java jena owl
时间: 2023-12-05 14:41:39 浏览: 38
Java Jena是一个用于处理语义网数据的Java框架,它支持RDF,OWL和SPARQL等语义网技术。下面是一个简单的Java Jena OWL例子:
1. 首先,需要在pom.xml文件中添加以下依赖项:
```xml
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>apache-jena-libs</artifactId>
<version>3.5.0</version>
</dependency>
```
2. 然后,可以使用以下代码加载本地OWL文件并查询:
```java
import org.apache.jena.ontology.OntModel;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.util.FileManager;
public class JenaOWLExample {
public static void main(String[] args) {
// 加载本地OWL文件
String inputFileName = "example.owl";
OntModel model = ModelFactory.createOntologyModel();
InputStream in = FileManager.get().open(inputFileName);
if (in == null) {
throw new IllegalArgumentException("File: " + inputFileName + " not found");
}
model.read(in, null);
// 查询OWL模型
String queryString = "PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>\n" +
"PREFIX owl: <http://www.w3.org/2002/07/owl#>\n" +
"PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n" +
"SELECT ?subject ?predicate ?object\n" +
"WHERE { ?subject ?predicate ?object }";
Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(query, model);
ResultSet results = qe.execSelect();
ResultSetFormatter.out(System.out, results, query);
// 释放资源
qe.close();
}
}
```
上述代码将加载名为“example.owl”的本地OWL文件,并查询所有三元组。可以根据需要修改查询字符串以获取所需的结果。