solr 6.3 linux

import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocumentList;

public class SolrExample {
    public static void main(String[] args) throws Exception {
        String solrUrl = "http://localhost:8983/solr/core_name";
        SolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();

        SolrQuery query = new SolrQuery();
        query.setQuery("title:Solr");

        QueryResponse response = solrClient.query(query);
        SolrDocumentList documents = response.getResults();

        System.out.println("Found " + documents.getNumFound() + " documents.");
        for (int i = 0; i < documents.size(); ++i) {
            System.out.println(documents.get(i));
        }

        solrClient.close();
    }
}