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ASP.NET XmlHttp跨域访问实现代码

时间:2021-07-01 10:21:17 帮助过:7人阅读

原来由于浏览器的安全限制,网络连接的跨域访问时不被允许的。我们不能在浏览器端直接使用AJAX来跨域访问资源,但是在服务器端是没有这种跨域安全限制的。所以,我们只需要让服务器端帮我们完成“跨域访问”的工作,然后直接获取服务器端“跨域访问”的结果就可以了。分享下我的解决办法,希望能有所帮助。^_^
CertCheck.aspx: 
代码如下:
using MSXML2;
  namespace CA2
  {
  public partial class CertCheck : System.Web.UI.Page
  {
  protected void Page_Load(object sender, EventArgs e)
  {
  if (Request["resultid"] != null)
  {
  string s = Request["resultid"];
  string[] result = s.Split('@');
  Label1.Text = result[1];
  System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
  xmlDoc.Load("VBR.xml");
  System.Xml.XmlElement RegNode = xmlDoc.CreateElement("Id");
  RegNode.InnerText = result[0];
  xmlDoc.DocumentElement.AppendChild(RegNode);
  RegNode = xmlDoc.CreateElement("Serial");
  RegNode.InnerText = result[1];
  xmlDoc.DocumentElement.AppendChild(RegNode);
  MSXML2.XMLHTTP xh = new MSXML2.XMLHTTPClass();
  xh.open("POST", "http://222.19.211.119/CAProcess.aspx", false, null, null);
  xh.setRequestHeader("Content-Type", "text/xml");
  xh.setRequestHeader("Content-Type", "gb2312");
  xh.send(xmlDoc.InnerXml);
  if (xh.readyState == 4)
  {
  if (xh.status == 200)
  {
  Label1.Text += "###" + xh.responseText;
  }
  }
  }
  }
  }
  }

VBR.xml: 
代码如下:
<?xml version="1.0"?>
<root>
</root>

PS: 在xh.send()中可以直接写参数,
CertCheck.aspx:
代码如下:
using System.Net;
  using System.IO;
  namespace CA2
  {
  public partial class CertCheck : System.Web.UI.Page
  {
  protected void Page_Load(object sender, EventArgs e)
  {
  if (Request["resultid"] != null)
  {
  string s = Request["resultid"];
  string[] result = s.Split('@');
  Label1.Text = result[1];
  string param = "Id="+result[0]+"&Serial="+result[1];
  byte[] bs = Encoding.ASCII.GetBytes(param);
  HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://222.19.211.119/CAProcess.aspx");
  req.Method = "POST";
  req.ContentType = "application/x-www-form-urlencoded";
  req.ContentLength = bs.Length;
  Stream reqStream = req.GetRequestStream();
  reqStream.Write(bs, 0, bs.Length);
  reqStream.Close();
  HttpWebResponse myResponse = (HttpWebResponse)req.GetResponse();
  StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.GetEncoding("GB2312"));
  string content = reader.ReadToEnd();
  reader.Close();
  myResponse.Close();
  Label1.Text += "###" + content.ToString();
  }
  }
  }
  }

CAProcess.aspx
代码如下:
protected void Page_Load(object sender, EventArgs e)
  {
  int Id = int.Parse(Request.Form["Id"]);
  string Serial = Request.Form["Serial"];
  //
  Response.Write(Id.ToString()+" "+Serial);
  Response.End();
  }

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