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ashx一般处理程序使用HttpRequest发起HTTP请求

(2022-03-17 09:55:41)

//Get请求方式
https://www.cnblogs.com/Images/OutliningIndicators/None.gif     private string RequestGet(string Url)
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif    {
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif         string PageStr = string.Empty;//用于存放还回的html
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif         Uri url = new Uri(Url);//Uri类提供统一资源标识符 (URI) 的对象表示形式和对 URI 各部分的轻松访问。就是处理url地址
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif         try
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif        {
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             HttpWebRequest httprequest = (HttpWebRequest)WebRequest.Create(url);//根据url地址创建HTTpWebRequest对象
https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif            参数设置
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             HttpWebResponse response = (HttpWebResponse)httprequest.GetResponse();//使用HttpWebResponse获取请求的还回值
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             Stream steam = response.GetResponseStream();//从还回对象中获取数据流
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             StreamReader reader = new StreamReader(steam, Encoding.GetEncoding("gb2312"));//读取数据Encoding.GetEncoding("gb2312")指编码是gb2312，不让中文会乱码的
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             PageStr = reader.ReadToEnd();
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             reader.Close();
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif         }
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif         catch (Exception e)
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif        {
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif             PageStr += e.Message;
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif         }
https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif         return PageStr;
https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif     }

//post请求方式

//多个参数配置

private string RequestPost(string Url, IDictionary parameters)//两个参数分别是Url地址和Post过去的数据

{

string PageStr = string.Empty;

Uri url = new Uri(Url);

// byte[] reqbytes = Encoding.ASCII.GetBytes(Context);

byte[] reqbytes = Encoding.UTF8.GetBytes(BuildQuery(parameters, "utf8"));

try

{

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

req.Method = "post";

req.ContentType = "application/x-www-form-urlencoded;charset=utf-8";

// req.ContentType = "application/x-www-form-urlencoded";

req.ContentLength = reqbytes.Length;

Stream stm = req.GetRequestStream();

stm.Write(reqbytes, 0, reqbytes.Length);

stm.Close();

HttpWebResponse wr = (HttpWebResponse)req.GetResponse();

Stream stream = wr.GetResponseStream();

StreamReader srd = new StreamReader(stream, Encoding.GetEncoding("gb2312"));

PageStr += srd.ReadToEnd();

stream.Close();

srd.Close();

}

catch (Exception e)

{

PageStr += e.Message;

}

return PageStr;

}

Dictionary parameters = new Dictionary(); //参数列表

parameters.Add("studentID", studentID);

parameters.Add("expmID", expmID);

//组装请求参数

private string BuildQuery(IDictionary parameters, string encode)

{

StringBuilder postData = new StringBuilder();

bool hasParam = false;

IEnumerator> dem = parameters.GetEnumerator();

while (dem.MoveNext())

{

string name = dem.Current.Key;

string value = dem.Current.Value;

// 忽略参数名或参数值为空的参数

if (!string.IsNullOrEmpty(name))

{

if (hasParam)

{

postData.Append("&");

}

postData.Append(name);

postData.Append("=");

if (encode == "gb2312")

{

postData.Append(HttpUtility.UrlEncode(value, Encoding.GetEncoding("gb2312")));

}

else if (encode == "utf8")

{

postData.Append(HttpUtility.UrlEncode(value, Encoding.UTF8));

}

else

{

postData.Append(value);

}

hasParam = true;

}

return postData.ToString();

}

HttpContext.Current.Request.Url 地址：获取域名

假设当前页完整地址是：http://www.test.com/aaa/bbb.aspx?id=5&name=kelli

协议名----http://
域名 ---- www.test.com
站点名---aaa System.Web.HttpContext.Current.Request.ApplicationPath
页面名(文件名) ----bbb.aspx
参数------id=5&name=kelli

1、完整url （协议名+域名+站点名+文件名+参数）
string url=Request.Url.ToString();
url= http://www.test.com/aaa/bbb.aspx?id=5&name=kelli

2、站点名+页面名+参数
string url=Request.RawUrl;(或 string url=Request.Url.PathAndQuery;)
url= /aaa/bbb.aspx?id=5&name=kelli

3、站点名+页面名
string url=HttpContext.Current.Request.Url.AbsolutePath;
(或 string url= HttpContext.Current.Request.Path;)
url= aaa/bbb.aspx

4、域名
string url=HttpContext.Current.Request.Url.Host;
url= www.test.com

5、参数
string url= HttpContext.Current.Request.Url.Query;
url= ?id=5&name=kelli

6、站点名 System.Web.HttpContext.Current.Request.ApplicationPath

url协议+域名+端口号+站点名

string url = System.Web.HttpContext.Current.Request.Url.Scheme + "://" +
                        System.Web.HttpContext.Current.Request.Url.Host + ":" +
                        System.Web.HttpContext.Current.Request.Url.Port +

                            System.Web.HttpContext.Current.Request.ApplicationPath;

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