1 public class HttpHelper
2 {
3 /// <summary>
4 /// HttpWebRequest 通过Post
5 /// </summary>
6 /// <param name="url">URI</param>
7 /// <param name="postData">post数据</param>
8 /// <returns></returns>
9 public static string PostDataGetHtml(string url, string postData)
10 {
11 try
12 {
13 byte[] data = Encoding.UTF8.GetBytes(postData);
14
15 Uri uri = new Uri(url);
16 HttpWebRequest req = WebRequest.Create(uri) as HttpWebRequest;
17 if (req == null)
18 {
19 return "Network error:" + new ArgumentNullException("httpWebRequest").Message;
20 }
21 req.Method = "POST";
22 req.KeepAlive = true;
23 req.ContentType = "application/x-www-form-urlencoded";
24 req.ContentLength = data.Length;
25 req.AllowAutoRedirect = true;
26
27 Stream outStream = req.GetRequestStream();
28 outStream.Write(data, 0, data.Length);
29 outStream.Close();
30
31 var res = req.GetResponse() as HttpWebResponse;
32 if (res == null)
33 {
34 return "Network error:" + new ArgumentNullException("HttpWebResponse").Message;
35 }
36 Stream inStream = res.GetResponseStream();
37 var sr = new StreamReader(inStream, Encoding.UTF8);
38 string htmlResult = sr.ReadToEnd();
39
40 return htmlResult;
41 }
42 catch (Exception ex)
43 {
44 return "网络错误(Network error)：" + ex.Message;
45 }
46 }
47
48 /// <summary>
49 /// HttpWebRequest 通过get
50 /// </summary>
51 /// <param name="url">URI</param>
52 /// <returns></returns>
53 public static string GetDataGetHtml(string url)
54 {
55 try
56 {
57 HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
58
59 httpWebRequest.ContentType = "application/x-www-form-urlencoded";
60 httpWebRequest.Method = "GET";
61 //对发送的数据不使用缓存
62 httpWebRequest.AllowWriteStreamBuffering = false;
63 httpWebRequest.Timeout = 300000;
64 httpWebRequest.ServicePoint.Expect100Continue = false;
65
66 HttpWebResponse webRespon = (HttpWebResponse)httpWebRequest.GetResponse();
67 Stream webStream = webRespon.GetResponseStream();
68 if (webStream == null)
69 {
70 return "网络错误(Network error)：" + new ArgumentNullException("webStream");
71 }
72 StreamReader streamReader = new StreamReader(webStream, Encoding.UTF8);
73 string responseContent = streamReader.ReadToEnd();
74
75 webRespon.Close();
76 streamReader.Close();
77
78 return responseContent;
79 }
80 catch (Exception ex)
81 {
82 return "网络错误(Network error)：" + ex.Message;
83 }
84 }
85
86 /// <summary>
87 /// HttpWebRequest 通过get
88 /// </summary>
89 /// <param name="url">URI</param>
90 /// <returns></returns>
91 public static bool GetDataGetHtml(string url, string filePath, ref string mg)
92 {
93 try
94 {
95 HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
96
97 httpWebRequest.ContentType = "application/x-www-form-urlencoded";
98 httpWebRequest.Method = "GET";
99 //对发送的数据不使用缓存
100 httpWebRequest.AllowWriteStreamBuffering = false;
101 httpWebRequest.Timeout = 300000;
102 httpWebRequest.ServicePoint.Expect100Continue = false;
103
104 HttpWebResponse webRespon = (HttpWebResponse)httpWebRequest.GetResponse();
105 Stream webStream = webRespon.GetResponseStream();
106 if (webStream == null)
107 {
108 return false;
109 }
110 StreamReader streamReader = new StreamReader(webStream, Encoding.UTF8);
111 string responseContent = streamReader.ReadToEnd();
112 mg = responseContent;
113 webRespon.Close();
114 streamReader.Close();
115 if (responseContent.ToUpper().IndexOf("NULL") > -1)
116 {
117 return false;
118 }
119 else
120 {
121 FileStream fs = new FileStream(filePath, FileMode.Create);
122 var buff = Encoding.UTF8.GetBytes(responseContent);
123 fs.Write(buff, buff.Length, 0);
124 fs.Close();
125 return true;
126 }
127 }
128 catch (Exception ex)
129 {
130 return false;
131 }
132 }
133
134 /// <summary>
135 /// 将本地文件上传到指定的服务器(HttpWebRequest方法)
136 /// </summary>
137 /// <param name="address">文件上传到的服务器</param>
138 /// <param name="fileNamePath">要上传的本地文件（全路径）</param>
139 /// <param name="saveName">文件上传后的名称</param>
140 /// <returns>成功返回1，失败返回0</returns>
141 public static int Upload_Request(string address, string fileNamePath, string saveName)
142 {
143 // 要上传的文件
144 try
145 {
146 if (!File.Exists(fileNamePath))
147 {
148 return 0;
149 }
150 FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
151 return Upload_Request(address, fs, saveName);
152 }
153 catch (Exception ex)
154 {
155 return 0;
156 }
157 }
158
159 /// <summary>
160 /// 将本地文件流上传到指定的服务器(HttpWebRequest方法)
161 /// </summary>
162 /// <param name="address">文件上传到的服务器</param>
163 /// <param name="fileStream">要上传的本地文件流</param>
164 /// <param name="saveName">文件上传后的名称</param>
165 /// <returns>成功返回1，失败返回0</returns>
166 public static int Upload_Request(string address, Stream fileStream, string saveName)
167 {
168 int returnValue = 0;
169 fileStream.Position = 0;
170 var r = new BinaryReader(fileStream);
171 //时间戳
172 string strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");
173 byte[] boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");
174 //请求头部信息
175 StringBuilder sb = new StringBuilder();
176 sb.Append("--");
177 sb.Append(strBoundary);
178 sb.Append("\r\n");
179 sb.Append("Content-Disposition: form-data; name=\"");
180 sb.Append("file");
181 sb.Append("\"; filename=\"");
182 sb.Append(saveName);
183 sb.Append("\"");
184 sb.Append("\r\n");
185 sb.Append("Content-Type: ");
186 sb.Append("application/octet-stream");
187 sb.Append("\r\n");
188 sb.Append("\r\n");
189 string strPostHeader = sb.ToString();
190 byte[] postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);
191 try
192 {
193 // 根据uri创建HttpWebRequest对象
194 HttpWebRequest httpReq = (HttpWebRequest)WebRequest.Create(new Uri(address));
195 httpReq.Method = "POST";
196 //对发送的数据不使用缓存
197 httpReq.AllowWriteStreamBuffering = false;
198 //设置获得响应的超时时间（300秒）
199 httpReq.Timeout = 300000;
200 httpReq.ServicePoint.Expect100Continue = false;
201 httpReq.ContentType = "multipart/form-data; boundary=" + strBoundary;
202 long length = fileStream.Length + postHeaderBytes.Length + boundaryBytes.Length;
203 long fileLength = fileStream.Length;
204 httpReq.ContentLength = length;
205 byte[] buffer = new byte[fileLength];
206 Stream postStream = httpReq.GetRequestStream();
207 //发送请求头部消息
208 postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
209 int size = r.Read(buffer, 0, buffer.Length);
210 postStream.Write(buffer, 0, size);
211 //添加尾部的时间戳
212 postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
213 postStream.Close();
214 //获取服务器端的响应
215 HttpWebResponse webRespon = (HttpWebResponse)httpReq.GetResponse();
216 if (webRespon.StatusCode == HttpStatusCode.OK) //如果服务器未响应，那么继续等待相应
217 {
218 Stream s = webRespon.GetResponseStream();
219 StreamReader sr = new StreamReader(s);
220 //读取服务器端返回的消息
221 String sReturnString = sr.ReadLine();
222 s.Close();
223 sr.Close();
224 fileStream.Close();
225 if (sReturnString == "Success")
226 {
227 returnValue = 1;
228 }
229 else
230 {
231 returnValue = 0;
232 }
233 }
234 }
235 catch (Exception ex)
236 {
237 returnValue = 0;
238 }
239 return returnValue;
240 }
241
242 /// <summary>
243 /// 将本地文件上传到指定服务器上（HttpWebRequest方法），并传递相应参数
244 /// </summary>
245 /// <param name="url">文件上传到的服务器</param>
246 /// <param name="fileKeyName">类型（此处为文件--file）</param>
247 /// <param name="filePath">要上传的本地文件（全路径）</param>
248 /// <param name="filename">文件上传后的名称</param>
249 /// <param name="stringDict">参数集合</param>
250 /// <param name="timeOut">请求时效</param>
251 /// <returns></returns>
252 public static string HttpPostData(string url, string fileKeyName, string filePath, string filename, NameValueCollection stringDict, int timeOut = 900000)
253 {
254 string responseContent;
255 try
256 {
257 var memStream = new MemoryStream();
258 var webRequest = (HttpWebRequest)WebRequest.Create(url);
259 // 边界符
260 var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
261 // 边界符
262 var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "\r\n");
263 var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
264 // 最后的结束符
265 var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");
266
267 // 设置属性
268 webRequest.Method = "POST";
269 webRequest.Timeout = timeOut;
270 webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
271
272 // 写入文件
273 const string filePartHeader = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" + "Content-Type: application/octet-stream\r\n\r\n";
274 var header = string.Format(filePartHeader, fileKeyName, filename);
275 var headerbytes = Encoding.UTF8.GetBytes(header);
276
277 memStream.Write(beginBoundary, 0, beginBoundary.Length);
278 memStream.Write(headerbytes, 0, headerbytes.Length);
279
280 var buffer = new byte[1024];
281 int bytesRead; // =0
282
283 while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
284 {
285 memStream.Write(buffer, 0, bytesRead);
286 }
287
288 // 写入字符串的Key
289 var stringKeyHeader = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"" + "\r\n\r\n{1}\r\n";
290
291 foreach (byte[] formitembytes in from string key in stringDict.Keys select string.Format(stringKeyHeader, key, stringDict[key]) into formitem select Encoding.UTF8.GetBytes(formitem))
292 {
293 memStream.Write(formitembytes, 0, formitembytes.Length);
294 }
295
296 // 写入最后的结束边界符
297 memStream.Write(endBoundary, 0, endBoundary.Length);
298
299 webRequest.ContentLength = memStream.Length;
300
301 var requestStream = webRequest.GetRequestStream();
302
303 memStream.Position = 0;
304 var tempBuffer = new byte[memStream.Length];
305 memStream.Read(tempBuffer, 0, tempBuffer.Length);
306 memStream.Close();
307
308 requestStream.Write(tempBuffer, 0, tempBuffer.Length);
309 requestStream.Close();
310
311 var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
312
313 using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("utf-8")))
314 {
315 responseContent = httpStreamReader.ReadToEnd();
316 }
317
318 fileStream.Close();
319 httpWebResponse.Close();
320 webRequest.Abort();
321 }
322 catch (Exception ex)
323 {
324 responseContent = ex.Message;
325 }
326 return responseContent;
327 }
328
329 /// <summary>
330 /// Http下载文件支持断点续传
331 /// </summary>
332 /// <param name="uri">下载地址</param>
333 /// <param name="filefullpath">存放完整路径（含文件名）</param>
334 /// <param name="size">每次多的大小</param>
335 /// <returns>下载操作是否成功</returns>
336 public static bool HttpDownLoadFiles(string uri, string filefullpath, int size = 1024)
337 {
338 try
339 {
340 string fileDirectory = System.IO.Path.GetDirectoryName(filefullpath);
341 if (!Directory.Exists(fileDirectory))
342 {
343 Directory.CreateDirectory(fileDirectory);
344 }
345 string fileFullPath = filefullpath;
346 string fileTempFullPath = filefullpath + ".tmp";
347
348 if (File.Exists(fileFullPath))
349 {
350 return true;
351 }
352 else
353 {
354 if (File.Exists(fileTempFullPath))
355 {
356 FileStream fs = new FileStream(fileTempFullPath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);
357
358 byte[] buffer = new byte[512];
359 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
360
361 request.Timeout = 10000;
362 request.AddRange((int)fs.Length);
363
364 Stream ns = request.GetResponse().GetResponseStream();
365
366 long contentLength = request.GetResponse().ContentLength;
367
368 int length = ns.Read(buffer, 0, buffer.Length);
369
370 while (length > 0)
371 {
372 fs.Write(buffer, 0, length);
373
374 buffer = new byte[512];
375
376 length = ns.Read(buffer, 0, buffer.Length);
377 }
378
379 fs.Close();
380 File.Move(fileTempFullPath, fileFullPath);
381 }
382 else
383 {
384 FileStream fs = new FileStream(fileTempFullPath, FileMode.Create);
385
386 byte[] buffer = new byte[512];
387 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
388 request.Timeout = 10000;
389 request.AddRange((int)fs.Length);
390
391 Stream ns = request.GetResponse().GetResponseStream();
392
393 long contentLength = request.GetResponse().ContentLength;
394
395 int length = ns.Read(buffer, 0, buffer.Length);
396
397 while (length > 0)
398 {
399 fs.Write(buffer, 0, length);
400
401 buffer = new byte[512];
402
403 length = ns.Read(buffer, 0, buffer.Length);
404 }
405
406 fs.Close();
407 File.Move(fileTempFullPath, fileFullPath);
408 }
409 return true;
410 }
411 }
412 catch (Exception ex)
413 {
414 return false;
415 }
416 }
417
418 /// <summary>
419 /// Http下载文件
420 /// </summary>
421 /// <param name="uri">下载地址</param>
422 /// <param name="filefullpath">存放完整路径（含文件名）</param>
423 /// <param name="size">每次多的大小</param>
424 /// <returns>下载操作是否成功</returns>
425 public static bool DownLoadFiles(string uri, string filefullpath, int size = 1024)
426 {
427 try
428 {
429 if (File.Exists(filefullpath))
430 {
431 try
432 {
433 File.Delete(filefullpath);
434 }
435 catch (Exception ex)
436 {
437 return false;
438 }
439 }
440 string fileDirectory = System.IO.Path.GetDirectoryName(filefullpath);
441 if (!Directory.Exists(fileDirectory))
442 {
443 Directory.CreateDirectory(fileDirectory);
444 }
445 FileStream fs = new FileStream(filefullpath, FileMode.Create);
446 byte[] buffer = new byte[size];
447 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
448 request.Timeout = 10000;
449 request.AddRange((int)fs.Length);
450
451 Stream ns = request.GetResponse().GetResponseStream();
452
453 long contentLength = request.GetResponse().ContentLength;
454
455 int length = ns.Read(buffer, 0, buffer.Length);
456
457 while (length > 0)
458 {
459 fs.Write(buffer, 0, length);
460
461 buffer = new byte[size];
462
463 length = ns.Read(buffer, 0, buffer.Length);
464 }
465 fs.Close();
466 return true;
467 }
468 catch (Exception ex)
469 {
470 return false;
471 }
472 }
473 }
标签：Http,string,C#,return,访问,Length,buffer,HttpWebRequest,new From： https://www.cnblogs.com/lgx5/p/18306775