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springboot中使用elasticsearch客户端RestClient

创建springboot项目配置pom.xml

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <version>2.2.3.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.3.0</version>
</dependency>

配置application.yml

testelasticsearch:
  elasticsearch:
    hostlist: 192.168.247.130:9200 #多个结点用逗号分隔

向spring容器中注入RestHighLevelClient

@Configuration
public class ElasticsearchConfig {

    @Value("${testelasticsearch.elasticsearch.hostlist}")
    private String hostlist;

    @Bean
    public RestHighLevelClient restHighLevelClient() {
        //获得配置的ip:port的数组
        String[] split = hostlist.split(",");
        HttpHost[] httpHostArray = new HttpHost[split.length];
        for (int i = 0; i < split.length; i++) {
            String item = split[i];
            //获得ip和端口
            String[] ipAndPort = item.split(":");
            httpHostArray[i] = new HttpHost(ipAndPort[0],Integer.parseInt(ipAndPort[1]), "http");
        }
        return new RestHighLevelClient(RestClient.builder(httpHostArray));
    }
}

创建测试类并执行

创建索引

@SpringBootTest
@RunWith(SpringRunner.class)
public class TestElasticsearchClient {
    @Autowired
    RestHighLevelClient client;

    @Test
    public void testCreateIndex() throws IOException {
        //创建索引的请求对象
        CreateIndexRequest createIndexRequest = new CreateIndexRequest("elasticsearch_test");
        //设置分片和副本的参数
        createIndexRequest.settings(Settings.builder()
                .put("number_of_shards", "1")
                .put("number_of_replicas", "0"));
//        在kibana中创建索引库的dsl写法
//         PUT /elasticsearch_test
//        {
//            "settings": {},
//            "mappings": {
//                "properties": {
//                    "description": {
//                        "type": "text",
//                        "analyzer": "ik_max_word"
//                    },
//                    "name": {
//                        "type": "keyword"
//                    },
//                    "pic": {
//                        "type": "text",
//                        "index": false
//                    },
//                    "studymodel": {
//                        "type": "keyword"
//                    }
//                }
//            }
//        }
// 			创建mapping映射
        XContentBuilder builder = XContentFactory.jsonBuilder()
                //startObject是大括号的{，endObject是大括号的}
                .startObject()
                .field("properties")
                    .startObject()
                    .field("studymodel").
                        startObject().
                        field("index","true").
                        field("type", "keyword").
                        endObject()
                    .field("name").
                        startObject().
                        field("index","true").
                        field("type", "text").
                        endObject()
                    .field("description").
                        startObject().
                        field("index","true").
                        field("type", "text").
                        field("analyzer", "ik_max_word").
                        endObject()
                    .field("pic").
                        startObject().
                        field("index","false").
                        field("type", "text").
                        endObject()
                    .endObject()
                .endObject();
        createIndexRequest.mapping("doc", builder);

        //操作索引的客户端
        IndicesClient indices = client.indices();
        //执行创建索引库
        CreateIndexResponse createIndexResponse = indices.create(createIndexRequest,RequestOptions.DEFAULT);
        //得到响应
        boolean acknowledged = createIndexResponse.isAcknowledged();
        System.out.println(acknowledged);
    }
}

在kibana查看索引库
在这里插入图片描述

删除索引

创建删除索引的测试方法

	@Test
    public void testDeleteIndex() throws IOException {
        //创建删除索引的请求对象
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("elasticsearch_test");
        //操作索引的客户端
        IndicesClient indices = client.indices();
        //执行删除索引
        AcknowledgedResponse delete = indices.delete(deleteIndexRequest,RequestOptions.DEFAULT); 
        //得到响应
        boolean acknowledged = delete.isAcknowledged();
        System.out.println(acknowledged);
    }

在kibana查询
在这里插入图片描述

插入文档

	@Test
    public void testAddDoc() throws IOException {
        //创建索引请求对象
        IndexRequest indexRequest = new IndexRequest("elasticsearch_test");
        //绑定id
        indexRequest.id("1");
        //文档内容 准备json数据
        Map<String, Object> jsonMap = new HashMap<>();
        jsonMap.put("name", "es搜索");
        jsonMap.put("description", "啊啊啊啊测试一下这个插入");
        jsonMap.put("studymodel", "201001");
        //插入小数类型
        jsonMap.put("price", 8.8f);
        indexRequest.source(jsonMap);
        //通过client进行http的请求
        IndexResponse indexResponse = client.index(indexRequest,RequestOptions.DEFAULT);
        DocWriteResponse.Result result = indexResponse.getResult();
        System.out.println(result);
    }

查看一下
在这里插入图片描述

用id查询文档

    @Test
    public void testGetDoc() throws IOException {
        //查询请求对象
        GetRequest getRequest = new GetRequest("elasticsearch_test","1");
        GetResponse getResponse = client.get(getRequest,RequestOptions.DEFAULT);
        //得到文档的内容
        Map<String, Object> sourceAsMap = getResponse.getSourceAsMap();
        System.out.println(sourceAsMap);
    }

在这里插入图片描述

查询全部

	@Test
    public void testSearch() throws IOException{ //搜索请求对象
        SearchRequest searchRequest = new SearchRequest("elasticsearch_test");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //搜索全部
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //termQuery
        //searchSourceBuilder.query(QueryBuilders.termQuery("name","es"));
        // 设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name","studymodel","price","timestamp"},new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder); //执行搜索,向ES发起http请求
        SearchResponse searchResponse = client.search(searchRequest,RequestOptions.DEFAULT);
        //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        TotalHits totalHits = hits.getTotalHits();
        //通过hits得到文档
        SearchHit[] searchHits = hits.getHits();
        for(SearchHit hit:searchHits){
            //文档的主键
            String id = hit.getId();
            //源文档内容
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String name = (String) sourceAsMap.get("name");
            //由于前边设置了源文档字段过虑，这里description是null
            String description = (String) sourceAsMap.get("description");
            String studymodel = (String) sourceAsMap.get("studymodel");
            Double price = (Double) sourceAsMap.get("price");
            System.out.println(name);
            System.out.println(studymodel);
            System.out.println(description);
            System.out.println(price);
        }
    }

查看结果
在这里插入图片描述

termQuery查询

//把上面的
searchSourceBuilder.query(QueryBuilders.matchAllQuery());
//根据查询条件替换
searchSourceBuilder.query(QueryBuilders.termQuery("name","es"));

分页排序

设置起始页，size和排序方式
searchSourceBuilder.from(from);
searchSourceBuilder.size(size);
searchSourceBuilder.query(QueryBuilders.termQuery(“name”,“spring”));

    @Test
    public void testSearchByPage() throws IOException {
        //搜索请求对象
        SearchRequest searchRequest = new SearchRequest("elasticsearch_test");
        //搜索源构建对象
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //页码
        int page = 1;
        //每页记录数
        int size = 2;
        //计算出记录起始下标
        int from = (page - 1) * size;
        //起始记录下标，从0开始
        searchSourceBuilder.from(from);
        // 每页显示的记录数
        searchSourceBuilder.size(size);
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());
        //设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
        searchSourceBuilder.fetchSource(new String[]{"name", "studymodel", "price", "timestamp"}, new String[]{});
        //向搜索请求对象中设置搜索源
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); //搜索结果
        SearchHits hits = searchResponse.getHits();
        //匹配到的总记录数
        TotalHits totalHits = hits.getTotalHits();
        SearchHit[] searchHits = hits.getHits();
        for (SearchHit hit : searchHits) {
            //文档的主键
            String id = hit.getId();
            //源文档内容
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String name = (String) sourceAsMap.get("name");
            //由于前边设置了源文档字段过虑，这时description是取不到的
            String description = (String) sourceAsMap.get("description");
            //学习模式
            String studymodel = (String) sourceAsMap.get("studymodel");
            //价格
            Double price = (Double) sourceAsMap.get("price");
            System.out.println(name);
            System.out.println(studymodel);
            System.out.println(description);
            System.out.println(price);
        }
    }