C#類比登入後請求查詢

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需求是這樣子的，想開發一個外掛程式，能夠抓取別的系統的資料，從而實現資料驗證。

比如這樣一個介面：

使用Chrome瀏覽器分析http請求和響應過程以及頁面的html代碼，發現這是一個ajax請求，於是跟蹤找到了具體的請求地址和查詢時提交的資料。

於是就可以請求這個地址，並且封裝提交的資料進行http請求即可。

但實驗後發現，需要先登入系統然後才能進行查詢請求。

分析系統登入部分代碼發現，仍然是一個ajax post請求背景代碼，如下：

從js代碼可以看出res=899為登入失敗，其它為登入成功。

於是思路就確定了，先類比登陸系統，然後使用相同的cookie，再次請求查詢即可獲得資料。

 

登入方法：

public static string PostLogin(string postData, string requestUrlString, ref CookieContainer cookie){    UTF8Encoding encoding = new UTF8Encoding();    byte[] data = encoding.GetBytes(postData);    //向服務端請求    HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(requestUrlString);    myRequest.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36";    myRequest.Method = "POST";    myRequest.ContentType = "application/x-www-form-urlencoded";    myRequest.ContentLength = data.Length;    myRequest.CookieContainer = new CookieContainer();    myRequest.AllowAutoRedirect = true;    Stream newStream = myRequest.GetRequestStream();    newStream.Write(data, 0, data.Length);    newStream.Close();    //將請求的結果發送給用戶端(介面、應用)    HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();    cookie.Add(myResponse.Cookies);    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);    return reader.ReadToEnd();}

登入進系統後查詢方法：

public static string PostRequest(string postData, string requestUrlString, CookieContainer cookie){    UTF8Encoding encoding = new UTF8Encoding();    byte[] data = encoding.GetBytes(postData);    HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(requestUrlString);    myRequest.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.96 Safari/537.36";    myRequest.Method = "POST";    myRequest.ContentType = "application/x-www-form-urlencoded";    myRequest.ContentLength = data.Length;    myRequest.CookieContainer = cookie;    myRequest.AllowAutoRedirect = true;    Stream newStream = myRequest.GetRequestStream();    newStream.Write(data, 0, data.Length);    newStream.Close();    HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);    return reader.ReadToEnd();}

調用部分代碼：

CookieContainer cc = new CookieContainer();string url_login = "http://10.77.197.23:7001/yzjy/login.action?method=login1";string postData_login = "submitData={\"username\":\"登入帳號\",\"userpwd\":\"密碼\"}";string result_login = UtilHelper.PostLogin(postData_login, url_login, ref cc);if (result_login.Equals("1748"))//1748表示登入成功{    string url_getRyData = "http://10.77.197.23:7001/yzjy/Rygl.do?method=getRyData";    string postData_RyData = "aac002=" + sfz + "&aac003=" + xm + "&pageIndex=0&pageSize=30";    string result_RyData = UtilHelper.PostRequest(postData_RyData, url_getRyData, cc);    RyData ry = JsonConvert.DeserializeObject<RyData>(result_RyData);    if (ry.total <= 0)    {        MessageBox.Show("對不起，沒有尋找到當前人資訊。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);        return;    }}

UtilHelper是自己定義的協助類。返回的json資料，封裝類的代碼：

public class RyData{    public int total { get; set; }    public Data[] data { get; set; }}public class Data{    public string aac161_name { get; set; }    public string tbr { get; set; }    public string aac161 { get; set; }    public string aae100 { get; set; }    public string czdz { get; set; }    public string aac001 { get; set; }    public string aac002 { get; set; }    public string aae005 { get; set; }    public string aac003 { get; set; }    public string aac004 { get; set; }    public string aac005 { get; set; }    public string aac006 { get; set; }    public string aac009_name { get; set; }    public string aac009 { get; set; }    public string aac005_name { get; set; }    public string hjdz { get; set; }    public string aac011_name { get; set; }    public string aae011_name { get; set; }    public string aae036 { get; set; }    public string aac058 { get; set; }    public string aac016 { get; set; }    public string aac016_name { get; set; }    public string aac004_name { get; set; }    public string aac058_name { get; set; }    public string aac024_name { get; set; }    public string rn { get; set; }}

 

參考資料：

http://www.cnblogs.com/ok519/p/3488091.html

C#類比登入後請求查詢