目录

例：利用JavaRestClient实现创建、删除索引库，判断索引库是否存在

1、编写mapping映射

2、初始化JavaRestClient

（1）导入elasticsearch的依赖

（2）修改elasticsearch的版本

（3）初始化RestHighLevelClient

3、创建索引库

（1）编写代码

（2）创建常量类，将mapping映射作为常量导入

（3）运行测试

4、删除索引库

5、查询索引库是否存在

---

例：利用JavaRestClient实现创建、删除索引库，判断索引库是否存在

1、编写mapping映射

PUT /hotel
{
  "mappings": {
    "properties": {
      "id": {
        "type": "keyword"
      },
      "name":{
        "type": "text",
        "analyzer": "ik_max_word",
        "copy_to": "all"
      },
      "address":{
        "type": "keyword",
        "index": false
      },
      "price":{
        "type": "integer"
      },
      "score":{
        "type": "integer"
      },
      "brand":{
        "type": "keyword",
        "copy_to": "all"
        
      },
      "city":{
        "type": "keyword"
      },
      "starName":{
        "type": "keyword"
      },
      "business":{
        "type": "keyword",
        "copy_to": "all"
      },
      "location":{
        "type": "geo_point"
      },
      "pic":{
        "type": "keyword",
        "index": false
      },
      "all":{
        "type": "text",
        "analyzer": "ik_max_word"
      }
    }
  }
}

2、初始化JavaRestClient

（1）导入elasticsearch的依赖

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

（2）修改elasticsearch的版本

    <properties>
        <java.version>1.8</java.version>
        <elasticsearch.version>7.12.1</elasticsearch.version>
    </properties>

（3）初始化RestHighLevelClient

新建测试类并编写代码

public class HotelIndexTest {
    private RestHighLevelClient client;

    @Test
    void testInit(){
        System.out.println(client);
    }

    @BeforeEach
    void setUp(){
        this.client = new RestHighLevelClient(RestClient.builder(
                HttpHost.create("http://192.168.248.152:9200")
        ));
    }

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

3、创建索引库

（1）编写代码

public class HotelIndexTest {
    private RestHighLevelClient client;

    @Test
    void testInit(){
        System.out.println(client);
    }

    @BeforeEach
    void setUp(){
        this.client = new RestHighLevelClient(RestClient.builder(
                HttpHost.create("http://192.168.248.152:9200")
        ));
    }

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

    @Test
    void createHotelIndex() throws IOException {
//        创建request对象
        CreateIndexRequest request = new CreateIndexRequest("hotel");
//        准备请求参数
        request.source(MAPPING, XContentType.JSON);
//        发送请求
        client.indices().create(request, RequestOptions.DEFAULT);
    }


}

（2）创建常量类，将mapping映射作为常量导入

public class HotelConstans {
    public static final String MAPPING =
            "{\n" +
            "  \"mappings\": {\n" +
            "    \"properties\": {\n" +
            "      \"id\": {\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"name\":{\n" +
            "        \"type\": \"text\",\n" +
            "        \"analyzer\": \"ik_max_word\",\n" +
            "        \"copy_to\": \"all\"\n" +
            "      },\n" +
            "      \"address\":{\n" +
            "        \"type\": \"keyword\",\n" +
            "        \"index\": false\n" +
            "      },\n" +
            "      \"price\":{\n" +
            "        \"type\": \"integer\"\n" +
            "      },\n" +
            "      \"score\":{\n" +
            "        \"type\": \"integer\"\n" +
            "      },\n" +
            "      \"brand\":{\n" +
            "        \"type\": \"keyword\",\n" +
            "        \"copy_to\": \"all\"\n" +
            "        \n" +
            "      },\n" +
            "      \"city\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"starName\":{\n" +
            "        \"type\": \"keyword\"\n" +
            "      },\n" +
            "      \"business\":{\n" +
            "        \"type\": \"keyword\",\n" +
            "        \"copy_to\": \"all\"\n" +
            "      },\n" +
            "      \"location\":{\n" +
            "        \"type\": \"geo_point\"\n" +
            "      },\n" +
            "      \"pic\":{\n" +
            "        \"type\": \"keyword\",\n" +
            "        \"index\": false\n" +
            "      },\n" +
            "      \"all\":{\n" +
            "        \"type\": \"text\",\n" +
            "        \"analyzer\": \"ik_max_word\"\n" +
            "      }\n" +
            "    }\n" +
            "  }\n" +
            "}";
}

（3）运行测试

4、删除索引库

    @Test
    void deleteHotelIndex() throws IOException {
//        创建request对象
        DeleteIndexRequest request = new DeleteIndexRequest("hotel");
//        发送请求
        client.indices().delete(request, RequestOptions.DEFAULT);
    }

5、查询索引库是否存在

    @Test
    void existsHotelIndex() throws IOException {
//        创建request对象
        GetIndexRequest request = new GetIndexRequest("hotel");
//        发送请求
        boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);

        System.out.println(exists ? "已经存在":"不存在");
    }