C# .Net WebClient http及https请求及上传文件
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Web;
namespace Tools
{
public class RestfullRequest
{
public static string Request(string url, string method, string contentType, string data, NameValueCollection header = null, NetworkCredential credential = null,
string proxyAddress = null, Encoding responseEncoding = null)
{
var request = (HttpWebRequest)WebRequest.Create(url);
if (url.StartsWith("https://"))
{
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(RemoteCertificateValidate);//验证服务器证书回调自动验证
ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
}
request.Method = method;
if (!string.IsNullOrEmpty(contentType))
request.ContentType = contentType;
if (header != null)
request.Headers.Add(header);
if (credential != null)
request.Credentials = credential;
if (!string.IsNullOrEmpty(proxyAddress))
{
IWebProxy proxy = new WebProxy(proxyAddress);
proxy.Credentials = new NetworkCredential();
request.Proxy = proxy;
}
if (!string.IsNullOrEmpty(data))
{
using (var swt = new StreamWriter(request.GetRequestStream()))
{
swt.Write(data);
}
}
string result = string.Empty;
using (WebResponse response = request.GetResponse())
{
if (response.ContentType.IndexOf("octet-stream") > -1)
{
string dispositionStr = response.Headers["Content-Disposition"];
int fileNameI = dispositionStr.IndexOf("filename=");
string fileName = dispositionStr.Substring(fileNameI + 9, dispositionStr.Length - (fileNameI + 9));
fileName = HttpUtility.UrlDecode(fileName, Encoding.UTF8);
string downpath = AppDomain.CurrentDomain.BaseDirectory + "Download";
if (!Directory.Exists(downpath)) {
Directory.CreateDirectory(downpath);
}
string downFile= downpath + "\\" + fileName;
if (File.Exists(downFile))
{
File.Delete(downFile);
}
Stream inStream = response.GetResponseStream();
using (Stream outStream = File.OpenWrite(downFile)) {
byte[] buffer = new byte[8192];
int size = 0;
while ((size = inStream.Read(buffer, 0, 8192)) > 0)
{
outStream.Write(buffer, 0, size);
}
}
result = downFile;
}
else {
Stream stream = response.GetResponseStream();
if (responseEncoding == null) responseEncoding = Encoding.UTF8;
StreamReader myStreamReader = new StreamReader(stream, responseEncoding);
result = myStreamReader.ReadToEnd();
myStreamReader.Close();
stream.Close();
//byte[] buf = new byte[1024];
//while (true)
//{
// int len = stream.Read(buf, 0, buf.Length);
// if (len <= 0)//len <= 0 跳出循环
// break;
// if (responseEncoding == null) responseEncoding = Encoding.UTF8;
// result += responseEncoding.GetString(buf, 0, len);//指定编码格式
//}
}
//using (var sr = new StreamReader(response.GetResponseStream()))
//{
// result = sr.ReadToEnd();
//}
}
return result;
}
/// <summary>
/// HttpWebRequest发送文件
/// </summary>
/// <param name="url">url</param>
/// <param name="fileName">文件路径</param>
/// <param name="fileParaName">文件参数名</param>
/// <param name="contentType">contentType</param>
/// <param name="nameValueCollection">其余要附带的参数键值对</param>
public static string RequestUploadFile(string url, byte[] buffer, string fileParaName, string fileName, NameValueCollection nameValueCollection, string contentType="application/octet-stream")
{
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.ContentType = "multipart/form-data; boundary=" + boundary;
request.Method = "POST";
request.KeepAlive = true;
request.Credentials = CredentialCache.DefaultCredentials;
Stream requestStream = request.GetRequestStream();
string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
if (nameValueCollection != null) {
foreach (string key in nameValueCollection.Keys)
{
requestStream.Write(boundarybytes, 0, boundarybytes.Length);
string formitem = string.Format(formdataTemplate, key, nameValueCollection[key]);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
requestStream.Write(formitembytes, 0, formitembytes.Length);
}
}
requestStream.Write(boundarybytes, 0, boundarybytes.Length);
string header = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n", fileParaName, fileName, contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
requestStream.Write(headerbytes, 0, headerbytes.Length);
//FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
//byte[] buffer = new byte[4096];
//int bytesRead = 0;
//while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
//{
// requestStream.Write(buffer, 0, bytesRead);
//}
//fileStream.Close();
requestStream.Write(buffer, 0, buffer.Length);
byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
requestStream.Write(trailer, 0, trailer.Length);
requestStream.Close();
WebResponse webResponse = null;
try
{
webResponse = request.GetResponse();
Stream responseStream = webResponse.GetResponseStream();
StreamReader streamReader = new StreamReader(responseStream);
string result = streamReader.ReadToEnd();
return result;
}
catch (Exception ex)
{
if (webResponse != null)
{
webResponse.Close();
webResponse = null;
}
}
finally
{
request = null;
}
return "";
}
private static bool RemoteCertificateValidate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
{
//为了通过证书验证，总是返回true
return true;
}
public static bool IsFileInUse(string fileName)
{
bool inUse = true;
FileStream fs = null;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read,
FileShare.None);
inUse = false;
}
catch
{
}
finally
{
if (fs != null)
fs.Close();
}
return inUse;//true表示正在使用,false没有使用
}
}
}
