C#模拟http 发送post或get请求的简单实例
privatestringHttpPost(stringUrl,stringpostDataStr) { HttpWebRequestrequest=(HttpWebRequest)WebRequest.Create(Url); request.Method="POST"; request.ContentType="application/x-www-form-urlencoded"; request.ContentLength=Encoding.UTF8.GetByteCount(postDataStr); request.CookieContainer=cookie; StreammyRequestStream=request.GetRequestStream(); StreamWritermyStreamWriter=newStreamWriter(myRequestStream,Encoding.GetEncoding("gb2312")); myStreamWriter.Write(postDataStr); myStreamWriter.Close(); HttpWebResponseresponse=(HttpWebResponse)request.GetResponse(); response.Cookies=cookie.GetCookies(response.ResponseUri); StreammyResponseStream=response.GetResponseStream(); StreamReadermyStreamReader=newStreamReader(myResponseStream,Encoding.GetEncoding("utf-8")); stringretString=myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); returnretString; } publicstringHttpGet(stringUrl,stringpostDataStr) { HttpWebRequestrequest=(HttpWebRequest)WebRequest.Create(Url+(postDataStr==""?"":"?")+postDataStr); request.Method="GET"; request.ContentType="text/html;charset=UTF-8"; HttpWebResponseresponse=(HttpWebResponse)request.GetResponse(); StreammyResponseStream=response.GetResponseStream(); StreamReadermyStreamReader=newStreamReader(myResponseStream,Encoding.GetEncoding("utf-8")); stringretString=myStreamReader.ReadToEnd(); myStreamReader.Close(); myResponseStream.Close(); returnretString; }
在post的时候有时也用的到cookie,像登录163发邮件时候就需要发送cookie,所以在外部一个cookie属性随时保存CookieContainercookie=newCookieContainer();
注意:有时候请求会重定向,但我们就需要从重定向url获取东西,像QQ登录成功后获取sid,但上面的会自动根据重定向地址跳转。我们可以用:
request.AllowAutoRedirect=false;设置重定向禁用,你就可以从headers的Location属性中获取重定向地址
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