ElasticSearch教程——Java进行搜索

淡淡的烟草味﹌ 2021-09-27 11:28 384阅读 0赞

**ElasticSearch汇总请查看：[ElasticSearch教程——汇总篇][ElasticSearch]**

更多Java相关操作请移步：[ElasticSearch教程——Java常用操作][ElasticSearch_Java]

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    
    	<groupId>com.elasticsearch</groupId>
    	<artifactId>elasticSearch</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>jar</packaging>
    
    	<name>elasticSearch</name>
    	<description>Demo project for elasticsearch</description>
    
    	<parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.5.RELEASE</version>
    		<relativePath/> 
    	</parent>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    		<java.version>1.8</java.version>
    		<elsaticsearch.version>6.4.0</elsaticsearch.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    		    <groupId>org.elasticsearch.client</groupId>
    		    <artifactId>elasticsearch-rest-client</artifactId>
    		    <version>${elsaticsearch.version}</version>
    		</dependency>
    		<dependency>
    	        <groupId>org.elasticsearch.client</groupId>
    	        <artifactId>transport</artifactId>
    	        <version>${elsaticsearch.version}</version>
    		</dependency>
    		<dependency>
    	        <groupId>org.elasticsearch.plugin</groupId>
    	        <artifactId>transport-netty4-client</artifactId>
    	        <version>${elsaticsearch.version}</version>
    	   </dependency>
    		<dependency>
    		    <groupId>org.elasticsearch</groupId>
    		    <artifactId>elasticsearch</artifactId>
    		    <version>${elsaticsearch.version}</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.elasticsearch.client</groupId>
    		    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    		    <version>${elsaticsearch.version}</version>
    		    <type>pom</type>
    		</dependency>
    		<dependency>
    		    <groupId>commons-lang</groupId>
    		    <artifactId>commons-lang</artifactId>
    		    <version>2.6</version>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    </project>

HandleDocument.java

package com.gwd.elasticsearch.test;
    
    import java.net.InetAddress;
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.action.search.SearchType;
    import org.elasticsearch.client.transport.TransportClient;
    import org.elasticsearch.common.settings.Settings;
    import org.elasticsearch.common.transport.TransportAddress;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    import org.elasticsearch.search.SearchHits;
    import org.elasticsearch.transport.client.PreBuiltTransportClient;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    
    /**
     * Description:
     * 作者：gu.weidong(Jack)
     * date:2018年9月18日
     * ProjectName:elasticSearch
     */
    public class HandleDocument{
    	
    	private  TransportClient client = null;
    	
    	
    	@Test
    	public  void getResult() throws Exception{
    		SearchResponse response = client.prepareSearch("blog","index")//创建查询索引,参数productindex表示要查询的索引库为blog、index
    		        .setTypes("article")  //设置type
    		        .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)//设置查询类型 1.SearchType.DFS_QUERY_THEN_FETCH = 精确查询  2.SearchType.SCAN =扫描查询,无序
    		        .setQuery(QueryBuilders.termQuery("content", "today"))  //设置查询项以及对应的值
    	//	        .setPostFilter(QueryBuilders.rangeQuery("age").from(12).to(18))     // 设置Filter过滤
    		        .setFrom(0).setSize(60)//设置分页
    		        .setExplain(true) //设置是否按查询匹配度排序
    		//        .addSort("id", SortOrder.DESC)//设置按照id排序
    		        .execute()
    		        .actionGet();
    		SearchHits hits = response.getHits();
    		System.out.println("总数："+hits.getTotalHits());
    		for(SearchHit hit: hits.getHits()) {
    		    if(hit.getSourceAsMap().containsKey("title")) {
    		    	System.out.println("source.title: " + hit.getSourceAsMap().get("title"));
    		    }
    		}
    		System.out.println(response.toString());
    		closeClient();
    	}
    	
    	
    	
    	// 获取客户端
    	@Before
    	public   void getClient() throws Exception{
    		Settings settings = Settings.builder()
                    .put("cluster.name", "elasticsearch").build();
    		client =  new PreBuiltTransportClient(settings). addTransportAddress(new TransportAddress(InetAddress.getByName("XXX.XXX.XX.XX"), 9300));
    	}
    	
    	// 关闭客户端
    	@After
    	public  void closeClient(){
    		if (this.client != null){
    			this.client.close();
    		}
    	}
    	
    }

返回结果

总数：2
    source.title: New version of Elasticsearch released!
    source.title: New version of Elasticsearch released!
    {
    	"took": 7,
    	"timed_out": false,
    	"_shards": {
    		"total": 10,
    		"successful": 10,
    		"skipped": 0,
    		"failed": 0
    	},
    	"_clusters": {
    		"total": 0,
    		"successful": 0,
    		"skipped": 0
    	},
    	"hits": {
    		"total": 2,
    		"max_score": 0.61827284,
    		"hits": [{
    			"_shard": "[blog][1]",
    			"_node": "xDV-GTebTRqc7es0hDR4rQ",
    			"_index": "blog",
    			"_type": "article",
    			"_id": "eTmX5mUBtZGWutGW0TNs",
    			"_score": 0.61827284,
    			"_source": {
    				"title": "New version of Elasticsearch released!",
    				"content": "Version 1.0 released today!",
    				"priority": 10,
    				"tags": ["announce", "elasticsearch", "release"]
    			},
    			"_explanation": {
    				"value": 0.61827284,
    				"description": "weight(content:today in 0) [PerFieldSimilarity], result of:",
    				"details": [{
    					"value": 0.61827284,
    					"description": "score(doc=0,freq=1.0 = termFreq=1.0\n), product of:",
    					"details": [{
    						"value": 0.47000363,
    						"description": "idf, computed as log(1 + (docCount - docFreq + 0.5) / (docFreq + 0.5)) from:",
    						"details": [{
    							"value": 2.0,
    							"description": "docFreq",
    							"details": []
    						}, {
    							"value": 3.0,
    							"description": "docCount",
    							"details": []
    						}]
    					}, {
    						"value": 1.3154639,
    						"description": "tfNorm, computed as (freq * (k1 + 1)) / (freq + k1 * (1 - b + b * fieldLength / avgFieldLength)) from:",
    						"details": [{
    							"value": 1.0,
    							"description": "termFreq=1.0",
    							"details": []
    						}, {
    							"value": 1.2,
    							"description": "parameter k1",
    							"details": []
    						}, {
    							"value": 0.75,
    							"description": "parameter b",
    							"details": []
    						}, {
    							"value": 9.666667,
    							"description": "avgFieldLength",
    							"details": []
    						}, {
    							"value": 4.0,
    							"description": "fieldLength",
    							"details": []
    						}]
    					}]
    				}]
    			}
    		}, {
    			"_shard": "[blog][3]",
    			"_node": "xDV-GTebTRqc7es0hDR4rQ",
    			"_index": "blog",
    			"_type": "article",
    			"_id": "1",
    			"_score": 0.61827284,
    			"_source": {
    				"id": "1",
    				"title": "New version of Elasticsearch released!",
    				"content": "Version 1.0 released today!",
    				"priority": 10,
    				"tags": ["announce", "elasticsearch", "release"]
    			},
    			"_explanation": {
    				"value": 0.61827284,
    				"description": "weight(content:today in 0) [PerFieldSimilarity], result of:",
    				"details": [{
    					"value": 0.61827284,
    					"description": "score(doc=0,freq=1.0 = termFreq=1.0\n), product of:",
    					"details": [{
    						"value": 0.47000363,
    						"description": "idf, computed as log(1 + (docCount - docFreq + 0.5) / (docFreq + 0.5)) from:",
    						"details": [{
    							"value": 2.0,
    							"description": "docFreq",
    							"details": []
    						}, {
    							"value": 3.0,
    							"description": "docCount",
    							"details": []
    						}]
    					}, {
    						"value": 1.3154639,
    						"description": "tfNorm, computed as (freq * (k1 + 1)) / (freq + k1 * (1 - b + b * fieldLength / avgFieldLength)) from:",
    						"details": [{
    							"value": 1.0,
    							"description": "termFreq=1.0",
    							"details": []
    						}, {
    							"value": 1.2,
    							"description": "parameter k1",
    							"details": []
    						}, {
    							"value": 0.75,
    							"description": "parameter b",
    							"details": []
    						}, {
    							"value": 9.666667,
    							"description": "avgFieldLength",
    							"details": []
    						}, {
    							"value": 4.0,
    							"description": "fieldLength",
    							"details": []
    						}]
    					}]
    				}]
    			}
    		}]
    	}
    }

[ElasticSearch]: https://blog.csdn.net/gwd1154978352/article/details/82781731
[ElasticSearch_Java]: https://blog.csdn.net/gwd1154978352/article/details/82777273