动态颜色参数样式、动态sql
访问方式：
http://localhost:20011/geoserver/gzzjygis/wms?service=WMS&version=1.1.0&request=GetMap&layers=layername&bbox=103.804856%2C24.869804%2C109.336088%2C29.12673&width=768&height=591&srs=EPSG%3A4326&format=application/openlayers&viewparams=paramcolor:00ff00;type:A
样式设置：
<?xml version="1.0" encoding="UTF-8"?>
<StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><!-- a Named Layer is the basic building block of an SLD document --><NamedLayer><Name>default_point</Name><UserStyle><!-- Styles can have names, titles and abstracts --><Title>Default Point</Title><Abstract>A sample style that draws a point</Abstract><!-- FeatureTypeStyles describe how to render different features --><!-- A FeatureTypeStyle for rendering points --><FeatureTypeStyle><Rule><Name>rule1</Name><Title>Red Square</Title><Abstract>A 6 pixel square with a red fill and no stroke</Abstract><PointSymbolizer><Graphic><Mark><WellKnownName>circle</WellKnownName><Fill><CssParameter name="fill"><ogc:PropertyName>paramcolor</ogc:PropertyName></CssParameter></Fill></Mark><Size>6</Size></Graphic></PointSymbolizer></Rule></FeatureTypeStyle></UserStyle></NamedLayer>
</StyledLayerDescriptor>视图sql设置：
select dataid, dataname,d.the_geom,'#%paramcolor%' as paramcolor from d
where apt_code ='%type%'
提取 paramcolor和type为动态参数
