ElasticSearch使用Java API進行索引文檔的操作

ElasticSearch版本：7.6.2
首先構建maven項目，導入依賴：

<?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>2.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.tc</groupId>
    <artifactId>elasticsearch-api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>elasticsearch-api</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.68</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <version>2.3.1.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

聲明一個Rest客戶端作爲Bean：

@Configuration
public class ElasticSearchClientConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost",9200,"http"))
        );
        return client;
    }

}

索引相關操作：

package com.tc.elasticsearchapi.controller;

import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.io.IOException;

@RestController
public class IndexController {

    @Resource
    public RestHighLevelClient restHighLevelClient;

    @RequestMapping("/createIndex")
    @ResponseBody
    public String createIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("i_index");
        CreateIndexResponse createIndexResponse = restHighLevelClient.
                indices().create(request, RequestOptions.DEFAULT);
        return createIndexResponse.toString();
    }

    @RequestMapping("/isExist")
    @ResponseBody
    public String indexIsExist(String index) throws IOException {
        GetIndexRequest request = new GetIndexRequest(index);
        boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
        return "status:"+exists;
    }
    @RequestMapping("/delete")
    @ResponseBody
    public String indexDelete(String index) throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest(index);
        AcknowledgedResponse delete = restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
        return delete.isAcknowledged()?"success":"failed";
    }
}

文檔相關操作：

package com.tc.elasticsearchapi.controller;

import com.alibaba.fastjson.JSON;
import com.tc.elasticsearchapi.entity.User;
import org.apache.lucene.index.IndexReader;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
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.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * 文檔操作
 */
@RestController
public class DocumentController {

    @Resource
    public RestHighLevelClient client;
    /**
     * 創建文檔
     */
    @ResponseBody
    @RequestMapping("/createDocument")
    public String createDocument(String index) throws IOException {
        User user = new User(1,"anroy");
        //創建請求
        IndexRequest request = new IndexRequest(index);
        request.id("1");
        request.timeout("1s");
        request.source(JSON.toJSONString(user), XContentType.JSON);
        IndexResponse response = client.index(request, RequestOptions.DEFAULT);
        return response.toString();
    }
    /**
     * 判斷文檔是否存在
     */
    @ResponseBody
    @RequestMapping("/docIsExist")
    public String docIsExist(String index,String id) throws IOException {
        GetRequest request = new GetRequest(index,id);
        //不獲取返回的上下文信息
//        request.fetchSourceContext(new FetchSourceContext(false));
        request.storedFields("_none_");
        boolean exists = client.exists(request, RequestOptions.DEFAULT);
        return exists?"true":"false";
    }
    /**
     * 獲取文檔
     */
    @ResponseBody
    @RequestMapping("/getDoc")
    public String getDoc(String index,String id) throws IOException {
        GetRequest request = new GetRequest(index,id);
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
        //打印全部內容
        System.out.println(response);
        //文檔格式
        return response.getSourceAsString();
    }
    /**
     * 更新文檔
     */
    @ResponseBody
    @RequestMapping("/updateDoc")
    public String updateDoc(String index,String id) throws IOException {
        UpdateRequest request = new UpdateRequest(index,id);
        User user = new User(2,"ljq");
        request.doc(JSON.toJSONString(user),XContentType.JSON);
        UpdateResponse update = client.update(request, RequestOptions.DEFAULT);
        return update.toString();
    }
    /**
     * 批量插入
     */
    @ResponseBody
    @RequestMapping("/bulkRequest")
    public String bulkRequest(String index,String id) throws IOException {
        BulkRequest request = new BulkRequest();
        request.timeout("10s");
        List<User> list = new ArrayList<>();
        list.add(new User(2,"ljq1"));
        list.add(new User(3,"ljq3"));
        list.add(new User(4,"ljq4"));

        for (int i=0;i<list.size();i++){
            request.add(new IndexRequest(index).id(""+(i+1))
                    .source(JSON.toJSONString(list.get(i)),XContentType.JSON));
        }

        BulkResponse bulk = client.bulk(request, RequestOptions.DEFAULT);
        return !bulk.hasFailures()?"success":"failed";
    }
    /**
     * 查詢請求
     * http://localhost:8080/search?index=i_index&name=name&value=ljq1
     */
    @RequestMapping("/search")
    public String search(String index,String name,String value) throws IOException {
        SearchRequest request = new SearchRequest(index);
        //構建搜索條件
        SearchSourceBuilder builder = new SearchSourceBuilder();
        //查詢條件，可以使用 QueryBuilders
        //精確查詢用termQuery
        //查詢全部用 QueryBuilders.matchAllQuery()
        TermQueryBuilder query = QueryBuilders.termQuery(name, value);
        builder.query(query);
        builder.timeout(new TimeValue(60, TimeUnit.SECONDS));
        request.source(builder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
        System.out.println(JSON.toJSONString(response.getHits()));
//        SearchHit[] hits = response.getHits().getHits();
        for(SearchHit fields:response.getHits().getHits()){
            System.out.println(fields.getSourceAsMap());
        }
        return response.status().toString();
    }

}

操作的結果可以在head插件中看到：