• POST发送请求及接受响应流程
  1. 根据目标地址址创建HttpWebRequest对象
  2. 设置响应的请求参数——Method、ContentType 等
  3. 使用HttpWebRequest对象获取请求流并且写入消息体
  4. 使用HttpWebRequest对象获取响应流并读取流中数据(在获取过程中就是发送请求并接受响应)
  • GET发送请求及接受响应流程
  1. 把目标地址和查询字符串拼接在一起(如果有查询字符串)使用拼接的字符串创建HttpWebRequest对象
  2. 设置响应的请求参数——Method、ContentType 等
  3. 使用HttpWebRequest对象获取响应流并读取流中数据(在获取过程中就是发送请求并接受响应)

以下为代码：

两个请求方法 和读取方法

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/// 发送http post请求

public HttpWebResponse CreatePostHttpResponse(string url, IDictionary<string, string> parameters)
{
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;//创建请求对象
request.Method = "POST";//请求方式
request.ContentType = "application/x-www-form-urlencoded";//链接类型
//构造查询字符串
if (!(parameters == null || parameters.Count == 0))
{
StringBuilder buffer = new StringBuilder();
bool first = true;
foreach (string key in parameters.Keys)
{

if (!first)
{
buffer.AppendFormat("&{0}={1}", key, parameters[key]);
}
else
{
buffer.AppendFormat("{0}={1}", key, parameters[key]);
first = false;
}
}
byte[] data = Encoding.UTF8.GetBytes(buffer.ToString());
//写入请求流
using (Stream stream = request.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
}
return request.GetResponse() as HttpWebResponse;
}

/// 发送http Get请求

public static HttpWebResponse CreateGetHttpResponse(string url)
{
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";//链接类型
return request.GetResponse() as HttpWebResponse;
}

/// 从HttpWebResponse对象中提取响应的数据转换为字符串

public string GetResponseString(HttpWebResponse webresponse)
{
using (Stream s = webresponse.GetResponseStream())
{
StreamReader reader = new StreamReader(s, Encoding.UTF8);
return reader.ReadToEnd();
}
}

调用

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//post请求并调用
Dictionary<string, string> dic = new Dictionary<string, string>();
dic.Add("id", "4");
textBox1.Text = GetResponseString(CreatePostHttpResponse("https://www.itnotes.cc/", dic));

//get请求并调用
textBox3.Text = GetResponseString(CreateGetHttpResponse("https://www.itnotes.cc/get.aspx?opt=1"));