OpenLayers和geowebcache结合
采用geowebcache缓存地图
1.把geowebcache服务放到tomcat应用中，假设和wms服务放在同一个tomcat中，在geowebcache/WEB-INF下面找到geowebcache-servlet.xml
在这个文件中有一段：
<bean id="gwcWMSConfig" name="code"><wmsLayer> <name>gz</name> <metaInformation> <title>gz</title> <description>gz</description> </metaInformation> <mimeFormats><string>image/jpeg</string><string>image/gif</string><string>image/png</string></mimeFormats> <!-- Grid Subset Example --> <gridSubsets> <gridSubset> <gridSetName>EPSG:4326</gridSetName> <extent> <coords> <double>112.806</double> <double>22.567</double> <double>114.287</double> <double>24.067</double> </coords> </extent> </gridSubset> </gridSubsets> <wmsUrl> <string>http://localhost:8000/wmsserver111/servlet/wms</string> </wmsUrl><wmsLayers>layers/gz/xzqj,layers/gz/ld,layers/gz/sx,layers/gz/jmd,layers/gz/gsgl,layers/gz/gd,layers/gz/sd,layers/gz/ptgl,layers/gz/ybjd,layers/gz/cgd,layers/gz/zgd,layers/gz/zfjg</wmsLayers> //此处是mapxtreme480\resources\layers下面的命名资源 <transparent>true</transparent> <bgColor></bgColor> <expireCacheList> <expirationRule minZoom="10" expiration="600" /> </expireCacheList> <expireClientsList> <expirationRule minZoom="0" expiration="7200" /> </expireClientsList> </wmsLayer>
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3.编写js代码，其他代码不变修改如下：代码见：http://ninggy.iteye.com/blog/617150
var tiled = new OpenLayers.Layer.WMS("背景图", "http://localhost:8000/geowebcache/service/wms?LAYERS=gz", { layers : 'gz', format : format }, { buffer : 0, displayOutsideMaxExtent : true, tileSize : new OpenLayers.Size(256, 256) });??
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