s3_demo/S3Demo/Helper/HttpHelper.cs

using System.IO;
using System.Net;
using System.Text;

namespace S3Demo.Helper
{
    public class HttpHelper
    {
        /// <summary>
        /// POST请求
        /// </summary>
        /// <param name="url">请求地址</param>
        /// <param name="postData">JSON格式请求数据</param>
        /// <returns>返回响应内容</returns>
        public static string PostUrl(string url, string postData)
        {
            string result = "";

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

            req.Method = "POST";

            req.Timeout = 10000;

            req.ContentType = "application/json";

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

            req.ContentLength = data.Length;

            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);

                reqStream.Close();
            }

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

            Stream stream = resp.GetResponseStream();

            //获取响应内容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }

            return result;
        }

    }
}