SpringBoot整合ES及简单API使用

1、pom文件导入ES依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.2</version>
</dependency>

2、编写配置,给容器中注入一个RestHighLevelClient

@Configuration
public class GulimallElasticSearchConfig {

    public static final RequestOptions COMMON_OPTIONS;

    static {
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
        COMMON_OPTIONS = builder.build();
    }

    @Bean
    public RestHighLevelClient esClient(){
        RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.146.129", 9200, "http"));
        return new RestHighLevelClient(builder);
    }
}

3、测试程序

@Test
    public void indexData() throws IOException {
        IndexRequest indexRequest = new IndexRequest("users");
        // 数据ID
        indexRequest.id("1");
        User user = new User();
        user.setUserName("zhangsan");
        user.setGender("male");
        user.setAge(20);
        String jsonString = JSON.toJSONString(user);
        indexRequest.source(jsonString, XContentType.JSON); // 要保存的内容

        // 使用客户端执行操作
        IndexResponse index = client.index(indexRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        System.out.println(index);
    }

4、查看ES,数据已存入到ES
在这里插入图片描述

5、带检索条件的查询

@Test
    public void searchData() throws IOException {
        // 1、创建检索请求
        SearchRequest searchRequest = new SearchRequest();
        // 2、指定索引
        searchRequest.indices("users");
        // 3、指定DSL,检索条件
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        // 够造检索条件
        sourceBuilder.query(QueryBuilders.matchQuery("userName", "zhangsan"));

        searchRequest.source(sourceBuilder);
        // 4、执行检索
        SearchResponse searchResponse = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
        System.out.println("---------> " + searchResponse);
    }

打印结果:

{
    "took": 5,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 0.2876821,
        "hits": [
            {
                "_index": "users",
                "_type": "_doc",
                "_id": "1",
                "_score": 0.2876821,
                "_source": {
                    "age": 20,
                    "gender": "male",
                    "userName": "zhangsan"
                }
            }
        ]
    }
}
SpringBoot整合Elasticsearch常用API主要包括以下几个方面: 1. 配置Elasticsearch信息 首先需要在application.yml中配置Elasticsearch的连接信息: ``` spring: data: elasticsearch: cluster-name: elasticsearch cluster-nodes: 127.0.0.1:9300 ``` 2. 创建ElasticsearchRepository 在SpringBoot中,可以通过ElasticsearchRepository来访问Elasticsearch,只需要继承该接口即可。 ``` public interface UserRepository extends ElasticsearchRepository<User, Long> { } ``` 其中,User是实体类,Long是主键类型。 3. 创建实体类 创建实体类,使用注解来映射Elasticsearch中的索引和字段。 ``` @Document(indexName = "user", type = "_doc") public class User { @Id private Long id; @Field(type = FieldType.Keyword) private String name; @Field(type = FieldType.Integer) private Integer age; // getter and setter } ``` 4. 增删改查 通过ElasticsearchRepository提供的方法,可以实现增删改查的操作。如下: ``` @Autowired UserRepository userRepository; // 新增 userRepository.save(user); // 删除 userRepository.deleteById(id); // 修改 userRepository.save(user); // 查询 Optional<User> optional = userRepository.findById(id); ``` 5. 搜索 Elasticsearch提供了丰富的搜索API,可以通过QueryBuilder来构建查询条件,通过SearchRequest来执行搜索操作。如下: ``` @Autowired RestHighLevelClient restHighLevelClient; // 构建查询条件 QueryBuilder queryBuilder = QueryBuilders.matchQuery("name", "张三"); // 构建SearchRequest SearchRequest searchRequest = new SearchRequest("user"); searchRequest.types("_doc"); SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); searchSourceBuilder.query(queryBuilder); searchRequest.source(searchSourceBuilder); // 执行搜索 SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); // 处理搜索结果 SearchHits hits = searchResponse.getHits(); for (SearchHit hit : hits) { String sourceAsString = hit.getSourceAsString(); User user = JSON.parseObject(sourceAsString, User.class); System.out.println(user); } ``` 以上就是SpringBoot整合Elasticsearch常用API的介绍。
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