C# HTTP编程

目的：主要解决中文问题

 

说明：

1.GET方式中文包括在URL中可以正常得到；

2.POST方式注意两点关键：

（1）对URL中除了"="以外的中文进行URLENCOE处理；

string data = "u="; Encoding myEncoding = Encoding.GetEncoding("utf-8"); data += HttpUtility.UrlEncode("中文", myEncoding);

（2）得到URLENCODE处理后的数据得到ASCII字节数据。

byte[] data = Encoding.ASCII.GetBytes(postData);

 

代码：

一、请求端

1、前台

private void button1_Click(object sender, EventArgs e) { label1.Text = "Reading..."; string err; string data = "u="; Encoding myEncoding = Encoding.GetEncoding("utf-8"); data += HttpUtility.UrlEncode("uu", myEncoding); textBox1.Text = GetRemotPages.GetPage("http://localhost:3232/Default.aspx", data, out err); label1.Text = "End."; if (err != null && err!="") { MessageBox.Show(err); } } private void button2_Click(object sender, EventArgs e) { label1.Text = "Reading..."; string err; string data = "u1=中文"; textBox1.Text = GetRemotPages.GetPageByGet("http://localhost:3232/Default.aspx?" + data, out err); label1.Text = "End."; if (err != null && err!="") { MessageBox.Show(err); } }

2、后台类

/// <summary> /// 如果多个请求（WebRequest）使用的是同是个CookieContainer，请求时可维持Session的，实现“登录-->获取”操作 /// </summary> public static class GetRemotPages { public static string GetPage(string url, string postData, out string err) { CookieContainer cc = new CookieContainer(); err = ""; Stream outstream = null; Stream instream = null; StreamReader sr = null; HttpWebResponse response = null; HttpWebRequest request = null; byte[] data = Encoding.ASCII.GetBytes(postData); // 准备请求... try { // 设置参数 request = WebRequest.Create(url) as HttpWebRequest; request.CookieContainer = cc; request.AllowAutoRedirect = true; request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = data.Length; outstream = request.GetRequestStream(); outstream.Write(data, 0, data.Length); outstream.Close(); //发送请求并获取相应回应数据 response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求 instream = response.GetResponseStream(); Encoding encoding = Encoding.GetEncoding("gb2312"); sr = new StreamReader(instream, encoding); //返回结果网页（html）代码 string content = sr.ReadToEnd(); err = string.Empty; return content; } catch (Exception ex) { err = ex.Message; return string.Empty; } } public static string GetPageByGet(string url,out string err) { CookieContainer cc = new CookieContainer(); HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; request.CookieContainer = cc; request.Method="GET"; try { using (WebResponse wr = request.GetResponse()) { Stream instream = wr.GetResponseStream(); Encoding encoding = Encoding.GetEncoding("gb2312"); StreamReader sr = new StreamReader(instream, encoding); err = string.Empty; return sr.ReadToEnd(); } } catch (Exception ex) { err = ex.Message; return string.Empty; } } }

 

二、接收端

protected void Page_Load(object sender, EventArgs e) { string dd=Request.Form["u"]; string dd1 = Request.QueryString["u1"]; Response.Write(dd); }

作者：[e-mail] 敖士伟