SpringbootはelasticSearchとAPIの使用法を統合します

Mavenの依存関係

        <!-- elasticsearch -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

Springbootはバージョン6.8.5を使用します。
他のバージョンを指定する必要があります

初期化

@Configuration
public class ElasticSearchClientConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){
        return new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 9200, "http")));
    }
}

クラスターの場合は、次のコードを使用してください

@Configuration
public class ElasticSearchClientConfig {

    @Bean
    public RestHighLevelClient restHighLevelClient(){
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(
                        new HttpHost("localhost", 9200, "http"),
                        new HttpHost("localhost", 9201, "http")));
    }
}

インデックス関連のAPI

1. インデックスを作成する

public class EsTest{
    @Resource
    private RestHighLevelClient client;

    @Test
    public void testCreateIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("test_index");
        CreateIndexResponse response = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(response);
    }
}

2. インデックスが存在するかどうかを確認します

        GetIndexRequest request = new GetIndexRequest("test_index");
        boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);

3. インデックスを削除する

        DeleteIndexRequest request = new DeleteIndexRequest("test_index");
        client.indices().delete(request, RequestOptions.DEFAULT);

ドキュメント関連のAPI

1. ドキュメントを作成する

    @Test
    public void testCreateDocument() throws IOException {
        EsUser user = new EsUser("盖伦", 28, "我有一个大保健");
        IndexRequest request = new IndexRequest("index_test");

        request.source(JSON.toJSONString(user), XContentType.JSON);

        IndexResponse index = client.index(request, RequestOptions.DEFAULT);
        System.out.println(index.toString());;
    }

結果：

IndexResponse[index=index_test,type=_doc,id=DkfxKHcBDAil241A0UJ4,version=1,result=created,seqNo=9,primaryTerm=1,shards={"total":2,"successful":1,"failed":0}]

2. ドキュメントが存在するかどうかを確認します

    @Test
    public void testIsExitDocument() throws IOException {
    	// 索引库，文档id
        GetRequest request = new GetRequest("index_test", "DkfxKHcBDAil241A0UJ4");
        // 不获取_source上下文
        request.fetchSourceContext(new FetchSourceContext(false));
        boolean exists = client.exists(request, RequestOptions.DEFAULT);
        System.out.println(exists);
    }

3. ドキュメント情報を取得する

    @Test
    public void testSearchDocument() throws IOException {
        GetRequest request = new GetRequest("index_test", "DkfxKHcBDAil241A0UJ4");
        GetResponse response = client.get(request, RequestOptions.DEFAULT);
        System.out.println(response.getSourceAsString());
        System.out.println(response.toString());
    }

結果：

{"age":28,"desc":"我有一个大保健","name":"盖伦"}
{"_index":"index_test","_type":"_doc","_id":"DkfxKHcBDAil241A0UJ4","_version":1,"_seq_no":9,"_primary_term":1,"found":true,"_source":{"age":28,"desc":"我有一个大保健","name":"盖伦"}}

4. ドキュメントの削除と更新
   削除使用DeleteRequest
   更新使用UpdateRequest

5. バッチ処理

 @Test
    public void testESList() throws IOException {
        BulkRequest request = new BulkRequest();
        // 设置超时时间
        request.timeout(new TimeValue(10, TimeUnit.SECONDS));

        List<EsUser> userList = new ArrayList<>();
        userList.add(new EsUser("蛮王", 22, "我的光辉时刻实在开大招的时候"));
        userList.add(new EsUser("赵信", 40, "一点寒芒先至，随后抢出如龙"));
        userList.add(new EsUser("剑圣", 212, "啦啦啦啊"));
        userList.add(new EsUser("兔宝宝", 2, "我是一直兔宝宝"));

        for (int i = 0; i < userList.size(); i++) {
            request.add(
                    // 批量删除、修改 在这里修改对应的请求
                    new IndexRequest("index_test")
                            .id((i + 1) + "")
                            .source(JSON.toJSONString(userList.get(i)), XContentType.JSON));
        }

        BulkResponse responses = client.bulk(request, RequestOptions.DEFAULT);

        // 是否失败，返回false 代表执行成功
        boolean b = responses.hasFailures();
    }

6. お問い合わせ

    @Test
    public void testSearch() throws IOException {
        SearchRequest request = new SearchRequest("index_test");

        // 查询构建器
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        MatchQueryBuilder matchQuery = QueryBuilders.matchQuery("name", "赵信");
        searchSourceBuilder.query(matchQuery);
        searchSourceBuilder.timeout(new TimeValue(10, TimeUnit.SECONDS));
        request.source(searchSourceBuilder);

        SearchResponse search = client.search(request, RequestOptions.DEFAULT);

        System.out.println(JSON.toJSONString(search.getHits()));
        System.out.println("===================");
        for (SearchHit documentFields : search.getHits().getHits()) {
            System.out.println(documentFields.getSourceAsMap());
        }
    }