http 的get，post方式访问url

public string Post_Http(string url, string postData)
{
string strResult = "";
try
{
//将字符串参数 转换成字节数组 便于写入流
byte[] byteData = Encoding.GetEncoding("utf-8").GetBytes(postData);
//创建请求实例
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);
//设置请求方式
myRequest.Method = "POST";

//设置所发送的请求数据的内容类型
myRequest.ContentType = "application/x-www-form-urlencoded";
//设置所发送的请求数据的内容长度。
myRequest.ContentLength = byteData.Length;
//获得请求的流
Stream requestStream = myRequest.GetRequestStream();
//将内容写入请求流
requestStream.Write(byteData, 0, byteData.Length);
requestStream.Close();

//得到请求相应的内容
HttpWebResponse HttpWResp = (HttpWebResponse)myRequest.GetResponse();
//将得到的数据写入stream中
Stream streamResp = HttpWResp.GetResponseStream();
// 初始化一个读取的文件流对象
StreamReader sr = new StreamReader(streamResp, Encoding.UTF8);
StringBuilder strBuilder = new StringBuilder();
//读取数据
while (-1 != sr.Peek())
{
strBuilder.Append(sr.ReadLine());
}

strResult = strBuilder.ToString();
HttpWResp.Close();
sr.Close();

}
catch (Exception ee)
{
strResult = ee.Message;
}
return strResult;
} 

2.get方式

public string Get_Http(string tUrl)
{
string strResult;
try
{
//实例化WebRequest对象 静态
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(tUrl);
hwr.Method = "GET";
//设置请求前超时前的时间长度 毫秒
hwr.Timeout = 20000; //20s

//重写，返回对 Internet 请求的响应。 hwr
HttpWebResponse hwrs = (HttpWebResponse)hwr.GetResponse();
//返回用于将数据写入 Internet 资源的 System.IO.Stream。
Stream myStream = hwrs.GetResponseStream();
//初始化一个流对象并 设置初始化时的编码格式
StreamReader sr = new StreamReader(myStream, Encoding.UTF8);
StringBuilder sb = new StringBuilder();
//判断是否有值 -1没有
while (-1 != sr.Peek())
{
// 从当前流中读取一行并将数据作为字符串返回。ReadLine()
//追加到StringBuilder上
sb.Append(sr.ReadLine() + "\r\n");
}
strResult = sb.ToString();
//关闭对象
sr.Close();
hwrs.Close();
}
catch (Exception ee)
{
strResult = ee.Message;
}
//返回结果
return strResult;
}