NND，openlayers跨域访问geoserver居然要用到代理，貌似Felx就不用，用C#编写代理网上普遍是这样的：
public class GeoServerProxy1 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
if (context.Request.QueryString["URL"] != null)
{
string url = "";
url = context.Request.QueryString["URL"].ToString();
HttpWebRequest loHttp = (HttpWebRequest)WebRequest.Create(url);
loHttp.Timeout = 10000; // 10 secs
loHttp.UserAgent = "Web Client";
HttpWebResponse loWebResponse = (HttpWebResponse)loHttp.GetResponse();
Encoding enc = Encoding.GetEncoding(65001);
StreamReader loResponseStream = new StreamReader(loWebResponse.GetResponseStream(), enc);
string lcHtml = loResponseStream.ReadToEnd();
context.Response.Write(lcHtml);
loWebResponse.Close();
loResponseStream.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
但是上面这种情况，没有考虑post，不适用于openlayers官方的wfs协议访问，但是可以用于http查询方式的访问，例如：
vectorLayer = new OpenLayers.Layer.Vector("覆冰点", {
protocol: new OpenLayers.Protocol.HTTP({
//url: "http://10.180.80.206:9000/geoserver/sdgis/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=sdgis:V_YL_24&maxFeatures=50",
//url: "http://10.180.80.206:9000/geoserver/sdgis/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=sdgis:GIS_WEATHER_FORECAST&maxFeatures=50",
url: "http://10.180.80.206:9000/geoserver/sdgis/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=sdgis:V_FBJC_PT&maxFeatures=50",
format: new OpenLayers.Format.GML()
}),
styleMap: new OpenLayers.StyleMap({
'default': {
strokeColor: "#00FF00",
strokeOpacity: 1,
strokeWidth: 2,
fillColor: "#FF0000",
fillOpacity: 1,
pointRadius: 6,
strokeDashstyle: 'longdashdot',
pointerEvents: "visiblePainted",
externalGraphic: "snow.gif",
graphicWidth: 12,
graphicHeight: 12,
//label: "name: ${OWNER}, age: ${FLAGS}",
fontColor: "${favColor}",
fontSize: "12px",
fontFamily: "Courier New, monospace",
fontWeight: "bold",
labelAlign: "${align}",
labelXOffset: "${xOffset}",
labelYOffset: "${yOffset}"
}
}),
renderers: renderer,
strategies: [new OpenLayers.Strategy.Fixed()]
});
我们，先来看看openlayers官方wfs协议是怎么访问的：
var fbjcLayer = new OpenLayers.Layer.Vector("FBJC_PT", {
strategies: [new OpenLayers.Strategy.BBOX()],
protocol: new OpenLayers.Protocol.WFS({
version: "1.1.0",
url: "http://10.180.80.206:9000/geoserver/wfs",
featureType: "sdgis:V_FBJC_PT",
featureNS: "sdgid"
}),
renderers: OpenLayers.Layer.Vector.prototype.renderers
});
这是一个post请求，我们修改代理程序来支持，如果用网上流传的代理程序会报parameter missing异常，下面是改进后的C#代理：
public class GeoServerProxy1 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
if (string.IsNullOrEmpty(context.Request["URL"])) return;
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(context.Request["URL"]);
request.UserAgent = context.Request.UserAgent;
request.ContentType = context.Request.ContentType;
request.Method = context.Request.HttpMethod;
byte[] trans = new byte[1024];
int offset = 0;
int offcnt = 0;
if (request.Method.ToUpper() == "POST")
{
Stream nstream = request.GetRequestStream();
while (offset < context.Request.ContentLength)
{
offcnt = context.Request.InputStream.Read(trans, offset, 1024);
if (offcnt > 0)
{
nstream.Write(trans, 0, offcnt);
offset += offcnt;
}
}
nstream.Close();
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
//Encoding enc = Encoding.GetEncoding(65001);
context.Response.ContentType = response.ContentType;
StreamReader loResponseStream = new StreamReader(response.GetResponseStream());
string lcHtml = loResponseStream.ReadToEnd();
context.Response.Write(lcHtml);
response.Close();
loResponseStream.Close();
}
public bool IsReusable
{
get
{
return false;
}
}
}