Elasticsearch 学习-javaAPI操作

Elasticsearch 学习-javaAPI操作

目录

Elasticsearch 软件是由 Java 语言开发的，所以也可以通过 Java API 的方式对 Elasticsearch服务进行访问

2.2.5.1 创建 Maven 项目

我们在 IDEA 开发工具中创建 Maven 项目(模块也可)ES

1.修改pom文件，增买家Maven依赖关系
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>es-study</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.8.0</version>
        </dependency>
        <!-- elasticsearch的客户端 -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.8.0</version>
        </dependency>
        <!-- elasticsearch依赖2.x的log4j -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.8.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.8.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.9</version>
        </dependency>
        <!-- junit单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.11.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.11.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-jcl</artifactId>
            <version>2.11.2</version>
        </dependency>
    </dependencies>

</project>

2.2.5.2 客户端对象

创建 com.atguigu.es.test.Elasticsearch01_Client 类，代码中创建 Elasticsearch 客户端对象

因为早期版本的客户端对象已经不再推荐使用，且在未来版本中会被删除，所以这里我们采

用高级 REST 客户端对象

package com.wt.test;

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

public class ESTest_Client {
    public static void main(String[] args) throws Exception {

        // 创建ES客户端
        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 关闭ES客户端
        esClient.close();
    }
}

2.2.5.3 索引操作

ES 服务器正常启动后，可以通过 Java API 客户端对象对 ES 索引进行操作

1.增加索引
package com.wt.test;

import org.apache.http.HttpHost;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;

public class ESTest_Index_Create {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 创建索引
        CreateIndexRequest request = new CreateIndexRequest("idea_create_index");
        CreateIndexResponse createIndexResponse =
                esClient.indices().create(request, RequestOptions.DEFAULT);

        // 响应状态
        boolean acknowledged = createIndexResponse.isAcknowledged();
        System.out.println("索引操作 ：" + acknowledged);

        esClient.close();
    }
}
2.删除索引
package com.wt.test;

import org.apache.http.HttpHost;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.client.indices.GetIndexResponse;

public class ESTest_Index_Delete {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 查询索引
        DeleteIndexRequest request = new DeleteIndexRequest("idea_create_index");

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

        // 响应状态
        System.out.println(response.isAcknowledged());

        esClient.close();
    }
}
3.搜索索引
package com.wt.test;

import org.apache.http.HttpHost;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
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.elasticsearch.client.indices.GetIndexResponse;

public class ESTest_Index_Search {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 查询索引
        GetIndexRequest request = new GetIndexRequest("stu","shopping");

        GetIndexResponse getIndexResponse =
                esClient.indices().get(request, RequestOptions.DEFAULT);

        // 响应状态
        System.out.println(getIndexResponse.getAliases());
        System.out.println(getIndexResponse.getMappings());
        System.out.println(getIndexResponse.getSettings());

        esClient.close();
    }
}

2.2.5.4 文档操作

1.新增文档
package com.wt.test;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHost;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.client.indices.GetIndexResponse;
import org.elasticsearch.common.xcontent.XContentType;

public class ESTest_Doc_Insert {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 插入数据
        IndexRequest request = new IndexRequest();
        request.index("shopping").id("A0001");

        User user = new User();
        user.setName("idea_person");
        user.setAge(15);
        user.setSex("男");

        // 向ES插入数据，必须将数据转换位JSON格式
        ObjectMapper mapper = new ObjectMapper();
        String userJson = mapper.writeValueAsString(user);
        request.source(userJson, XContentType.JSON);

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

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

        esClient.close();
    }
}


/*批量新增*/
package com.wt.test;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHost;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;

public class ESTest_Doc_Insert_Batch {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 批量插入数据
        BulkRequest request = new BulkRequest();

//        request.add(new IndexRequest().index("user").id("1001").source(XContentType.JSON, "name", "zhangsan", "age",30,"sex","男"));
//        request.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON, "name", "lisi", "age",30,"sex","女"));
//        request.add(new IndexRequest().index("user").id("1003").source(XContentType.JSON, "name", "wangwu", "age",40,"sex","男"));
//        request.add(new IndexRequest().index("user").id("1004").source(XContentType.JSON, "name", "wangwu1", "age",40,"sex","女"));
//        request.add(new IndexRequest().index("user").id("1005").source(XContentType.JSON, "name", "wangwu2", "age",50,"sex","男"));
//        request.add(new IndexRequest().index("user").id("1006").source(XContentType.JSON, "name", "wangwu3", "age",50,"sex","男"));
        //request.add(new IndexRequest().index("user").id("1007").source(XContentType.JSON, "name", "wangwu44", "age",60,"sex","男"));
        //request.add(new IndexRequest().index("user").id("1008").source(XContentType.JSON, "name", "wangwu555", "age",60,"sex","男"));
        request.add(new IndexRequest().index("user").id("1009").source(XContentType.JSON, "name", "wangwu66666", "age",60,"sex","男"));

        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
        System.out.println(response.getTook());
        System.out.println(response.getItems());

        esClient.close();
    }
}
2) 修改文档
package com.wt.test;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHost;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;

public class ESTest_Doc_Update {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 修改数据
        UpdateRequest request = new UpdateRequest();
        request.index("user").id("1001");
        request.doc(XContentType.JSON, "sex", "女");

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

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

        esClient.close();
    }
}
3) 查询文档
package com.wt.test;

import org.apache.http.HttpHost;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.util.Iterator;

public class ESTest_Doc_Search {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 1. 查询索引的所有数据
        SearchRequest request = new SearchRequest();
        request.indices("stu");

        // 构造查询条件
        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.query(QueryBuilders.matchAllQuery());

        request.source(builder);

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

        SearchHits hits = response.getHits();

        System.out.println(response.getTook());
        System.out.println(hits.getTotalHits());
        Iterator<SearchHit> iterator = hits.iterator();
        while (iterator.hasNext()) {
            SearchHit hit = iterator.next();
            System.out.println(hit.getSourceAsString());
        }

        esClient.close();
    }
}
4) 删除文档
package com.wt.test;

import org.apache.http.HttpHost;
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.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;

public class ESTest_Doc_Delete {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );


        DeleteRequest request = new DeleteRequest();
        request.index("shopping").id("A0001");

        DeleteResponse response = esClient.delete(request, RequestOptions.DEFAULT);
        System.out.println(response.toString());

        esClient.close();
    }
}

/*批量删除*/
package com.wt.test;

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.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;

public class ESTest_Doc_Delete_Batch {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 批量删除数据
        BulkRequest request = new BulkRequest();

        request.add(new DeleteRequest().index("user").id("1001"));
        request.add(new DeleteRequest().index("user").id("1002"));
        request.add(new DeleteRequest().index("user").id("1003"));

        BulkResponse response = esClient.bulk(request, RequestOptions.DEFAULT);
        System.out.println(response.getTook());
        System.out.println(response.getItems());

        esClient.close();
    }
}

2.2.5.5 高级查询

package com.wt.test;

import org.apache.http.HttpHost;
import org.apache.lucene.search.TotalHits;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.index.query.TermsQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;

public class ESTest_Doc_Query {
    public static void main(String[] args) throws Exception {

        RestHighLevelClient esClient = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );

        // 1. 查询索引中全部的数据
//        SearchRequest request = new SearchRequest();
//        request.indices("shopping");
//
//        request.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
//
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

        // 2. 条件查询 : termQuery
        SearchRequest request = new SearchRequest();
        request.indices("stu");

        request.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("age", 30)));
        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);

        SearchHits hits = response.getHits();

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

        for ( SearchHit hit : hits ) {
            System.out.println(hit.getSourceAsString());
        }

        // 3. 分页查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
//        // (当前页码-1)*每页显示数据条数
//        builder.from(2);
//        builder.size(2);
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 4. 查询排序
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
//        //
//        builder.sort("age", SortOrder.DESC);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 5. 过滤字段
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
//        //
//        String[] excludes = {"age"};
//        String[] includes = {};
//        builder.fetchSource(includes, excludes);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 6. 组合查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
//
//        //boolQueryBuilder.must(QueryBuilders.matchQuery("age", 30));
//        //boolQueryBuilder.must(QueryBuilders.matchQuery("sex", "男"));
//        //boolQueryBuilder.mustNot(QueryBuilders.matchQuery("sex", "男"));
//        boolQueryBuilder.should(QueryBuilders.matchQuery("age", 30));
//        boolQueryBuilder.should(QueryBuilders.matchQuery("age", 40));
//
//        builder.query(boolQueryBuilder);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 7. 范围查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
//
//        rangeQuery.gte(30);
//        rangeQuery.lt(50);
//
//        builder.query(rangeQuery);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

        // 8. 模糊查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//        builder.query(QueryBuilders.fuzzyQuery("name", "wangwu").fuzziness(Fuzziness.TWO));
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 9. 高亮查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//        TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("name", "zhangsan");
//
//        HighlightBuilder highlightBuilder = new HighlightBuilder();
//        highlightBuilder.preTags("<font color='red'>");
//        highlightBuilder.postTags("</font>");
//        highlightBuilder.field("name");
//
//        builder.highlighter(highlightBuilder);
//        builder.query(termsQueryBuilder);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

//        // 10. 聚合查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//
//        AggregationBuilder aggregationBuilder = AggregationBuilders.max("maxAge").field("age");
//        builder.aggregation(aggregationBuilder);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }

        // 11. 分组查询
//        SearchRequest request = new SearchRequest();
//        request.indices("user");
//
//        SearchSourceBuilder builder = new SearchSourceBuilder();
//
//        AggregationBuilder aggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
//        builder.aggregation(aggregationBuilder);
//
//        request.source(builder);
//        SearchResponse response = esClient.search(request, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//
//        System.out.println(hits.getTotalHits());
//        System.out.println(response.getTook());
//
//        for ( SearchHit hit : hits ) {
//            System.out.println(hit.getSourceAsString());
//        }



        esClient.close();
    }
}
posted @   a-tao必须奥利给  阅读(53)  评论(0)  编辑  收藏  举报
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