ElasticSearch-4 ES7 RestHighLeve

ElasticSearch-1 ES基础概念及命令操作

ElasticSearch-2 ES6 TransportClient + SpringBoot2 增删改查

ElasticSearch-3 ES6 TransportClient 实现全文检索

ElasticSearch-4 ES7 RestHighLevelClient + SpringBoot2 增删改查

ElasticSearch-5 ES7 RestHighLevelClient 实现仿京东搜索

绝地求生 PUBG追逐4k壁纸_彼岸图网.jpg

    <properties>
        <elasticsearch.version>7.6.2</elasticsearch.version>
    </properties>

        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.6.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

• 配置类

@Configuration
public class ElasticSearchConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){

        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 9200, "http")));
        return client;
    }
}

• java bean

@Data
@NoArgsConstructor
@AllArgsConstructor
@Component
public class User {
    private String name;
    private int age;
}

• 基本操作的测试方法

@SpringBootTest
class ElasticsearchApplicationTests {

    ObjectMapper objectMapper = new ObjectMapper();

    @Autowired
    @Qualifier("restHighLevelClient")
    private RestHighLevelClient client;

    @Test
        // 1、创建索引
    void testCreateIndex() throws IOException {

        // 创建索引请求
        CreateIndexRequest request = new CreateIndexRequest("test_index");
        // 客户端执行：创建索引的请求
        CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);

        System.out.println("索引: " + createIndexResponse);
    }

    @Test
        // 2、判断索引是否存在
    void testExistIndex() throws IOException {
        GetIndexRequest request = new GetIndexRequest("test_index");
        boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);

        System.out.println(exists);
    }

    @Test
        // 3、删除索引
    void testDeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("test_index");
        AcknowledgedResponse response = client.indices().delete(request, RequestOptions.DEFAULT);

        System.out.println(response);
    }

    @Test
        // 1、测试添加一个文档
    void testAddDocument() throws IOException {

        User user = new User("陆", 19);

        String userJson = objectMapper.writeValueAsString(user);


        IndexRequest request = new IndexRequest("person");
        request.source(userJson, XContentType.JSON);
        IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);

        System.out.println(indexResponse);
    }

    @Test
        // 2、测试获取文档：判断是否存在指定的文档
    void tesIsExists() throws IOException {
        GetRequest Request = new GetRequest("person", "fswRhnEBWRRkPpZFKbAZ");
        boolean exists = client.exists(Request, RequestOptions.DEFAULT);
        System.out.println("是否存在：" + exists);
    }

    @Test
        // 3、获取一个文档信息
    void testGetDocument() throws IOException {
        GetRequest Request = new GetRequest("person", "fswRhnEBWRRkPpZFKbAZ");
        GetResponse documentFields = client.get(Request, RequestOptions.DEFAULT);

        System.out.println(documentFields); // {"_index":"person","_type":"_doc","_id":"fswRhnEBWRRkPpZFKbAZ","_version":1,"_seq_no":0,"_primary_term":1,"found":true,"_source":{"name":"谢","age":20}}
        System.out.println(documentFields.getSourceAsString()); // {"name":"谢","age":20}
    }

    @Test
        // 4、更新一个文档信息
    void updateDocument() throws IOException {
        UpdateRequest updateRequest = new UpdateRequest("person", "fswRhnEBWRRkPpZFKbAZ");
        User user = new User("谢谢", 21);
        updateRequest.doc(objectMapper.writeValueAsString(user), XContentType.JSON);
        UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT);
    }

    @Test
        // 5、删除一个文档
    void deleteDocument() throws IOException {
        DeleteRequest deleteRequest = new DeleteRequest("person", "fswRhnEBWRRkPpZFKbAZ");
        DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);

        System.out.println(deleteResponse);
        System.out.println(deleteResponse.status());  //
    }

    @Test
        // 6、批量操作，这里只演示批量插入
    void bulkInsert() throws IOException {
        ArrayList<Object> userList = new ArrayList<>();
        userList.add(new User("谢1", 19));
        userList.add(new User("谢2", 19));
        userList.add(new User("谢3", 19));

        BulkRequest bulkRequest = new BulkRequest();
        bulkRequest.timeout("10s");

        for (int i = 0; i < userList.size(); i++) {
            bulkRequest.add(new IndexRequest("person").source(objectMapper.writeValueAsString(userList.get(i)), XContentType.JSON));
        }
        BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT);
        System.out.println(bulkResponse.hasFailures());  // 是否失败，false代表成功
    }

    @Test
        // 查询
    void testSearch() throws IOException {
        SearchRequest searchRequest = new SearchRequest("person");

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        // 精确查询
        //TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "陆");
        //sourceBuilder.query(termQueryBuilder);

        // 查询所有
        MatchAllQueryBuilder allQueryBuilder = QueryBuilders.matchAllQuery();
        sourceBuilder.query(allQueryBuilder);

        searchRequest.source(sourceBuilder);

        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        System.out.println(objectMapper.writeValueAsString(searchResponse.getHits()));
        System.out.println("========================");
        for (SearchHit hit : searchResponse.getHits().getHits()) {
            System.out.println(hit.getSourceAsMap());
        }

    }
}