将 Apache Jena 与 Blazegraph 一起用作 Triplestore

Question

对于一个项目，我必须结合使用 Apache Jena 和 Blazegraph 作为三重存储。但是我在使用 RDFConnection 将 Jena 连接到 Blazegraph 时遇到了问题。

RDFConnection conn = RDFConnectionFactory.connect(...)
conn.load("data.ttl") ;
QueryExecution qExec = conn.query("SELECT DISTINCT ?s { ?s ?p ?o }") ;
ResultSet rs = qExec.execSelect() ;
while(rs.hasNext()) {
    QuerySolution qs = rs.next() ;
    Resource subject = qs.getResource("s") ;
    System.out.println("Subject: "+subject) ;
}
qExec.close() ;
conn.close() ;

Blazegraph（包括其网络界面）是运行。这是命令行输出。

Welcome to the Blazegraph(tm) Database.

Go to http://192.168.222.1:9999/blazegraph/ to get started. WARN : MapgraphServletProxy.java:67: Running without GPU Acceleration. See >https://www.blazegraph.com/product/gpu-accelerated/.

我已经阅读了 https://github.com/apache/jena/tree/master/jena-rdfconnection/src/main/java/org/apache/jena/rdfconnection/examples

中的示例

RDFConnection conn = RDFConnectionFactory.connect("http://192.168.222.1:9999/blazegraph/");
conn.load("d:\data.ttl") ;

导致：

Exception in thread "main" org.apache.jena.atlas.web.HttpException: 404 - Not Found

在 conn.load("d:\data.ttl") ;

使用“http://192.168.222.1:9999”作为目标会导致相同的异常。

使用“http://192.168.222.1/blazegraph" or "http://192.168.222.1”

导致：

Exception in thread "main" org.apache.jena.atlas.web.HttpException: org.apache.http.conn.HttpHostConnectException: Connect to 192.168.222.1:80 [/192.168.222.1] failed: Connection refused: connect

在 conn.load("data.ttl") ；还有。

你能帮我找到正确的连接方式吗？

Answer 1

问题的一种解决方案

String APIUrl = "http://192.168.222.1:9999/bigdata/sparql";
RDFConnection conn = RDFConnectionFactory.connect(APIUrl,APIUrl,APIUrl);

https://jena.apache.org/documentation/javadoc/rdfconnection/org/apache/jena/rdfconnection/RDFConnectionFactory.html#connect-java.lang.String-java.lang.String-java.lang.String-

将 Apache Jena 与 Blazegraph 一起用作 Triplestore

Using Apache Jena with Blazegraph as Triplestore

java

jena

blazegraph