KML(Keyhole Markup Language,Keyhole 標記語言)最初是由Google 旗下的Keyhole 公司開發和維護的一種基於XML 的標記語言，利用XML 語法格式描述地理空間數據(如點、線、面、多邊形和模型等)，適合網絡環境下的地理信息協作與共享。
java解析kml文件只要使用了JAK（Java API For KML） 。JAK包可以通過https://github.com/yzjxiaoyue/JavaParseKMLForJAK/raw/master/lib/JavaAPIforKml-2.2.0.jar獲取。
點：
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;
}
}
線：
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;
}
}
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：先獲取kml文件的根節點，依次遍歷當前節點的子節點的信息，
* 如果遇到節點屬於Folder、Document則繼續解析其子節點；反之則解析PlaceMark節點（主要解析LineString、Point、Polygon）。
* @author: Yue
* @create: 2018-12-01 12:39
**/
public class ParsingKmlUtil {
//以下三行都是自定義的KML類，用於獲取名稱name、所有點points、樣式顏色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數據到臨時表
*
* @param file 上傳的文件實體
* @return 自定義的KML文件實體
*/
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節點信息
*
* @param feature 需要解析到要素信息
* @return
*/
private void parseFeature(Feature feature) {
if (feature != null) {
//判斷根節點是否爲Document
if (feature instanceof Document) {
List<Feature> featureList = ((Document) feature).getFeature();
//遍歷已獲取的節點信息(節點信息爲List)，將list使用forEach進行遍歷（同for、while）
featureList.forEach(documentFeature -> {
//判斷遍歷節點是否爲PlaceMark，否則迭代解析
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節點下的信息
*
* @return
*/
private void getPlaceMark(Placemark placemark) {
Geometry geometry = placemark.getGeometry();
String name = placemark.getName();
parseGeometry(name, geometry);
}
/**
* 解析PlaceMark節點下的信息
*
* @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);
}
}
}
}
}
/**
* 將kml中所有面添加到一個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);
}
/**
* 將kml中所有線添加到一個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);
}
/**
* 將kml中所有點添加到一個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解析方法調用：
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("點");
}
if (kmlProperty.getKmlLines().size() > 0) {
for (KmlLine k : kmlProperty.getKmlLines()) {
System.out.println(k.getName());
}
System.out.println("線");
}
if (kmlProperty.getKmlPoints().size() > 0) {
for (KmlPoint k : kmlProperty.getKmlPoints()) {
System.out.println(k.getPoints());
}
System.out.println("面");
}
}
}
項目源代碼：https://github.com/yzjxiaoyue/JavaParseKMLForJAK
代碼參考於：https://stackoverrun.com/cn/q/4243988#47576837，之前寫的使用Groovy，經過理解和修改得到以上代碼。