Java 如何将JENA Sparql查询结果集保存为JSON？

如何将JENA结果集存储为JSON格式的字符串？我目前只能将结果集输出到System.out控制台，但无法将其保存为java字符串。这是我所处位置的一个例子：

QueryExecution qexec = QueryExecutionFactory.sparqlService(endpoint, query);
ResultSet results = qexec.execSelect();
// the following prints out JSON in the System.out console:
ResultSetFormatter.outputAsJSON(System.out, results);
// but how do I save it as a String?
// ie.  
String json = ResultSetFormatter.outputAsJSON(System.out, results);
// obviously that doesn't work, but how would one get the equivalent working version?

我希望能够将JSON变量发送到另一个方法以对其执行一些工作

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提前谢谢

尝试通过tearrayoutputstream写入

并将字节从中转换为
字符串

QueryExecution qexec = QueryExecutionFactory.sparqlService(sparqlEndpointQuery, query);
ResultSet results = qexec.execSelect();

// write to a ByteArrayOutputStream
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

ResultSetFormatter.outputAsJSON(outputStream, results);

// and turn that into a String
String json = new String(outputStream.toByteArray());

System.out.println(json);