Java解析KML文件

小咪咪 2022-04-06 04:37 398阅读 0赞

*KML*(Keyhole Markup Language,Keyhole 标记语言)最初是由Google 旗下的Keyhole 公司开发和维护的一种基于XML 的标记语言，利用XML 语法格式描述地理空间数据(如点、线、面、多边形和模型等)，适合网络环境下的地理信息协作与共享。

解决方案：获取到kml文件的根节点（kml），接下来获取第二级节点这里的情况目前看来只有两种节点（Document或Folder），接下来的情况就比较多了，可以为以上两种及PlaceMark以及其他的一些用户坐标点修饰的样式节点（style），其中PlaceMark节点，依次去解析这些节点下的子节点就可以获取到你所需的信息。

java解析kml文件只要使用了JAK（Java API For KML） 。JAK包可以通过[https://github.com/yzjxiaoyue/JavaParseKMLForJAK/raw/master/lib/JavaAPIforKml-2.2.0.jar][https_github.com_yzjxiaoyue_JavaParseKMLForJAK_raw_master_lib_JavaAPIforKml-2.2.0.jar]获取。

点：

import de.micromata.opengis.kml.v_2_2_0.Coordinate;
    
    import java.util.List;
    
    public class KmlPoint {
        private List<Coordinate> points;
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public List<Coordinate> getPoints() {
            return points;
        }
    
        public void setPoints(List<Coordinate> points) {
            this.points = points;
        }
    }

线：

import de.micromata.opengis.kml.v_2_2_0.Coordinate;
    
    import java.util.List;
    
    public class KmlLine {
        private List<Coordinate> points;
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public List<Coordinate> getPoints() {
            return points;
        }
    
        public void setPoints(List<Coordinate> points) {
            this.points = points;
        }
    }

面：

import de.micromata.opengis.kml.v_2_2_0.Coordinate;
    
    import java.util.List;
    
    /**
     * @program: ParseKMLForJava
     * @description:
     * @author: Mr.Yue
     * @create: 2018-12-04 21:12
     **/
    public class KmlPolygon {
        private List<Coordinate> points;
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public List<Coordinate> getPoints() {
            return points;
        }
    
        public void setPoints(List<Coordinate> points) {
            this.points = points;
        }
    }

封装类KmlProperty ：用于获取点线面。

import java.util.List;
    
    class KmlProperty {
        private List<KmlPoint> kmlPoints;
        private List<KmlLine> kmlLines;
        private List<KmlPolygon> kmlPolygons;
    
        public List<KmlPoint> getKmlPoints() {
            return kmlPoints;
        }
    
        public void setKmlPoints(List<KmlPoint> kmlPoints) {
            this.kmlPoints = kmlPoints;
        }
    
        public List<KmlLine> getKmlLines() {
            return kmlLines;
        }
    
        public void setKmlLines(List<KmlLine> kmlLines) {
            this.kmlLines = kmlLines;
        }
    
        public List<KmlPolygon> getKmlPolygons() {
            return kmlPolygons;
        }
    
        public void setKmlPolygons(List<KmlPolygon> kmlPolygons) {
            this.kmlPolygons = kmlPolygons;
        }
    }

KML文件解析方法：

import de.micromata.opengis.kml.v_2_2_0.*;
    
    import java.io.File;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * @program: my_project
     * @description: KML文件解析：先获取kml文件的根节点，依次遍历当前节点的子节点的信息，
     * 如果遇到节点属于Folder、Document则继续解析其子节点；反之则解析PlaceMark节点（主要解析LineString、Point、Polygon）。
     * @author: Yue
     * @create: 2018-12-01 12:39
     **/
    public class ParsingKmlUtil {
        //以下三行都是自定义的KML类，用于获取名称name、所有点points、样式颜色color
        private List<KmlPoint> kmlPointList = new ArrayList<>();
        private List<KmlLine> kmlLineList = new ArrayList<>();
        private List<KmlPolygon> kmlPolygonList = new ArrayList<>();
        private KmlProperty kmlProperty = new KmlProperty();
    
        /**
         * 保存kml数据到临时表
         *
         * @param file 上传的文件实体
         * @return 自定义的KML文件实体
         */
        public KmlProperty parseKmlForJAK(File file) {
            Kml kml = Kml.unmarshal(file);
            Feature feature = kml.getFeature();
            parseFeature(feature);
            kmlProperty.setKmlPoints(kmlPointList);
            kmlProperty.setKmlLines(kmlLineList);
            kmlProperty.setKmlPolygons(kmlPolygonList);
            return kmlProperty;
        }
    
        /**
         * 解析kml节点信息
         *
         * @param feature 需要解析到要素信息
         * @return
         */
        private void parseFeature(Feature feature) {
            if (feature != null) {
                //判断根节点是否为Document
                if (feature instanceof Document) {
                    List<Feature> featureList = ((Document) feature).getFeature();
                    //遍历已获取的节点信息(节点信息为List)，将list使用forEach进行遍历（同for、while）
                    featureList.forEach(documentFeature -> {
                                //判断遍历节点是否为PlaceMark，否则迭代解析
                                if (documentFeature instanceof Placemark) {
                                    getPlaceMark((Placemark) documentFeature);
                                } else {
                                    parseFeature(documentFeature);
                                }
                            }
                    );
                } else if (feature instanceof Folder) {
                    //原理同上
                    List<Feature> featureList = ((Folder) feature).getFeature();
                    featureList.forEach(documentFeature -> {
                                if (documentFeature instanceof Placemark) {
                                    getPlaceMark((Placemark) documentFeature);
                                }
                                {
                                    parseFeature(documentFeature);
                                }
                            }
                    );
                }
            }
        }
    
        /**
         * 解析PlaceMark节点下的信息
         *
         * @return
         */
        private void getPlaceMark(Placemark placemark) {
            Geometry geometry = placemark.getGeometry();
            String name = placemark.getName();
            parseGeometry(name, geometry);
        }
    
        /**
         * 解析PlaceMark节点下的信息
         *
         * @return
         */
        private void parseGeometry(String name, Geometry geometry) {
            if (geometry != null) {
                if (geometry instanceof Polygon) {
                    Polygon polygon = (Polygon) geometry;
                    Boundary outerBoundaryIs = polygon.getOuterBoundaryIs();
                    if (outerBoundaryIs != null) {
                        LinearRing linearRing = outerBoundaryIs.getLinearRing();
                        if (linearRing != null) {
                            List<Coordinate> coordinates = linearRing.getCoordinates();
                            if (coordinates != null) {
                                outerBoundaryIs = ((Polygon) geometry).getOuterBoundaryIs();
                                addPolygonToList(kmlPolygonList, name, outerBoundaryIs);
                            }
                        }
                    }
                } else if (geometry instanceof LineString) {
                    LineString lineString = (LineString) geometry;
                    List<Coordinate> coordinates = lineString.getCoordinates();
                    if (coordinates != null) {
                        coordinates = ((LineString) geometry).getCoordinates();
                        addLineStringToList(kmlLineList, coordinates, name);
                    }
                } else if (geometry instanceof Point) {
                    Point point = (Point) geometry;
                    List<Coordinate> coordinates = point.getCoordinates();
                    if (coordinates != null) {
                        coordinates = ((Point) geometry).getCoordinates();
                        addPointToList(kmlPointList, coordinates, name);
                    }
                } else if (geometry instanceof MultiGeometry) {
                    List<Geometry> geometries = ((MultiGeometry) geometry).getGeometry();
                    for (Geometry geometryToMult : geometries) {
                        Boundary outerBoundaryIs;
                        List<Coordinate> coordinates;
                        if (geometryToMult instanceof Point) {
                            coordinates = ((Point) geometryToMult).getCoordinates();
                            addPointToList(kmlPointList, coordinates, name);
                        } else if (geometryToMult instanceof LineString) {
                            coordinates = ((LineString) geometryToMult).getCoordinates();
                            addLineStringToList(kmlLineList, coordinates, name);
                        } else if (geometryToMult instanceof Polygon) {
                            outerBoundaryIs = ((Polygon) geometryToMult).getOuterBoundaryIs();
                            addPolygonToList(kmlPolygonList, name, outerBoundaryIs);
                        }
                    }
                }
            }
        }
    
        /**
         * 将kml中所有面添加到一个list
         *
         * @return
         */
        private void addPolygonToList(List<KmlPolygon> kmlPolygonList, String name, Boundary outerBoundaryIs) {
            LinearRing linearRing;
            List<Coordinate> coordinates;
            linearRing = outerBoundaryIs.getLinearRing();//面
            coordinates = linearRing.getCoordinates();
            KmlPolygon kmlPolygon = new KmlPolygon();
            kmlPolygon.setPoints(coordinates);
            kmlPolygon.setName(name);
            kmlPolygonList.add(kmlPolygon);
        }
    
        /**
         * 将kml中所有线添加到一个list
         *
         * @return
         */
        private void addLineStringToList(List<KmlLine> kmlLineList, List<Coordinate> coordinates, String name) {
            KmlLine kmlLine = new KmlLine();
            kmlLine.setPoints(coordinates);
            kmlLine.setName(name);
            kmlLineList.add(kmlLine);
        }
    
        /**
         * 将kml中所有点添加到一个list
         *
         * @return
         */
        private void addPointToList(List<KmlPoint> kmlPointList, List<Coordinate> coordinates, String name) {
            KmlPoint kmlPoint = new KmlPoint();
            kmlPoint.setName(name);
            kmlPoint.setPoints(coordinates);
            kmlPointList.add(kmlPoint);
        }
    }

KML解析方法调用：

import java.io.File;
    public class Main {
        public static void main(String[] args) {
            KmlProperty kmlProperty;
            ParsingKmlUtil parsingKmlUtil =new ParsingKmlUtil();
            File file = new File("src/point.kml");
            kmlProperty = parsingKmlUtil.parseKmlForJAK(file);
            assert kmlProperty != null;
    
            if (kmlProperty.getKmlPoints().size() > 0) {
                for (KmlPoint k : kmlProperty.getKmlPoints()) {
                    System.out.println(k.getName());
                }
                System.out.println("点");
            }
            if (kmlProperty.getKmlLines().size() > 0) {
                for (KmlLine k : kmlProperty.getKmlLines()) {
                    System.out.println(k.getName());
                }
                System.out.println("线");
            }
            if (kmlProperty.getKmlPoints().size() > 0) {
                for (KmlPoint k : kmlProperty.getKmlPoints()) {
                    System.out.println(k.getPoints());
                }
                System.out.println("面");
            }
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l6al94aWFveXVl_size_16_color_FFFFFF_t_70][]

项目源代码：[https://github.com/yzjxiaoyue/JavaParseKMLForJAK][https_github.com_yzjxiaoyue_JavaParseKMLForJAK]

代码参考于：[https://stackoverrun.com/cn/q/4243988\#47576837][https_stackoverrun.com_cn_q_4243988_47576837]，之前写的使用Groovy，经过理解和修改得到以上代码。

[https_github.com_yzjxiaoyue_JavaParseKMLForJAK_raw_master_lib_JavaAPIforKml-2.2.0.jar]: https://github.com/yzjxiaoyue/JavaParseKMLForJAK/raw/master/lib/JavaAPIforKml-2.2.0.jar
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l6al94aWFveXVl_size_16_color_FFFFFF_t_70]: /images/20220406/bcd25f1b75f34f2b9d5f1c7ebb660920.png
[https_github.com_yzjxiaoyue_JavaParseKMLForJAK]: https://github.com/yzjxiaoyue/JavaParseKMLForJAK
[https_stackoverrun.com_cn_q_4243988_47576837]: https://stackoverrun.com/cn/q/4243988#47576837