无法使用geoTools获取FeaturesCollection中的内容
无法使用geoTools获取FeaturesCollection中的内容
提问于 2020-01-25 18:21:43
我正在使用geoTools库。我的目标是从geoServer返回特性。我已正确连接到dataStore，但无法接收集合功能的内容。
当我尝试的时候：
SimpleFeatureCollection collection = featureSource.getFeatures();在欺骗我的代码时，collectionFeature的响应包含cashedSize = -1，typeContent包含正确的propertyNames，但没有特征数据。
我认为问题出在依赖项中，但我无法修复它。
这是我的代码：
CRS.decode("EPSG:4326", true);
// URL
StringBuilder completeUrl = new StringBuilder();
completeUrl.append(url);
completeUrl.append("/geoserver/wfs?SERVICE=wfs&version=");
completeUrl.append(version);
completeUrl.append("&REQUEST=GetCapabilities");
String getCapabilities = completeUrl.toString();
logger.info("URL" + getCapabilities);
// Connexion to WFS
Map<String, String> connectionParameters = new HashMap<String, String>();
connectionParameters.put("WFSDataStoreFactory:GET_CAPABILITIES_URL", getCapabilities);
connectionParameters.put("WFSDataStoreFactory:MAXFEATURES", "50");
DataStore dataStore = DataStoreFinder.getDataStore(connectionParameters);
SimpleFeatureSource featureSource = dataStore.getFeatureSource(layer);
SimpleFeatureCollection collection = featureSource.getFeatures();
return collection; `和我的POM.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-shapefile -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-shapefile</artifactId>
<version>22.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-main -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-main</artifactId>
<version>21.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-cql -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-cql</artifactId>
<version>21.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-opengis -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-opengis</artifactId>
<version>21.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-epsg-hsql -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-hsql</artifactId>
<version>22.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-wfs -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-wfs</artifactId>
<version>11.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>maven2-repository.dev.java.net</id>
<name>Java.net repository</name>
<url>http://download.java.net/maven/2</url>
</repository>
<repository>
<id>osgeo</id>
<name>Open Source Geospatial Foundation Repository</name>
<url>http://download.osgeo.org/webdav/geotools/</url>
</repository>
<repository>
<id>opengeo</id>
<name>OpenGeo Maven Repository</name>
<url>http://repo.opengeo.org</url>
</repository>
</repositories>
</project>谢谢
回答 1
Stack Overflow用户
发布于 2020-01-26 03:13:11
如果计算功能的数量开销太大，功能集合可能会返回-1。这取决于数据存储，例如Postgis可以快速计数，而geojson不能，因为它必须读取和处理整个文件。
尝试通过从集合中获取迭代器来使用集合。
更新
更仔细地查看您的pom.xml会发现另一个问题：
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-epsg-hsql</artifactId>
<version>22.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.geotools/gt-wfs -->
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-wfs</artifactId>
<version>11.2</version>
</dependency>您正在混合GeoTools的版本，这可能会很糟糕，而且您可能希望使用较新的gt-wfs-ng模块，而不是gt-wfs模块。
更新2
我在本地GeoServer中使用了以下代码，没有出现任何问题。
String getCapabilities = "http://localhost:8080/geoserver/ows?service=wfs&version=1.1.0&request=GetCapabilities";
Map<String, Serializable> connectionParameters = new HashMap<>();
connectionParameters.put(WFSDataStoreFactory.URL.key, getCapabilities);
connectionParameters.put(WFSDataStoreFactory.TIMEOUT.key, 10000000);
WFSDataStoreFactory dsf = new WFSDataStoreFactory();
try {
WFSDataStore dataStore = dsf.createDataStore(connectionParameters);
String types[] = dataStore.getTypeNames();
for (int i = 0; i < types.length; i++) {
System.out.println(types[i]);
String name = types[i];
Query query = new Query(name);
SimpleFeatureSource source = dataStore.getFeatureSource(name);
SimpleFeatureType schema = source.getSchema();
// System.out.println(schema);
query.setMaxFeatures(10);
SimpleFeatureCollection fc = source.getFeatures(query);
try (SimpleFeatureIterator itr = fc.features()) {
while (itr.hasNext()) {
SimpleFeature sf = itr.next();
System.out.println(sf);
}
}
}
} catch (IOException ex) {
ex.printStackTrace();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59908331
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