#region 請(qǐng)求Url，不發(fā)送數(shù)據(jù)

/// <summary>
/// 請(qǐng)求Url，不發(fā)送數(shù)據(jù)
/// </summary>
public static string RequestUrl(string url)
{
return RequestUrl(url, "POST");
}

#endregion

#region 請(qǐng)求Url，不發(fā)送數(shù)據(jù)

/// <summary>
/// 請(qǐng)求Url，不發(fā)送數(shù)據(jù)
/// </summary>
public static string RequestUrl(string url, string method)
{
// 設(shè)置參數(shù)
var request = WebRequest.Create(url) as HttpWebRequest;
var cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = method;
request.ContentType = "text/html";
request.Headers.Add("charset", "utf-8");
//發(fā)送請(qǐng)求并獲取相應(yīng)回應(yīng)數(shù)據(jù)
var response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才開(kāi)始向目標(biāo)網(wǎng)頁(yè)發(fā)送Post請(qǐng)求
Stream responseStream = response.GetResponseStream();
var sr = new StreamReader(responseStream, Encoding.UTF8);
//返回結(jié)果網(wǎng)頁(yè)（html）代碼
string content = sr.ReadToEnd();

return content;
}

#endregion

 

#region 獲取Json字符串某節(jié)點(diǎn)的值

/// <summary>
/// 獲取Json字符串某節(jié)點(diǎn)的值
/// </summary>
public static string GetJsonValue(string jsonStr, string key)
{
string result = string.Empty;
if (!string.IsNullOrEmpty(jsonStr))
{
key = "\"" + key.Trim('"') + "\"";
int index = jsonStr.IndexOf(key) + key.Length + 1;
if (index > key.Length + 1)
{
//先截逗號(hào)，若是最后一個(gè)，截"｝"號(hào)，取最小值
int end = jsonStr.IndexOf(',', index);
if (end == -1)
{
end = jsonStr.IndexOf('}', index);
}
result = jsonStr.Substring(index, end - index);
result = result.Trim(new [] {'"', ' ', '\"'}); //過(guò)濾引號(hào)或空格
}
}
return result;
}

#endregion

#region 驗(yàn)證Token是否過(guò)期

/// <summary>
/// 驗(yàn)證Token是否過(guò)期
/// </summary>
public static bool TokenExpired(string access_token)
{
string jsonStr =
RequestUrl(string.Format("https://api.weixin.qq.com/cgi-bin/menu/get?access_token={0}",
access_token));
if (GetJsonValue(jsonStr, "errcode") == "42001")
{
return true;
}
return false;
}

#endregion

#region 獲取Token

/// <summary>
/// 獲取Token
/// </summary>
public static string GetToken(string appid, string secret)
{
string strJson =
RequestUrl(
string.Format(
"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}",
appid, secret));
return GetJsonValue(strJson, "access_token");
}

#endregion

//獲取Openid

public static string GetOpenId(string appid, string secret, string code)
{
string strJson =
RequestUrl(
string.Format(
"https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code",
appid, secret, code));
//LogUtil.WriteLog(strJson);
return GetJsonValue(strJson, "openid");
}