jena sparql rdf java

RDF文件内容：

<rdf:RDF
	xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
	xmlns:uni="http://www.mydomain.org/uni-ns#"
	xmlns:id="http://www.mydomain.org/id-ns#"
	>
	<rdf:Description rdf:about="id:949352">
		<uni:name>Grigoris Antoniou</uni:name>
		<uni:title>教授</uni:title>
	</rdf:Description>
	<rdf:Description rdf:about="id:949318">
		<uni:name>David Billington</uni:name>
		<uni:title>副教授</uni:title>
	</rdf:Description>
	<rdf:Description rdf:about="id:949111">
		<uni:name>Michael Maher</uni:name>
		<uni:title>教授</uni:title>
	</rdf:Description>
	<rdf:Description rdf:about="id:CIT1111">
		<uni:courseName>离散数学</uni:courseName>
		<uni:isTaughtBy>David Billington</uni:isTaughtBy>
	</rdf:Description>
	<rdf:Description rdf:about="id:CIT1112">
		<uni:courseName>具体数学</uni:courseName>
		<uni:isTaughtBy>Grigoris Antoniou</uni:isTaughtBy>
	</rdf:Description>
	<rdf:Description rdf:about="id:CIT2112">
		<uni:courseName>程序设计</uni:courseName>
		<uni:isTaughtBy>Michael Maher</uni:isTaughtBy>
	</rdf:Description>
	<rdf:Description rdf:about="id:CIT3112">
		<uni:courseName>计算理论</uni:courseName>
		<uni:isTaughtBy>David Billington</uni:isTaughtBy>
	</rdf:Description>
	<rdf:Description rdf:about="id:CIT3116">
		<uni:courseName>知识表示</uni:courseName>
		<uni:isTaughtBy>Grigoris Antoniou</uni:isTaughtBy>
	</rdf:Description>
</rdf:RDF>

在官网下载jena包，导入到程序中即可，jena下载地址：http://jena.apache.org/

java源程序：（记得改包名和文件路径名）

package rdf;

import java.io.InputStream;

import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.RDFNode;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.util.FileManager;

public class jena_sparql_rdf {
	public static void main(String[] args) {
		//创建模型并读取rdf文件
		String inputfileName = "/semanticWeb/src/rdf/files.rdf";
		Model model = ModelFactory.createDefaultModel();
		InputStream open = FileManager.get().open(inputfileName);
		
		model.read(open, "","RDF/XML");
		//编写查询语句
//		String select ="SELECT  ?sub ?pre WHERE {?sub ?pre \"教授\"}";
//		String select ="SELECT  ?teacher WHERE {?sub uni:title \"教授\".?sub uni:name ?teacher}";
		String select ="SELECT * WHERE {?sub ?pre ?obj}";
		String queryString = 
			    "PREFIX uni:<http://www.mydomain.org/uni-ns#>"
			    + "PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>"
			    + "PREFIX id:<http://www.mydomain.org/id-ns#>"+select;

		//创建查询
		Query query = QueryFactory.create(queryString);
		//执行查询
		QueryExecution qe = QueryExecutionFactory.create(query, model);
		//返回查询结果
		ResultSet results = qe.execSelect();
		//输出查询结果
		System.out.println("遍历结果集依次输出结果：");
		while(results.hasNext()){
			QuerySolution next = results.next();
			Resource resource = next.getResource("sub");
			RDFNode rdfNode = next.get("pre");
			Literal literal = next.getLiteral("obj");
			
			System.out.println(resource+"\t"+rdfNode+"\t"+literal);
		}
		
		
//		System.out.println("按格式输出结果：");
//		ResultSetFormatter.out(System.out, results, query);
		
		//关闭QueryExecution链接
		qe.close();

	}
}