标签：写入 代码 using 服务器 获得 request tin 替换 red
首先说一下HttpRequest、WebClient和HttpClient的关系：HttpRequest是基层的请求方式，WebClient是对HttpRequest的简化封装，在WebClient中有对HttpRequest的默认设置；HttpClient是重写的请求方式，相对于HttpRequest更简单实现异步请求，是.NetCore中更推崇的方式。
说明：以下代码中 在GetAccessToken(Async)中调用了调用了PostMail(Async)方式,其中在GetAccessToken(Async)实现GET请求，在PostMail(Async)中实现POST请求
一、对比一下HttpRequest与HttpClient实现GET请求的过程区别（其实很相似，但HttpClient轻松实现了异步）
1）HttpRequest的GET请求
public ActionResult<string> GetAccessToken() { //GET获取accessToken的参数 corid string uri = "你的URL"; //创建请求 //HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri); //WebClient是对HttpWebRequest的抽象,WebClient使用简单，但速度慢;Restsharp兼具WebClient和HttpWebClient的优点；HttpClient是.NetCore中的概念，更适合异步编程 WebRequest request = WebRequest.Create(uri); //请求设置 request.Credentials = CredentialCache.DefaultCredentials; //创建应答接收 WebResponse response = request.GetResponse(); //创建应答读写流 string accessToken; using (Stream streamResponse=response.GetResponseStream()) { StreamReader reader = new StreamReader(streamResponse); string responseFromServer = reader.ReadToEnd(); JObject res = (JObject)JsonConvert.DeserializeObject(responseFromServer); accessToken = res["access_token"].ToString(); reader.Close(); } //获得许可证凭证 PostMail(accessToken); //关闭响应 response.Close(); return "success"; }
2）HttpClient的GET请求
public async Task<ActionResult<string>> GetAccessTokenAsync() { string uri = "你的URL"; HttpClientHandler handler = new HttpClientHandler { //设置是否发送凭证信息，有的服务器需要验证身份，不是所有服务器需要 UseDefaultCredentials = false }; HttpClient httpClient = new HttpClient(handler); HttpResponseMessage response = await httpClient.GetAsync(uri); response.EnsureSuccessStatusCode(); string accessToken; //回复结果直接读成字符串 string resp = await response.Content.ReadAsStringAsync(); JObject json = (JObject)JsonConvert.DeserializeObject(resp); accessToken = json["access_token"].ToString(); //采用流读数据 //using (Stream streamResponse = await response.Content.ReadAsStreamAsync()) //{ // StreamReader reader = new StreamReader(streamResponse); // string responseFromServer = reader.ReadToEnd(); // JObject res = (JObject)JsonConvert.DeserializeObject(responseFromServer); // accessToken = res["access_token"].ToString(); // reader.Close(); //} //获得许可证凭证 PostMailAsync(accessToken); //关闭响应 return "success"; }
二、对比一下HttpRequest与HttpClient实现POST请求的过程区别
1)HttpRequest的POST请求
public void PostMail(string accessToken) { //POST的API string uri = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=" + accessToken; //创建请求 WebRequest myWebRequest = WebRequest.Create(uri); //请求设置 myWebRequest.Credentials = CredentialCache.DefaultCredentials; myWebRequest.ContentType = "application/json;charset=UTF-8"; myWebRequest.Method = "POST"; //向服务器发送的内容 using (Stream streamResponse = myWebRequest.GetRequestStream()) { //创建JSON格式的发送内容 JObject postedJObject = new JObject { //在此处设置发送内容及对象 { "touser", "Heavy" }, { "msgtype", "text" }, { "agentid", 1000002 } }; JObject text = new JObject { {"content","内容来自网站--内容可自行编辑--heavy"} }; postedJObject.Add("text", text); postedJObject.Add("safe", 0); //将传送内容编码 String paramString = postedJObject.ToString(Newtonsoft.Json.Formatting.None, null); byte[] byteArray = Encoding.UTF8.GetBytes(paramString); //向请求中写入内容 streamResponse.Write(byteArray, 0, byteArray.Length); } //创建应答 WebResponse myWebResponse = myWebRequest.GetResponse(); //创建应答的读写流 string responseFromServer; using (Stream streamResponse = myWebResponse.GetResponseStream()) { StreamReader streamRead = new StreamReader(streamResponse); responseFromServer = streamRead.ReadToEnd(); } //关闭应答 myWebResponse.Close(); }
2）HttpClient的POST请求
public async void PostMailAsync(string accessToken) { string uri = "https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=" + accessToken; HttpClientHandler handler = new HttpClientHandler { UseDefaultCredentials = true, }; HttpClient httpClient = new HttpClient(handler); JObject postedJObject = new JObject { //在此处设置发送内容及对象 { "touser", "Heavy" }, { "msgtype", "text" }, { "agentid", 1000002 } }; JObject text = new JObject { {"content","内容来自网站--内容可自行编辑--heavy"} }; postedJObject.Add("text", text); postedJObject.Add("safe", 0); //将传送内容编码 String paramString = postedJObject.ToString(Newtonsoft.Json.Formatting.None, null); //byte[] byteArray = Encoding.UTF8.GetBytes(paramString); HttpContent httpContent = new StringContent(paramString,Encoding.UTF8,"application/json"); HttpResponseMessage response = await httpClient.PostAsync(uri, httpContent);
//用来判断是否接收成功，否则抛出异常 response.EnsureSuccessStatusCode(); }
HttpClient替换HttpWebRequest--以GET和POST请求为例说明
标签：写入 代码 using 服务器 获得 request tin 替换 red
原文地址：https://www.cnblogs.com/Heavystudio/p/10954362.html
