• World Wind Java开发之十三——加载Geoserver发布的WMS服务(转)


    这篇是转载的平常心博客,原地址见:http://www.v5cn.cn/?p=171

    1、WMSTiledImageLayer类说明

    一个WMSTiledImageLayer类对象只能对应一个WMS发布的服务图层,使用WMS服务时需要使用到WMS元数据描述类WMSCapabilities对象,我们使用WMSCapabilites类的静态方法retrieve来获得它的对象。WMSCapabilites对象可以包含WMS服务中所以的图层和图层样式,我们通过把需要显示的图层名称保存到AVList对象中,然后通过WMSCapabilites对象和AVList来创建WMSTiledImageLayer对象。我们可以通过一个请求地址来查看WMS服务所包含的元数据。例如:http://127.0.0.1:8080/geoserver/PostGIS/wms?request=GetGapabilities&Service=WMS 问号后面的地址是固定的,可以但看如下的XML:

    [html] view plain copy
     
     print?在CODE上查看代码片派生到我的代码片
    1. <LayerqueryableLayerqueryable="1">  
    2. <Name>spearfish</Name>  
    3. <Title>spearfish</Title>  
    4. <Abstract>Layer-Group type layer: spearfish</Abstract>  
    5. <CRS>EPSG:26713</CRS>  
    6. <EX_GeographicBoundingBox>  
    7. <westBoundLongitude>-103.87791475407893</westBoundLongitude>  
    8. <eastBoundLongitude>-103.62278893469492</eastBoundLongitude>  
    9. <southBoundLatitude>44.37246687108142</southBoundLatitude>  
    10. <northBoundLatitude>44.50235105543566</northBoundLatitude>  
    11. </EX_GeographicBoundingBox>  
    12. <BoundingBoxCRSBoundingBoxCRS="EPSG:26713"minx="589425.9342365642"miny="4913959.224611808"maxx="609518.6719560538"maxy="4928082.949945881"/>  
    13. </Layer>  
    14. <LayerqueryableLayerqueryable="1">  
    15. <Name>tasmania</Name>  
    16. <Title>tasmania</Title>  
    17. <Abstract>Layer-Group type layer: tasmania</Abstract>  
    18. <CRS>EPSG:4326</CRS>  
    19. <EX_GeographicBoundingBox>  
    20. <westBoundLongitude>143.83482400000003</westBoundLongitude>  
    21. <eastBoundLongitude>148.47914100000003</eastBoundLongitude>  
    22. <southBoundLatitude>-43.648056</southBoundLatitude>  
    23. <northBoundLatitude>-39.573891</northBoundLatitude>  
    24. </EX_GeographicBoundingBox>  
    25. <BoundingBoxCRSBoundingBoxCRS="EPSG:4326"minx="-43.648056"miny="143.83482400000003"maxx="-39.573891"maxy="148.47914100000003"/>  
    26. </Layer>  
    27. <LayerqueryableLayerqueryable="1">  
    28. <Name>tiger-ny</Name>  
    29. <Title>tiger-ny</Title>  
    30. <Abstract>Layer-Group type layer: tiger-ny</Abstract>  
    31. <CRS>EPSG:4326</CRS>  
    32. <EX_GeographicBoundingBox>  
    33. <westBoundLongitude>-74.047185</westBoundLongitude>  
    34. <eastBoundLongitude>-73.907005</eastBoundLongitude>  
    35. <southBoundLatitude>40.679648</southBoundLatitude>  
    36. <northBoundLatitude>40.882078</northBoundLatitude>  
    37. </EX_GeographicBoundingBox>  
    38. <BoundingBoxCRSBoundingBoxCRS="EPSG:4326"minx="40.679648"miny="-74.047185"maxx="40.882078"maxy="-73.907005"/>  
    39. </Layer>  
    40. <LayerqueryableLayerqueryable="1">  
    41. <Name>省界_region</Name>  
    42. <Title>省界_region</Title>  
    43. <Abstract/>  
    44. <KeywordList>  
    45. <Keyword>features</Keyword>  
    46. <Keyword>省界_region</Keyword>  
    47. </KeywordList>  
    48. <CRS>EPSG:4326</CRS>  
    49. <CRS>CRS:84</CRS>  
    50. <EX_GeographicBoundingBox>  
    51. <westBoundLongitude>73.441277</westBoundLongitude>  
    52. <eastBoundLongitude>135.08693</eastBoundLongitude>  
    53. <southBoundLatitude>18.159829</southBoundLatitude>  
    54. <northBoundLatitude>53.561771</northBoundLatitude>  
    55. </EX_GeographicBoundingBox>  
    56. <BoundingBoxCRSBoundingBoxCRS="CRS:84"minx="73.441277"miny="18.159829"maxx="135.08693"maxy="53.561771"/>  
    57. <BoundingBoxCRSBoundingBoxCRS="EPSG:4326"minx="18.159829"miny="73.441277"maxx="53.561771"maxy="135.08693"/>  
    58. <Style>  
    59. <Name>polygon_x</Name>  
    60. <Title>Default Polygon</Title>  
    61. <Abstract>A sample style that draws a polygon</Abstract>  
    62. <LegendURLwidthLegendURLwidth="20"height="20">  
    63. <Format>image/png</Format>  
    64. <OnlineResourcexmlns:xlinkOnlineResourcexmlns:xlink="http://www.w3.org/1999/xlink"xlink:type="simple"xlink:href="http://localhost:8080/geoserver/cite/ows?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&layer=%3F%3F_region"/>  
    65. </LegendURL>  
    66. </Style>  
    67. </Layer>  

    里面的每一个Layer节点都是一个WMS图层。

    2、例子

    [java] view plain copy
     
     print?在CODE上查看代码片派生到我的代码片
    1. package gov.nasa.worldwindx.v5cn;  
    2.    
    3. import gov.nasa.worldwind.avlist.AVKey;  
    4. import gov.nasa.worldwind.avlist.AVList;  
    5. import gov.nasa.worldwind.avlist.AVListImpl;  
    6. import gov.nasa.worldwind.ogc.wms.WMSCapabilities;  
    7. import gov.nasa.worldwind.wms.WMSTiledImageLayer;  
    8. import gov.nasa.worldwindx.examples.ApplicationTemplate;  
    9.    
    10. import java.net.URI;  
    11. import java.net.URISyntaxException;  
    12.    
    13. public class WMSLayerTest extends ApplicationTemplate {  
    14.     public static class AppFrame extends ApplicationTemplate.AppFrame{  
    15.    
    16.         private static final long serialVersionUID = 1L;  
    17.    
    18.         public AppFrame(){  
    19.             try {  
    20.                 //请求地图的URL  
    21.                 String uri = "http://127.0.0.1:8080/geoserver/PostGIS/wms";  
    22.                 WMSCapabilities caps;  
    23.                 URI serverURI = new URI(uri);  
    24.    
    25.                 //获得WMSCapabilities对象  
    26.                 caps = WMSCapabilities.retrieve(serverURI);  
    27.                 //解析WMSCapabilities数据  
    28.                 caps.parse();  
    29.    
    30.                 AVList params = new AVListImpl();  
    31.    
    32.                 //图层的名称  
    33.                 params.setValue(AVKey.LAYER_NAMES, "planet_osm_line");  
    34.                 //地图服务的协议,这里是OGC:WMS  
    35.                 params.setValue(AVKey.SERVICE_NAME, "OGC:WMS");  
    36.                 //获得地图的uri,也就是上面定义的uri  
    37.                 params.setValue(AVKey.GET_MAP_URL, uri);  
    38.                 //在本地缓存文件的名称  
    39.                 params.setValue(AVKey.DATA_CACHE_NAME, "planet_osm_line");  
    40.                 params.setValue(AVKey.TILE_URL_BUILDER, new WMSTiledImageLayer.URLBuilder(params));  
    41.    
    42.                 WMSTiledImageLayer imageLayer = new WMSTiledImageLayer(caps,params);  
    43.                 //图层名称  
    44.                 imageLayer.setName("planet_osm_line");  
    45.                 imageLayer.setEnabled(true);  
    46.                 //图层的透明度  
    47.                 imageLayer.setOpacity(1);  
    48.                 //图层的最大显示高度  
    49.                 imageLayer.setMaxActiveAltitude(33500000);  
    50.                 getWwd().getModel().getLayers().add(imageLayer);  
    51.                 getLayerPanel().update(getWwd());  
    52.    
    53.             } catch (URISyntaxException e) {  
    54.                 e.printStackTrace();  
    55.             } catch (Exception e) {  
    56.                 e.printStackTrace();  
    57.             }  
    58.         }  
    59.    
    60.     }  
    61. public static void main(String[] args) {  
    62.         ApplicationTemplate.start("WMS图层", WMSLayerTest.AppFrame.class);  
    63.     }  
    64. }  

    请求的URL就是GeoServer中点击【OpenLayers】中的路径:


    图层名称就是定义发布服务是的名称,可以在GeoServer中找到。

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  • 原文地址:https://www.cnblogs.com/telwanggs/p/6774710.html
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