微信搜一搜：科技猫，分享编程，软件，科技。

Spring Data Elasticsearch 我的项目提供了与 Elasticsearch 搜索引擎的集成。Spring Data Elasticsearch 的要害性能区域是一个以 POJO 为核心的模型，该模型用于与 Elastichsearch 文档进行交互并轻松编写存储库款式的数据拜访层。

Maven 依赖

<!--https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-elasticsearch-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
            <version>2.3.0.RELEASE</version>
        </dependency>

配置 application.properties

spring.elasticsearch.rest.uris=http://localhost:9200
# spring.elasticsearch.rest.username= // 用户名
# spring.elasticsearch.rest.password=// 明码
# spring.elasticsearch.rest.connection-timeout= // 连贯超时工夫
# spring.elasticsearch.rest.read-timeout= // 读取超时工夫 

CRUD 操作

实体类

package com.example.entity;

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;

import java.io.Serializable;

@Data
@Document(indexName = "account", type = "_doc")
public class Message implements Serializable {
    private static final long serialVersionUID = 5710293639676035958L;
    @Id
    private String id;

    @Field(type = FieldType.Text, analyzer = "ik_max_word")
    private String username;

    @Field(type = FieldType.Text, analyzer = "ik_max_word")
    private String email;

    @Field(type = FieldType.Long)
    private String age;

    @Field(type = FieldType.Long) // 意思自定义属性格局 工夫格局，咱们在 java 程序中能够传入这些格局的工夫
    private Long createTime;
}

Dao

package com.example.dao;

import com.example.entity.Message;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface MessageDao extends ElasticsearchRepository<Message, String> {Page<Message> findAll(Pageable pageable);

    Iterable<Message> findAll(Sort sort);

    List<Message> findByUsername(String username);

    List<Message> findByAgeBetween(Long mix, Long max);

    Long countByAgeBetween(Long mix, Long max);
}

Test

查问

package com.example;

import com.example.dao.MessageDao;
import com.example.entity.Message;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;

import java.util.List;

@SpringBootTest
public class SpringDataElasticsearchFindTest {
    @Autowired
    private MessageDao messageDao;

    @Test
    public void findAll() {Iterable<Message> all = messageDao.findAll();
        all.forEach(System.out::println);
    }

    @Test
    public void findAllPageRequest() {Iterable<Message> all = messageDao.findAll(PageRequest.of(0, 1));
        all.forEach(System.out::println);
    }

    @Test
    public void findAllSort() {Iterable<Message> all = messageDao.findAll(Sort.by("age").descending());
        all.forEach(System.out::println);
    }

    @Test
    public void findByUsername() {List<Message> messages = messageDao.findByUsername("JonssonYan");
        messages.forEach(System.out::println);
    }

    @Test
    public void findByAgeBetween() {List<Message> messages = messageDao.findByAgeBetween(10L, 20L);
        messages.forEach(System.out::println);
    }

    @Test
    public void countByAgeBetween() {Long count = messageDao.countByAgeBetween(10L, 20L);
        System.out.println(count);
    }
}

减少

package com.example;

import com.example.dao.MessageDao;
import com.example.entity.Message;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.Date;

@SpringBootTest
public class SpringDataElasticsearchInsertTest {
    @Autowired
    private MessageDao messageDao;

    @Test
    public void insert() {Message message = new Message();
        message.setId("3");
        message.setAge("18");
        message.setEmail("yz808@qq.com");
        message.setCreateTime(new Date().getTime());
        message.setUsername("JonssonYan");
        messageDao.save(message);
    }
}

删除

package com.example;

import com.example.dao.MessageDao;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
public class SpringDataElasticsearchDeleteTest {
    @Autowired
    private MessageDao messageDao;

    @Test
    public void deleteById(){messageDao.deleteById("2");
    }
}

自定义 JSON 查问

Dao

package com.example.dao;

import com.example.entity.Message;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.annotations.Query;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface MessageDao extends ElasticsearchRepository<Message, String> {@Query("{\"match\": {\"username\": {\"query\": \"?0\"}}}")
    List<Message> findByUsername(String username);
}

Test

@Test
    public void findByUsername() {List<Message> messages = messageDao.findByUsername("JonssonYan");
        messages.forEach(System.out::println);
    }

References

[1] Spring Data Elasticsearch: https://spring.io/projects/sp…