Elasticsearch Java API

Elasticsearch JAVA API大致分如下四类：

1.TransportClient

步骤1：获取client

步骤2：执行对应的增、删、改、查操作

/**
* Query Search
* @param index
* @param type
* @param term
* @param queryString
*/
private static void querySearch(String index, String type,String term,String queryString){
Client client = createTransportClient();
SearchResponse response = client.prepareSearch(index)
  .setTypes(type)
  // 设置查询类型
// 1.SearchType.DFS_QUERY_THEN_FETCH = 精确查询
// 2.SearchType.SCAN = 扫描查询,无序
// 3.SearchType.COUNT = 不设置的话,这个为默认值,还有的自己去试试吧
  .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
  // 设置查询关键词
  .setQuery(QueryBuilders.matchQuery(term, queryString))
  .addHighlightedField(term)
  .setHighlighterPreTags("<em>")
  .setHighlighterPostTags("</em>")
  // 设置查询数据的位置,分页用
.setFrom(0)
// 设置查询结果集的最大条数
.setSize(60)
// 设置是否按查询匹配度排序
.setExplain(true)
// 最后就是返回搜索响应信息
  .execute()
  .actionGet();
SearchHits searchHits = response.getHits();
System.out.println("-----------------在["+term+"]中搜索关键字["+queryString+"]---------------------");
System.out.println("共匹配到:"+searchHits.getTotalHits()+"条记录!");
SearchHit[] hits = searchHits.getHits();
for (SearchHit searchHit : hits) {
//获取高亮的字段
Map<String, HighlightField> highlightFields = searchHit.getHighlightFields();
HighlightField highlightField = highlightFields.get(term);
System.out.println("高亮字段:"+highlightField.getName()+"\n高亮部分内容:"+highlightField.getFragments()[0].string());
Map<String, Object> sourceAsMap = searchHit.sourceAsMap();
Set<String> keySet = sourceAsMap.keySet();
for (String string : keySet) {
//key value 值对应关系
System.out.println(string+":"+sourceAsMap.get(string));
}
System.out.println();
}
}

2.RestClient

ES5.0引入一个新的客户端RestClient，使用HTTP API elasticsearch代替内部协议，这需要更少依赖，也不需要关注那么多版本。

HttpEntity entity = new NStringEntity(
      "{ \"query\": { \"match_all\": {}}}",
      ContentType.APPLICATION_JSON);
  // alternative: performRequestAsync
  Response response = restClient.performRequest("POST",                                     "/_search", emptyMap(), entity);
  String json = toString(response.getEntity());
  // ...

3.Jest

Jest是ES的Java HTTP Rest客户端

/**
* @brief：全文检索入口
* @throws Exception
*/
private static void fullTextQuery(String queryString) throws Exception {
JestClient jestClient = JestExample.getJestClient();   //工厂模式实现
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.queryStringQuery(queryString));

Search search = new Search.Builder(searchSourceBuilder.toString())
// .addIndex("article")
.build();
SearchResult result = jestClient.execute(search);
System.out.println(result.getJsonString());
}

4.Spring Data Elasticsearch

...

1）、API对比：http://blog.florian-hopf.de/2016/11/java-clients-elasticsearch.html
2）、官网API地址：https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.3/index.html
3）、Jest地址：https://github.com/searchbox-io/Jest
4）、代码示例：https://github.com/ameizi/elasticsearch-jest-example

1）、API对比： http://blog.florian-hopf.de/2016/11/java-clients-elasticsearch.html
2）、官网API地址： https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.3/index.html
3）、Jest地址： https://github.com/searchbox-io/Jest
4）、代码示例： https://github.com/ameizi/elasticsearch-jest-example

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