River Flows In You
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环境

  • springboot：2.1.6.RELEASE
  • elasticsearch: 6.5.3

简介

目前 Elasticsearch 有很多第三方 Java 客户端如 TransportClient，Jest, Spring Data Elasticsearch（Spring Data 对 Elasticsearch 的整合）,还有官方的Java REST Client，而Java REST Client 有两种版本:

  1. Java Low Level REST Client
  2. Java High Level REST Client

Java high-level REST client 是目前官方推荐使用的客户端

一 Springboot Data集成

  1. pom文件

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    <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>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <scope>provided</scope>
    </dependency>
    <!--工具类-->    
    <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.5.0</version>
    </dependency>

  2. application配置文件

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    server:
      port: 8080
    spring:
      data:
        elasticsearch:
          cluster-nodes: 192.168.109.134:9300   #代码是9300端口
          cluster-name: my-application          #和./config/elasticsearch.yml的cluster-name名字相同

  3. 实体类

    @Document 注解主要声明索引名、类型名

    @Field 注解主要声明字段对应ES的类型

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    @Document(indexName = "person", type = "person")
    @Data
    @AllArgsConstructor
    public class Person {

        //id字段是必须的，可以不写注解@Id
        @Id
        private Long id;

        @Field(type = FieldType.Keyword)
        private String name;

        @Field(type = FieldType.Integer)
        private Integer age;
    }

  4. repostory

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    public interface PersonRepository extends ElasticsearchRepository<Person, Long> {
    }

  5. 测试

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    @Slf4j
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class PersonRepositoryTest {
        @Autowired
        private PersonRepository repo;

        /**
         * 测试新增
         */
        @Test
        public void save() {
            Person person = new Person(1L, "刘备", 18);
            Person save = repo.save(person);
            log.info("【save】= {}", save);
        }

        /**
         * 测试批量新增
         */
        @Test
        public void saveList() {
            List<Person> personList = Lists.newArrayList();
            personList.add(new Person(2L, "曹操", 20));
            personList.add(new Person(3L, "孙权", 19));
            personList.add(new Person(4L, "诸葛亮", 16));
            Iterable<Person> people = repo.saveAll(personList);
            log.info("【people】= {}", people);
        }

        /**
         * 测试更新
         */
        @Test
        public void update() {
            repo.findById(1L).ifPresent(person -> {
                person.setName(person.getName() + "\n更新更新更新更新更新");
                Person save = repo.save(person);
                log.info("【save】= {}", save);
            });
        }

        /**
         * 测试删除
         */
        @Test
        public void delete() {
            // 主键删除
            repo.deleteById(1L);

            // 对象删除
            repo.findById(2L).ifPresent(person -> repo.delete(person));

            // 批量删除
            repo.deleteAll(repo.findAll());
        }

        /**
         * 测试普通查询，按年龄倒序
         */
        @Test
        public void select() {
            repo.findAll(Sort.by(Sort.Direction.DESC, "age"))
                    .forEach(person -> log.info("{} 生日: {}", person.getName(), person.getAge()));
        }

        /**
         * 自定义查询，根据年龄范围查询
         */
        @Test
        public void customSelectRangeOfAge() {
            repo.findByAgeBetween(18, 19).forEach(person -> log.info("{} 年龄: {}", person.getName(), person.getAge()));
        }
    }

二 Springboot集成Java high-level REST client

  1. pom 文件

    必须的依赖

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    <properties>
        <elasticsearch>7.3.0</elasticsearch>
    </properties>
    <dependencies>
        <!-- elasticsearch -->
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>${elasticsearch}</version>
        </dependency>
        <!-- elasticsearch-rest-client -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
            <version>${elasticsearch}</version>
        </dependency>
        <!-- elasticsearch-rest-high-level-client -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>${elasticsearch}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.elasticsearch.client</groupId>
                    <artifactId>elasticsearch-rest-client</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.elasticsearch</groupId>
                    <artifactId>elasticsearch</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--工具类-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.5.0</version>
        </dependency>
    </dependencies>

  1. application 配置文件

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    server:
      port: 8080
    demo:
      data:
        elasticsearch:
          cluster-nodes: 192.168.109.134:9200   #这个是9200端口
          cluster-name: my-application          #和/config/elasticsearch.yml的cluster-name名字相同

  2. 具体代码实现： https://github.com/Lrxc/spring-boot-demo/tree/master/demo-elasticsearch-rest-high-level-client

常见错误

  1. elasticsearch Validation Failed: 1: type is missing;

    ES服务器版本过低，升级到7.x以上

参考：

https://zhuanlan.zhihu.com/p/42763550