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问题：POST请求参数含有中文，已将含中文的string以UTF-8编码格式转为byte[]，并写入到请求流中，但服务器收到数据后以UTF-8解码，得到的依然是乱码！

百度到了以下方法，但依然无法解决问题：

byte[] data = Encoding.UTF8.GetBytes(buffer.ToString());

因为问题根本不在这里，而是在必须写上ContentType，并指明字符集 。

同时总结POST请求的写法。

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联网工具类：

/// <summary>
/// 带参的POST请求，传递文本数据
/// </summary>
/// <param name="url">例如 192.168.1.222:8080/getMaterialsBySpacePlanIdToClient</param>
/// <param name="parameters"></param>
/// <returns></returns>
public string HttpPostRequest(string url, IDictionary<string, string> parameters)
{HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(GlobalVariable.SERVER_ADDRESS_TEMP + url);httpWebRequest.Method = "POST";httpWebRequest.ContentType = "application/x-www-form-urlencoded;charset=utf8"; // 必须指明字符集！httpWebRequest.Timeout = 20000;// 参数if (!(parameters == null || parameters.Count == 0)){StringBuilder buffer = new StringBuilder();int i = 0;foreach (string key in parameters.Keys){if (i > 0){buffer.AppendFormat("&{0}={1}", key, parameters[key]);}else{buffer.AppendFormat("{0}={1}", key, parameters[key]);}i++;}// 给文本数据编码byte[] data = Encoding.UTF8.GetBytes(buffer.ToString()); // 必须与ContentType中指定的字符集一致！// 往请求的流里写数据using (Stream stream = httpWebRequest.GetRequestStream()){stream.Write(data, 0, data.Length);}}// 从响应对象中获取数据HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.GetEncoding("UTF-8"));string responseContent = streamReader.ReadToEnd();streamReader.Close();httpWebResponse.Close();httpWebRequest.Abort();return responseContent;
}/// <summary>
/// 无参的POST请求
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public string HttpPostRequest(string url)
{HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(GlobalVariable.SERVER_ADDRESS_TEMP + url);httpWebRequest.ContentType = "application/x-www-form-urlencoded"; // 因为POST无参，不写字符集也没问题httpWebRequest.Method = "POST";httpWebRequest.Timeout = 20000;HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());string responseContent = streamReader.ReadToEnd();streamReader.Close();httpWebResponse.Close();httpWebRequest.Abort();return responseContent;
}

调用以上方法

// 获取数据
private void GetCityAndCommunityJsonData()
{Dictionary<string, string> dic = new Dictionary<string, string>();dic.Add("provinceName", "广西壮族自治区"); string request = GlobalVariable.GET_CITYS_BY_PROVINCE_TO_CLIENT;string json = NetworkUtils.Instance.HttpPostRequest(request, dic);System.Console.WriteLine("完成：获取城市/小区数据");// 将Json反序列化为对应的对象集合list = JsonConvert.DeserializeObject<List<CityAndCommunity>>(json);for (int i = 0; i < list.Count; i++){System.Console.WriteLine(list[i].ToString());}
}// 实体类
class CityAndCommunity
{public string City { get; set; }public string[] Community { get; set; }public override string ToString(){if (Community != null){string communityStr = "";for (int i = 0; i < Community.Length; i++){if (i != Community.Length - 1){communityStr += Community[i] + " , ";}else{communityStr += Community[i].ToString();}}return "===========================================\nCity = "+ City + " , communityStr = " + communityStr;}return base.ToString();}
}

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坑点：

• 必须加上httpWebRequest.ContentType = “application/x-www-form-urlencoded;charset=utf8”; 其中字符集也可以是gb2312，只要跟给文本数据编码采用同样格式即可。

极其重要的参考：

http://46aae4d1e2371e4aa769798941cef698.devproxy.yunshipei.com/u011185231/article/details/52090334