155 lines
4.5 KiB
Markdown
155 lines
4.5 KiB
Markdown
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---
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title: GeoTools-快速起步
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date: 2023-11-19
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author: ac
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categries:
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- GIS
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tags:
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- GeoTools
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---
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### GeoTools-快速起步
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#### 1.maven构建
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```shell
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mvn archetype:generate -DgroupId=org.geotools -DartifactId=tutorial -Dversion=1.0-SNAPSHOT -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-quickstart
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```
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> archetype的意思就是模板原型的意思，原型是一个Maven项目模板工具包。
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#### 2. 添加依赖
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```xml
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.7</maven.compiler.source>
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<maven.compiler.target>1.7</maven.compiler.target>
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<!-- 指定geotools的版本号-->
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<geotools.version>31-SNAPSHOT</geotools.version>
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<maven.deploy.skip>true</maven.deploy.skip>
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</properties>
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<!-- 添加仓库地址-->
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<repositories>
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<repository>
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<id>osgeo</id>
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<name>OSGeo Release Repository</name>
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<url>https://repo.osgeo.org/repository/release/</url>
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<snapshots><enabled>false</enabled></snapshots>
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<releases><enabled>true</enabled></releases>
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</repository>
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<repository>
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<id>osgeo-snapshot</id>
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<name>OSGeo Snapshot Repository</name>
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<url>https://repo.osgeo.org/repository/snapshot/</url>
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<snapshots><enabled>true</enabled></snapshots>
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<releases><enabled>false</enabled></releases>
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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13.2</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.geotools</groupId>
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<artifactId>gt-shapefile</artifactId>
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<version>${geotools.version}</version>
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</dependency>
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<dependency>
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<groupId>org.geotools</groupId>
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<artifactId>gt-swing</artifactId>
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<version>${geotools.version}</version>
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</dependency>
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</dependencies>
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```
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#### 3. 主程序
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```java
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import java.io.File;
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import java.util.logging.Logger;
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import org.geotools.api.data.FileDataStore;
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import org.geotools.api.data.FileDataStoreFinder;
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import org.geotools.api.data.SimpleFeatureSource;
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import org.geotools.map.FeatureLayer;
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import org.geotools.map.Layer;
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import org.geotools.map.MapContent;
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import org.geotools.styling.SLD;
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import org.geotools.api.style.Style;
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import org.geotools.swing.JMapFrame;
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import org.geotools.swing.data.JFileDataStoreChooser;
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/**
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* Prompts the user for a shapefile and displays the contents on the screen in a map frame.
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*
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* <p>This is the GeoTools Quickstart application used in documentationa and tutorials. *
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*/
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public class Quickstart {
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/**
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* GeoTools Quickstart demo application.
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* Prompts the user for a shapefile and displays its
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* contents on the screen in a map frame
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*/
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public static void main(String[] args) throws Exception {
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File file = JFileDataStoreChooser.showOpenFile("shp", null);
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if (file == null) {
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return;
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}
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FileDataStore store = FileDataStoreFinder.getDataStore(file);
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SimpleFeatureSource featureSource = store.getFeatureSource();
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// Create a map content and add our shapefile to it
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MapContent map = new MapContent();
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map.setTitle("Quickstart");
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Style style = SLD.createSimpleStyle(featureSource.getSchema());
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Layer layer = new FeatureLayer(featureSource, style);
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map.addLayer(layer);
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// Now display the map
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JMapFrame.showMap(map);
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}
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}
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```
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选择一份`shp`文件，程序会读取该文件添加到mapContent面板中。
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<img src="./images/image-20231120142008338.png" alt="image-20231120142008338" style="zoom: 80%;" />
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注意：shp文件没有被加载到内存中，而是每次需要时都从磁盘读取它。这种方式允许您处理大于内存的数据集。
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#### 4. advance
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为了更好的交互体验，我们可以通过`DataStoreFinder`获取数据源时添加额外的参数，如设置缓存、创建空间索引等方法来优化。
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```java
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File file = JFileDataStoreChooser.showOpenFile("shp", null);
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Map<String, Object> params = new HashMap<>();
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params.put("url", file.toURI().toURL());
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params.put("create spatial index", true);
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params.put("memory mapped buffer", true);
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params.put("charset", "UTF-8");
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DataStore store = DataStoreFinder.getDataStore(params);
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SimpleFeatureSource featureSource = store.getFeatureSource(store.getTypeNames()[0]);
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```
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