• ElasticSearch(10)—SpringBoot集成ES


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    上一篇:ElasticSearch(9)—Rest风格
    SpringBoot项目集成ES
    一、引入依赖

       首先创建一个springboot项目,并勾选下图中的一些基本依赖:

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    官方文档es-client依赖

    按照官方文档,springboot项目集成es首先需要导入es客户端,但是因为在创建项目的时候勾选了elasticsearch的起步依赖,查看该起步依赖发现底层已经引用了高级客户端 rest-high-level-client依赖。

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    然后在springboot项目的maven依赖中查看elasticsearch使用的依赖版本是6.8.7,
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    为了保证我们导入的依赖版本与es版本一致,所以手动调整es依赖的版本号,在pom.xml文件中进行调整:
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    二、创建客户端实例

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    @Configuration
    public class ElasticSearchClientConfig {
    
      @Bean
      public RestHighLevelClient restHighLevelClient() {
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
            RestClient.builder(
                new HttpHost("127.0.0.1", 9200, "http")));
        //如果是集群,则在此处可以new 多个HttpHost
    	//new HttpHost("127.0.0.1", 9201, "http")));
        return restHighLevelClient;
      }
    }
    
    
    二、测试es-api的使用

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    1.创建一个索引
    创建一个实体类,将文档数据声明在该实体类中:
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    package org.magic.esapi.entiy;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data//生成set get方法
    @AllArgsConstructor//有参构造函数
    @NoArgsConstructor//无参构造函数
    public class User {
    
      private String name;
    
      private Integer age;
    
      private String address;
    
    }
    
    

    2. 创建客户端实例

    @Configuration
    public class ElasticSearchClientConfig {
    
      @Bean
      public RestHighLevelClient restHighLevelClient() {
        RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(
                //如果是集群,则此处可以多new 几个HttpHost
    //            new HttpHost("localhost", 9200, "http"),
                new HttpHost("localhost", 9200, "http")));
        return client;
      }
    }
    

    3. 测试api的使用

    以下api操作结果可是结合elasticsearch-head插件来查看操作的结果;

    package org.magic.esapi;
    
    import com.alibaba.fastjson.JSON;
    import java.io.IOException;
    import java.util.ArrayList;
    import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
    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.action.support.master.AcknowledgedResponse;
    import org.elasticsearch.action.update.UpdateRequest;
    import org.elasticsearch.action.update.UpdateResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.client.indices.GetIndexRequest;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.elasticsearch.search.SearchHit;
    import org.junit.jupiter.api.Test;
    import org.magic.esapi.entiy.User;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
    
    @SpringBootTest
    class EsApiApplicationTests {
    
      private static final String index_name = "user_info";
    
    
      @Autowired
      private RestHighLevelClient restHighLevelClient;
    
      @Autowired
      private ElasticsearchRestTemplate elasticsearchRestTemplate;
    
      /**
       * 创建一个索引库
       *
       * @throws IOException
       */
      @Test
      void createIndex() throws IOException {
        boolean result = elasticsearchRestTemplate.createIndex("liqiang");
        System.out.println(result);
       /* CreateIndexRequest createIndexRequest = new CreateIndexRequest(index_name);
        CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
        //打印创建结果
        System.out.println(createIndexResponse.isAcknowledged());*/
      }
    
      /**
       * 判断索引库是否存在
       */
      @Test
      void searchIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest(index_name);
        boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
        System.out.println(exists);
      }
    
      /**
       * 删除索引库
       */
      @Test
      void removeIndex() throws IOException {
    
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest(index_name);
        AcknowledgedResponse response = restHighLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);
        //打印删除结果
        System.out.println(response.isAcknowledged());
      }
    
      /**
       * 创建文档
       */
      @Test
      void createDoc() throws IOException {
        User user = new User("张三", 20, "北京市");
        IndexRequest indexRequest = new IndexRequest(index_name);
        indexRequest.id("1");
        indexRequest.timeout("1s");
        IndexRequest request = indexRequest.source(JSON.toJSONString(user), XContentType.JSON);
        IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
        System.out.println(response.status());
      }
    
      /**
       * 查询文档
       */
      @Test
      void queryDoc() throws IOException {
        GetRequest getRequest = new GetRequest(index_name, "1");
        GetResponse response = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
        System.out.println(response.getSource());
      }
    
      /**
       * 修改文档
       */
      @Test
      void updateDoc() throws IOException {
        UpdateRequest updateRequest = new UpdateRequest(index_name, "1");
        User user = new User("李四", 55, "成都市");
        updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);
        updateRequest.timeout("1s");
        UpdateResponse response = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
        System.out.println(response.status());
      }
    
      /**
       * 删除指定文档
       */
      @Test
      void removeDoc() throws IOException {
        DeleteRequest deleteRequest = new DeleteRequest(index_name, "1");
        DeleteResponse response = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
        System.out.println(response.status());
      }
    
      /**
       * 批量插入文档
       */
      @Test
      void bulkCreateDoc() throws IOException {
        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("10s");
        ArrayList<User> userList = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
          userList.add(new User("张三" + i, 25 + i, "成都" + i));
        }
        for (int i = 0; i < userList.size(); i++) {
          bulkRequest.add(new IndexRequest(index_name)
              .id(String.valueOf(i))
              .source(JSON.toJSONString(userList.get(i)), XContentType.JSON));
        }
        BulkResponse response = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        System.out.println(response.status());
      }
    
      /**
       * 批量查询文档
       */
      @Test
      void queryDocList() throws IOException {
        SearchRequest searchRequest = new SearchRequest(index_name);
    
        /*
    
    
        //指定条件查询
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //查询年龄为25的index_info索引库中的数据
        TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("age", 25);
        searchSourceBuilder.query(termQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : response.getHits()) {
          System.out.println(hit.getSourceAsString());
        }
    
    
         */
    
        //查询索引库中所有的文档数据
        SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
        for (SearchHit hit : response.getHits()) {
          System.out.println(hit.getSourceAsString());
        }
      }
    }
    
    
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  • 原文地址:https://www.cnblogs.com/wgty/p/12810389.html
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