Elasticsearch Java REST高级客户端SearchScrollApi

迈不过友情╰ 2021-11-27 01:30 324阅读 0赞

# Elasticsearch Java REST高级客户端SearchScrollApi #

版本：Elasticsearch 7.2.0

maven配置见：[Elasticsearch Java REST高级客户端-DocumentApi][Elasticsearch Java REST_-DocumentApi]

SearchScroll和search的使用时是很相似的，只是在search上多了个滚动

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]

下面是Elasticsearch 滚动查询（或是分页查询）

public static void searchScroll() {
    		RestHighLevelClient client = getClient();
    		final Scroll scroll = new Scroll(TimeValue.timeValueMinutes(1L));
    		SearchRequest searchRequest = new SearchRequest("movies");
    		searchRequest.scroll(scroll);
    		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    		MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("title", "you life");
    		searchSourceBuilder.query(matchQueryBuilder);
    		searchRequest.source(searchSourceBuilder);
    
    		SearchResponse searchResponse = null;
    		try {
    			searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
    		} catch (IOException e) {
    			// TODO 自动生成的 catch 块
    			e.printStackTrace();
    		}
    		String scrollId = searchResponse.getScrollId();
    		SearchHit[] searchHits = searchResponse.getHits().getHits();
    		var page = 1;
    		while (searchHits != null && searchHits.length > 0) {
    
    			SearchScrollRequest scrollRequest = new SearchScrollRequest(scrollId);
    			scrollRequest.scroll(scroll);
    			try {
    				searchResponse = client.scroll(scrollRequest, RequestOptions.DEFAULT);
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    			scrollId = searchResponse.getScrollId();
    			searchHits = searchResponse.getHits().getHits();
    			if (searchHits != null && searchHits.length > 0) {
    				page++;
    				System.out.println("第"+page+"页");
    				Arrays.asList(searchHits).stream().map(h -> h.getSourceAsString()).forEach(System.out::println);
    			}
    		}
    
    		ClearScrollRequest clearScrollRequest = new ClearScrollRequest();
    		clearScrollRequest.addScrollId(scrollId);
    		ClearScrollResponse clearScrollResponse;
    		try {
    			clearScrollResponse = client.clearScroll(clearScrollRequest, RequestOptions.DEFAULT);
    			boolean succeeded = clearScrollResponse.isSucceeded();
    			System.out.println("清除滚屏是否成功:" + succeeded);
    		} catch (IOException e) {
    			// TODO 自动生成的 catch 块
    			e.printStackTrace();
    		}
    		
    		close(client);
    	}
    
    	/**
    	 * 
    	 * 关闭客户端
    	 * 
    	 * @param client
    	 */
    	private static void close(RestHighLevelClient client) {
    		try {
    			client.close();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 获取客户端
    	 * 
    	 * @return
    	 */
    	private static RestHighLevelClient getClient() {
    		RestHighLevelClient client = new RestHighLevelClient(
    				RestClient.builder(new HttpHost("elk-node01", 9200, "http"), new HttpHost("elk-node02", 9200, "http"),
    						new HttpHost("elk-node03", 9200, "http")));
    		return client;
    	}

上一篇：[Elasticsearch Java REST高级客户端SearchApi][Elasticsearch Java REST_SearchApi]

[Elasticsearch Java REST_-DocumentApi]: https://blog.csdn.net/u014646662/article/details/96473156
[Link 1]: https://www.cbedai.net/u014646662
[Elasticsearch Java REST_SearchApi]: https://blog.csdn.net/u014646662/article/details/96853830