ElasticSearch入门-HelloWorld版CRUD，Http Rest访问,elasticsearch，elasticsearch-rest-high-level-client

接着上1篇

ES,SpringData,SpringBoot,一些小坑和阶段性总结

https://blog.csdn.net/FansUnion/article/details/102799101

一、概述

1、放弃SpringBoot版本，自动引入

各种问题，也没看出啥优势。

2、放弃SpringData，ES封装

CrudRepository之类的封装，不是ES未来的方向了。

全面拥抱http Rest

3、ES

7.2.0版本，2019比较新的版本。一下子跟上时代。

jar版本和ES版本，尽可能匹配，避免不必要的问题。

二、Maven配置

<!-- https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch -->         <dependency>             <groupId>org.elasticsearch</groupId>             <artifactId>elasticsearch</artifactId>             <version>7.2.0</version>         </dependency>         <dependency>             <groupId>org.elasticsearch.client</groupId>             <artifactId>elasticsearch-rest-high-level-client</artifactId>             <version>7.2.0</version>         </dependency>

三、CRUD示例

import java.io.IOException; import java.util.List; import org.apache.commons.lang.StringUtils; import org.apache.http.HttpHost; import org.elasticsearch.action.bulk.BulkRequest; import org.elasticsearch.action.bulk.BulkResponse; import org.elasticsearch.action.delete.DeleteRequest; import org.elasticsearch.action.delete.DeleteResponse; import org.elasticsearch.action.get.GetRequest; import org.elasticsearch.action.get.GetResponse; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.action.search.SearchRequest; import org.elasticsearch.action.search.SearchResponse; import org.elasticsearch.client.Node; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestClientBuilder; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.client.indices.CreateIndexRequest; import org.elasticsearch.common.xcontent.XContentType; import org.elasticsearch.index.query.QueryBuilders; import org.elasticsearch.search.SearchHit; import org.elasticsearch.search.SearchHits; import org.elasticsearch.search.builder.SearchSourceBuilder; import com.alibaba.fastjson.JSONObject; import com.google.common.collect.Lists; import lombok.extern.slf4j.Slf4j; @Slf4j public class EsKit {     public static void main(String[] args) {         //实体类         EsUser esUser =new EsUser();         int id = 1;         esUser.setId(id);         esUser.setName("fansunion");         EsUser esUser2 =new EsUser();         int id2 = 2;         esUser2.setId(id2);         esUser2.setName("sugar");         //新增         //Invalid index name [esUser], must be lowercase         String indexName="demo_esuser";         EsKit.add(indexName, esUser);         EsKit.add(indexName, esUser2);         //查询         EsUser getUser=EsKit.get(indexName, id,EsUser.class);         log.info("getUser={}",getUser);         List<EsUser> userList=EsKit.search(indexName,"fansunion", EsUser.class);         log.info("userList={}",userList);         //删除         EsKit.delete(indexName, id);         //删除之后，应该为null         EsUser getUserAfterDelete=EsKit.get(indexName, id,EsUser.class);         log.info("删除之后，应该为null:{}",getUserAfterDelete);     }           //TODO 封装常用和通用的查询     public static <T> List<T> search(String indexName,String name,Class<T> clazz){         SearchRequest searchRequest = new SearchRequest(indexName);         SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();         //termQuery是相同比较         sourceBuilder.query(QueryBuilders.termQuery("name", name));         sourceBuilder.from(0);         sourceBuilder.size(10);         //将请求体加入到请求中         searchRequest.source(sourceBuilder);         List<T> list = Lists.newArrayList();         try {             SearchResponse searchResponse = getClient().search(searchRequest, RequestOptions.DEFAULT);             SearchHits hits = searchResponse.getHits();             SearchHit[] searchHits = hits.getHits();             for (SearchHit hit : searchHits) {                 String jsonStr = hit.getSourceAsString();                 log.info("search -> " + jsonStr);                 list.add(JSONObject.parseObject(jsonStr,clazz));             }         } catch (IOException e) {             e.printStackTrace();         }         return list;     }                 public static <T> T get(String indexName, Integer id,Class<T> clazz) {         T model=null;         try {             GetRequest getRequest = new GetRequest(indexName, id+"");             RequestOptions options = RequestOptions.DEFAULT;             GetResponse getResponse = getClient().get(getRequest, options);             log.info("elastic 查询成功,getResponse={}", getResponse);             String jsonStr= getResponse.getSourceAsString();             if(StringUtils.isNotEmpty(jsonStr)){                 model =  JSONObject.parseObject(jsonStr,clazz);             }         } catch (Exception e) {             e.printStackTrace();         }         return model;     }     //add已经足够了，还有必要用UpdateRequest？     public  static IndexResponse add(String indexName, EsUser esUser) {         try {             IndexRequest request = new IndexRequest(indexName);             String jsonString = JSONObject.toJSONString(esUser);             request.index(indexName).id(String.valueOf(esUser.getId())).source(jsonString, XContentType.JSON);             IndexResponse response = getClient().index(request, RequestOptions.DEFAULT);             log.info("elastic 索引新增成功,response={}", response);             return response;         } catch (Exception e) {             e.printStackTrace();             log.error("索引数据变更失败", e);         }         return null;     }     public  static BulkResponse batchAdd(String indexName, List<EsUser> esUserList) {         try {             BulkRequest bulkRequest = new BulkRequest();             IndexRequest request = null;             for (EsUser esUser : esUserList) {                 request = new IndexRequest(indexName);                 request.index(indexName).id(esUser.getId() + "").source(XContentType.JSON,esUser);                 bulkRequest.add(request);             }             BulkResponse response = getClient().bulk(bulkRequest, RequestOptions.DEFAULT);             return response;         } catch (Exception e) {             log.error("批量插入索引失败", e);         }         return null;     }     public  static DeleteResponse delete(String indexName, Integer id) {         try {             DeleteRequest request = new DeleteRequest(indexName);             request.index(indexName).id(id + "");             DeleteResponse response = getClient().delete(request, RequestOptions.DEFAULT);             log.info("elastic 索引删除成功,response={}", response);             return response;         } catch (Exception e) {             e.printStackTrace();             log.error("索引数据变更失败", e);         }         return null;     }     // 索引创建------目前没用（直接添加数据）     public  static void createEsIndex(String indexName, String settings, String mappings) {         try {             CreateIndexRequest request = new CreateIndexRequest(indexName);             buildSetting(request, settings);             buildIndexMapping(request, mappings);             getClient().indices().create(request, RequestOptions.DEFAULT);             log.info("索引创建成功");         } catch (Exception e) {             log.error("索引创建失败:{}", e);         }     }     /**      * 设置分片      *      * @param request      */     private  static void buildSetting(CreateIndexRequest request, String settings) {         request.settings(settings, XContentType.JSON);     }     /**      * 设置索引的mapping      *      * @param request      */     private  static void buildIndexMapping(CreateIndexRequest request, String mappings) {         request.mapping(mappings, XContentType.JSON);     }     private static RestHighLevelClient restHighLevelClient;     public static RestHighLevelClient getClient() {         if (restHighLevelClient != null) {             return restHighLevelClient;         }         RestClientBuilder clientBuilder = RestClient.builder(new HttpHost("192.168.162.239", 9200, "http"));         // 设置监听器，每次节点失败都可以监听到，可以作额外处理         clientBuilder.setFailureListener(new RestClient.FailureListener() {             public void onFailure(Node node) {                 super.onFailure(node);             }         });         restHighLevelClient = new RestHighLevelClient(clientBuilder);         return restHighLevelClient;     } }

四、执行结果

2019-10-29 19:46:55.338 [demo] [main] INFO [demo.component.es.rest.EsKit] -elastic 索引新增成功,response=IndexResponse[index=demo_esuser,type=_doc,id=1,version=1,result=created,seqNo=15,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]

2019-10-29 19:46:55.520 [demo] [main] INFO [demo.component.es.rest.EsKit] -elastic 索引新增成功,response=IndexResponse[index=demo_esuser,type=_doc,id=2,version=3,result=updated,seqNo=16,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]

2019-10-29 19:46:55.565 [demo] [main] INFO [demo.component.es.rest.EsKit] -elastic 查询成功,getResponse={"_index":"demo_esuser","_type":"_doc","_id":"1","_version":1,"_seq_no":15,"_primary_term":1,"found":true,"_source":{"id":1,"name":"fansunion"}}

2019-10-29 19:46:55.633 [demo] [main] INFO [demo.component.es.rest.EsKit] -getUser=EsUser(id=1, name=fansunion)

2019-10-29 19:46:56.510 [demo] [main] INFO [demo.component.es.rest.EsKit] -search -> {"id":1,"name":"fansunion"}
2019-10-29 19:46:56.510 [demo] [main] INFO [demo.component.es.rest.EsKit] -userList=[EsUser(id=1, name=fansunion)]

2019-10-29 19:46:56.573 [demo] [main] INFO [demo.component.es.rest.EsKit] -elastic 索引删除成功,response=DeleteResponse[index=demo_esuser,type=_doc,id=1,version=2,result=deleted,shards=ShardInfo{total=2, successful=1, failures=[]}]

2019-10-29 19:46:56.593 [demo] [main] INFO [demo.component.es.rest.EsKit] -elastic 查询成功,getResponse={"_index":"demo_esuser","_type":"_doc","_id":"1","found":false}

2019-10-29 19:46:56.594 [demo] [main] INFO [demo.component.es.rest.EsKit] -删除之后，应该为null:null