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Elasticsearch——Java API 操作

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

创建 Maven 项目

        我们在 IDEA 开发工具中创建 Maven 项目(模块也可)ES。并修改pom文件，增加Maven依赖关系。

#直接复制在pom文件的<dependencies></dependencies>中
<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>

        测试连接客户端，若控制台正常关闭无报错正常连接。

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();
    }
}

索引操作

        创建索引

public class ESTest_Index_Create {
    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"))
        );

        //创建索引
        CreateIndexRequest request = new CreateIndexRequest("user");
        CreateIndexResponse createIndexResponse = esClient.indices().create(request, RequestOptions.DEFAULT);
        //响应状态
        boolean acknowledged = createIndexResponse.isAcknowledged();
        //索引操作
        System.out.println("索引操作"+acknowledged);
        //关闭ES客户端
        esClient.close();
    }
}

        查询索引 

public class ESTest_Index_Search {
    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"))
        );

        //查询索引
        GetIndexRequest request = new GetIndexRequest("user");
        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());
        //关闭ES客户端
        esClient.close();
    }
}

        删除索引 

public class ESTest_Index_DELETE {
    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"))
        );

        //删除索引
        DeleteIndexRequest request = new DeleteIndexRequest("user");
        AcknowledgedResponse delete = esClient.indices().delete(request, RequestOptions.DEFAULT);
        //响应状态
        System.out.println("响应结果"+delete.isAcknowledged());
        //关闭ES客户端
        esClient.close();
    }
}

文档操作

        创建User类

public class User {

    private String name;
    private int age;
    private String sex;

    public User(String name, int age, String sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }
}

        新增数据

public class ESTest_Doc_Instert {
    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"))
        );

        //插入数据
        IndexRequest request = new IndexRequest();
        request.index("user").id("1001");

        User user = new User("zhangsan",30,"nan");

        //ES插入数据为JSON要将user转成JSON
        ObjectMapper objectMapper = new ObjectMapper();
        String s = objectMapper.writeValueAsString(user);
        request.source(s, XContentType.JSON);

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

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

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

        修改文档

public class ESTest_Doc_Update {
    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"))
        );

        //修改数据
        UpdateRequest request = new UpdateRequest();

        request.index("user").id("1001");
        request.doc(XContentType.JSON,"sex","女");

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

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

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

        查询数据

public class ESTest_Doc_Search {
    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"))
        );

       //查询数据
        GetRequest getRequest = new GetRequest();
        getRequest.index("user").id("1001");

        GetResponse index = esClient.get(getRequest, RequestOptions.DEFAULT);

        String sourceAsString = index.getSourceAsString();
        System.out.println(sourceAsString);
        //关闭ES客户端
        esClient.close();
    }
}

        文档删除

public class ESTest_Doc_Delete {
    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"))
        );

        //删除数据
        DeleteRequest request = new DeleteRequest();
        request.index("user").id("1001");

        User user = new User("zhangsan",30,"nan");



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

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

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

        批量新增

public class ESTest_Doc_Instert_Batch {
    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"))
        );

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

        bulkRequest.add(new IndexRequest().index("user").id("1001").source(XContentType.JSON, "name", "zhangsan"));
        bulkRequest.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON, "name", "lisi"));
        bulkRequest.add(new IndexRequest().index("user").id("1002").source(XContentType.JSON, "name", "wangwu"));

        BulkResponse bulk = esClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        System.out.println(bulk.getItems());
        System.out.println(bulk.getItems());
        //关闭ES客户端
        esClient.close();
    }
}

        批量删除 

public class ESTest_Doc_Delete_Batch {
    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"))
        );

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

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

        BulkResponse bulk = esClient.bulk(bulkRequest, RequestOptions.DEFAULT);

        System.out.println(bulk.getItems());
        System.out.println(bulk.getItems());
        //关闭ES客户端
        esClient.close();
    }
}

        高级查询&分页查询

package org.example.ES;

import org.apache.http.HttpHost;
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.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.common.unit.Fuzziness;
import org.elasticsearch.index.query.*;
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;

import javax.naming.directory.SearchResult;
import javax.swing.text.Highlighter;

public class ESTest_Doc_Query {
    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"))
        );

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

//        //条件查询 :termQuery
//        SearchRequest searchRequest = new SearchRequest();
//        searchRequest.indices("user");
//
//        searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("age",30)));
//        SearchResponse response = esClient.search(searchRequest, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//        System.out.println(hits.getTotalHits()+" "+ response.getTook());
//        for (SearchHit hit : hits){
//
//            System.out.println(hit.getSourceAsString());
//        }

        //分页查询
//        SearchRequest searchRequest = new SearchRequest();
//        searchRequest.indices("user");
//
//        SearchSourceBuilder query = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
//        query.from(0);
//        query.size(2);
//
//        searchRequest.source(query);
//        SearchResponse response = esClient.search(searchRequest, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//        System.out.println(hits.getTotalHits()+" "+ response.getTook());
//        for (SearchHit hit : hits){
//
//            System.out.println(hit.getSourceAsString());
//        }

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

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


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

        //范围查询
//        SearchRequest searchRequest = new SearchRequest();
//        searchRequest.indices("user");
//
//        SearchSourceBuilder query = new SearchSourceBuilder();
//        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
//
//        rangeQuery.gte(30);
//        rangeQuery.lte(40);
//
//        query.query(rangeQuery);
//
//        searchRequest.source(query);
//        SearchResponse response = esClient.search(searchRequest, RequestOptions.DEFAULT);
//
//        SearchHits hits = response.getHits();
//        System.out.println(hits.getTotalHits()+" "+ response.getTook());
//        for (SearchHit hit : hits){
//
//            System.out.println(hit.getSourceAsString());
//        }

        //模糊查询
//

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

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

        SearchSourceBuilder query = new SearchSourceBuilder();

        AggregationBuilder aggregationBuilder =   AggregationBuilders.terms("ageGrroup").field("age");

        query.aggregation(aggregationBuilder);

        query.query();

        searchRequest.source(query);
        SearchResponse response = esClient.search(searchRequest, RequestOptions.DEFAULT);

        SearchHits hits = response.getHits();
        System.out.println(hits.getTotalHits()+" "+ response.getTook());
        for (SearchHit hit : hits){

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


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

        全量查询

        条件查询

        分页查询

        排序查询

        只查姓名

        排除年龄

        多条件查询

        范围查询

        模糊查询

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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