
Encoding = Encoding.UTF8;
PostParameters = new Dictionary<string, string>();
}
/// <summary>
/// 上传地址
/// </summary>
public string Url { get; set; }
/// <summary>
/// 文件名称key
/// </summary>
public string FileNameKey { get; set; }
/// <summary>
/// 文件名称value
/// </summary>
public string FileNameValue { get; set; }
/// <summary>
/// 编码格式
/// </summary>
public Encoding Encoding { get; set; }
/// <summary>
/// 上传文件的流
/// </summary>
public Stream UploadStream { get; set; }
/// <summary>
/// 上传文件 携带的参数集合
/// </summary>
public IDictionary<string, string> PostParameters { get; set; }
}
2.HttpWebRequest 封装
/// <summary>
/// Http上传文件类 - HttpWebRequest封装
/// </summary>
public class HttpUploadClient
{
/// <summary>
/// 上传执行 方法
/// </summary>
/// <param name="parameter">上传文件请求参数</param>
public static string Execute(UploadParameterType parameter)
{
using (MemoryStream memoryStream = new MemoryStream())
{
// 1.分界线
string boundary = string.Format("----{0}", DateTime.Now.Ticks.ToString("x")), // 分界线可以自定义参数
beginBoundary = string.Format("--{0}\r\n", boundary),
endBoundary = string.Format("\r\n--{0}--\r\n", boundary);
byte[] beginBoundaryBytes = parameter.Encoding.GetBytes(beginBoundary),
endBoundaryBytes = parameter.Encoding.GetBytes(endBoundary);
// 2.组装开始分界线数据体 到内存流中
memoryStream.Write(beginBoundaryBytes, 0, beginBoundaryBytes.Length);
// 3.组装 上传文件附加携带的参数 到内存流中
if (parameter.PostParameters != null && parameter.PostParameters.Count > 0)
{
foreach (KeyValuePair<string, string> keyValuePair in parameter.PostParameters)
{
string parameterHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n{2}", keyValuePair.Key, keyValuePair.Value, beginBoundary);
byte[] parameterHeaderBytes = parameter.Encoding.GetBytes(parameterHeaderTemplate);
memoryStream.Write(parameterHeaderBytes, 0, parameterHeaderBytes.Length);
}
}
// 4.组装文件头数据体 到内存流中
string fileHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n", parameter.FileNameKey, parameter.FileNameValue);
byte[] fileHeaderBytes = parameter.Encoding.GetBytes(fileHeaderTemplate);
memoryStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);
// 5.组装文件流 到内存流中
byte[] buffer = new byte[1024 * 1024 * 1];
int size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
while (size > 0)
{
memoryStream.Write(buffer, 0, size);
size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
}
// 6.组装结束分界线数据体 到内存流中
memoryStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
// 7.获取二进制数据
byte[] postBytes = memoryStream.ToArray();
memoryStream.Close();
GC.Collect();
// 8.HttpWebRequest 组装
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(parameter.Url, UriKind.RelativeOrAbsolute));
webRequest.AllowWriteStreamBuffering = false;
webRequest.Method = "POST";
webRequest.Timeout = 1800000;
webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
webRequest.ContentLength = postBytes.Length;
if (Regex.IsMatch(parameter.Url, "^https://"))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;
}
// 9.写入上传请求数据
using (Stream requestStream = webRequest.GetRequestStream())
{
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();
}
// 10.获取响应
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(webResponse.GetResponseStream(), parameter.Encoding))
{
string body = reader.ReadToEnd();
reader.Close();
return body;
}
}
}
}
/// <summary>
/// 上传执行 方法
/// </summary>
/// <param name="parameter">上传文件请求参数</param>
public static string Execute2(UploadParameterType parameter)
{
// 1.分界线
string boundary = string.Format("----{0}", DateTime.Now.Ticks.ToString("x")), // 分界线可以自定义参数
beginBoundary = string.Format("--{0}\r\n", boundary),
endBoundary = string.Format("\r\n--{0}--\r\n", boundary);
byte[] beginBoundaryBytes = parameter.Encoding.GetBytes(beginBoundary),
endBoundaryBytes = parameter.Encoding.GetBytes(endBoundary);
byte[] postBytes = new byte[] { };
using (MemoryStream memoryStream = new MemoryStream())
{
// 2.组装开始分界线数据体 到内存流中
memoryStream.Write(beginBoundaryBytes, 0, beginBoundaryBytes.Length);
// 3.组装 上传文件附加携带的参数 到内存流中
if (parameter.PostParameters != null && parameter.PostParameters.Count > 0)
{
foreach (KeyValuePair<string, string> keyValuePair in parameter.PostParameters)
{
string parameterHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n{2}", keyValuePair.Key, keyValuePair.Value, beginBoundary);
byte[] parameterHeaderBytes = parameter.Encoding.GetBytes(parameterHeaderTemplate);
memoryStream.Write(parameterHeaderBytes, 0, parameterHeaderBytes.Length);
}
}
// 4.组装文件头数据体 到内存流中
string fileHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n", parameter.FileNameKey, parameter.FileNameValue);
byte[] fileHeaderBytes = parameter.Encoding.GetBytes(fileHeaderTemplate);
memoryStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);
// 5.组装结束分界线数据体 到内存流中
//memoryStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
// 6.获取二进制数据
postBytes = memoryStream.ToArray();
}
// 7.HttpWebRequest 组装
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(parameter.Url, UriKind.RelativeOrAbsolute));
//对发送的数据不使用缓存【重要、关键】
webRequest.AllowWriteStreamBuffering = false;
webRequest.Method = "POST";
webRequest.Timeout = 1800000;
webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
webRequest.ContentLength = postBytes.Length + parameter.UploadStream.Length+endBoundaryBytes.Length;
if (Regex.IsMatch(parameter.Url, "^https://"))
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.ServerCertificateValidationCallback = CheckValidationResult;
}
// 8.组装文件流
byte[] buffer = new byte[1024 * 1024 * 1];
int size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
Stream requestStream = webRequest.GetRequestStream();
requestStream.Write(postBytes, 0, postBytes.Length);
while (size > 0)
{
requestStream.Write(buffer, 0, size);
size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
}
requestStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
requestStream.Close();
// 9.获取响应
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(webResponse.GetResponseStream(), parameter.Encoding))
{
string body = reader.ReadToEnd();
reader.Close();
return body;
}
}
}
static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
return true;
}
}
HttpUploadClient类中两个Execute2，参考网上，大都用第一个，如果上传小文件没问题，要是比较大（百兆以上）就会内存溢出，然后就用流方式。思路是一样的
3.调用示例：
using (FileStream fs = new FileStream(@"C:\\test.zip", FileMode.Open, FileAccess.Read))
{
Dictionary<string, string> postParameter = new Dictionary<string, string>();
postParameter.Add("name", "heshang");
postParameter.Add("param", "1 2 3");
string result = HttpUploadClient.Execute(new UploadParameterType
{
Url = url,
UploadStream = fs,
FileNameValue = "test.zip",
PostParameters = postParameter
});
}
4.接口服务后台接受请求时：
public IHttpActionResult Post()
{
HttpPostedFile file = HttpContext.Current.Request.Files[0];
string pyPath = HttpContext.Current.Request["name"];
string Params = HttpContext.Current.Request["params"];
file.SaveAs("C:\\test.zip");
return Ok("");
}
5.完美解决大文件上传
