Elasticsearch8搭建及Springboot中集成使用

以下是一个简化的Spring Boot项目中集成Elasticsearch 8的例子：

1. 在pom.xml中添加依赖：

<dependencies>
    <!-- 添加Spring Boot的Elasticsearch依赖 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
 
    <!-- 添加Spring Boot的测试依赖 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2. 在application.properties或application.yml中配置Elasticsearch信息：

# application.properties
spring.data.elasticsearch.cluster-name=elasticsearch
spring.data.elasticsearch.cluster-nodes=localhost:9300
spring.elasticsearch.rest.uris=http://localhost:9200

3. 创建一个实体类来映射Elasticsearch中的文档：

import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
 
@Document(indexName = "sampleindex")
public class SampleEntity {
    @Id
    private String id;
    private String content;
 
    // 省略getter和setter方法
}

4. 创建一个Elasticsearch仓库接口：

import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
 
public interface SampleEntityRepository extends ElasticsearchRepository<SampleEntity, String> {
    // 可以添加自定义查询方法
}

5. 创建一个服务类使用仓库：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
@Service
public class SampleEntityService {
 
    @Autowired
    private SampleEntityRepository repository;
 
    public List<SampleEntity> findAll() {
        return repository.findAll();
    }
 
    // 其他业务方法
}

6. 创建一个控制器类来提供API接口：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import java.util.List;
 
@RestController
public class SampleEntityController {
 
    @Autowired
    private SampleEntityService service;
 
    @GetMapping("/entities")
    public List<SampleEntity> getAllEntities() {
        return service.findAll();
    }
}

7. 创建一个启动类：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class ElasticsearchDemoApplication {
 
    public static voi