geoserver中除了使用kml来查询数据以外，还可以使用csql或ecsql

1. package com.geoserver;
2. import java.io.IOException;
3. import java.util.ArrayList;
4. import java.util.HashMap;
5. import java.util.Map;
6. import org.geotools.data.DataStore;
7. import org.geotools.data.DataStoreFinder;
8. import org.geotools.data.simple.SimpleFeatureCollection;
9. import org.geotools.data.simple.SimpleFeatureSource;
10. import org.geotools.feature.FeatureIterator;
11. import org.geotools.filter.text.cql2.CQL;
12. import org.geotools.filter.text.cql2.CQLException;
13. import org.geotools.geometry.jts.ReferencedEnvelope;
14. import org.opengis.feature.simple.SimpleFeature;
15. import org.opengis.filter.Filter;
16. /**
17. * 采用geotools中公共查询语言
18. * 过滤条件如下
19. *
20. * 例如：
21. *    PERSONS > 15000000
22. *    PERSONS BETWEEN 1000000 AND 3000000
23. *    STATE_NAME LIKE 'N%'
24. *    STATE_NAME = 'California'
25. *    MALE > FEMALE
26. *    UNEMPLOY / (EMPLOYED + UNEMPLOY) > 0.07
27. *     IN ('states.1', 'states.12'):
28. *   STATE_NAME IN ('New York', 'California', 'Montana', 'Texas'):
29. *  带函数的使用：
30. *     strToLowerCase(STATE_NAME) like ‘%m%’
31. *
32. *
33. *
34. * @Title:
35. * @Description: 实现TODO
36. * @Copyright:Copyright (c) 2011
37. * @Company:
38. * @Date:2012-9-10
39. * @author  longgangbai
40. * @version 1.0
41. */
42. public class GeoServerCQLECQL {
43. /**
44. *
45. * @param filterStr
46. * @param layerName
47. * @return
48. * @throws IOException
49. */
50. public static ArrayList<SimpleFeature> queryMethod(String filterStr,String layerName) throws IOException {
51. String getCapabilities = "http://localhost:8080/geoserver/wfs?REQUEST=GetCapabilities";
52. Map<String,String> connectionParameters = new HashMap<String,String>();
53. connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL", getCapabilities );
54. // Step 2 - connection
55. DataStore data = DataStoreFinder.getDataStore( connectionParameters );
56. SimpleFeatureSource featureSource =data.getFeatureSource(layerName);
57. ArrayList<SimpleFeature> featureList = new ArrayList<SimpleFeature>();
58. if(featureSource==null)
59. return featureList;
60. try {
61. Filter  filter = CQL.toFilter(filterStr); // filterStr形式 如  name='武汉大学' or code like 'tt123%'
62. SimpleFeatureCollection result = featureSource.getFeatures(filter);
63. ReferencedEnvelope bounds = new ReferencedEnvelope();
64. FeatureIterator<SimpleFeature> itertor = result.features();
65. while (itertor.hasNext()) {
66. SimpleFeature feature = itertor.next();
67. bounds.include( feature.getBounds() );
68. featureList.add(feature);
69. }
70. System.out.println( "Calculated Bounds:"+ bounds );
71. itertor.close();
72. result.close( itertor );
73. return featureList;
74. } catch (CQLException e) {
75. // TODO Auto-generated catch block
76. e.printStackTrace();
77. } catch (IOException e) {
78. // TODO Auto-generated catch block
79. e.printStackTrace();
80. }finally {
81. }
82. return null;
83. }
84. public static void main(String[] args) throws IOException {
85. ArrayList<SimpleFeature> list=queryMethod("STATE_NAME='Arizona'","topp:states");
86. System.out.println("list="+list.toString());
87. }
88. }