Java 和 Geoserver 发布矢量切片教程

本文将详细介绍使用 Java 代码和 Geoserver 发布矢量切片的步骤，并提供示例代码。

1. Java 代码

import java.net.URL;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.DefaultTransaction;
import org.geotools.data.Transaction;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.data.simple.SimpleFeatureStore;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.factory.GeoTools;
import org.geotools.factory.Hints;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.filter.text.cql2.CQL;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.MapContext;
import org.geotools.styling.FeatureTypeStyle;
import org.geotools.styling.Rule;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.styling.StyleBuilder;
import org.geotools.styling.Symbolizer;
import org.geotools.styling.TextSymbolizer;
import org.geotools.swing.JMapFrame;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.Point;
import org.opengis.feature.Feature;
import org.opengis.feature.Property;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.FilterFactory2;
import org.opengis.filter.identity.FeatureId;

public class VectorTiling {

    public static void main(String[] args) throws Exception {

        // 设置数据源
        URL url = new URL('http://localhost:8080/geoserver/wfs?service=WFS&version=1.0.0&request=GetFeature&typeName=topp:states&outputFormat=json');
        DataStore dataStore = DataStoreFinder.getDataStore(null);
        SimpleFeatureSource featureSource = dataStore.getFeatureSource('topp:states');

        // 创建一个要素集合
        FeatureCollection<SimpleFeatureType, SimpleFeature> featureCollection = featureSource.getFeatures();

        // 创建一个简单要素类型构建器
        SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
        builder.setName('MyFeatureType');
        builder.setCRS(featureSource.getSchema().getCoordinateReferenceSystem());
        builder.add('geom', Point.class);
        builder.add('name', String.class);
        builder.add('population', Integer.class);

        // 创建一个简单要素构建器
        SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(builder.buildFeatureType());

        // 创建一个地图上下文
        MapContext map = new DefaultMapContext();
        map.setTitle('My Map');

        // 创建一个样式构建器
        StyleBuilder styleBuilder = new StyleBuilder();

        // 创建一个点符号化器
        Symbolizer symbolizer = styleBuilder.createPointSymbolizer(styleBuilder.createGraphic(null, styleBuilder.createMark('circle', null, null), null), null);
        TextSymbolizer textSymbolizer = styleBuilder.createTextSymbolizer(styleBuilder.createFill(), styleBuilder.createHalo(), 'name', null);

        // 创建一个要素类型样式
        FeatureTypeStyle featureTypeStyle = styleBuilder.createFeatureTypeStyle(new Symbolizer[] { symbolizer, textSymbolizer });

        // 创建一个规则
        Rule rule = styleBuilder.createRule(featureTypeStyle);

        // 创建一个样式
        Style style = SLD.wrapSymbolizers(symbolizer, textSymbolizer);

        // 将样式添加到地图中
        map.addLayer(featureSource, style);

        // 创建一个事务
        Transaction transaction = new DefaultTransaction('create');

        // 创建一个要素存储
        SimpleFeatureStore featureStore = (SimpleFeatureStore) dataStore.getFeatureSource('MyFeatureType');

        // 添加要素
        featureStore.setTransaction(transaction);
        try (FeatureIterator<SimpleFeature> features = featureCollection.features()) {
            while (features.hasNext()) {
                SimpleFeature feature = features.next();
                Point point = (Point) feature.getDefaultGeometry();
                String name = feature.getAttribute('STATE_NAME').toString();
                Integer population = Integer.parseInt(feature.getAttribute('POP2000').toString());
                featureBuilder.add(point);
                featureBuilder.add(name);
                featureBuilder.add(population);
                SimpleFeature newFeature = featureBuilder.buildFeature(null);
                featureStore.addFeatures(DataUtilities.collection(newFeature));
            }
        }
        transaction.commit();

        // 关闭数据存储
        dataStore.dispose();

        // 显示地图
        JMapFrame.showMap(map);
    }
}

2. Geoserver 发布矢量切片

在 Geoserver 管理界面中，选择要发布的数据集，进入“发布”页面。
选择“矢量切片”选项。
在“矢量切片”页面中，设置矢量切片的参数，如切片大小、坐标系、图层等。
点击“发布”按钮即可完成矢量切片的发布。

总结

本文介绍了使用 Java 代码和 Geoserver 发布矢量切片的步骤和方法。希望这篇文章对您有所帮助。