The method of getting html pages submitted by post
This article mainly introduces the relevant knowledge of the method of post submission to obtain html page, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe that you will have something to gain after reading this post submission to get the html page. Let's take a look at it.
/ the html source code of the page is mainly used to obtain the source code / publicstaticstringGetPageHTML (stringurl) when generating static files in the background.
{
StringhttpString=string.Empty
WebRequestrequest=WebRequest.Create (url)
Request.Timeout=200000
Using (HttpWebResponseresponse= (HttpWebResponse) request.GetResponse ())
{
If (response.StatusDescription.ToLower () .Equals ("ok")
{
Using (StreamReaderwriter=newStreamReader (response.GetResponseStream (), Encoding.GetEncoding ("GB2312")
{
HttpString=writer.ReadToEnd ()
}
}
}
ReturnhttpString
}
/ the html source code of the page is mainly used to obtain the source code UTF-8/publicstaticstringGetPageHTMLUTF8 (stringurl) when generating static files in the background.
{
StringhttpString=string.Empty
WebRequestrequest=WebRequest.Create (url)
Request.Timeout=200000
Using (HttpWebResponseresponse= (HttpWebResponse) request.GetResponse ())
{
If (response.StatusDescription.ToLower () .Equals ("ok")
{
Using (StreamReaderwriter=newStreamReader (response.GetResponseStream (), Encoding.GetEncoding ("UTF-8")
{
HttpString=writer.ReadToEnd ()
}
}
}
ReturnhttpString
}
/ post submits JSON data. Supports .net4.0 and below / publicstaticstringGetHtmlByJson (stringurl,stringjson= "")
{
Varresult=string.Empty
Try {
Varrequest=WebRequest.Create (url) asHttpWebRequest
Request.ContentType= "text/json"
Request.Method= "post"
/ / request.CookieContainer=_cookie
Using (varstreamWriter=newStreamWriter (request.GetRequestStream ()
{
StreamWriter.Write (json)
StreamWriter.Flush ()
StreamWriter.Close ()
Varresponse= (HttpWebResponse) request.GetResponse ()
Using (varreader=newStreamReader (response.GetResponseStream ()
{
Result=reader.ReadToEnd ()
}
}
}
Catch (UriFormatExceptionuex)
{
/ / error handling}
Returnresult
}
/ utilize WebClient remote POST data and return data / remote URL address / / parameter, JSON string / POST data encoding / get the data encoding / publicstaticstringPostData (stringstrUrl,stringstrParams,EncodingRespEncode,EncodingReqEncode)
{
/ * this function only supports framework HttpClienthttpclient=newHttpClient () above .net4.5; try {/ / Open the page httpclient.Credentials=CredentialCache.DefaultCredentials;// to download the resource byte [] responseData=httpclient.DownloadData (strUrl) from the specified URI; stringsrcString=RespEncode.GetString (responseData)
Httpclient.Headers.Add ("Content-Type", "application/x-www-form-urlencoded"); stringpostString=strParams;// converts a string into a byte array byte [] postData=Encoding.ASCII.GetBytes (postString); / / uploads data and returns the byte array responseData=httpclient.UploadData (strUrl, "POST", postData) of the page; srcString=ReqEncode.GetString (responseData)
ReturnsrcString;} catch (Exceptionex) {/ / record exception log / / release resource httpclient.Dispose (); returnstring.Empty;} * / return ""
}
/ execute POST submission example / "LoginName=365admin&Password=fob123" / publicstaticstringPostPageHTMLUTF8 (stringurl,stringpostdata)
{
WebClientclient=newWebClient ()
System.Collections.Specialized.NameValueCollectionlist=newSystem.Collections.Specialized.NameValueCollection ()
List.Add ("opencheckindatatype", "3")
List.Add ("starttime", "1492617600")
List.Add ("endtime", "1492790400")
/ / "useridlist": ["james", "paul"] list.Add ("useridlist", "['TuHuaXing']")
Byte [] j=client.UploadValues (url,list)
/ / vardec=BitConverter.ToInt64 (jjj0); / / stringjS=BitConverter.ToString (j); / / jS=Convert.ToString (jS,10); returnSystem.Text.Encoding.Default.GetString (j)
/ / get the value request.form on the target page ["id"]
/ * * WebRequestrequest7=WebRequest.Create (url); request7.Method= "POST"
/ / post pass parameters byte [] bytes=Encoding.ASCII.GetBytes (postdata); request7.ContentType= "application/x-www-form-urlencoded"; request7.ContentLength=postdata.Length;request7.SStreamsendStream=request7.GetRequestStream (); sendStream.Write (bytes,0,bytes.Length); sendStream.Close ()
/ / get the return value WebResponseresponse7=request7.GetResponse (); stringOrderQuantity=newStreamReader (response7.GetResponseStream (), Encoding.GetEncoding ("utf-8")) .ReadToEnd (); returnOrderQuantity;// is converted to json object processing / / ListgetOrderQuantity=sr.Deserialize (OrderQuantity); * * /}
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