OpenLayers 搭建跨域代理（WFS）

1、下載proxy.cgi文件，url:http://svn.openlayers.org/trunk/openlayers/examples/proxy.cgi。

2、安裝python,url:http://python.org/。

3、在地圖項目的web.xml中添加如下配置:

<servlet>

       <servlet-name>cgi</servlet-name>

      <servlet-class>org.apache.catalina.servlets.CGIServlet</servlet-class>

       <init-param>

         <param-name>debug</param-name>

         <param-value>0</param-value>

       </init-param>       

       <init-param>

         <param-name>cgiPathPrefix</param-name>

         <param-value>WEB-INF/cgi</param-value>

       </init-param>       

       <init-param>     

           <param-name>executable</param-name>

         <!-- your python install path-->

           <param-value>c:/Python27/python.exe</param-value>

       </init-param>

       <init-param>

           <param-name>passShellEnvironment</param-name>

           <param-value>true</param-value>

       </init-param>       

        <load-on-startup>5</load-on-startup>

   </servlet>

   <!-- The mapping for the default servlet-->

   <servlet-mapping>

       <servlet-name>default</servlet-name>

       <url-pattern>/</url-pattern>

   </servlet-mapping>

   <servlet-mapping>

       <servlet-name>cgi</servlet-name>

       <url-pattern>/cgi/*</url-pattern>

</servlet-mapping>

4、在Tomcat的配置文件中找到context.xml做如下修改：

<Context privileged="true"></Context>

或者copy 該文件至META-INF下做如上修改。

5、在WEB-INF下創建文件夾cgi,將下載的proxy.cgi  copy到此文件夾。

6、修改proxy.cgi文件，設置代理的服務器IP和端口：

allowedHosts = [
'openstreetmap.cz', 'www.openstreetmap.cz',
'www.openlayers.org', 'openlayers.org', 
'labs.metacarta.com', 'world.freemap.in', 
'prototype.openmnnd.org', 'geo.openplans.org',
'sigma.openplans.org',
'www.openstreetmap.org',
'toolserver.org',
"osmxapi.hypercube.telascience.org",
"nominatim.openstreetmap.org",
"open.mapquestapi.com",
"routes.cloudmade.com",

"192.168.0.32:8990"
]

7、驗證測試是否成功：

在python安裝目錄中找到並啟動python.exe, 訪問：http://localhost:8080/cgi-bin/proxy.cgi 出現home page 則說明搭建代理成功。

8、使用遠程訪問的代理：

 map.events.register('click', map, function (e) {

            OpenLayers.Util.getElement('nodelist').innerHTML = "Loading... please wait..." + map.layers[0].name;

            var url =  map.layers[0].getFullRequestString({

                            REQUEST: "GetFeatureInfo",

                            EXCEPTIONS: "application/vnd.ogc.se_xml",

                            BBOX: map.getExtent().toBBOX(),

                            X: e.xy.x,

                            Y: e.xy.y,

                            INFO_FORMAT: 'text/html',

                            QUERY_LAYERS: map.layers[0].params.LAYERS,

                            FEATURE_COUNT: 50,

                            layers: 'topp:danwei_font_point',

                            styles: '',

                            srs: 'EPSG:4326',

                            WIDTH: map.size.w,

                            HEIGHT: map.size.h},

                            http://192.168.0.32:8990/geoserver/wms

                            );

            OpenLayers.loadURL(url, '', this, setHTML, setHTML);

            Event.stop(e);

      });

其中192.168.0.32：:8990/geoserver/wms為獲取代理服務器地址。