Elasticsearch——java api构建搜索

版本

不同版本的elasticsearch-rest-high-level-client和 elasticsearch之间存在兼容风险，请确保和elasticsearch版本一致，否则会出现无法预计的错误。

es配置

maven依赖

<dependency>
	<groupId>org.elasticsearch.client</groupId>
	<artifactId>elasticsearch-rest-high-level-client</artifactId>
	<version>7.3.0</version>
	<exclusions>
		<exclusion>
			<groupId>org.elasticsearch</groupId>
			<artifactId>elasticsearch</artifactId>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupId>org.elasticsearch</groupId>
	<artifactId>elasticsearch</artifactId>
	<version>7.3.0</version>
</dependency>

配置application.properties

spring.application.name=service-search

#多个节点用逗号隔开
elasticsearch.hostlist=127.0.0.1:9200

创建配置类ElasticsearchConfig

@Configuration
public class ElasticsearchConfig {

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

    @Bean(destroyMethod = "close")
    public RestHighLevelClient restHighLevelClient(){
        String[] split = hostlist.split(",");
        HttpHost[] httpHost = new HttpHost[split.length];
        for (int i = 0; i < split.length; i++) {
            String[] item = split[i].split(":");
            httpHost[i] = new HttpHost(item[0],Integer.parseInt(item[1]),"http");
        }
        return new RestHighLevelClient(RestClient.builder(httpHost));
    }
}

搜索测试代码

搜索全部记录

GET /book/_search
{
  "query": {
    "match_all": {}
  }
}

@SpringBootTest(classes = SearchApplication.class)
@RunWith(SpringRunner.class)
@Slf4j
public class TestSearch {

    @Autowired
    private RestHighLevelClient client;

    //搜索全部记录
    @Test
    public void testSearchAll() throws IOException {
        //1、构建搜索请求
        SearchRequest searchRequest = new SearchRequest("book");

        //构建搜索的请求体
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.query(QueryBuilders.matchAllQuery());

        //获取某些字段
        searchSourceBuilder.fetchSource(new String[]{"name"},new String[]{});

        searchRequest.source(searchSourceBuilder);

        //2、执行
        SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

        //3、获取结果
        SearchHits searchHits = searchResponse.getHits();
        SearchHit[] hits = searchHits.getHits();
        for (SearchHit hit : hits) {
            String id = hit.getId();
            float score = hit.getScore();
            Map<String, Object> sourceAsMap = hit.getSourceAsMap();
            String name = (String)sourceAsMap.get("name");
            String description = (String)sourceAsMap.get("description");
            Double price = (Double)sourceAsMap.get("price");
            System.out.println("id: "+id);
            System.out.println("score: "+score);
            System.out.println("name: "+name);
            System.out.println("description: "+description);
            System.out.println("price: "+price);
            System.out.println("---------------------------------");
        }
    }
}

分页搜索

GET /book/_search
{
  "query": {
    "match_all": {}
  },
  "from": 0,
  "size": 2
}

@Test
public void testSearchPage() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	searchSourceBuilder.query(QueryBuilders.matchAllQuery());
	//设置分页
	int page = 1;//当前页
	int size = 2;//每页显示记录数
	int from  = (page - 1) * size;//每页起始记录数计算
	searchSourceBuilder.from(from).size(size);


	//获取某些字段
	searchSourceBuilder.fetchSource(new String[]{"name"},new String[]{});

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

ids搜索

GET /book/_search
{
  "query": {
    "ids" : {
      "values" : ["1", "4", "100"]
    }
  }
}

@Test
public void testSearchIds() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	searchSourceBuilder.query(QueryBuilders.idsQuery().addIds("1","4","100"));

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

按关键词搜索matchQuery

GET /book/_search
{
  "query" : {
    "match" : {
      "description" : "java程序员"
    }
  }
}

@Test
public void testSearchMatch() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	searchSourceBuilder.query(QueryBuilders.matchQuery("description","java程序员"));

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

multi_match搜索

GET /book/_search
{
  "query": {
    "multi_match": {
      "query": "java程序员",
      "fields": ["name", "description"]
    }
  }
}

@Test
public void testSearchMultiMatch() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	searchSourceBuilder.query(QueryBuilders.multiMatchQuery("java程序员","name","description"));

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

bool搜索

GET /book/_search
{
  "query": {
    "bool" : {
      "must" : [
        {
          "multi_match": {
            "query": "java程序员",
            "fields": ["name","description"]
          }
        }  
      ],
      "should" : [
        {
          "match": {
            "studymodel": "201001"
          }
        }
      ]
    }
  }
}

@Test
public void testSearchBool() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	//构建multi_match请求
	MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("java程序员", "name", "description");
	//构建match请求
	MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("studymodel", "201001");
	//构建bool请求
	BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
	boolQueryBuilder.must(multiMatchQueryBuilder);
	boolQueryBuilder.should(matchQueryBuilder);
	searchSourceBuilder.query(boolQueryBuilder);

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

filter搜索

GET /book/_search
{
  "query": {
    "bool" : {
      "must" : [
        {
          "multi_match": {
            "query": "java程序员",
            "fields": ["name","description"]
          }
        }  
      ],
      "should" : [
        {
          "match": {
            "studymodel": "201001"
          }
        }
      ],
      "filter": {
        "range": {
          "price": {
            "gte": 50,
            "lte": 90
          }
        }
      }
    }
  }
}

@Test
public void testSearchFilter() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	//构建multi_match请求
	MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("java程序员", "name", "description");
	//构建match请求
	MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("studymodel", "201001");
	//构建bool请求
	BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
	boolQueryBuilder.must(multiMatchQueryBuilder);
	boolQueryBuilder.should(matchQueryBuilder);
	boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(50).lte(90));
	searchSourceBuilder.query(boolQueryBuilder);

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}

sort搜索

GET /book/_search
{
  "query": {
    "bool" : {
      "must" : [
        {
          "multi_match": {
            "query": "java程序员",
            "fields": ["name","description"]
          }
        }  
      ],
      "should" : [
        {
          "match": {
            "studymodel": "201001"
          }
        }
      ],
      "filter": {
        "range": {
          "price": {
            "gte": 50,
            "lte": 90
          }
        }
      }
    }
  },
  "sort": [
    {
      "price": {
        "order": "asc"
      }
    }
  ] 
}

@Test
public void testSearchSort() throws IOException {
	//1、构建搜索请求
	SearchRequest searchRequest = new SearchRequest("book");

	//构建搜索的请求体
	SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
	//构建multi_match请求
	MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery("java程序员", "name", "description");
	//构建match请求
	MatchQueryBuilder matchQueryBuilder = QueryBuilders.matchQuery("studymodel", "201001");
	//构建bool请求
	BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
	boolQueryBuilder.must(multiMatchQueryBuilder);
	boolQueryBuilder.should(matchQueryBuilder);
	boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gte(50).lte(90));
	searchSourceBuilder.query(boolQueryBuilder);
	//按照价格字段升序排序
	searchSourceBuilder.sort("price", SortOrder.ASC);

	searchRequest.source(searchSourceBuilder);

	//2、执行
	SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

	//3、获取结果
	SearchHits searchHits = searchResponse.getHits();
	SearchHit[] hits = searchHits.getHits();
	for (SearchHit hit : hits) {
		String id = hit.getId();
		float score = hit.getScore();
		Map<String, Object> sourceAsMap = hit.getSourceAsMap();
		String name = (String)sourceAsMap.get("name");
		String description = (String)sourceAsMap.get("description");
		Double price = (Double)sourceAsMap.get("price");
		System.out.println("id: "+id);
		System.out.println("score: "+score);
		System.out.println("name: "+name);
		System.out.println("description: "+description);
		System.out.println("price: "+price);
		System.out.println("---------------------------------");
	}
}