将SPARQL的结果写入java中的文件

import org.apache.jena.query.*;
import org.apache.jena.rdf.model.*;
import java.io.*;

public class SparqlResultToFile {
    public static void main(String[] args) {
        // 构建SPARQL查询语句
        String sparqlQuery = "SELECT ?subject ?predicate ?object WHERE { ?subject ?predicate ?object }";

        // 创建一个文件写入器
        try (FileWriter writer = new FileWriter("sparql_results.txt")) {
            // 创建一个Query对象
            Query query = QueryFactory.create(sparqlQuery);

            // 创建一个QueryExecution对象
            try (QueryExecution qexec = QueryExecutionFactory.sparqlService("http://example.com/sparql-endpoint", query)) {
                // 执行查询并获取结果集
                ResultSet results = qexec.execSelect();

                // 遍历结果集并将结果写入文件
                while (results.hasNext()) {
                    QuerySolution soln = results.nextSolution();
                    RDFNode subject = soln.get("subject");
                    RDFNode predicate = soln.get("predicate");
                    RDFNode object = soln.get("object");

                    // 将结果写入文件
                    writer.write(subject.toString() + " " + predicate.toString() + " " + object.toString() + "\n");
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}