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第一篇C#模拟http请求抓取数据asp.netwebService添加头文件验证

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

很多人用python去抓数据,语法简单又方便。我这里用C#去抓数据,python后期自学下,看下能写出一些好文吗?

上一篇 

 

第一步 先把应用程序发布iis服务器上

第二步 用谷歌浏览器抓下网络请求

观察头文件分析后 确认是post提交的。

请求一般看这些参数 status code 200 说明是正常的没有做跳转的包,长度是根据表单提交的参数计算出来了,如果发现计算的长度和抓取的包的长度不对 有可能是传递表单参数传入有问题 需要排查,

还有content-type 这个有可能会是application/json类型,传递参数那就是json类型了。

2.1 请求

2.2 响应

注意红框就是我想要拿到响应的数据,但是多了很多无用的html标签,这些无用的标签需要替换

参考文献:

正则表达式,去除所有HTML标签 https://www.cnblogs.com/caok168/articles/2567117.html

第三步 编写相关代码

  1 using MyAutomaticRefund.Common;
  2 using Newtonsoft.Json;
  3 using System;
  4 using System.Collections.Generic;
  5 using System.ComponentModel;
  6 using System.Data;
  7 using System.Drawing;
  8 using System.IO;
  9 using System.Linq;
 10 using System.Net;
 11 using System.Text;
 12 using System.Text.RegularExpressions;
 13 using System.Threading.Tasks;
 14 using System.Windows.Forms;
 15 
 16 namespace MyAutomaticRefund
 17 {
 18     public partial class Form1 : Form
 19     {
 20         static CookieContainer m_Cookie = null;
 21 
 22         public Form1()
 23         {
 24             InitializeComponent();
 25         }
 26 
 27         private void button1_Click(object sender, EventArgs e)
 28         {
 29             string result = CaptureData();
 30 
 31             string regexstr = @"<[^>]*>";    //去除所有的标签
 32             result = Regex.Replace(result, regexstr, string.Empty, RegexOptions.IgnoreCase);
 33             MessageBox.Show(result.Trim());
 34         }
 35 
 36         /// <summary>
 37         /// 抓取按钮事件
 38         /// </summary>
 39         /// <returns></returns>
 40         private string CaptureData()
 41         {
 42 
 43             string result = "";
 44             try
 45             {
 46                 string Url = "http://192.168.21.195:8044/WebForm1";
 47                 HttpWebRequest request = WebRequest.Create(Url) as HttpWebRequest;
 48                 request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3";
 49                 request.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36";
 50                 request.Method = "POST";
 51                 request.KeepAlive = true;
 52                 request.Referer = "http://192.168.21.195:8044/WebForm1";
 53                 request.ContentType = "application/x-www-form-urlencoded";
 54                 request.Headers.Add("Accept-Encoding", "gzip, deflate");
 55                 request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.9");
 56                 //request.Headers.Add("X-Requested-With", "XMLHttpRequest");
 57                 request.CookieContainer = m_Cookie;
 58                 request.Host = "192.168.21.195:8044";
 59 
 60                 HttpRequestClient s = new HttpRequestClient(true);
 61 
 62 
 63                 Dictionary<string, string> dic = new Dictionary<string, string>();
 64                 dic.Add("__VIEWSTATE", "BPyDUNYWaU0XKZc1m/+hb4U4rlITcqsuUMRxGp8elUR/ZgK5owxYH030QThFNas5u/roAT5kBYSSMaMYwRFEcw1COVEwFNapeyfnLq2PZ98=");
 65                 dic.Add("__VIEWSTATEGENERATOR","B6E7D48B");
 66                 dic.Add("__EVENTVALIDATION", "3d+F/uurjOe90j09vxq1PU5Tli3EVssuM/HOISX5tyLUP2HdR956+2PC8ezRt2kDXMr1BDkstuMTV11I0laFwL+adHjgxQYtfEObtF/NligPunXkuGz4LuJ6VYdtACGg");
 67                 dic.Add("Button1", "Button");
 68 
 69                 string formData = ConvertStrDic(dic);
 70                 //string formData = "__VIEWSTATE=BPyDUNYWaU0XKZc1m%2F%2Bhb4U4rlITcqsuUMRxGp8elUR%2FZgK5owxYH030QThFNas5u%2FroAT5kBYSSMaMYwRFEcw1COVEwFNapeyfnLq2PZ98%3D&__VIEWSTATEGENERATOR=B6E7D48B&__EVENTVALIDATION=3d%2BF%2FuurjOe90j09vxq1PU5Tli3EVssuM%2FHOISX5tyLUP2HdR956%2B2PC8ezRt2kDXMr1BDkstuMTV11I0laFwL%2BadHjgxQYtfEObtF%2FNligPunXkuGz4LuJ6VYdtACGg&Button1=Button";
 71                 byte[] data = Encoding.UTF8.GetBytes(formData);
 72 
 73                 request.ContentLength = formData.Length;
 74                 using (Stream reqStream = request.GetRequestStream())
 75                 {
 76                     reqStream.Write(data, 0, data.Length);
 77                     reqStream.Close();
 78                 }
 79 
 80                 //响应  
 81                 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 82                 int statusInt = response.StatusCode.GetHashCode();
 83                 //响应成功  
 84                 if (response.StatusCode.ToString().ToLower() == "ok")
 85                 {
 86                     result = s.getResponseBody(response);
 87                     return result;
 88                 }
 89                 return result;
 90             }
 91             catch (Exception ex)
 92             {
 93                 return result;
 94             }
 95 
 96         }
 97 
 98         string ConvertStrDic(Dictionary<string, string> dic)
 99         {
100             StringBuilder formdata = new StringBuilder();
101             foreach (KeyValuePair<string, string> item in dic)
102             {
103                 formdata.Append(item.Key).Append("=").Append(System.Web.HttpUtility.UrlEncode(item.Value)).Append("&");//注意传递的参数需要编码
104             }
105             return formdata.ToString().TrimEnd('&');
106         }
107 
108 
109         public class formTable
110         {
111             public string __VIEWSTATE { get; set; }
112             public string __VIEWSTATEGENERATOR { get; set; }
113             public string __EVENTVALIDATION { get; set; }
114             public string Button1 { get; set; }
115         }
116     }
117 }

运行结果

 

用python语言 怎么写

这里我用到的库是 urllib

用到了request ,urlopen等语法

#第二种思路
import urllib.parse
import urllib.request

#data ="__VIEWSTATE=BPyDUNYWaU0XKZc1m%2F%2Bhb4U4rlITcqsuUMRxGp8elUR%2FZgK5owxYH030QThFNas5u%2FroAT5kBYSSMaMYwRFEcw1COVEwFNapeyfnLq2PZ98%3D&__VIEWSTATEGENERATOR=B6E7D48B&__EVENTVALIDATION=3d%2BF%2FuurjOe90j09vxq1PU5Tli3EVssuM%2FHOISX5tyLUP2HdR956%2B2PC8ezRt2kDXMr1BDkstuMTV11I0laFwL%2BadHjgxQYtfEObtF%2FNligPunXkuGz4LuJ6VYdtACGg&Button1=Button"

str = {
        '__VIEWSTATE': 'i8VVE3gtBLKgjBpYFwMCruW86sOjv2lTpmzZF3mD3L/QIkX0Ode3Xc9MaMXFQnjiAK80xxkQ9rjTyjGrBWvbLwcxug4r9Akhmcxs/plCdYM=',
        '__VIEWSTATEGENERATOR':'B6E7D48B',
        '__EVENTVALIDATION':'2X6ageL+LlYeiTSgyQPd/FPAhPtg350MNiiKvURoS4xMsysX+0HyGjGN93yx7K27/NubbDHt2oTpWbFCv1dampTLrZkWvsf32lHlqJUliAsudoGhZ3kwM/XCxXSlvhNr',
        'Button1':'Button'
}

# headers={
# 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.86 Safari/537.36'
# }
# str = {'__VIEWSTATE': 'i8VVE3gtBLKgjBpYFwMCruW86sOjv2lTpmzZF3mD3L/QIkX0Ode3Xc9MaMXFQnjiAK80xxkQ9rjTyjGrBWvbLwcxug4r9Akhmcxs/plCdYM=','__VIEWSTATEGENERATOR':'B6E7D48B','__EVENTVALIDATION':'2X6ageL+LlYeiTSgyQPd/FPAhPtg350MNiiKvURoS4xMsysX+0HyGjGN93yx7K27/NubbDHt2oTpWbFCv1dampTLrZkWvsf32lHlqJUliAsudoGhZ3kwM/XCxXSlvhNr','Button1':'Button'}

data = bytes(urllib.parse.urlencode(str),encoding='utf-8')
url = "http://192.168.21.195:8044/WebForm1"
# request = urllib.request.Request(url=url,data=data,headers=headers,origin_req_host='192.168.21.195:8044',unverifiable=True,method='POST')
#第一种写法
# request = urllib.request.Request(url=url,data=data)
# response = urllib.request.urlopen(request)
# print(response.read().decode('utf-8'))
#第二种写法
response = urllib.request.urlopen(url,data=data)
print(response.read().decode('utf-8'))
# print(response.read()) 不设置编码格式是不能拿到想要的数据的

太乱了,整理一下把调试代码拿掉

#第二种思路
import urllib.parse
import urllib.request

str = {
        '__VIEWSTATE': 'i8VVE3gtBLKgjBpYFwMCruW86sOjv2lTpmzZF3mD3L/QIkX0Ode3Xc9MaMXFQnjiAK80xxkQ9rjTyjGrBWvbLwcxug4r9Akhmcxs/plCdYM=',
        '__VIEWSTATEGENERATOR':'B6E7D48B',
        '__EVENTVALIDATION':'2X6ageL+LlYeiTSgyQPd/FPAhPtg350MNiiKvURoS4xMsysX+0HyGjGN93yx7K27/NubbDHt2oTpWbFCv1dampTLrZkWvsf32lHlqJUliAsudoGhZ3kwM/XCxXSlvhNr',
        'Button1':'Button'
}

data = bytes(urllib.parse.urlencode(str),encoding='utf-8')
url = "http://192.168.21.195:8044/WebForm1"

#第二种写法
response = urllib.request.urlopen(url,data=data)
print(response.read().decode('utf-8'))

 

运行效果

 

再优化下正则去除多余html标签

import re

resstr=response.read().decode('utf-8')
new_st = re.sub(r'<[^>]*>','',resstr)
print(new_st.split())

  

 

总结:1,测试后不需要添加头文件。

            2,抓数据方面,python语法比C#语法简单.

            3,python语法注意事项:data里面是键值队形式和json一致


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