NetworkHelper

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最新推荐文章于 2025-01-03 12:12:25 发布

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分类专栏： Helpers Http

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本文链接：https://blog.youkuaiyun.com/cxb2011/article/details/114543020

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此篇博客介绍了一个名为NetworkHelper的类，用于从给定的URI获取文本，包括处理各种网络请求异常，并支持gzip和deflate编码的解压缩。重点在于处理WebException和SocketException，确保高效稳定的网络数据获取。

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class NetworkHelper
{
    public static string GetTextFromUri(string uri)
    {
        return GetTextFromUri(uri, Encoding.UTF8);
    }

    public static string GetTextFromUri(string uri, Encoding
    {
        try
        {
            var buffer = GetBytesFromUri(uri);
            return encoding.GetString(buffer);
        }
        catch (Exception)
        {
            return string.Empty;
        }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="uri"></param>
    /// <returns></returns>
    /// <exception cref="WebException"></exception>
    /// <exception cref="SocketException"></exception>
    public static byte[] GetBytesFromUri(string uri)
        {
            using (WebClient client = new WebClient())
            {
                try
                {
                    client.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36");

                    client.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip, deflate"); // 在服务器支持的情况下，接受gzip或deflate压缩流
                    var ns = client.OpenRead(uri);
                    Stream stream = ns;
                    var contentEncoding = client.ResponseHeaders.Get("Content-Encoding");
                    if (contentEncoding == "gzip")
                    {
                        stream = new GZipStream(ns, CompressionMode.Decompress);
                    }
                    else if (contentEncoding == "deflate")
                    {
                        stream = new DeflateStream(ns, CompressionMode.Decompress);
                    }
                    MemoryStream ms = new MemoryStream();
                    stream.CopyTo(ms);
                    return ms.ToArray();
                }
                //通常是404
                catch (System.Net.WebException e)
                {
                    //Logger.Log("Exception at GetXmlFromUri(" + uri + "), msg: " + e.Message);
                    throw;

                }
                //通常是超时
                catch (System.Net.Sockets.SocketException e)
                {
                    //Logger.Log("Exception at GetXmlFromUri(" + uri + "), msg: " + e.Message);
                    throw;
                }

            }
        }