SpringBoot连接ElasticSearch8.*-Toy模板网

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系统中需要使用到ElasticSearch进行内容检索，因此需要搭建SpringBoot + ElasticSearch的环境。文章来源地址https://www.toymoban.com/news/detail-602425.html

1、pom.xml文件中的引用

<?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>2.7.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <java.version>1.8</java.version>
        <elastic-client.version>7.17.6</elastic-client.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
<!--        注意：此方式已过期，会报错-->
<!--        <dependency>-->
<!--            <groupId>org.elasticsearch.client</groupId>-->
<!--            <artifactId>elasticsearch-rest-high-level-client</artifactId>-->
<!--            <version>${elasticsearch.version}</version>-->
<!--        </dependency>-->
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>${elasticsearch.version}</version>
<!--        elasticsearch.version = 7.17.6-->
        </dependency>
<!--    一定要添加此引用，否则会报错 -->
        <dependency>
            <groupId>jakarta.json</groupId>
            <artifactId>jakarta.json-api</artifactId>
            <version>2.0.1</version>
        </dependency>
<!--    用于快速创建Model -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

</project>

2、修改application.yml

# .....
spring:
  elasticsearch:
    uris: http://<<your-elasticsearch-ip-address>>:<<your-port, default is 9200>>
    password: .....
    username: user
# ....

3、修改Application.java

@SpringBootApplication
@Configuration
public class HeatSearchEngineApplication {
    public static void main(String[] args) {
        SpringApplication.run(HeatSearchEngineApplication.class, args);
    }


    @Bean("restClient")
    public ElasticsearchClient elasticsearchClient() {

        RestClient httpClient = RestClient.builder(new HttpHost("192.168.193.66", 9200)).build();

        // 不引用jakarta.json-api时，此行会报错
        ElasticsearchTransport transport = new RestClientTransport(httpClient, new JacksonJsonpMapper());

        ElasticsearchClient esClient = new ElasticsearchClient(transport);

        return esClient;
    }
}

4、创建File的Model

package com.xxxx.model;

import lombok.Data;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
import org.springframework.data.elasticsearch.annotations.FieldType;

@Data
@Document(indexName = "all-files")
@JsonIgnoreProperties(ignoreUnknown = true) // Model中需要添加此行代码，否则检索时可能会报错
public class File {
    @Id
    private Long id;
    @Field(type = FieldType.Text)
    private String name;
    @Field(type = FieldType.Text)
    private String nameEn;

    @Override
    public String toString() {
        return "File {" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", nameEn='" + nameEn + '\'' +
                '}';
    }
}

5、创建FileRepository

package com.xxxxx.dao;

import com.grid.heat.search.model.File;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface FileRepository extends ElasticsearchRepository<File, Long> {
}

6、编写一个API用于测试

@RestController()
@RequestMapping("/test")
public class TestController {

    @Autowired
    public RestHighLevelClient restClient;

    @Autowired
    public FileRepository fileRepository;

    @GetMapping("/add")
    public boolean add() {
        File file = new File();
        file.setId(UuidUtil.getId());
        file.setName("aaaaat");
        file.setNameEn("test1");

        fileRepository.save(file);

        return true;
    }

    // 请自行编写其它测试方法
}

附、UuidUtil工具类的实现如下：

public class UuidUtil {

    private static AtomicLong id;


    /**
     * 生成Long 类型唯一ID
     */
    public synchronized static Long getId() {
        //如果需要更长 或者更大冗余空间, 只需要 time * 10^n   即可
        //当前可保证1毫秒 生成 10000条不重复
        Long time = Long.valueOf(new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()))*10000;
        if (id == null) {
            id = new AtomicLong(time);
            return id.get();
        }
        if (time <= id.get()) {
            id.addAndGet(1);
        } else {
            id = new AtomicLong(time);
        }
        return id.get();
    }
}

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