java操作solr实现查询功能的实例

 /** * solr查询方法 * @param client solr客户端 * @param query solr查询对象 * @return list集合 * @throws SolrServerException * @throws IOException */ public static List> getSolrQuery(HttpSolrClient client, SolrQuery query) throws SolrServerException, IOException{ List> list = null; //执行查询并返回结果 QueryResponse resp = client.query(query); SolrDocumentList results = resp.getResults(); //获取查询到的数据总量 long numFound = results.getNumFound(); //判断总量是否大于0， if(numFound <= 0) { //如果小于0，表示未查询到任何数据，返回null return null; }else { //如果大于0，表示有数据 //创建list存储每条数据 list = new ArrayList<>(); //遍历结果集 for (SolrDocument doc : results) { //得到每条数据的map集合 Map map = doc.getFieldValueMap(); //添加到list list.add(map); } //返回list集合 return list; } }

 public static void main(String[] args) throws SolrServerException, IOException { //创建solr客户端连接 HttpSolrClient hsc = new HttpSolrClient.Builder(SOLR_URL).build(); //创建查询对象 SolrQuery query = new SolrQuery(); //设置查询全部数据的条件 //query.setQuery("*:*"); query.setQuery("id:1"); List> list = getSolrQuery(hsc, query); if(list == null) { System.out.println("未查询到任何结果"); return; } for (Map map : list) { Iterator it = map.keySet().iterator(); while(it.hasNext()) { String key = it.next(); Object value = map.get(key); System.out.println(key+"----"+value); } System.out.println("======================================="); }