java 利用geotools包对wkt格式数据进行操作

引入相关pom依赖，我这边是引用全部的。利用jar包的方式引用过来的。

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-shapefile</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-shapefile-19.2.jar</systemPath>
</dependency>
<dependency>
    <groupId>org.ejml</groupId>
    <artifactId>ejml-ddense</artifactId>
    <version>0.39</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/ejml-ddense-0.32.jar</systemPath>
</dependency>
<dependency>
    <groupId>org.ejml</groupId>
    <artifactId>ejml-core</artifactId>
    <version>0.39</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/ejml-core-0.39.jar</systemPath>
</dependency>
<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-opengis</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-opengis-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-data</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-data-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-api</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-api-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-main</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-main-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-metadata</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-metadata-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-referencing</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-referencing-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-geojson</artifactId>
    <version>19.2</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/gt-geojson-19.2.jar</systemPath>
</dependency>

<dependency>
    <groupId>com.vividsolutions</groupId>
    <artifactId>jts</artifactId>
    <version>1.13</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/lib/jts-1.13.jar</systemPath>
</dependency>

相关资源包可到https://download.csdn.net/download/saygood999/86539069进行下载

1、判断点是否在面内

 WKTReader2 wktReader = new WKTReader2();
 Point point = new GeometryFactory().createPoint(new Coordinate(110.00741191345466,31.08890400396027));

 Geometry geometry = wktReader.read("MULTIPOLYGON(((110.00741191345466 31.08890400396027,112.10423570721355 31.08890400396027,112.10423570721355 35.14276333856076,110.00741191345466 35.14276333856076,110.00741191345466 31.08890400396027)))");
 StringWriter writer = new StringWriter();
 System.out.println(geometry.contains(point));

如果单纯的contains其实并不能满足正确的判断。这个方法，我发现了一个问题，如果在面的最边缘上和面进行相交与一点。这个方法是返回false的。

所以就要加上另个判断 geometry.intersects(point)相交

System.out.println(geometry.contains(point) || geometry.intersects(point));

意思满足两者任何一个就行。

2、wkb格式数据转换成geojson

 WKTReader2 wktReader = new WKTReader2();
 
 Geometry geometry = wktReader.read("MULTIPOLYGON(((110.00741191345466 31.08890400396027,112.10423570721355 31.08890400396027,112.10423570721355 35.14276333856076,110.00741191345466 35.14276333856076,110.00741191345466 31.08890400396027)))");
 StringWriter writer = new StringWriter();

 GeometryJSON geometryJSON = new GeometryJSON();
 geometryJSON.write(geometry,writer);
 System.out.println(writer.toString());

类似还有很多的方法。比较判断面积大小，其实搞过postgis的，知道函数的。在geotools上都能找到对应的方法。postgis函数推荐看这篇postgresql gis常用函数介绍_王威振的csdn的博客-CSDN博客_postgresql st函数

geotools学习文档

org.locationtech.jts:jts-core 1.19.0 API