2 - 基于ELK的ElasticSearch 7.8.x技术整理 - java操作篇

3、java操作ES篇

3.1、摸索java链接ES的流程

自行创建一个maven项目

3.1.1、依赖管理

点击查看代码



    <properties>

        <ES-version>7.8.0</ES-version>

        <log4j-version>1.2.17</log4j-version>

        <junit-version>4.13.2</junit-version>

        <jackson-version>2.13.0</jackson-version>

    </properties>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.elasticsearch</groupId>

                <artifactId>elasticsearch</artifactId>

                <!-- 注意：这里的版本问题，要和下载的window的ES版本一致，甚至后续用linux搭建也是一样的

                          到时用linux时，ES、kibana的版本都有这样的限定

                -->

                <version>${ES-version}</version>

            </dependency>

            <dependency>

                <groupId>org.elasticsearch.client</groupId>

                <!-- 注意：这里别搞成了elasticsearch-client

                    这个东西在7.x已经不推荐使用了，而到了8.0之后，这个elasticsearch-client已经完全被废弃了

                 -->

                <artifactId>elasticsearch-rest-high-level-client</artifactId>

                <!-- 同样的，注意版本问题 -->

                <version>${ES-version}</version>

            </dependency>

			<!-- 这个我其实没用，要用的话，可以导入：log4j-api和log4j-core -->

            <dependency>

                <groupId>log4j</groupId>

                <artifactId>log4j</artifactId>

                <version>${log4j-version}</version>

            </dependency>

            <dependency>

                <groupId>junit</groupId>

                <artifactId>junit</artifactId>

                <version>${junit-version}</version>

            </dependency>

            <dependency>

                <groupId>com.fasterxml.jackson.core</groupId>

                <artifactId>jackson-databind</artifactId>

                <version>${jackson-version}</version>

            </dependency>

        </dependencies>

    </dependencyManagement>

3.1.2、摸索链接流程

3.1.2.1、获取父项目中的依赖

点击查看代码



    <dependencies>

        <dependency>

            <groupId>org.elasticsearch</groupId>

            <artifactId>elasticsearch</artifactId>

        </dependency>

        <dependency>

            <groupId>org.elasticsearch.client</groupId>

            <artifactId>elasticsearch-rest-high-level-client</artifactId>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

        </dependency>

    </dependencies>

3.1.2.2、摸索流程

点击查看代码



package cn.zixieqing;

import org.apache.http.HttpHost;

import org.elasticsearch.client.RestClient;

import org.elasticsearch.client.RestClientBuilder;

import org.elasticsearch.client.RestHighLevelClient;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName ConnectionTest

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class ConnectionTest {

    /*

     * @Author ZiXieQing

     * @Description // TODO 测试java链接ES

     * @Date  2021/12/14

     * @Param

     * @return

     */

    // 下面这个逻辑，对照shiro中的realm、manager、FilterFactoryBean的逻辑来看（ 没用过的就当我没说^_^ )

    @Test

    public void test() throws IOException {

        // 3、创建HttpHost

        HttpHost host = new HttpHost("127.0.0.1", 9200);// 发现需要：String hostname, int port  这就很简单了涩

      // 当然：这个方法重载中有一个参数scheme  这个是：访问方式 根据需求用http / https都可以  这里想传的话用：http就可以了

        // 2、创建RestClientBuilder 但是：点击源码发现 - 没有构造方法

        // 既然没有，那肯定提供得有和xml版的mybatis加载完xml文件之后的builder之类的，找一下

        RestClientBuilder clientBuilder = RestClient.builder(host);

        // 发现1、有重载；2、重载之中有几个参数，而HttpHost... hosts 这个参数貌似贴近我们想要的东西了，所以建一个HttpHost

        // 1、要链接client，那肯定需要一个client咯，正好：导入得有high-level-client

        RestHighLevelClient esClient = new RestHighLevelClient(clientBuilder);   // 发现需要RestClientBuilder，那就建

        // 4、测试：只要 esClient. 就可以看到一些很熟悉的方法，可以在这里测试调一下哪些方法，然后去postman中获取数据看一下对不对

        // 这里不多做说明：java链接ES客户端的流程就是上面这样的，不过：这和MySQL数据库链接一样，记得不用了就关闭

        esClient.close();       // 当然：封装之后，这个关闭操作应该放出来，然后在封装的工具中只需要返回这个链接对象即可

    }

}

3.2、java中操作ES索引

3.2.1、向父项目获取自己要的依赖

点击查看代码



    <dependencies>

        <dependency>

            <groupId>org.elasticsearch</groupId>

            <artifactId>elasticsearch</artifactId>

        </dependency>

        <dependency>

            <groupId>org.elasticsearch.client</groupId>

            <artifactId>elasticsearch-rest-high-level-client</artifactId>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

3.2.2、封装链接对象

点击查看代码



package cn.zixieqing.utile;

import org.apache.http.HttpHost;

import org.elasticsearch.client.RestClient;

import org.elasticsearch.client.RestHighLevelClient;

/**

 * @ClassName ESClientUtil

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class ESClientUtil {

    private static final String HOST = "127.0.0.1";     // 用localhost也行，不过后面用linux就要ip，所以：算在这里养成习惯吧

    private static final Integer PORT = 9200;

    public static RestHighLevelClient getESClient() {

        return new RestHighLevelClient( RestClient.builder( new HttpHost( HOST, PORT ) ) );

    }

}

3.2.3、创建索引

点击查看代码



package cn.zixieqing;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.elasticsearch.client.indices.CreateIndexRequest;

import org.elasticsearch.client.indices.CreateIndexResponse;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName CreateIndex

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class CreateIndex {

    @Test

    public void createIndexTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 创建索引

        // CreateIndexRequest()  第一个参数：要创建的索引名    第二个参数：请求选项  默认即可

        CreateIndexResponse response = esClient.indices().create(

                new CreateIndexRequest("person"), RequestOptions.DEFAULT );

        // 查看是否添加成功  核心方法：isAcknowledged()

        System.out.println( response.isAcknowledged() );

        esClient.close();

    }

}

用postman检验一下：

3.2.4、查询索引

点击查看代码



package cn.zixieqing.index;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.elasticsearch.client.indices.GetIndexRequest;

import org.elasticsearch.client.indices.GetIndexResponse;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName SearchIndex

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class SearchIndex {

    /*

     * @Author ZiXieQing

     * @Description // TODO 查询索引

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void searchIndexTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 获取索引

        GetIndexResponse response = esClient.indices().get(

                new GetIndexRequest("person"), RequestOptions.DEFAULT );

        // 熟悉GetIndexResponse中的几个api

        System.out.println( "Aliases" + response.getAliases() );

        System.out.println( "Mappings" + response.getMappings() );

        System.out.println( "Settings" + response.getSettings() );      // 这三者在用postman玩的时候，返回结果中都有

        esClient.close();

    }

}

3.2.5、删除索引

点击查看代码



package cn.zixieqing.index;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;

import org.elasticsearch.action.support.master.AcknowledgedResponse;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName DeleteIndex

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class DeleteIndex {

    /*

     * @Author ZiXieQing

     * @Description // TODO 删除索引

     * @Date  2021/12/14

     * @Param

     * @return

     */

    @Test

    public void deleteIndexTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 删除索引

        AcknowledgedResponse response = esClient.indices().delete(

                new DeleteIndexRequest("person"), RequestOptions.DEFAULT );

        // 检验一下：是否删除成功

        System.out.println( response.isAcknowledged() );

        esClient.close();

    }

}

用postman再检测一下：

3.3、java操作ES中的_doc - 重点中的重点

3.3.1、创建doc

这里还需要jackson-databind：前面已经导入
同时：为了偷懒，所以把lombok也一起导入了
父项目依赖管理

点击查看代码



        <lombok-version>1.18.22</lombok-version>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>${lombok-version}</version>

        </dependency>

子项目获取依赖：

点击查看代码



        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

        </dependency>

编写实体类

点击查看代码

package cn.zixieqing.entity;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

import lombok.ToString;

import lombok.experimental.Accessors;

import java.io.Serializable;

/**

 * @ClassName UserEntity

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

@Data

@AllArgsConstructor

@NoArgsConstructor

@ToString

@Accessors(chain = true)        // lombok的链式调用

public class UserEntity implements Serializable {

    private String id;

    private String name;

    private String sex;

}

测试：

点击查看代码



package cn.zixieqing.doc;

import cn.zixieqing.entity.UserEntity;

import cn.zixieqing.utile.ESClientUtil;

import com.fasterxml.jackson.databind.ObjectMapper;

import org.elasticsearch.action.index.IndexRequest;

import org.elasticsearch.action.index.IndexResponse;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.elasticsearch.common.xcontent.XContentType;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName InsertDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class InsertDoc {

    /*

     * @Author ZiXieQing

     * @Description // TODO 新增文档_doc，当然下面这个过程利用ESClient封装的思路也可以抽离

     * @Date  2021/12/14

     * @Param

     * @return

     */

    @Test

    public void insertDocTest() throws IOException {

        // 1、获取链接

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        IndexRequest request = new IndexRequest();

        // 选择索引及设置唯一标识

        request.index("user").id("10002");

        // 2、添加数据

        // IndexRequest和IndexResponse这中间就是：做添加doc操作

        UserEntity userEntity = new UserEntity();

        userEntity.setId( "100" ).setName( "紫邪情" ).setSex( "女" );     // lombok链式调用

        // 转json      注：objectMapper是jackson-databind中的，不是ES中的

        String userJson = new ObjectMapper().writeValueAsString( userEntity );

        // 把转成的json字符串存到ES中去

        request.source( userJson , XContentType.JSON);

        // 3、发起请求 获取响应对象

        IndexResponse response = esClient.index( request, RequestOptions.DEFAULT );

        // 看看这个IndexResponse有哪些有用的api

        System.out.println( "响应转态：" + response.getResult() );   // 其他的一点 就可以看到了，都是字面意思

        esClient.close();

    }

}

**postman检测一下：

我的测试结构如下：

3.3.2、修改doc

这个修改是指的局部修改，全量修改就不用想了

点击查看代码

package cn.zixieqing.doc;

import cn.zixieqing.utile.ESClientUtil;

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.xcontent.XContentType;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName DeleteDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class UpdateDoc {

    /*

     * @Author ZiXieQing

     * @Description // TODO 删除doc

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void deleteDoc() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        UpdateRequest request = new UpdateRequest();

        // 获取索引

        request.index("user").id("10002");

        // 2、修改doc数据

        request.doc(XContentType.JSON, "name", "邪公子");

        // 3、发起请求、获得响应对象

        UpdateResponse response = esClient.update(request, RequestOptions.DEFAULT);

        System.out.println( "响应状态为：" + response.getResult() );

        esClient.close();

    }

}

postman检验一下：

3.3.3、查询doc

点击查看代码



package cn.zixieqing.doc;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.action.get.GetRequest;

import org.elasticsearch.action.get.GetResponse;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName GetDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class GetDoc {

    @Test

    public void getDocTest() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        GetRequest request = new GetRequest();

        request.index("user").id("10002");

        // 2、发起请求、获取响应对象

        GetResponse response = esClient.get(request, RequestOptions.DEFAULT);

        // 3、获取结果  推荐用getSourceAsString()

        String result = response.getSourceAsString();

        System.out.println( "获得的doc为：" + result );

        esClient.close();

    }

}

3.3.4、删除doc

点击查看代码



package cn.zixieqing.doc;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.action.delete.DeleteRequest;

import org.elasticsearch.action.delete.DeleteResponse;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName DeleteDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class DeleteDoc {

    /*

     * @Author ZiXieQing

     * @Description // TODO 删除doc

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void deleteDocTest() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        DeleteRequest request = new DeleteRequest();

        // 获取索引

        request.index("user").id("10002");

        // 2、做删除操作

        DeleteResponse response = esClient.delete(request, RequestOptions.DEFAULT);

        System.out.println( "响应状态为：" + response.getResult() );

        // 3、关闭链接

        esClient.close();

    }

}

再次获取检验一下：

3.4.5、批量新增_doc数据

本质：把请求封装了而已，从而让这个请求可以传递各种类型参数，如：删除的、修改的、新增的，这样就可以搭配for循环

点击查看代码



package cn.zixieqing.doc;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.action.bulk.BulkRequest;

import org.elasticsearch.action.bulk.BulkResponse;

import org.elasticsearch.action.index.IndexRequest;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.elasticsearch.common.xcontent.XContentType;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName BatchDeleteDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class BatchInsertDoc {

    /*

     * @Author ZiXieQing

     * @Description // TODO 批量添加doc数据

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void batchInsertDocTest() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        BulkRequest request = new BulkRequest();

        // 当然：source的第二个参数都是传个对象，这里为了偷懒，嫖了别人的代码

        request.add( new IndexRequest()

                .index("user")

                .id("520")

                .source( XContentType.JSON, "name", "小紫1") );

        request.add( new IndexRequest()

                .index("user")

                .id("521")

                .source( XContentType.JSON, "name", "小紫2") );

        request.add( new IndexRequest()

                .index("user")

                .id("522")

                .source( XContentType.JSON, "name", "小紫3") );

        // 2、发送请求

        BulkResponse response = esClient.bulk( request, RequestOptions.DEFAULT );

        // 查看执行时间

        System.out.println( response.getTook() );

        esClient.close();

    }

}

postman检验一下：

点击查看代码



http://127.0.0.1:9200/user/_search		请求方式 get

// 返回结果

{

    "took": 585,

    "timed_out": false,

    "_shards": {

        "total": 1,

        "successful": 1,

        "skipped": 0,

        "failed": 0

    },

    "hits": {

        "total": {

            "value": 3,

            "relation": "eq"

        },

        "max_score": 1.0,

        "hits": [

            {

                "_index": "user",

                "_type": "_doc",

                "_id": "520",

                "_score": 1.0,

                "_source": {

                    "name": "小紫1"

                }

            },

            {

                "_index": "user",

                "_type": "_doc",

                "_id": "521",

                "_score": 1.0,

                "_source": {

                    "name": "小紫2"

                }

            },

            {

                "_index": "user",

                "_type": "_doc",

                "_id": "522",

                "_score": 1.0,

                "_source": {

                    "name": "小紫3"

                }

            }

        ]

    }

}

3.4.6、批量删除_doc数据

本质：把请求封装了而已，从而让这个请求可以传递各种类型参数，如：删除的、修改的、新增的，这样就可以搭配for循环

点击查看代码



package cn.zixieqing.doc;

import cn.zixieqing.utile.ESClientUtil;

import org.elasticsearch.action.bulk.BulkRequest;

import org.elasticsearch.action.bulk.BulkResponse;

import org.elasticsearch.action.delete.DeleteRequest;

import org.elasticsearch.client.RequestOptions;

import org.elasticsearch.client.RestHighLevelClient;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName BarchDeleteDoc

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class BatchDeleteDoc {

    /*

     * @Author ZiXieQing

     * @Description // TODO 批量删除doc数据

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void batchDeleteDoc() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        BulkRequest request = new BulkRequest();

        // 和批量添加相比，变的地方就在这里而已

        request.add(new DeleteRequest().index("user").id("520"));

        request.add(new DeleteRequest().index("user").id("521"));

        request.add(new DeleteRequest().index("user").id("522"));

        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);

        System.out.println(response.getTook());

        esClient.close();

    }

}

postman检验一下：

3.4.7、高级查询 - 重点

3.4.7.1、全量查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName MatchAll

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class MatchAll {

    /*

     * @Author ZiXieQing

     * @Description // TODO 高级查询 - 全量查询  就是基础语法中在请求体内使用match_all那个知识点

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void matchAllTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 全量查询 match_all

        SearchResponse response = esClient.search(  new SearchRequest()

                                                        .indices("user")

                                                        .source(

                                                            new SearchSourceBuilder()

                                                                .query( QueryBuilders.matchAllQuery() )

                                                        ), RequestOptions.DEFAULT );

        // 查看执行了多少时间

        System.out.println( response.getTook() );

        // 把数据遍历出来看一下

        for ( SearchHit data : response.getHits() ) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

        // 上面的看不懂，那就看下面拆分的过程

//        // 1、获取链接对象

//        RestHighLevelClient esClient = ESClientUtil.getESClient();

//

//        // 3、创建SearchRequest对象

//        SearchRequest request = new SearchRequest();

//        request.indices("user");

//

//        // 5、创建SearchSourceBuilder对象

//        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

//

//        // 6、进行查询  发现：需要QueryBuilders对象，看源码发现：没有构造，可是：有matchAllQuery()

//        searchSourceBuilder.query( QueryBuilders.matchAllQuery() );

//

//        // 4、调用source()方法获取数据，但是发现：需要SearchSourceBuilder，继续创建

//        request.source( searchSourceBuilder );

//

//        // 2、发送请求  发现：需要SearchRequest  那就建一个

//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

//

//        // 7、获取数据

//        for (SearchHit data : response.getHits()) {

//            System.out.println( data.getSourceAsString() );

//        }

//

//        // 8、关闭链接

//        esClient.close();

    }

}

3.4.7.2、条件查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName TermQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class TermQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO term条件查询  注意：这里不是说的基础篇中的 filter range 那个条件啊（ 这个条件要求的是查询字段为int类型的 ）

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void termQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 条件查询

        SearchResponse response = esClient.search( new SearchRequest()

                                                    .indices("user")

                                                    .source( new SearchSourceBuilder()

                                                             .query( QueryBuilders.termQuery("_id", "520" ) ) ),  // 对照全量查询：变的就是这里的方法调用

                                                    RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

3.4.7.3、分页查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName LimitQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class LimitQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 分页查询    对应基础篇中的from size

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void limitQueryTest() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 3、创建SearchSourceBuilder

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 4、查询出所有的数据

        SearchSourceBuilder sourceBuilder = searchSourceBuilder.query( QueryBuilders.matchAllQuery() );

        // 5、对数据进行分页操作

        sourceBuilder.from(0);

        sourceBuilder.size(2);

        // 2、发送请求

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .indices("user")

                                                        .source( searchSourceBuilder )

                                                    , RequestOptions.DEFAULT );

        // 7、查看数据

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        // 8、关闭链接

        esClient.close();

    }

}

3.4.7.4、排序查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.elasticsearch.search.sort.SortOrder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName SortQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class SortQuery {

    @Test

    public void sortQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        SearchSourceBuilder sourceBuilder = searchSourceBuilder.query( QueryBuilders.matchAllQuery() );

        // 排序  以什么字段排序、排序方式是什么( 注意：别犯低级错误啊，用字符串来搞排序 ）

        sourceBuilder.sort("_id", SortOrder.DESC);

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .indices("user")

                                                        .source( searchSourceBuilder ),

                                                   RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

3.4.7.5、条件过滤查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName FilterQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class FilterQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 查询过滤

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void filterQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 查询结果只需要什么？

        String[] includes = { "name" };

        // 查询结果不需要什么？

        String[] excludes = {};     // 根据需求自行填充

        searchSourceBuilder.fetchSource( includes,excludes );

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .indices("user")

                                                        .source( searchSourceBuilder )

                                                    , RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

我的数据没弄好，我建的doc中只有一个name，而老衲又懒得加了，所以：这里别让结果把自己搞混了

3.4.7.6、组合查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.BoolQueryBuilder;

import org.elasticsearch.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName UnionQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class UnionQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 组合查询至must查询

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void mustQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 注意：这里产生了改变，是调用的boolQuery()

        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        // 必须包含什么？

        boolQuery.must( QueryBuilders.matchQuery("author", "邪") );

        boolQuery.must( QueryBuilders.matchQuery("sex", "girl") );

        // 当然：也就有mustNot()不包含什么了

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .source( new SearchSourceBuilder()

                                                                    .query( boolQuery ) )

                                                    , RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

    /*

     * @Author ZiXieQing

     * @Description // TODO 组合查询之should查询

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void shouldQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

        // 懒得烧蛇吃  不写了，知道这个should和must一样，复制粘贴多个条件即可

        boolQuery.should( QueryBuilders.matchQuery("title", "是") );

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .source( new SearchSourceBuilder()

                                                                    .query(boolQuery) )

                                                    , RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

must查询的结果：

should查询的结果

3.4.7.7、范围查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.index.query.RangeQueryBuilder;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName RangeQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class RangeQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 范围查询  即：基础篇中的filter  range

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void rangeQuery() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("id");

        // 对结果进行处理  gt >  lt <   gte >=     lte  <=

        rangeQuery.gt("10000");

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .source( new SearchSourceBuilder()

                                                                    .query( rangeQuery ) )

                                                    , RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

3.4.7.8、模糊查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.Fuzziness;

import org.elasticsearch.index.query.FuzzyQueryBuilder;

import org.elasticsearch.index.query.QueryBuilders;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName FuzzyQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class FuzzyQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 模糊查询

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void fuzzyQuery() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 模糊查询

        // fuzziness( Fuzziness.ONE ) 表示的是：字符误差数  取值有：zero、one、two、auto

        // 误差数  指的是：fuzzyQuery("author","网二")这里面匹配的字符的误差嘛

        //                  可以有几个字符不一样 / 多 / 少几个字符？

        FuzzyQueryBuilder fuzzyQuery = QueryBuilders.fuzzyQuery("author","网二").fuzziness( Fuzziness.ONE );

        SearchResponse response = esClient.search( new SearchRequest()

                                                        .source( new SearchSourceBuilder()

                                                                        .query(fuzzyQuery) )

                                                    , RequestOptions.DEFAULT );

        for (SearchHit data : response.getHits()) {

            System.out.println( data.getSourceAsString() );

        }

        esClient.close();

    }

}

3.4.7.9、高亮查询

点击查看代码



package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.index.query.QueryBuilders;

import org.elasticsearch.index.query.TermsQueryBuilder;

import org.elasticsearch.search.SearchHit;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName HighLightQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

public class HighLightQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 高亮查询 highLight

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void highLightQueryTest() throws IOException {

        // 1、获取链接对象

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        // 3、创建SearchSourceBuilder对象

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 4、查询什么数据？

        TermsQueryBuilder termsQuery = QueryBuilders.termsQuery("author", "小紫1");

        // 5、构建高亮

        HighlightBuilder highlightBuilder = new HighlightBuilder();

        // 高亮编写

        highlightBuilder.preTags("<span color='blue'>");    // 构建标签前缀

        highlightBuilder.postTags("</span>");       // 构建标签后缀

        highlightBuilder.field("author");     // 构建高亮字段

        // 6、设置高亮

        searchSourceBuilder.highlighter( highlightBuilder );

        // 7、进行查询

        searchSourceBuilder.query( termsQuery );

        // 2、发送请求、获取响应对象

        SearchResponse response = esClient.search( new SearchRequest().indices("user").source( searchSourceBuilder ) , RequestOptions.DEFAULT);

        // 验证

        System.out.println(response);

        for (SearchHit hit : response.getHits()) {

            System.out.println(hit.getSourceAsString());

            System.out.println( hit.getHighlightFields());

        }

        // 9、关闭链接

        esClient.close();

    }

}

3.4.7.10、聚合查询

点击查看代码

package cn.zixieqing.docHighLevel.queryDoc;

import cn.zixieqing.utile.ESClientUtil;

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.search.aggregations.AggregationBuilders;

import org.elasticsearch.search.builder.SearchSourceBuilder;

import org.junit.Test;

import java.io.IOException;

/**

 * @ClassName AggQuery

 * @Author ZiXieQing

 * @Date 2021/12/14

 * Version 1.0

 **/

// 聚合查询

public class AggQuery {

    /*

     * @Author ZiXieQing

     * @Description // TODO 最大值查询

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void maxQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // max("maxId")  这个名字是随便取的  不讲究，就是取个名字而已        联想：有max、就有min、avg、count、sum......

        //                                  注：方法变成term()就是分组了

        // field("_id")  对哪个字段求最大值

        searchSourceBuilder.aggregation( AggregationBuilders.max("maxId").field("id") );

        SearchResponse response = esClient.search(new SearchRequest().source(searchSourceBuilder), RequestOptions.DEFAULT);

        // 检验

        System.out.println(response);

        esClient.close();

    }

    /*

     * @Author ZiXieQing

     * @Description // TODO 分组查询

     * @Date  2021/12/14

     * @Param []

     * @return void

     */

    @Test

    public void groupQueryTest() throws IOException {

        RestHighLevelClient esClient = ESClientUtil.getESClient();

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        // 分组

        searchSourceBuilder.aggregation( AggregationBuilders.terms("groupQuery").field("author") );

        SearchResponse response = esClient.search( new SearchRequest().source(searchSourceBuilder), RequestOptions.DEFAULT);

        System.out.println(response);

        esClient.close();

    }

}

4、进阶篇链接

https://www.cnblogs.com/xiegongzi/p/15757337.html

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3、java操作ES篇

3.1、摸索java链接ES的流程

3.1.1、依赖管理

3.1.2、摸索链接流程

3.1.2.1、获取父项目中的依赖

3.1.2.2、摸索流程

3.2、java中操作ES索引

3.2.1、向父项目获取自己要的依赖

3.2.2、封装链接对象

3.2.3、创建索引

3.2.4、查询索引

3.2.5、删除索引

3.3、java操作ES中的_doc - 重点中的重点

3.3.1、创建doc

3.3.2、修改doc

3.3.3、查询doc

3.3.4、删除doc

3.4.5、批量新增_doc数据

3.4.6、批量删除_doc数据

3.4.7、高级查询 - 重点

3.4.7.1、全量查询

3.4.7.2、条件查询

3.4.7.3、分页查询

3.4.7.4、排序查询

3.4.7.5、条件过滤查询

3.4.7.6、组合查询

3.4.7.7、范围查询

3.4.7.8、模糊查询

3.4.7.9、高亮查询

3.4.7.10、聚合查询

4、进阶篇链接

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