Java解析KML文件

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colorprivate 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Documentif (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");}}
}

项目源代码：https://github.com/yzjxiaoyue/JavaParseKMLForJAK

代码参考于：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。

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