elasticsearch学习总结（三） Java API的使用范例1

一、关键词查询

/**

* es中查询日志
* @param page
* @param esAppLog
* @return
*/
public List<EsAppLog> getEsAppLogs(Page<EsAppLog> page, EsAppLog esAppLog) {

  //前端参数

  String index = esAppLog.getIndex();

  String keyword = esAppLog.getKeyWord();

   //查询的索引数组

  SearchRequestBuilder responsebuilder = client.prepareSearch(index.split(","));

  //关键词查询

  if(StringUtils.isNotEmpty(keyword)){
    responsebuilder.setQuery(QueryBuilders.matchQuery("message", keyword));
  }

  if(null != page){
    int size = page.getPageSize();
    int start = (page.getPageNo() - 1) * size;
    responsebuilder.setFrom(start).setSize(size);
  }
  //执行查询

  SearchResponse myresponse = responsebuilder.setExplain(true).get();

  SearchHits hits = myresponse.getHits(); 

  //总条数
  if(null != page){
    page.setCount(hits.getTotalHits());

  }

  //转换成对象

  List<EsAppLog> logs = new ArrayList<EsAppLog>();
  EsAppLog log = null;
  for (int i = 0; i < hits.getHits().length; i++) {  
          Map<String,Object> item = hits.getHits()[i].getSource();
          log = new EsAppLog();
          log.setIp((String)item.get("host"));
          log.setTime((String)item.get("@timestamp"));
          log.setLogName((String)item.get("path"));
          log.setLogContent((String)item.get("message"));
          
          logs.add(log);
   }
  return logs;

}

二、多条件查询并返回指定字段

public void getCPUEsData(){

  //索引值
  SearchRequestBuilder responsebuilder = client.prepareSearch("system");
  //返回指定字段
  SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
  String[] fields = {"@timestamp","value"};
  FetchSourceContext sourceContext = new FetchSourceContext(fields);
  searchSourceBuilder.fetchSource(sourceContext);
  responsebuilder.setSource(searchSourceBuilder);
  //collectd=cpu and type_instance=system条件查询
  responsebuilder.setQuery(QueryBuilders.boolQuery().must(QueryBuilders.termQuery("collectd_type", "cpu")).must(QueryBuilders.termQuery("type_instance", "system")));

  //执行查询
  SearchResponse myresponse = responsebuilder.get();
  SearchHits hits = myresponse.getHits(); 
  for (int i = 0; i < hits.getHits().length; i++) {  

    Map<String,Object> item = hits.getHits()[i].getSource();
    System.out.println(item);
  }
}