Solrj常用操作

• 初始化連接：

  HttpSolrServer server = new HttpSolrServer("http://{ip}:{port}/{collection}");
  server.setSoTimeout(3000);
  server.setConnectionTimeout(3000);

• Insert/Update：

  SolrInputDocument insert = new SolrInputDocument();
  insert.addField("name", "jzp");
  server.add(insert);
  server.commit(true, true);

• Delete：

  // deleteByQuery
  server.deleteByQuery("name:jzp");
  server.commit(true, true);
  
  // deleteById
  server.deleteById("jzp");
  server.commit(true, true);

• Query：

  SolrQuery query = new SolrQuery();
  query.addField("*");
  query.setQuery("name:jzp");
  QueryResponse response = server.query(query);
  // 查詢返回list
  SolrDocumentList sdl = response.getResults();
  // 查詢返回count
  long count = response.getResults().getNumFound();

• Aggregate：

  SolrQuery query = new SolrQuery();
  // 統計字段
  String[] fields = {"name"};
  Map<String, Long> map = Maps.newHashMap();
  // 利用StatsComponent實現數據庫的聚合統計查詢，也就是min、max、avg、count、sum的功能
  // 是否開啓stats（true/false）
  query.set("stats", true);
  // 添加統計字段，可以有多個
  query.set("stats.field", fields);
  // 執行查詢
  QueryResponse response = server.query(query);
  // 獲取執行結果
  Map<String, FieldStatsInfo> fieldStatsInfoMap = response.getFieldStatsInfo();
  // stats.field字段設置成什麼，這裏就獲取什麼
  FieldStatsInfo fieldStatsInfo;
  Long result;
  for (String field : fields) {
      fieldStatsInfo = fieldStatsInfoMap.get(field);
      // sum
      result = Double.valueOf(fieldStatsInfo.getSum().toString()).longValue();
      // max
      result = Double.valueOf(fieldStatsInfo.getMax().toString()).longValue();
      // min
      result = Double.valueOf(fieldStatsInfo.getMin().toString()).longValue();
      // mean
      result = Double.valueOf(fieldStatsInfo.getMean().toString()).longValue();
      map.put(field, result);
  }

• Group：

  SolrQuery query = new SolrQuery();
  Map<String, Long> result = Maps.newHashMap();
  query.setParam(GroupParams.GROUP, true);
  query.setParam(GroupParams.GROUP_FIELD, "name");
  query.setParam(GroupParams.GROUP_LIMIT, "0");
  
  QueryResponse response = server.query(query);
  
  GroupResponse groupResponse;
  List<GroupCommand> groupList;
  List<Group> groups;
  if (response != null) {
      groupResponse = response.getGroupResponse();
      if (groupResponse != null) {
          groupList = groupResponse.getValues();
          for (GroupCommand groupCommand : groupList) {
              groups = groupCommand.getValues();
              for (Group group : groups) {
                  result.put(group.getGroupValue(), group.getResult().getNumFound());
              }
          }
      }
  }