ASP.NET写的AJAX跨域代理
我用AJAX写了个ArcIMS的WebGIS，在做测试的时候链接的是网络上别的城市的数据，当然，不可避免就出现了跨域问题咯。AJAX跨域的本质是JS的问题，JS写的程序只允许访问本域内的数据，而跨域则受到限制，在IE中会弹出一个警告，在FF中直接就被终止了，所以我的这个WebGIS在解决跨域之前无法在FF中使用（如果数据在本域还是可以的）。
好了，跨域解决的方法很简单，即在本域中新建一个不使用XHR对象发送请求并接收响应的程序即可，因此，asp、aspnet、jsp或servlet都能够担当此重任。下面是我写的一个aspnet代理：using System;
using System.Data;
using System.Text;
using System.IO;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Net;
public partial class Proxy : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string url = Request["URL"].ToString();
string clientversion = Request["ClientVersion"].ToString();
string customservice = string.Empty;
string URL = string.Empty;
if (Request["CustomService"] != null)//注意不能要form的参数
{
customservice = Request["CustomService"].ToString();
URL = url + "&CustomService=" + customservice+ "&ClientVersion=" + clientversion ;
}
else
{
URL = url + "&ClientVersion=" + clientversion;
}
string arcxml = Request["ArcXML"].ToString();
byte[] postBytes = Encoding.UTF8.GetBytes(arcxml);
string result = string.Empty;
HttpWebRequest HttpWReq =(HttpWebRequest)WebRequest.Create(URL);
HttpWReq.Method = "Post";
HttpWReq.ContentType = "application/x-www-form-urlencoded";
HttpWReq.ContentLength = postBytes.Length;
using (Stream reqStream = HttpWReq.GetRequestStream())
{
reqStream.Write(postBytes, 0, postBytes.Length);
}
HttpWebResponse HttpWResp = (HttpWebResponse)HttpWReq.GetResponse();
StreamReader reader = new StreamReader(HttpWResp.GetResponseStream(), Encoding.UTF8);
result = reader.ReadToEnd();
//HttpWResp.Close();
Response.Write(result);
Response.End();
}
}
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我猜测.NET LINK就是这样写的