谷粒商城125、全文检索-ElasticSearch-整合-SpringBoot整合high-level-client
1.7、elasticsearch-Rest-Client
java操作es有两种方式
9300: TCP
spring-data-elasticsearch:transport-api.jar;
springboot版本不同，ransport-api.jar不同，不能适配es版本
7.x已经不建议使用，8以后就要废弃
9200: HTTP
有诸多包
jestClient: 非官方，更新慢；
RestTemplate：模拟HTTP请求，ES很多操作需要自己封装，麻烦；
HttpClient：同上；
Elasticsearch-Rest-Client：官方RestClient，封装了ES操作，API层次分明，上手简单；
最终选择Elasticsearch-Rest-Client（elasticsearch-rest-high-level-client）
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-high.html
转载自博客
https://blog.csdn.net/m0_49183244/article/details/123955156
1.8、SpringBoot整合ES
创建项目 gulimall-search
选择依赖web，但不要在里面选择es。 并做降版本处理
1.8.1、配置基本的项目
第一步、导入依赖
1.search API详情请参考添加链接描述这里的版本要和所按照的ELK版本匹配
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.atguigu.gulimall</groupId> <artifactId>gulimall-search</artifactId> <version>0.0.1-SNAPSHOT</version> <name>gulimall-search</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Hoxton.SR3</spring-cloud.version> <elasticsearch.version>7.9.2</elasticsearch.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.atguigu.gulimall</groupId> <artifactId>gulimall-common</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-high-level-client</artifactId> <version>7.9.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>默认情况下在spring-boot-dependencies中所依赖的ES版本位6.8.4，要改掉，如何去掉了
<properties> <java.version>1.8</java.version> <spring-cloud.version>Hoxton.SR3</spring-cloud.version> <elasticsearch.version>7.9.2</elasticsearch.version> </properties>
查是否去掉：查看maven依赖的库是否正确，如果没有去掉下面的依赖的包为6.8.4
第二步、编写配置，给容器中注入一个 RestHighLevelClient
编写配置，给容器中注入一个 RestHighLevelClient在 com.hgw.gulimall.search.config包下创建一个ES的配置类
请求测试项，比如es添加了安全访问规则，访问es需要添加一个安全头，就可以通过requestOptions设置
官方建议把requestOptions创建成单实例
@Configuration public class GulimallElasticSearchConfig { public static final RequestOptions COMMON_OPTIONS; static { RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder(); COMMON_OPTIONS = builder.build(); } @Bean public RestHighLevelClient esRestClient() { RestClientBuilder builder = null; // 可以指定多个es builder = RestClient.builder(new HttpHost("124.222.223.222",9200,"http")); RestHighLevelClient client = new RestHighLevelClient(builder); return client; } }我们的es集群使用了用户名和密码
package com.atguigu.gulimall.search; import org.apache.http.HttpHost; import org.apache.http.auth.AuthScope; import org.apache.http.auth.UsernamePasswordCredentials; import org.apache.http.client.CredentialsProvider; import org.apache.http.client.config.RequestConfig; import org.apache.http.impl.client.BasicCredentialsProvider; import org.apache.http.impl.nio.client.HttpAsyncClientBuilder; import org.elasticsearch.client.*; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; /** * 1、导入依赖 * 2、编写配置，给容器中注入一个RestHighLevelClient * 3、参照API https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.4/index.html */ @Configuration public class GulimallElasticSearchConfig { private String hosts; public static final RequestOptions COMMON_OPTIONS; static { RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder(); // builder.addHeader("Authorization", "Bearer " + TOKEN); // builder.setHttpAsyncResponseConsumerFactory( // new HttpAsyncResponseConsumerFactory // .HeapBufferedResponseConsumerFactory(30 * 1024 * 1024 * 1024)); COMMON_OPTIONS = builder.build(); } @Bean public RestHighLevelClient esRestClient() { final CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("elastic", "123456")); RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.175.144", 9200)) .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() { @Override public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) { return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider); } }); RestHighLevelClient client = new RestHighLevelClient(builder); return client; } }1.8.2、具体的Api测试
1.8.2.1、创建索引
package com.atguigu.gulimall.search; import lombok.ToString; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.action.search.SearchRequest; import org.elasticsearch.action.search.SearchResponse; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.common.unit.TimeValue; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.search.SearchHit; import org.elasticsearch.search.SearchHits; import org.elasticsearch.search.aggregations.AggregationBuilders; import org.elasticsearch.search.aggregations.Aggregations; import org.elasticsearch.search.aggregations.bucket.terms.Terms; import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder; import org.elasticsearch.search.aggregations.metrics.Avg; import org.elasticsearch.search.aggregations.metrics.AvgAggregationBuilder; import org.elasticsearch.search.builder.SearchSourceBuilder; import org.junit.runner.RunWith; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import com.alibaba.fastjson.JSON; import lombok.Data; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.common.xcontent.XContentType; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import javax.annotation.Resource; import java.io.IOException; import java.util.concurrent.TimeUnit; @SpringBootTest @RunWith(SpringRunner.class) public class GulimallSearchApplicationTests { @Resource private RestHighLevelClient client; /** * 测试存储数据到es */ @Test public void indexData() throws IOException { IndexRequest indexRequest = new IndexRequest("users");//向users下存数据 indexRequest.id("1");//不设会自动生成 // indexRequest.source("userName", "zhangsan","age", 18,"gender", "男");//数据内容形式，k-v形式 User user= new User(); user.setUserName("zhangsan"); user.setAge(18); user.setGender("男"); String jsonString = JSON.toJSONString(user); indexRequest.source(jsonString, XContentType.JSON);//数据内容形式，json形式 //执行操作。索引数据不存在数据就生成，存在就更新 IndexResponse index = client.index(indexRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); System.out.println(index); } @Data static class User{ private String userName; private Integer age; private String gender; } /** * 复杂检索:在bank中搜索address中包含mill的所有人的年龄分布以及平均年龄，平均薪资 * @throws IOException */ @Test public void searchData() throws IOException { //1. 创建检索请求 SearchRequest searchRequest = new SearchRequest(); //1.1）指定索引 searchRequest.indices("bank"); //1.2）构造检索条件 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(QueryBuilders.matchQuery("address","Mill")); //1.2.1)按照年龄分布进行聚合 TermsAggregationBuilder ageAgg= AggregationBuilders.terms("ageAgg").field("age").size(10); sourceBuilder.aggregation(ageAgg); //1.2.2)计算平均年龄 AvgAggregationBuilder ageAvg = AggregationBuilders.avg("ageAvg").field("age"); sourceBuilder.aggregation(ageAvg); //1.2.3)计算平均薪资 AvgAggregationBuilder balanceAvg = AggregationBuilders.avg("balanceAvg").field("balance"); sourceBuilder.aggregation(balanceAvg); System.out.println("检索条件："+sourceBuilder); searchRequest.source(sourceBuilder); //2. 执行检索 SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); System.out.println("检索结果："+searchResponse); //3. 将检索结果封装为Bean SearchHits hits = searchResponse.getHits(); SearchHit[] searchHits = hits.getHits(); for (SearchHit searchHit : searchHits) { String sourceAsString = searchHit.getSourceAsString(); Account account = JSON.parseObject(sourceAsString, Account.class); System.out.println(account); } //4. 获取聚合信息 Aggregations aggregations = searchResponse.getAggregations(); Terms ageAgg1 = aggregations.get("ageAgg"); for (Terms.Bucket bucket : ageAgg1.getBuckets()) { String keyAsString = bucket.getKeyAsString(); System.out.println("年龄："+keyAsString+" ==> "+bucket.getDocCount()); } Avg ageAvg1 = aggregations.get("ageAvg"); System.out.println("平均年龄："+ageAvg1.getValue()); Avg balanceAvg1 = aggregations.get("balanceAvg"); System.out.println("平均薪资："+balanceAvg1.getValue()); } /** * SearchRequest 搜索请求 * SearchSourceBuilder 条件构造 * HighlightBuilder 构建高亮 * TermQueryBuilder 精确查询 * MatchAllQueryBuilder 匹配所有 * XXXQueryBuilder 对应所有命令 */ @Test public void testSearch() throws IOException { // 1、创建检索的请求 SearchRequest searchRequest = new SearchRequest("bank"); // 2、封装检索的构建 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); // 2.1）构件检索条件 sourceBuilder.query(QueryBuilders.matchQuery("address","mill")); sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); // 3、构建放到请求里面 searchRequest.source(sourceBuilder); // 4、执行请求 SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); System.out.println(JSON.toJSON(searchResponse.getHits())); System.out.println("====================="); for (SearchHit hit : searchResponse.getHits().getHits()) { System.out.println(hit.getSourceAsMap()); } } @ToString @Data static class Account { private int account_number; private int balance; private String firstname; private String lastname; private int age; private String gender; private String address; private String employer; private String email; private String city; private String state; } }// 测试索引的创建 Request @Test public void testCreateIndex() throws IOException { // 1、创建索引请求 CreateIndexRequest request = new CreateIndexRequest("hgw_index"); // 2、执行创建请求 IndicesClient，请求后获得响应 CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT); System.out.println(createIndexResponse); }
1.8.2.2、获取索引（判断索引是否存在）
获取索引
// 测试获取索引 @Test public void testGetIndex() throws IOException { GetIndexRequest request = new GetIndexRequest("hgw_index"); boolean exists = client.indices().exists(request, RequestOptions.DEFAULT); System.out.println(exists); }1.8.2.3、删除索引
删除索引
// 测试删除索引 @Test public void testDeleteIndex() throws IOException { DeleteIndexRequest request = new DeleteIndexRequest("hgw_index"); AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT); System.out.println(delete.isAcknowledged()); }1.8.2.4、CRUD文档
1.8.2.4.1、增加
@Test public void testAddDocument() throws IOException { // 创建请求体内容 User user = new User(); user.setName("hgw"); user.setGender("男"); user.setAge(21); String UserJson = JSON.toJSONString(user); // 创建请求 IndexRequest request = new IndexRequest("hgw_index"); // 规则 PUT /hgw_index/_doc/1 request.id("1"); request.timeout(TimeValue.timeValueSeconds(1)); request.timeout("1s"); // 将我们的数据放入请求JSON, 并且指定泛指的类型 request.source(UserJson, XContentType.JSON); // 客户端发送请求，获取响应的结果 IndexResponse indexResponse = client.index(request, GulimallElasticSearchConfig.COMMON_OPTIONS); System.out.println(indexResponse.toString()); System.out.println(indexResponse.status()); // 对应我们命令返回的状态 CREATED }IndexResponse[index=hgw_index,type=_doc,id=1,version=1,result=created,seqNo=0,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]
批量增加
————————————————@Test public void testBulkRequest() throws IOException { BulkRequest bulkRequest = new BulkRequest(); bulkRequest.timeout("10s"); ArrayList<User> userList = new ArrayList<>(); userList.add(new User("hwg1", "男", 18)); userList.add(new User("hwg2", "男", 19)); userList.add(new User("hwg3", "男", 20)); userList.add(new User("hwg4", "男", 21)); userList.add(new User("hly5", "女", 22)); // 批处理请求 for (int i = 0; i < userList.size(); i++) { bulkRequest.add(new IndexRequest("hgw_index") .id(""+(i+1)) .source(JSON.toJSONString(userList.get(i)), XContentType.JSON) ); } BulkResponse bulk = client.bulk(bulkRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); System.out.println(bulk.hasFailures()); // 是否失败，返回false表示成功 }1.8.2.4.2、查找
获取文档的信息
// 获取文档的信息 @Test public void testGetDocument() throws IOException { GetRequest getRequest = new GetRequest("hgw_index","1"); GetResponse getResponse = client.get(getRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); System.out.println(getResponse.getSourceAsString()); // 打印文档的内容 System.out.println(getResponse); // 返回的全部内容和命令是一样的 }获取文档 (判断是否存在)
// 获取文档，判断是否存在 get /index/doc/1 @Test public void testIsExists() throws IOException { GetRequest getRequest = new GetRequest("hgw_index", "1"); // 不获取返回的 _source 的上下文了 getRequest.fetchSourceContext(new FetchSourceContext(false)); getRequest.storedFields("_none_"); boolean exists = client.exists(getRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); System.out.println(exists); }1.8.2.4.3、修改
更新文档的信息
// 更新文档的信息 @Test public void testUpdateDocument() throws IOException { UpdateRequest updateRequest = new UpdateRequest("hgw_index","1"); updateRequest.timeout("1s"); User user = new User("黄龚伟", "男",50); updateRequest.doc(JSON.toJSONString(user),XContentType.JSON); UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT); System.out.println(updateResponse.status()); }1.8.2.4.4、删除
删除文档记录
// 删除文档的纪律 @Test public void testDeleteRequest() throws IOException { DeleteRequest deleteRequest = new DeleteRequest("hgw_index","1"); deleteRequest.timeout("1s"); DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT); System.out.println(deleteResponse.status()); }1.8.2.5.1、普通检索
普通检索
/** * SearchRequest 搜索请求 * SearchSourceBuilder 条件构造 * HighlightBuilder 构建高亮 * TermQueryBuilder 精确查询 * MatchAllQueryBuilder 匹配所有 * XXXQueryBuilder 对应所有命令 */ @Test public void testSearch() throws IOException { // 1、创建检索的请求 SearchRequest searchRequest = new SearchRequest("bank"); // 2、封装检索的构建 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); // 2.1）构件检索条件 sourceBuilder.query(QueryBuilders.matchQuery("address","mill")); sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); // 3、构建放到请求里面 searchRequest.source(sourceBuilder); // 4、执行请求 SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); System.out.println(JSON.toJSON(searchResponse.getHits())); System.out.println("====================="); for (SearchHit hit : searchResponse.getHits().getHits()) { System.out.println(hit.getSourceAsMap()); } }1.8.2.5.2、复杂检索
搜索address中包含mill的所有人的年龄分布，平均薪资
@Test public void searchData() throws IOException { // 1、创建检索请求 SearchRequest searchRequest = new SearchRequest(); // 指定索引 searchRequest.indices("bank"); // 指定DSL,索引条件 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); // 1.1）构件检索条件 searchSourceBuilder.query(QueryBuilders.matchQuery("address", "mill")); // 按照年年龄的值分布进行聚合 TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10); searchSourceBuilder.aggregation(ageAgg); // 计算平均薪资进行聚合 AvgAggregationBuilder balanceAvg = AggregationBuilders.avg("balanceAvg").field("balance"); searchSourceBuilder.aggregation(balanceAvg); searchRequest.source(searchSourceBuilder); // 2、执行检索 SearchResponse searchResponse = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS); // 3、分析结果 System.out.println(searchResponse.toString());
博客2：
https://blog.csdn.net/qq_41596346/article/details/121989068
https://blog.csdn.net/qq_41596346/article/details/121989068
2.查询条件
@Testpublic void searchData() throws IOException { //1. 创建检索请求 SearchRequest searchRequest = new SearchRequest();
//1.1）指定索引 searchRequest.indices("bank"); //1.2）构造检索条件 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(QueryBuilders.matchQuery("address", "Mill"));
System.out.println("检索条件: " + sourceBuilder); searchRequest.source(sourceBuilder); //2. 执行检索 SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); System.out.println("检索结果: " + searchResponse);}123456789101112131415161718结果:
检索条件: {"query":{"match":{"address":{"query":"Mill","operator":"OR","prefix_length":0,"max_expansions":50,"fuzzy_transpositions":true,"lenient":false,"zero_terms_query":"NONE","auto_generate_synonyms_phrase_query":true,"boost":1.0}}}}
检索结果: {"took":6,"timed_out":false,"_shards":{"total":1,"successful":1,"skipped":0,"failed":0},"hits":{"total":{"value":4,"relation":"eq"},"max_score":5.4032025,"hits":[{"_index":"bank","_type":"account","_id":"970","_score":5.4032025,"_source":{"account_number":970,"balance":19648,"firstname":"Forbes","lastname":"Wallace","age":28,"gender":"M","address":"990 Mill Road","employer":"Pheast","email":"forbeswallace@pheast.com","city":"Lopezo","state":"AK"}},{"_index":"bank","_type":"account","_id":"136","_score":5.4032025,"_source":{"account_number":136,"balance":45801,"firstname":"Winnie","lastname":"Holland","age":38,"gender":"M","address":"198 Mill Lane","employer":"Neteria","email":"winnieholland@neteria.com","city":"Urie","state":"IL"}},{"_index":"bank","_type":"account","_id":"345","_score":5.4032025,"_source":{"account_number":345,"balance":9812,"firstname":"Parker","lastname":"Hines","age":38,"gender":"M","address":"715 Mill Avenue","employer":"Baluba","email":"parkerhines@baluba.com","city":"Blackgum","state":"KY"}},{"_index":"bank","_type":"account","_id":"472","_score":5.4032025,"_source":{"account_number":472,"balance":25571,"firstname":"Lee","lastname":"Long","age":32,"gender":"F","address":"288 Mill Street","employer":"Comverges","email":"leelong@comverges.com","city":"Movico","state":"MT"}}]}}12343.聚合条件
在测试类中添加静态内部类
@ToString@Datastatic class Account { private int account_number; private int balance; private String firstname; private String lastname; private int age; private String gender; private String address; private String employer; private String email; private String city; private String state;}123456789101112131415测试方法
@Testpublic void searchData() throws IOException { //1. 创建检索请求 SearchRequest searchRequest = new SearchRequest();
//1.1）指定索引 searchRequest.indices("bank"); //1.2）构造检索条件 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(QueryBuilders.matchQuery("address", "Mill"));
//1.2.1)按照年龄分布进行聚合 TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10); sourceBuilder.aggregation(ageAgg);
//1.2.2)计算平均年龄 AvgAggregationBuilder ageAvg = AggregationBuilders.avg("ageAvg").field("age"); sourceBuilder.aggregation(ageAvg);
//1.2.3)计算平均薪资 AvgAggregationBuilder balanceAvg = AggregationBuilders.avg("balanceAvg").field("balance"); sourceBuilder.aggregation(balanceAvg);
System.out.println("检索条件: " + sourceBuilder); searchRequest.source(sourceBuilder); System.out.println();
//2. 执行检索 SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); System.out.println("检索结果: " + searchResponse); System.out.println();
//3. 将检索结果封装为Bean SearchHits hits = searchResponse.getHits(); SearchHit[] searchHits = hits.getHits(); for (SearchHit searchHit : searchHits) { String sourceAsString = searchHit.getSourceAsString(); Account account = JSON.parseObject(sourceAsString, Account.class); System.out.println(account); } }123456789101112131415161718192021222324252627282930313233343536373839404142结果如下:
在线JSON格式化后与我们在kibana中是一致的
4.分析结果
/** * 复杂检索:在bank中搜索address中包含mill的所有人的年龄分布以及平均年龄，平均薪资 * @throws IOException */ @Test public void searchData() throws IOException { //1. 创建检索请求 SearchRequest searchRequest = new SearchRequest();
//1.1）指定索引 searchRequest.indices("bank"); //1.2）构造检索条件 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); sourceBuilder.query(QueryBuilders.matchQuery("address", "Mill"));
//1.2.1)按照年龄分布进行聚合 TermsAggregationBuilder ageAgg = AggregationBuilders.terms("ageAgg").field("age").size(10); sourceBuilder.aggregation(ageAgg);
//1.2.2)计算平均年龄 AvgAggregationBuilder ageAvg = AggregationBuilders.avg("ageAvg").field("age"); sourceBuilder.aggregation(ageAvg);
//1.2.3)计算平均薪资 AvgAggregationBuilder balanceAvg = AggregationBuilders.avg("balanceAvg").field("balance"); sourceBuilder.aggregation(balanceAvg);
System.out.println("检索条件: " + sourceBuilder); searchRequest.source(sourceBuilder); System.out.println();
//2. 执行检索 SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); System.out.println("检索结果: " + searchResponse); System.out.println();
//3. 将检索结果封装为Bean SearchHits hits = searchResponse.getHits(); SearchHit[] searchHits = hits.getHits(); for (SearchHit searchHit : searchHits) { String sourceAsString = searchHit.getSourceAsString(); Account account = JSON.parseObject(sourceAsString, Account.class); System.out.println(account); } System.out.println();
//4. 获取聚合信息 Aggregations aggregations = searchResponse.getAggregations(); Terms ageAgg1 = aggregations.get("ageAgg"); for (Terms.Bucket bucket : ageAgg1.getBuckets()) { String keyAsString = bucket.getKeyAsString(); System.out.println("年龄: " + keyAsString + " ==> " + bucket.getDocCount()); } Avg ageAvg1 = aggregations.get("ageAvg"); System.out.println("平均年龄: " + ageAvg1.getValue()); System.out.println();
Avg balanceAvg1 = aggregations.get("balanceAvg"); System.out.println("平均薪资: " + balanceAvg1.getValue()); }1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
————————————————版权声明：本文为CSDN博主「Java小生不才」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。原文链接：https://blog.csdn.net/qq_41596346/article/details/121989068
posted on 2022-07-19 16:57 luzhouxiaoshuai 阅读(270) 评论(0) 编辑 收藏 举报
