依赖
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.hhy</groupId>
<artifactId>elasticsearch</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>elasticsearch</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<!--2.3.x默认elasticsearch的版本7.6.2,需要与我们自己的版本一致-->
<elasticsearch.version>7.8.1</elasticsearch.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.73</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
配置类
@Configuration
public class ElasticSearchConfig {
@Bean
public RestHighLevelClient restHighLevelClient() {
return new RestHighLevelClient(
RestClient.builder(
new HttpHost("127.0.0.1",9200,"http")));
}
}
实体类
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private String name;
private Integer age;
private LocalDate birthday;
private String[] hobby;
}
测试链接
@SpringBootTest
class ElasticsearchApplicationTests {
@Autowired
private RestHighLevelClient restHighLevelClient;
//索引的创建
@Test
public void createIndex(){
try {
//创建索引请求
CreateIndexRequest request = new CreateIndexRequest("testIndex");
//客户端执行请求
CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
System.out.println(createIndexResponse);
} catch (IOException e) {
e.printStackTrace();
}
}
}
报错
[testIndex] ElasticsearchStatusException[Elasticsearch exception [type=invalid_index_name_exception, reason=Invalid index name [testIndex], must be lowercase]
]
解决
索引必须是小写
常用API使用
package com.hhy.elasticsearch;
import com.alibaba.fastjson.JSON;
import com.hhy.elasticsearch.entity.User;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.support.master.AcknowledgedResponse;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.action.update.UpdateResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.CreateIndexResponse;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.io.IOException;
import java.time.LocalDate;
import java.util.UUID;
@SpringBootTest
class ElasticsearchApplicationTests {
@Autowired
private RestHighLevelClient restHighLevelClient;
//索引的创建
@Test
public void createIndex(){
try {
//创建索引请求
CreateIndexRequest request = new CreateIndexRequest("test-index");
//客户端执行请求
CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
System.out.println(createIndexResponse);
} catch (IOException e) {
e.printStackTrace();
}
}
//索引是否存在
@Test
public void exitIndex() {
try {
GetIndexRequest request = new GetIndexRequest("test-index");
boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
System.out.println(exists);
} catch (IOException e) {
e.printStackTrace();
}
}
//索引的删除
@Test
public void delIndex() {
try {
DeleteIndexRequest request = new DeleteIndexRequest("test-index");
AcknowledgedResponse delete = restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
System.out.println(delete.isAcknowledged());
} catch (IOException e) {
e.printStackTrace();
}
}
//文档的创建
@Test
public void addDocument() {
try {
//创建对象
User user = new User("wangwu", 20, LocalDate.parse("2000-01-01"), new String[]{"唱", "跳", "rap", "篮球"});
//创建请求
IndexRequest request = new IndexRequest("test-index");
//规则 put /test-index/_doc/id
request.id(UUID.randomUUID().toString());//我的结果UUID 095abde7-23e8-4939-9ee9-21140fa378c1
//数据封入json
IndexRequest source = request.source(JSON.toJSONString(user), XContentType.JSON);
//客户端发送请求,获取响应结果
IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
System.out.println(response.toString());
//对应我们命令返回的状态
System.out.println(response.status());
} catch (IOException e) {
e.printStackTrace();
}
}
//文档是否存在
@Test
public void exitDocument() {
try {
//获取文档,判断是否存在 get /index/_doc/id
GetRequest getRequest = new GetRequest("test-index", "095abde7-23e8-4939-9ee9-21140fa378c1");//index,id
//不返回_source的上下文
getRequest.fetchSourceContext(new FetchSourceContext(false));
boolean exists = restHighLevelClient.exists(getRequest, RequestOptions.DEFAULT);
System.out.println(exists);
} catch (IOException e) {
e.printStackTrace();
}
}
//获取文档内容
@Test
public void getDocument() {
try {
GetRequest getRequest = new GetRequest("test-index", "095abde7-23e8-4939-9ee9-21140fa378c1");//index,id
GetResponse documentFields = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
System.out.println(documentFields.toString());
//{"_index":"test-index","_type":"_doc","_id":"095abde7-23e8-4939-9ee9-21140fa378c1","_version":1,"_seq_no":0,"_primary_term":1,"found":true,"_source":{"age":20,"birthday":"2000-01-01","hobby":["唱","跳","rap","篮球"],"name":"张三"}}
} catch (IOException e) {
e.printStackTrace();
}
}
//修改文档内容
@Test
public void updDocument() {
try {
UpdateRequest updateRequest = new UpdateRequest("test-index", "095abde7-23e8-4939-9ee9-21140fa378c1");
User user = new User();
user.setName("李四~~~~~~~~~~");
UpdateRequest doc = updateRequest.doc(JSON.toJSONString(user), XContentType.JSON);
UpdateResponse update = restHighLevelClient.update(doc, RequestOptions.DEFAULT);
System.out.println(update.status());//OK
//查看结果
getDocument();//{"_index":"test-index","_type":"_doc","_id":"095abde7-23e8-4939-9ee9-21140fa378c1","_version":2,"_seq_no":1,"_primary_term":2,"found":true,"_source":{"age":20,"birthday":"2000-01-01","hobby":["唱","跳","rap","篮球"],"name":"李四~~~~~~~~~~"}}
} catch (IOException e) {
e.printStackTrace();
}
}
//删除文档内容
@Test
public void delDocument() {
try {
DeleteRequest deleteRequest = new DeleteRequest("test-index", "095abde7-23e8-4939-9ee9-21140fa378c1");
DeleteResponse deleteResponse = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
System.out.println(deleteResponse.status());//OK
//是否存在
exitDocument();//false
} catch (IOException e) {
e.printStackTrace();
}
}
//查询
@Test
public void queryDocument(){
try {
SearchRequest searchRequest = new SearchRequest("test-index");
//构造查询条件
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
//查询条件可以使用 QueryBuilders工具类创建
//termQuery精确匹配
TermQueryBuilder builder = QueryBuilders.termQuery("name", "张三");
//matchAllQuery匹配所有QueryBuilders.matchAllQuery();
searchSourceBuilder.query(builder);
//分页 searchSourceBuilder.from(); searchSourceBuilder.size();
//高亮 searchSourceBuilder.highlighter();
//排序 searchSourceBuilder.sort()
searchRequest.source(searchSourceBuilder);
SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println(JSON.toJSONString(response.getHits()));
} catch (IOException e) {
e.printStackTrace();
}
}
}
问题
queryDocument()里 的QueryBuilders.termQuery(“name”, “张三”); 查询结果为空,
elasticsearch查询时termQuery查询中文匹配失败
解决方法
一
TermQueryBuilder builder = QueryBuilders.termQuery(“name.keyword”, “张三”);
二 相当于模糊查询(想要精确匹配不要用)
MatchQueryBuilder builder = QueryBuilders.matchQuery(“name”, “张三”);