Elasticsearch的api使用

Posted 2023-02-02

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本篇文章主要介绍Elasticsearch的java原生api使用。es的下载链接

解压启动window版本的es

https://www.elastic.co/cn/downloads/elasticsearch

我使用的是es的windows版本，解压后，直接双击elasticsearch.bat，启动es。

Elasticsearch的api使用_java

到浏览器，输入网址 http://localhost:9200/ 出现一下界面则说明启动成功。

Elasticsearch的api使用_elasticsearch_02

没啥好说导入依赖

<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>

    </dependencies>

创建索引

public static void main(String[] args) throws IOException 
       
            // 创建客户端对象
            RestHighLevelClient client = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost", 9200, "http"))
            );
            CreateIndexRequest user = new CreateIndexRequest("china_phone");
            CreateIndexResponse response = client.indices().create(user, RequestOptions.DEFAULT);
            boolean life = response.isAcknowledged();
            System.out.println(life);
      
       // 关闭客户端连接.
            client.close();

使用postman指定索引的格式

localhost:9200/china_phone/_mapping


 "properties":
        "title":
            "type":"keyword",
             "index":"true"
        ,
        "category":
           "type":"keyword",
           "index":"true"
        ,
        "images":
          "type":"text",
           "index":"false"
 ,
    "price":
        "type":"float",
           "index":"true"

Elasticsearch的api使用_客户端_03

按id查询

package com.example.FristPackage;

import org.apache.http.HttpHost;
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;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.client.indices.GetIndexResponse;

import java.io.IOException;

public class Get_Info 
    public static void main(String[] args) throws IOException 
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        //1.创建请求对象
        GetRequest request = new GetRequest().index("china_phone").id("1025");
//2.客户端发送请求，获取响应对象
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
3.打印结果信息
        System.out.println("_index:" + response.getIndex());
        System.out.println("_type:" + response.getType());
        System.out.println("_id:" + response.getId());
        System.out.println("source:" + response.getSourceAsString());
        client.close();

批量增加

package com.example.FristPackage;

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.delete.DeleteResponse;
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;

import java.io.IOException;

public class Batch_Add 
    public static void main(String[] args) throws IOException 
        // 创建客户端对象
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        //创建批量新增请求对象
        BulkRequest request = new BulkRequest();
        request.add(new
                IndexRequest().index("china_phone").id("1025").source(XContentType.JSON, "title",
                "华为", "category", "mate9", "images", "http://www.gulixueyuan.com/xm.jpg", "price", "999.0"));
        request.add(new
                IndexRequest().index("china_phone").id("1026").source(XContentType.JSON, "title",
                "华为", "category", "mate10", "images", "http://www.gulixueyuan.com/xm.jpg", "price", "1999.0"));
        request.add(new
                IndexRequest().index("china_phone").id("1027").source(XContentType.JSON, "title",
                "华为", "category", "mate20", "images", "http://www.gulixueyuan.com/xm.jpg", "price", "3999.0"));
        request.add(new
                IndexRequest().index("china_phone").id("1028").source(XContentType.JSON, "title",
                "华为", "category", "mate20pro", "images", "http://www.gulixueyuan.com/xm.jpg", "price", "4999.0"));
        //客户端发送请求，获取响应对象
        BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);
//打印结果信息
        System.out.println("took:" + responses.getTook());
        System.out.println("items:" + responses.getItems());
        client.close();

更新内容

package com.example.FristPackage;

import org.apache.http.HttpHost;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
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;

import java.io.IOException;

public class Update_Info 
    public static void main(String[] args) throws IOException 
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        //1.创建请求对象
        // 修改文档 - 请求对象
        UpdateRequest request = new UpdateRequest();
// 配置修改参数
        request.index("china_phone").id("1025");
// 设置请求体，对数据进行修改
        request.doc(XContentType.JSON, "title", "魅族手机");
// 客户端发送请求，获取响应对象
        UpdateResponse response = client.update(request, RequestOptions.DEFAULT);
        System.out.println("_index:" + response.getIndex());
        System.out.println("_id:" + response.getId());
        System.out.println("_result:" + response.getResult());


        GetRequest requests = new GetRequest().index("shopping").id("1005");
//2.客户端发送请求，获取响应对象
        GetResponse responses = client.get(requests, RequestOptions.DEFAULT);
3.打印结果信息
        System.out.println("_index:" + response.getIndex());
        System.out.println("_type:" + response.getType());
        System.out.println("_id:" + response.getId());
        System.out.println("source:" + responses.getSourceAsString());
        client.close();

遍历文档

package com.example.FristPackage;

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.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;

public class Bath_Print 
    public static void main(String[] args) throws IOException 
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 创建搜索请求对象
        SearchRequest request = new SearchRequest();
        request.indices("china_phone");
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
// 查询所有数据
        sourceBuilder.query(QueryBuilders.matchAllQuery());
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 查询匹配
        SearchHits hits = response.getHits();
        System.out.println("took:" + response.getTook());
        System.out.println("timeout:" + response.isTimedOut());
        System.out.println("total:" + hits.getTotalHits());
        System.out.println("MaxScore:" + hits.getMaxScore());
        System.out.println("hits========>>");
        for (SearchHit hit : hits) 
//输出每条查询的结果信息
            System.out.println(hit.getSourceAsString());
        
        System.out.println("<<========");
        client.close();

按id删除

package com.example.FristPackage;

import org.apache.http.HttpHost;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.support.master.AcknowledgedRequest;
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;

import java.io.IOException;

public class delte_index 
    public static void main(String[] args) throws IOException 
        // 创建客户端对象
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        //创建请求对象
        DeleteRequest request = new DeleteRequest().index("china_phone").id("1025");
//客户端发送请求，获取响应对象
        DeleteResponse response = client.delete(request, RequestOptions.DEFAULT);
//打印信息
        System.out.println(response.toString());


// 关闭客户端连接.
        client.close();

批量删除

package com.example.FristPackage;

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;

import java.io.IOException;

public class Batch_Delete 
    public static void main(String[] args) throws IOException 
        // 创建客户端对象
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        //创建批量删除请求对象
        BulkRequest request = new BulkRequest();
        request.add(new DeleteRequest().index("china_phone").id("1025"));
        request.add(new DeleteRequest().index("china_phone").id("1026"));

//客户端发送请求，获取响应对象
        BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);
//打印结果信息
        System.out.println("took:" + responses.getTook());
        System.out.println("items:" + responses.getItems());
//打印结果信息
        System.out.println("took:" + responses.getTook());
        System.out.println("items:" + responses.getItems());
        client.close();

过滤

package com.example.FristPackage;

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.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;

import java.io.IOException;

public class Findexactly 
    public static void main(String[] args) throws IOException 
        // 创建客户端对象
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 创建搜索请求对象
        SearchRequest request = new SearchRequest();
        request.indices("china_phone");
// 构建查询的请求体
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.termQuery( "title",
                "华为"));
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 查询匹配
        SearchHits hits = response.getHits();
        System.out.println("took:" + response.getTook());
        System.out.println("timeout:" + response.isTimedOut());
        System.out.println("total:" + hits.getTotalHits());
        System.out.println("MaxScore:" + hits.getMaxScore());
        System.out.println("hits========>>");
        for (SearchHit hit : hits) 
//输出每条查询的结果信息
            System.out.println("数据为： "+hit.getSourceAsString());
        
        System.out.println("<<========");
        client.close();

自拟定降序和过滤规则

package com.example.FristPackage;

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.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;

import java.io.IOException;

public class Sort_And_Filter 
    public static void main(String[] args) throws IOException 
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 创建搜索请求对象
        SearchRequest request = new SearchRequest();
        request.indices("china_phone");
        // 构建查询的请求体
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.termQuery( "title","华为"
                ));
        // 排序
        sourceBuilder.sort("price", SortOrder.DESC);
        RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("price");
        // 大于等于
        rangeQuery.gte("1000");
        // 小于等于
        rangeQuery.lte("5000");
        sourceBuilder.query(rangeQuery);
        request.source(sourceBuilder);
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);
// 查询匹配
        SearchHits hits = response.getHits();
        System.out.println("took:" + response.getTook());
        System.out.println("timeout:" + response.isTimedOut());
        System.out.println("total:" + hits.getTotalHits());
        System.out.println("MaxScore:" + hits.getMaxScore());
        System.out.println("hits========>>");
        for (SearchHit hit : hits) 
//输出每条查询的结果信息
            System.out.println(hit.getSourceAsString());
        
        System.out.println("<<========");
        client.close();

实体类映射

package com.example.FristPackage;

public class Phone 
    private String title;
    private String category;
    private String images;
    private Double price;

    public String getTitle() 
        return title;
    

    @Override
    public String toString() 
        return "Phone" +
                "title=" + title + \\ +
                ", category=" + category + \\ +
                ", images=" + images + \\ +
                ", price=" + price +
                ;
    

    public void setTitle(String title) 
        this.title = title;
    

    public String getCategory() 
        return category;
    

    public void setCategory(String category) 
        this.category = category;
    

    public String getImages() 
        return images;
    

    public void setImages(String images) 
        this.images = images;
    

    public Double getPrice() 
        return price;
    

    public void setPrice(Double price) 
        this.price = price;

package com.example.FristPackage;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpHost;
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.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;

import java.io.IOException;

public class Mapper 
    public static void main(String[] args) throws IOException 
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http"))
        );
        // 新增文档 - 请求对象
        IndexRequest request = new IndexRequest();
        // 设置索引及唯一性标识
        request.index("china_phone").id("1045");
// 创建数据对象
        Phone phone=new Phone();
        phone.setCategory("k10");
        phone.setTitle("红米");
        phone.setImages("http://www.gulixueyuan.com/xm.jpg");
        phone.setPrice(2945.5);
        ObjectMapper objectMapper = new ObjectMapper();
        String productJson = objectMapper.writeValueAsString(phone);
// 添加文档数据，数据格式为 JSON 格式
        request.source(productJson, XContentType.JSON);
// 客户端发送请求，获取响应对象
        IndexResponse response = client.index(request, RequestOptions.DEFAULT);
3.打印结果信息
        System.out.println("_index:" + response.getIndex());
        System.out.println("_id:" + response.getId());
        System.out.println("_result:" + response.getResult());

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