C#模擬登錄后請求查詢

需求是這樣子的，想開發一個外掛程序，能夠抓取別的系統的數據，從而實現數據驗證。

比如這樣一個界面：

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數據。

於是就可以請求這個地址，並且封裝提交的數據進行http請求即可。

但實驗后發現，需要先登錄系統然后才能進行查詢請求。

分析系統登錄部分代碼發現，仍然是一個ajax post請求后台的代碼，截圖如下：

從js代碼可以看出res=899為登錄失敗，其它為登錄成功。

於是思路就確定了，先模擬登陸系統，然后使用相同的cookie，再次請求查詢即可獲得數據。

 

登錄方法：

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客戶端(界面、應用)
    HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
    cookie.Add(myResponse.Cookies);
    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
    return reader.ReadToEnd();
}

登錄進系統后查詢方法：

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\":\"登錄賬號\",\"userpwd\":\"密碼\"}";
string result_login = PostLogin(postData_login, url_login, ref cc);
if (result_login.Equals("1748"))//1748表示登錄成功
{
    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 = PostRequest(postData_RyData, url_getRyData, cc);
    RyData ry = JsonConvert.DeserializeObject<RyData>(result_RyData);
    if (ry.total <= 0)
    {
        MessageBox.Show("對不起，沒有查找到當前人信息。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        return;
    }
}

返回json數據，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