POST GET原理函数
一、C#客户端通过POST或GET向指定的网址发送数据
发送请求
/// <summary>
/// 发送请求
/// </summary>
/// <param name="url">网址</param>
/// <param name="parameter">要发送的值。如：abc=4&bcd=5</param>
/// <param name="method">发送的方式，“POST”还是“GET”</param>
/// <returns>返回的结果</returns>
public static string RequestUrl(string url, string parameter, string method)
{
try
{
HttpWebRequest hwrq = null;
if (method == "POST")
{
hwrq = (HttpWebRequest)HttpWebRequest.Create(url);
hwrq.KeepAlive = false;
hwrq.ReadWriteTimeout = 10000;
//hwrq.CookieContainer = cc;
hwrq.Method = method;
byte[] postData = System.Text.Encoding.UTF8.GetBytes(parameter);
hwrq.ContentType = "application/x-www-form-urlencoded";
hwrq.ContentLength = postData.Length;
Stream writeStream = hwrq.GetRequestStream();
writeStream.Write(postData, 0, postData.Length);
writeStream.Close();
}
else if (method == "GET")
{
hwrq = (HttpWebRequest)HttpWebRequest.Create(url + "?" + System.Web.HttpUtility.UrlEncode(parameter));
hwrq.KeepAlive = false;
//hwrq.CookieContainer = cc;
hwrq.Method = method;
}
if (hwrq != null)
{
HttpWebResponse hwrp = (HttpWebResponse)hwrq.GetResponse();
//return hwrp.ResponseUri.AbsoluteUri;
StreamReader sr = new StreamReader(hwrp.GetResponseStream(), Encoding.Default);
return sr.ReadToEnd();
}
}
catch (Exception ex)
{
throw ex;
}
return null;
}
二、邮件发送函数
邮件发送
/// <summary>
/// 发送邮件
/// </summary>
/// <param name="strSmtpServer">Smtp地址</param>
/// <param name="strFrom">发送方的邮件地址</param>
/// <param name="strFromPass">发送方的邮件密码</param>
/// <param name="strto">接受方的邮件地址</param>
/// <param name="strSubject">邮件主题</param>
/// <param name="strBody">邮件内容，支持html</param>
/// <param name="Attachments">附件列表</param>
/// <returns>成功与否</returns>
public static bool SendSMTPEMail(string strSmtpServer, string strFrom, string strFromPass, string strto, string strSubject, string strBody, string[] Attachments)
{
System.Net.Mail.SmtpClient client = null;
System.Net.Mail.MailMessage message = null;
try
{
client = new SmtpClient();
client.Host = System.Net.Dns.GetHostAddresses(strSmtpServer)[0].ToString();
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential(strFrom, strFromPass);
//星号改成自己邮箱的密码
client.DeliveryMethod = SmtpDeliveryMethod.Network;
message = new MailMessage(strFrom, strto);
message.Subject = strSubject;
message.Body = strBody;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = true;
//添加附件
foreach (string forStr in Attachments)
{
Attachment data = new Attachment(forStr, System.Net.Mime.MediaTypeNames.Application.Octet);
message.Attachments.Add(data);
}
client.Send(message);
}
catch (Exception ex)
{
using (System.IO.StreamWriter sw = new System.IO.StreamWriter(Directory.GetCurrentDirectory().TrimEnd('\\') + "http://www.cnblogs.com/JackieYang/admin/file://Log.txt/", true, Encoding.UTF8))
{
sw.Write("发送邮件出错!\n" + ex.Message + "\n" + ex.StackTrace + "\n===========================\n");
}
return false;
}
finally
{
if (message != null)
{
foreach (Attachment forData in message.Attachments)
forData.Dispose();
message.Attachments.Clear();
message.Dispose();
}
}
return true;
}
三：HttpWebRequest 对象和 HttpWebResponse 对象介绍：
在.NET的基本类型库类中提供了两个对象类：HTTPWebRequest和HTTPWebResponse，分别用来向某资源发送请求和获得响应。为了得到一个资源的内容，我们先指定一个想要抓取的URL地址，用C# HTTPWebRequest对象进行请求，用HTTPWebResponse对象接收响应的结果，最后用TextStream对象来提取我们想要的信息，并在控制台打印出来。
using System.IO;
using System.Net;
using System.Text;
private void button1_Click(object sender, System.EventArgs e)
{
byte[] buf = new byte[38192];
HttpWebRequest request = (HttpWebRequest)
WebRequest.Create(textBox1.Text);
HttpWebResponse response = (HttpWebResponse)
request.GetResponse();
Stream resStream = response.GetResponseStream();
int count = resStream.Read(buf, 0, buf.Length);
textBox2.Text = Encoding.Default.GetString(buf, 0,
count);
resStream.Close();
}
上面的这个程序的功能是抓取网页http://lucky.myrice.com/down.htm的内容，并在多行文本框里显示出HTML代码，由于返回的数据是字节类型的，因此，我们创建一个名为buf的字节类型的数组变量来存储请求返回来的结果，其中数组的大小与我们要请求返回的数据大小有关系。首先，我们实例化C# HTTPWebRequest对象，使用WebRequest类的静态方法Create()，该方法的字符串参数就是我们要请求页面的URL地址，由于Create()方法返回的是WebRequest类型的，我们必须对它进行造型（即类型转换）类型，成HttpWebRequest再赋给request变量。一旦我们建立了C# HTTPWebRequest对象，就可以使用它的GetResponse()方法来返回一个WebResponse对象，然后再造型成HttpWebResponse对象赋给response变量。现在，就可以使用response对象的GetResponseStream()方法来得到响应的文本流了，最后用Stream对象的Read()方法把返回的响应信息放到我们最初创建的字节数组buf中，Read()有3个参数，分别是：要放入的字节数组，字节数组的开始位置，字节数组的长度。最后把字节转换成字符串，注意：这里采用的采用的是Default编码，它使用默认的编码方式，我们就不用再进行字符编码之间的转换了。
