Gis 如何在OpenLayers中正确配置WFS层？

我试图在OpenLayers地图上显示WFS图层。下面是GETCAPABILITIES响应的适当部分

<ows:Operation name="GetFeature">
  <ows:DCP>
    <ows:HTTP>
      <ows:Get xlink:href="http://localhost/MapServer/Default.aspx"/>
      <ows:Post xlink:href="http://localhost/MapServer/Default.aspx"/>
    </ows:HTTP>
  </ows:DCP>
  <ows:Parameter name="resultType">
    <ows:Value>results</ows:Value>
    <ows:Value>hits</ows:Value>
  </ows:Parameter>
  <ows:Parameter name="outputFormat">
    <ows:Value>text/xml; subtype=gml/3.1.1</ows:Value>
  </ows:Parameter>
</ows:Operation>
<ows:Parameter name="srsName">
  <ows:Value>EPSG:4326</ows:Value>
</ows:Parameter>
<ows:Constraint name="DefaultMaxFeatures">
  <ows:Value>20000</ows:Value>
</ows:Constraint>

我看到一个post请求正在向服务器发送，结果会返回，但根本没有显示。为什么图层不显示？任何帮助都将不胜感激

注意

---

此测试脚本是在localhost/mapserver下运行的HTML shell的一部分，因此它排除了常见的跨域问题。

我毫不怀疑这是OpenLayers的配置问题。根据我对OpenLayers的了解，我已经正确地配置了它。事实证明，在我的例子中，设置featurePrefix选项是至关重要的。这是因为每个FeatureMember节点的XML响应（GML）中的名称空间和前缀用于标识响应的适当读取器。默认情况下，featurePrefix设置为“feature”。如果响应的名称空间+前缀与OpenLayers中的配置不匹配，则不会将功能添加到该层，因此不会显示。在我的例子中，前缀被设置为空字符串，因为服务器没有向响应添加前缀

此外，设置geometryName也很重要。对于WFS版本1.0，geometryName的默认值为“The_geom”，对于更高版本，默认值为null。服务器使用geometryName来实际定位要素。在我的例子中，服务器上使用的geometryName是“msGeometry”

这是工作代码

$(document).ready(
function () {
    // allow testing of specific renderers via "?renderer=Canvas", etc
    var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
    renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
    var geographic = new OpenLayers.Projection("EPSG:4326");
    var mercator = new OpenLayers.Projection("EPSG:900913");

    map = new OpenLayers.Map({
        div: "map",
        layers: [
            new OpenLayers.Layer.WMS("OpenLayers WMS",
                "http://vmap0.tiles.osgeo.org/wms/vmap0",
                { layers: "basic" }
            ),
            new OpenLayers.Layer.Vector("GML", {
                strategies: [new OpenLayers.Strategy.Fixed()],
                protocol: new OpenLayers.Protocol.WFS({
                        url: "http://localhost/MapServer/Default.aspx",
                        featureType: "Data_ACTIVE",
                        version: "1.1.0",
                        geometryName: "msGeometry",
                        featurePrefix: ""
                    }),
                    renderers: renderer
                })
        ],
        zoom: 15
    });

    var bb = new OpenLayers.Bounds(-179.821327209473, 12.1057098342161, -56.5289154052734, 78.1442901657839);
    map.zoomToExtent(bb);

}))

$(document).ready(
    function () {
        // allow testing of specific renderers via "?renderer=Canvas", etc
        var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
        renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
        var geographic = new OpenLayers.Projection("EPSG:4326");
        var mercator = new OpenLayers.Projection("EPSG:900913");

        map = new OpenLayers.Map({
            div: "map",
            layers: [
                new OpenLayers.Layer.WMS("OpenLayers WMS",
                    "http://vmap0.tiles.osgeo.org/wms/vmap0",
                    { layers: "basic" }
                ),
                new OpenLayers.Layer.Vector("GML", {
                    strategies: [new OpenLayers.Strategy.Fixed()],
                    protocol: new OpenLayers.Protocol.WFS({
                            url: "http://localhost/MapServer/Default.aspx",
                            featureType: "Data_ACTIVE",
                            featureNS: "http://www.tstgis.org/gml",
                            version: "1.1.0",
                            geometryName: "line"
                        }),
                        renderers: renderer
                    })
            ],
            zoom: 15
        });

        var bb = new OpenLayers.Bounds(-179.821327209473, 12.1057098342161, -56.5289154052734, 78.1442901657839);
        map.zoomToExtent(bb);
});

$(document).ready(
function () {
    // allow testing of specific renderers via "?renderer=Canvas", etc
    var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
    renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
    var geographic = new OpenLayers.Projection("EPSG:4326");
    var mercator = new OpenLayers.Projection("EPSG:900913");

    map = new OpenLayers.Map({
        div: "map",
        layers: [
            new OpenLayers.Layer.WMS("OpenLayers WMS",
                "http://vmap0.tiles.osgeo.org/wms/vmap0",
                { layers: "basic" }
            ),
            new OpenLayers.Layer.Vector("GML", {
                strategies: [new OpenLayers.Strategy.Fixed()],
                protocol: new OpenLayers.Protocol.WFS({
                        url: "http://localhost/MapServer/Default.aspx",
                        featureType: "Data_ACTIVE",
                        version: "1.1.0",
                        geometryName: "msGeometry",
                        featurePrefix: ""
                    }),
                    renderers: renderer
                })
        ],
        zoom: 15
    });

    var bb = new OpenLayers.Bounds(-179.821327209473, 12.1057098342161, -56.5289154052734, 78.1442901657839);
    map.zoomToExtent(bb);