HTTP网络请求与文件下载示例-优快云博客

本文链接：https://blog.youkuaiyun.com/asds123as12sa/article/details/18187029

本文展示了如何使用C#进行HTTP网络请求，并通过URL编码实现特定城市天气信息的获取，同时演示了文件下载的基本操作。代码实例包括GET请求、设置请求头、接收响应流等关键步骤。

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string url = "http://php.weather.sina.com.cn/xml.php?city=" + HttpUtility.UrlEncode("遂宁", Encoding.GetEncoding("GB2312")) + "&password=DJOYnieT8234jlsK&day=0";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "Get"; //Get or Post
req.ContentType = "application/x-www-form-urlencoded";

HttpWebResponse rep = (HttpWebResponse)req.GetResponse();

//获取流

using (Stream receiveStream = rep.GetResponseStream())
{

}

string url = "http://php.weather.sina.com.cn/xml.php?city=" + HttpUtility.UrlEncode("遂宁", Encoding.GetEncoding("GB2312")) + "&password=DJOYnieT8234jlsK&day=0";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "Get";  //Get or Post
            req.ContentType = "application/x-www-form-urlencoded";
            
            HttpWebResponse rep = (HttpWebResponse)req.GetResponse();
//获取流
            using (Stream receiveStream = rep.GetResponseStream())
            {
               
            }

 string url = "http://www.fm418.com/UploadFile/book2013122311513570622.mp3";//url
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);//创建请求

            req.Method = "Get";  //Get or Post

            req.Accept = "application/json, text/javascript, */*; q=0.01";//请求信息
            req.ContentType = "application/json; charset=UTF-8";

            string param = "{id:" + txtId.Text + ",uid:" + txtUid.Text + "}"; //设置参数
            using (Stream stream = req.GetRequestStream()) //把参数添加进去
            {
                byte[] buf = Encoding.UTF8.GetBytes(param);
                stream.Write(buf, 0, buf.Length);
            }

            HttpWebResponse rep = (HttpWebResponse)req.GetResponse();   //返回对象
            //获取流
            using (Stream receiveStream = rep.GetResponseStream())
            {
                
                
            }

C#发送 http请求