ElasticSearch在Java中实现term查询

╰半夏微凉° 2022-02-16 02:44 434阅读 0赞

# ElasticSearch在Java中实现term查询 #

适用范围ElasticSearch6.x

如果是ElasticSearch7或以上版本情转到如下链接

REST高级客户端-DocumentApi：[https://blog.csdn.net/u014646662/article/details/96473156][https_blog.csdn.net_u014646662_article_details_96473156]

REST高级客户端SearchApi：[https://blog.csdn.net/u014646662/article/details/96853830][https_blog.csdn.net_u014646662_article_details_96853830]

更多新的查询方式（ElasticSearch相关文档）：[https://blog.csdn.net/u014646662/article/category/8747782][https_blog.csdn.net_u014646662_article_category_8747782]

对人工智能感兴趣的同学，可以点击以下链接：

[现在人工智能非常火爆，很多朋友都想学，但是一般的教程都是为博硕生准备的，太难看懂了。最近发现了一个非常适合小白入门的教程，不仅通俗易懂而且还很风趣幽默。所以忍不住分享一下给大家。点这里可以跳转到教程。][Link 1]

[https://www.cbedai.net/u014646662][Link 1]

term query会去倒排索引中寻找确切的term，它并不知道分词器的存在。这种查询适合keyword 、numeric、date。

*  term:查询某个字段里含有某个关键词的文档
 *  terms:查询某个字段里含有多个关键词的文档

/**
    	 * term查询
    	 */
    	@Test
    	public void term() throws Exception {
    		Settings settings = Settings.builder().put("cluster.name","my-application").build();
    		@SuppressWarnings("resource")
    		TransportClient client = new PreBuiltTransportClient(settings)
    				.addTransportAddress(new TransportAddress(InetAddress.getByName("master"),9300));
    		//about字段中包含money
    		QueryBuilder term = QueryBuilders.termQuery("about", "money");
    		//about字段中包含money或cheapest
    		QueryBuilder terms = QueryBuilders.termsQuery("about", "friend","cheapest");
    		System.out.println("match查询");
    		matchQuery(term, client);
    		System.out.println("matchAll查询");
    		matchQuery(terms, client);
    		
    	}
    
    	public void matchQuery(QueryBuilder query,TransportClient client) throws Exception {
    		SearchResponse response = client.prepareSearch("lib").setQuery(query).get();
    		for(SearchHit hit:response.getHits()) {
    			Map<String, Object> map = hit.getSourceAsMap();
    			for(String key:map.keySet()) {
    				System.out.println(key+"="+map.get(key));
    			}
    		}
    	}

[https_blog.csdn.net_u014646662_article_details_96473156]: https://blog.csdn.net/u014646662/article/details/96473156
[https_blog.csdn.net_u014646662_article_details_96853830]: https://blog.csdn.net/u014646662/article/details/96853830
[https_blog.csdn.net_u014646662_article_category_8747782]: https://blog.csdn.net/u014646662/article/category/8747782
[Link 1]: https://www.cbedai.net/u014646662