ES相关的增删改查操作示例

依赖:

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
</dependency>

　　修改版本:

 

第一步:条件准备:首先是配置类:

@Configuration
public class EsConfig {

    @Bean
    public RestHighLevelClient client() {
        return new RestHighLevelClient(RestClient.builder(HttpHost.create(EsConstant.ES_URL)));
    }
}

　第二步:将我们需要创建的索引,以及文档,和字段

比如:

public interface EsConstant {
     //服务地址
    String ES_URL = "http://192.168.138.100:9200";
    //索引名称
    String HOTEL_INDEX = "hotel";
    //mapping映射
    String  HOTEL_MAPPING = "{\n" +
            "  \"mappings\": {\n" +
            "    \"properties\": {\n" +
            "      \"id\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"name\":{\n" +
            "        \"type\":\"text\",\n" +
            "        \"analyzer\": \"ik_smart\",\n" +
            "        \"copy_to\": \"all\"\n" +
            "      },\n" +
            "      \"address\":{\n" +
            "        \"type\": \"text\",\n" +
            "        \"analyzer\": \"ik_smart\",\n" +
            "        \"copy_to\": \"all\"\n" +
            "      },\n" +
            "    }\n" +
            "  }\n" +
            "}";
} 

　1.创建索引:(类似mysql创建数据表一样)

    void contextLoads() throws IOException {

        //执行创建索引对象，指定索引名
        CreateIndexRequest createindexrequest = new CreateIndexRequest(EsConstant.HOTEL_INDEX);

        //指定映射
        createindexrequest.source(EsConstant.HOTEL_MAPPING, XContentType.JSON);

        //创建索引
        CreateIndexResponse response = client.indices().create(createindexrequest, RequestOptions.DEFAULT);
        
    }

　　2.根据文档id查询文档内容:(类似mysql查询单个数据结果一样)

    public void getDocTest() throws IOException {
        //查询索引中的文档信息
        GetRequest getRequest = new GetRequest(EsConstant.HOTEL_INDEX, "36934");

        GetResponse response = client.get(getRequest, RequestOptions.DEFAULT);

        //将返回结果转成json字符串
        String source = response.getSourceAsString();
        //将json字符串转成查询对象
        HotelDoc hotelDoc = JSONObject.parseObject(source, HotelDoc.class);
    }

　　3.批量添加数据库中的内容到es索引

public void BanceAddTest() throws IOException {
        //从数据库获取数据集合
        List<Hotel> hotelList = hotelService.list();
        ArrayList<HotelDoc> list = new ArrayList<>();
        for (Hotel hotel : hotelList) {
            HotelDoc hotelDoc = new HotelDoc(hotel);
            list.add(hotelDoc);
        }

        BulkRequest bulkrequest = new BulkRequest();
        for (HotelDoc hotelDoc : list) {
            //创建请求对象并添加数据
            IndexRequest source = new IndexRequest(EsConstant.HOTEL_INDEX)
                    //获取文档id并转成字符串
                    .id(hotelDoc.getId().toString())
                    //将对象转成json字符串
                    .source(JSONObject.toJSONString(hotelDoc), XContentType.JSON);
            //添加文档对象
            bulkrequest.add(source);
        }
        //增加文档到索引中
        BulkResponse bulk = client.bulk(bulkrequest, RequestOptions.DEFAULT);
    }

　　以上就是关于索引常用的api示例.