C#模拟登录后请求查询

需求是这样子的，想开发一个外挂程序，能够抓取别的系统的数据，从而实现数据验证。

比如这样一个界面：

使用Chrome浏览器分析http请求和响应过程以及页面的html代码，发现这是一个ajax请求，于是跟踪找到了具体的请求地址和查询时提交的数据。

于是就可以请求这个地址，并且封装提交的数据进行http请求即可。

但实验后发现，需要先登录系统然后才能进行查询请求。

分析系统登录部分代码发现，仍然是一个ajax post请求后台的代码，截图如下：

从js代码可以看出res=899为登录失败，其它为登录成功。

于是思路就确定了，先模拟登陆系统，然后使用相同的cookie，再次请求查询即可获得数据。

登录方法：

public static string PostLogin(string postData, string requestUrlString, ref CookieContainer cookie)
{
    UTF8Encoding encoding = new UTF8Encoding();
    byte[] data = encoding.GetBytes(postData);
    //向服务端请求
    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();
    //将请求的结果发送给客户端(界面、应用)
    HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
    cookie.Add(myResponse.Cookies);
    StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
    return reader.ReadToEnd();
}

登录进系统后查询方法：

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();
}

调用部分代码：

CookieContainer cc = new CookieContainer();
string url_login = "http://10.77.197.23:7001/yzjy/login.action?method=login1";
string postData_login = "submitData={"username":"登录账号","userpwd":"密码"}";
string result_login = PostLogin(postData_login, url_login, ref cc);
if (result_login.Equals("1748"))//1748表示登录成功
{
    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("对不起，没有查找到当前人信息。", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        return;
    }
}

返回json数据，封装类的代码：

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; }
}

参考资料：

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