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

package com.geoserver;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.feature.FeatureIterator;
import org.geotools.filter.text.cql2.CQL;
import org.geotools.filter.text.cql2.CQLException;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.filter.Filter;
/**
 * 采用geotools中公共查询语言
 * 过滤条件如下
 *
 * 例如：
 *    PERSONS > 15000000
 *    PERSONS BETWEEN 1000000 AND 3000000
 *    STATE_NAME LIKE 'N%'
 *    STATE_NAME = 'California'
 *    MALE > FEMALE
 *    UNEMPLOY / (EMPLOYED + UNEMPLOY) > 0.07
 *     IN ('states.1', 'states.12'):
 *   STATE_NAME IN ('New York', 'California', 'Montana', 'Texas'):
 *  带函数的使用：
 *     strToLowerCase(STATE_NAME) like ‘%m%’
 *
 *
 *
 * @Title:
 * @Description: 实现TODO
 * @Copyright:Copyright (c) 2011
 * @Company:
 * @Date:2012-9-10
 * @author  longgangbai
 * @version 1.0
 */
public class GeoServerCQLECQL {
    /**
     *
     * @param filterStr
     * @param layerName
     * @return
     * @throws IOException
     */
    public static ArrayList<SimpleFeature> queryMethod(String filterStr,String layerName) throws IOException {
        String getCapabilities = "http://localhost:8080/geoserver/wfs?REQUEST=GetCapabilities";
        Map<String,String> connectionParameters = new HashMap<String,String>();
        connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL", getCapabilities );
        // Step 2 - connection
        DataStore data = DataStoreFinder.getDataStore( connectionParameters );
        SimpleFeatureSource featureSource =data.getFeatureSource(layerName);
        ArrayList<SimpleFeature> featureList = new ArrayList<SimpleFeature>();
        if(featureSource==null)
            return featureList;
        try {
            Filter  filter = CQL.toFilter(filterStr); // filterStr形式 如  name='武汉大学' or code like 'tt123%'
            SimpleFeatureCollection result = featureSource.getFeatures(filter);

            ReferencedEnvelope bounds = new ReferencedEnvelope();
            FeatureIterator<SimpleFeature> itertor = result.features();
            while (itertor.hasNext()) {
                SimpleFeature feature = itertor.next();
                bounds.include( feature.getBounds() );
                featureList.add(feature);
            }
             System.out.println( "Calculated Bounds:"+ bounds );
            itertor.close();
            result.close( itertor );
            return featureList;
        } catch (CQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {

        }
            return null;
    }
    public static void main(String[] args) throws IOException {
         ArrayList<SimpleFeature> list=queryMethod("STATE_NAME='Arizona'","topp:states");
         System.out.println("list="+list.toString());
    }
}