ASP.NET 使用WebRequest和WebResponse抽象类获取 Internet 页面代码

主要是熟悉一下 WebRequest  和 WebResponse两个类 ，这2个类对应还有HttpWebRequest 和 HttpWebResponse两个类。

using System.IO;
using System.Text;
using System.Net;
        protected void Button2_Click(object sender, EventArgs e)
        {
            Encoding ed = Encoding.GetEncoding("GB2312"); //创建一个字符串编码
            StreamReader sr = null; //读取流
            StreamWriter sw = null; //写入流
            string str = string.Empty; //空字符串

            try
            {
                WebRequest wr = WebRequest.Create(this.TextBox3.Text.Trim()); //向指定的URI（http://或File://）发送请求
                WebResponse ws = wr.GetResponse(); //通过WebRequest的GetResponse()方法来创建实例（响应WebRequest的请求）

                Stream sm = ws.GetResponseStream(); //从WebResponse的GetResponseStream()方法中创建文本流实例
                sr = new StreamReader(sm, ed); //以指定的编码方式加载文本流;
                str = sr.ReadToEnd(); //将文本流从头到尾所有字符串赋值给字符串变量
                //Response.Write(str); //----- 测试用 -----

                string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".htm"; //新建文件名格式

                sw = new StreamWriter(Server.MapPath("Html/") + fileName, false, ed);
                Response.Write("成功生成URL<a href=\"Html/" + fileName + "\" target=\"_blank\">" + fileName + "</a>文件！");
                sw.Write(str);
                sw.Flush();
                sm.Close();
                ws.Close();
            }
            catch (Exception Error)
            {
                throw Error;
            }
            finally
            {
                sr.Close();
                sw.Close();
            }
        }

前端代码

 <form id="form1" runat="server">
    <div>
    
        <table class="style1">
            <tr>
                <td colspan="2"><asp:TextBox ID="TextBox3" runat="server" Width="330"></asp:TextBox>
                &nbsp;
                <asp:Button ID="Button2" runat="server" Text="URL 提交" onclick="Button2_Click" /></td>
            </tr>
        </table>
    
    </div>
    </form>

转自：http://cache.baidu.com/c?m=9d78d513d99000ed4fece4690d61c0676908d7252bd7a1502884d31fd0230c000172a4fb792d4a4295876b6672b25419afb52172404777f7d099de5dddccc375709572742d5bc4000fc41fad9e4720c322915ef4aa1ae4bcf53484aea5958216089b&p=8b2a91118a8733ea1dbd9b79075c&user=baidu&fm=sc&query=asp%2Enet+webrequest&qid=b0a9b247391c898c&p1=7