import org.apache.solr.client.solrj.impl.CloudSolrServer;
import org.apache.solr.common.SolrInputDocument;
CloudSolrServer server = new CloudSolrServer("localhost:9983");
server.setDefaultCollection("collection1");
SolrInputDocument doc = new SolrInputDocument();
doc.addField( "id", "1234");
doc.addField( "name", "A lovely summer holiday");
server.add(doc);
server.commit();
From Solj documentation : http://wiki.apache.org/solr/Solrj