RestClient操作文档

新增文档、查询文档、删除文档、修改文档

package cn.itcast.hotel;

import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.service.impl.HotelService;
import com.alibaba.fastjson.JSON;
import org.apache.http.HttpHost;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.io.IOException;
import java.util.List;

@SpringBootTest
public class ElasticsearchDocumentTest {

    private RestHighLevelClient client;
    @Autowired
    private HotelService service;
    @BeforeEach
    public void setUp(){
        this.client=new RestHighLevelClient(RestClient.builder(
                HttpHost.create("http://8.130.89.67:9200")
        )
        );
    }

    // TODO 添加数据
    @Test
    public void testIndexDocument() throws IOException {
        List list = service.list();
        for (Hotel hotel : list) {
            // 1.创建request对象
            IndexRequest request=new IndexRequest("hotel").id(hotel.getId().toString());
            HotelDoc hotelDoc=new HotelDoc(hotel);
            // 2.准备JSON文档
            request.source(JSON.toJSONString(hotelDoc), XContentType.JSON);
            // 3.发送请求
            client.index(request, RequestOptions.DEFAULT);
        }
    }

    // TODO 查询数据
    @Test
    public void testGetDocument() throws IOException {
        List list = service.list();
        for (Hotel hotel : list) {
            GetRequest request=new GetRequest("hotel",hotel.getId().toString());
            GetResponse response=client.get(request,RequestOptions.DEFAULT);
            String source = response.getSourceAsString();
            System.out.println(source);
        }

    }

//    TODO 修改数据
    @Test
    public void testUpdateDocument() throws IOException {
        // 1.创建request对象
        UpdateRequest request=new UpdateRequest("hotel","36934");
        request.doc(
                "city","下海"
        );
        // 2.删除文档
        client.update(request,RequestOptions.DEFAULT);
    }

//  TODO 删除数据
    @Test
    public void testDeleteDocument() throws IOException {
        DeleteRequest request=new DeleteRequest("hotel","36934");
        client.delete(request,RequestOptions.DEFAULT);
    }

    @AfterEach
    public void tearDown() throws IOException {
        this.client.close();
    }
}

询到的文档数据是json，需要反序列化为java对象。

局部更新。只更新部分字段

总结

        初始化RestHighLevelClient

        创建XxxRequest。XXX是Index、Get、Update、Delete

        准备参数（Index和Update时需要）插入和更新

        发送请求。调用RestHighLevelClient#.xxx()方法，xxx是index、get、update、delete

        解析结果（Get时需要

批量导入文档

//    TODO 批量添加数据
    @Test
    public void testListDocument() throws IOException {
        // 1.创建Bulk请求
        BulkRequest request=new BulkRequest();
        List hotels = service.list();
        for (Hotel hotel : hotels) {
            HotelDoc hotelDoc=new HotelDoc(hotel);
            // 2.添加要批量提交的请求：这里添加了两个新增文档的请求
            request
                    .add(new IndexRequest("hotel")
                            .id(hotelDoc.getId().toString())
                            .source(JSON.toJSONString(hotelDoc),XContentType.JSON));
        }
        // 3.发起bulk请求
        client.bulk(request,RequestOptions.DEFAULT);
    }