C#实现下载网页图片文件

 把方法封装到你的类中，编译一下吧！这段代码是从项目中提取出的简单一段。你使用的使用可能根据具体情况修改一下。

  /// <summary> /// 执行POST请求，获娶验证码图片 /// </summary> /// <param name="localHost">Post请求的图片地址</param> /// <param name="referer">Referer地址</param> /// <returns>图片文件名称</returns> public string GetPostImage(string localHost,string referer) { Random rdFile = new Random(); string filename = rdFile.Next(9999).ToString() + ".png"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(localHost); request.Method = "GET"; request.ContentType = "image/png"; request.Referer = referer; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); FileStream fs = new FileStream(filename, FileMode.OpenOrCreate, FileAccess.Write); Stream stream = response.GetResponseStream(); long length = response.ContentLength; long i = 0; while (i < length) { byte[] bit = new byte[1024]; i += stream.Read(bit, 0, bit.Length); fs.Write(bit, 0, bit.Length); } stream.Close(); fs.Close(); fs.Dispose(); response.Close(); return filename; }

C#模拟ＰＯＳＴ请求：

/// <summary> /// 执行一次Post请求 /// </summary> /// <param name="localHost">请求地址</param> /// <param name="post">Post请求串</param> /// <param name="referer">Referer地址</param> /// <returns>请求主体内容</returns> public string GetPost(string localHost, string post,string referer) { string content = ""; UTF8Encoding encodingUtf8 = new UTF8Encoding(); byte[] byteDate = encodingUtf8.GetBytes(post); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(localHost.Trim()); request.Method = "POST"; request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = byteDate.Length; request.Referer = referer; Stream stream = request.GetRequestStream(); stream.Write(byteDate, 0, byteDate.Length); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); StreamReader read = new StreamReader(response.GetResponseStream(), Encoding.UTF8); //默认编码 content = read.ReadToEnd(); read.Close(); stream.Close(); response.Close(); return content; }