C#基于HttpWebRequest实现发送HTTP请求的方法分析

using HttpWebRequest
using System.IO

/// <summary>
/// 发送GET请求
/// </summary>
/// <param name="url">请求URL，如果需要传参，在URL末尾加上“？+参数名=参数值”即可</param>
/// <returns></returns>
static string HttpGet(string url)
{
  //创建
  HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
  //设置请求方法
  httpWebRequest.Method = "GET";
  //请求超时时间
  httpWebRequest.Timeout = 20000;
  //发送请求
  HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
  //利用Stream流读取返回数据
  StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.UTF8);
  //获得最终数据，一般是json
  string responseContent = streamReader.ReadToEnd();
  streamReader.Close();
  httpWebResponse.Close();
  return responseContent;
}

/// <summary>
/// 发送POST请求
/// </summary>
/// <param name="url">请求URL</param>
/// <param name="data">请求参数</param>
/// <returns></returns>
static string HttpPost(string url, string data)
{
  HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
  //字符串转换为字节码
  byte[] bs = Encoding.UTF8.GetBytes(data);
  //参数类型，这里是json类型
  //还有别的类型如"application/x-www-form-urlencoded"，不过我没用过(逃
  httpWebRequest.ContentType = "application/json";
  //参数数据长度
  httpWebRequest.ContentLength = bs.Length;
  //设置请求类型
  httpWebRequest.Method = "POST";
  //设置超时时间
  httpWebRequest.Timeout = 20000;
  //将参数写入请求对象中
  httpWebRequest.GetRequestStream().Write(bs, 0, bs.Length);
  //发送请求
  HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
  //读取返回数据
  StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.UTF8);
  string responseContent = streamReader.ReadToEnd();
  streamReader.Close();
  httpWebResponse.Close();
  httpWebRequest.Abort();
  return responseContent;
}

httpWebRequest.GetRequestStream().Write(bs, 0, bs.Length);