環(huán)境：springboot2.4.12 + elasticsearch7.8.004H28資訊網(wǎng)——每日最新資訊28at.com

      Elasticsearch是一種開(kāi)源的、分布式的、實(shí)時(shí)的搜索和分析引擎。它允許你存儲(chǔ)，搜索和分析大量數(shù)據(jù)，通常用于為網(wǎng)站或應(yīng)用程序提供強(qiáng)大的搜索功能。04H28資訊網(wǎng)——每日最新資訊28at.com

      Java API是Elasticsearch提供的官方客戶端，它允許Java開(kāi)發(fā)者輕松地與Elasticsearch服務(wù)器進(jìn)行交互。下面是一些關(guān)于如何使用Java API來(lái)調(diào)用Elasticsearch的常用方法。04H28資訊網(wǎng)——每日最新資訊28at.com

注意：這里為了方便使用springboot項(xiàng)目（避免還要單獨(dú)引用其它包）04H28資訊網(wǎng)——每日最新資訊28at.com

相關(guān)依賴

<dependency>  <groupId>org.springframework.boot</groupId>  <artifactId>spring-boot-starter-web</artifactId></dependency><dependency>  <groupId>org.elasticsearch</groupId>  <artifactId>elasticsearch</artifactId>  <version>7.8.0</version><!--$NO-MVN-MAN-VER$--></dependency><dependency>  <groupId>org.elasticsearch.client</groupId>  <artifactId>elasticsearch-rest-high-level-client</artifactId>  <version>7.8.0</version><!--$NO-MVN-MAN-VER$--></dependency>

索引操作

高級(jí)別的Rest客戶端對(duì)象04H28資訊網(wǎng)——每日最新資訊28at.com

private static RestHighLevelClient client =   new RestHighLevelClient(RestClient.builder(    new HttpHost("localhost", 9200, "http"))) ;

1. 創(chuàng)建索引

public static void createIndex(String index) throws Exception {  CreateIndexRequest request = new CreateIndexRequest(index) ;  CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT) ;  boolean ack = response.isAcknowledged() ;  System.out.println("ack = " + ack) ;}

2. 查看索引

public static void viewIndex(String index) throws Exception {  GetIndexRequest request = new GetIndexRequest(index) ;  GetIndexResponse response = client.indices().get(request, RequestOptions.DEFAULT) ;  System.out.println("aliases: " + response.getAliases() + "/n"    + "mappings: " + response.getMappings() + "/n"    + "settings: " + response.getSettings()) ;}

3. 刪除索引

public static void deleteIndex(String index) throws Exception {  DeleteIndexRequest request = new DeleteIndexRequest(index) ;  AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT) ;  System.out.println("ack: " + response.isAcknowledged()) ;}

文檔操作

private static RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("localhost", 9200, "http"))) ;

1. 創(chuàng)建文檔

public static void createDoc(String index, Users users) throws Exception {  IndexRequest request = new IndexRequest() ;  // 設(shè)置索引及唯一標(biāo)識(shí)  request.index(index).id("1001") ;  ObjectMapper objectMapper = new ObjectMapper() ;  String jsonString = objectMapper.writeValueAsString(users) ;  // 添加文檔數(shù)據(jù)及數(shù)據(jù)格式  request.source(jsonString, XContentType.JSON) ;  IndexResponse response = client.index(request, RequestOptions.DEFAULT) ;  System.out.println("_index: " + response.getIndex() + "/n"      + "_id: " + response.getId() + "/n"      + "_result: " + response.getResult()) ;}

2. 更新文檔

public static void updateDoc(String index, String id) throws Exception {  UpdateRequest request = new UpdateRequest() ;  // 配置修改參數(shù)  request.index(index).id(id) ;  Map<String, Object> source = new HashMap<>() ;  source.put("sex", "女") ;  request.doc(source, XContentType.JSON) ;  UpdateResponse response = client.update(request, RequestOptions.DEFAULT) ;  System.out.println("_index: " + response.getIndex() + "/n"      + "_id: " + response.getId() + "/n"      + "_result: " + response.getResult()) ;}

3. 查詢文檔

public static void viewDoc(String index, String id) throws Exception {  GetRequest request = new GetRequest().index(index).id(id) ;  GetResponse response = client.get(request, RequestOptions.DEFAULT) ;  System.out.println("_index: " + response.getIndex() + "/n"      + "_type: " + response.getType() + "/n"      + "_id: " + response.getId() + "/n"      + "source: " + response.getSourceAsString()) ;}

4. 刪除文檔

public static void deleteIndex(String index, String id) throws Exception {  DeleteRequest request = new DeleteRequest().index(index).id(id) ;  DeleteResponse response = client.delete(request, RequestOptions.DEFAULT) ;  System.out.println(response.toString()) ;}

5. 批量操作

public static void batchOperator(String index) throws Exception {  BulkRequest request = new BulkRequest() ;  request.add(new IndexRequest().index(index).id("1002").source(XContentType.JSON, "name","老六", "sex", "男", "age", 20)) ;  request.add(new IndexRequest().index(index).id("1003").source(XContentType.JSON, "name","外網(wǎng)", "sex", "女", "age", 10)) ;  request.add(new IndexRequest().index(index).id("1004").source(XContentType.JSON, "name","莉莉", "sex", "女", "age", 35)) ;  BulkResponse response = client.bulk(request, RequestOptions.DEFAULT) ;  System.out.println("took: " + response.getTook() + "/n"      + "items: " + new ObjectMapper().writeValueAsString(response.getItems())) ;}

6. 高級(jí)查詢

public static void highSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchAllQuery()) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

7. term精確查詢

public static void highTermSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.termQuery("age", "20")) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

8. 分頁(yè)查詢

public static void highPagingSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchAllQuery()) ;  builder.from(1) ;  builder.size(2) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

9. 分頁(yè)&排序查詢

public static void highPagingAndSortSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchAllQuery()) ;  builder.from(0) ;  builder.size(20) ;  builder.sort("age", SortOrder.ASC) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

10. 分頁(yè)&排序&過(guò)濾字段查詢

public static void highPagingAndSortAndFilterFieldSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchAllQuery()) ;  builder.from(0) ;  builder.size(20) ;  builder.sort("age", SortOrder.ASC) ;  String[] includes = {"name"} ;  String[] excludes = {} ;  builder.fetchSource(includes, excludes) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

11. 范圍查詢

public static void highBoolSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchAllQuery()) ;  builder.from(0) ;  builder.size(20) ;  builder.sort("age", SortOrder.ASC) ;  RangeQueryBuilder rangeBuilder = QueryBuilders.rangeQuery("age");  rangeBuilder.gte(15) ;  rangeBuilder.lte(30) ;  builder.query(rangeBuilder) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }}

12. 高亮查詢

public static void highHighLightSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.query(QueryBuilders.matchQuery("name", "莉莉")) ;  HighlightBuilder highLightBuilder = new HighlightBuilder() ;  highLightBuilder.preTags("<font color='red'>") ;  highLightBuilder.postTags("</font>") ;  highLightBuilder.field("name") ;  builder.highlighter(highLightBuilder) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString() + "/n"        + "highlight: " + hit.getHighlightFields()) ;  }}

13. 聚合查詢

public static void highAggsSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.aggregation(AggregationBuilders.avg("avg_age").field("age")) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString())  ;  }  System.out.println(((ParsedAvg)response.getAggregations().iterator().next()).getValue()) ;}

14. 分組統(tǒng)計(jì)

public static void highGroupSearch(String index) throws Exception {  SearchRequest request = new SearchRequest().indices(index) ;  SearchSourceBuilder builder = new SearchSourceBuilder() ;  builder.aggregation(AggregationBuilders.terms("age_groupby").field("age")) ;  request.source(builder) ;  SearchResponse response = client.search(request, RequestOptions.DEFAULT) ;  SearchHits hits = response.getHits() ;  System.out.println("took: " + response.getTook() + "/n"      + "timeout: " + response.isTimedOut() + "/n"      + "total: " + hits.getTotalHits() + "/n"      + "MaxScore: " + hits.getMaxScore()) ;  for (SearchHit hit : hits) {    System.out.println(hit.getSourceAsString()) ;  }  System.out.println(response) ;}

完畢?。?！04H28資訊網(wǎng)——每日最新資訊28at.com

本文鏈接：http://www.tebozhan.com/showinfo-26-12707-0.htmlElasticSearch Java API只需十招，輕松掌握變專家！

聲明：本網(wǎng)頁(yè)內(nèi)容旨在傳播知識(shí)，若有侵權(quán)等問(wèn)題請(qǐng)及時(shí)與本網(wǎng)聯(lián)系，我們將在第一時(shí)間刪除處理。郵件：2376512515@qq.com

上一篇： 十個(gè)優(yōu)秀的編程范式，你已經(jīng)用過(guò)了幾個(gè)？

下一篇： Java String類為什么用final修飾