C# 模拟浏览器的POST/GET请求

本文部分来源其它博客的摘取，如有侵权请留言删除。

本文为模拟浏览器的POST/GET请求，向web应用发起命令，具体代码可应用在网络爬虫，病毒机器人等方面。

下面是主要用到的一些代码段：

1.构建HTTPRequest请求/POST/GET

private HttpWebRequest createRequest(String url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            //Post请求方式  
            request.Method = "POST";
            //内容类型 
            request.ContentType = "application/json";
            if (token != null&&token!="")
                request.Headers.Add("Authorization","Bearer " + token);
            return request;
        }

2.向Request写入参数

        public String writeParas(HttpWebRequest request,string jsonParas)
        {
            byte[] payload;
            //将Json字符串转化为字节  
            payload = System.Text.Encoding.UTF8.GetBytes(jsonParas);
            //设置请求的ContentLength   
            request.ContentLength = payload.Length;
            //发送请求，获得请求流 
            request.ServicePoint.Expect100Continue = false;
            //HttpWebResponse resp = (HttpWebResponse)request.GetResponse();
            Stream writer = null;

            try
            {
                writer = request.GetRequestStream();//获取用于写入请求数据的Stream对象 
            }
            catch (Exception)
            {
                writer = null;
                Console.Write("连接服务器失败!");
            }

            //将请求参数写入流 
            writer.Write(payload, 0, payload.Length);
            writer.Close();//关闭请求流 

            HttpWebResponse response;
            try
            {
                //获得响应流 
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
            }

            Stream s = response.GetResponseStream();

            StreamReader sRead = new StreamReader(s);
            string postContent = sRead.ReadToEnd();
            sRead.Close();

            return postContent;
        }

3.解析返回值

如果是规则的json字符串，比较好解析

                //字符串转json对象
                JObject jsonData = JObject.Parse(resp);


                //从json对象中取值
                JObject data = (JObject)jsonData["data"];


                //当json对象取值为对象列表，使用JArray接收，foreach遍历，即可得到每个对象
                JArray droneL = (JArray)data["drone"];
                foreach (JObject d in droneL)
                {
                }

如果是普通字符串，使用字符串截取函数.

3.1.根据单个分隔字符用split截取

string st="GT123_1";
 

string[] sArray=st.split("_");

即可得到sArray[0]="GT123",sArray[1]="1";

3.2.利用多个字符来分隔字符串

string str = "GTAZB_JiangjBen_123";
string[] sArray = str.Split(new char[2] { 'j', '_' });
foreach(string e in sArray)
{
Console.WriteLine(e);
}

得到sArray[0]="GTAZB",sArray[1]="Jiang",sArray[2]="Ben",sArray[3]="123";

3.3根据字符串或字符串组来截取字符串

string str = "GTAZB_JiangjBen_123";
string[] sArray = str.Split( new string[]{"Ji","jB"}, StringSplitOptions.RemoveEmptyEntries);
foreach(string e in sArray)
{
Console.WriteLine(e);
}

得到sArray[0]="GTAZB_",sArray[1]="ang",sArray[2]="en_123";

3.4提取字符串中的第i个字符开始的长度为j的字符串；特别的利用IndexOf找出目的字段所在位置;

string str = "GTAZB_JiangjBen_123";
int start=3,length=8; 
Console.WriteLine(str.Substring(start-1, length));

输出得到AZB_Jian。

3.5提取字符串中右数长度为i的字符串

string str = "GTAZB_JiangjBen_123";
string tSt;
int i=5;
tSt = str.Substring(str.Length - i); 
Console.WriteLine(tSt);

输出n_123;

3.6 取字符串的前i个字符
  

 str=str.Substring(0,i); // or  str=str.Remove(i,str.Length-i); 

3.7 去掉字符串的前i个字符：
  

 str=str.Remove(0,i);  // or str=str.Substring(i);