Java中spring boot2集成ES案例详解

在这里插入图片描述
一:运行环境
JDK:1.8
ES:5.6.4
二:学习内容
如何构建spring-data-elasticsearch环境?
如何实现常用的增删改查?
如何实现对象嵌套也就是1对多这种关系?
三:JAVA依赖环境
根据spring-data-elasticsearch官网说明,我这采用的是3.0.6.RELEASE版本,spring boot采用的是2.0.1.RELEASE;

4.0.0

<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>2.0.1.RELEASE</version>
	<relativePath />
</parent>


<groupId>com.huize.pluto.els</groupId>
<artifactId>demo</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<url>http://maven.apache.org</url>

<properties>
	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	<elasticsearch.version>5.6.4</elasticsearch.version>
	<java.version>1.8</java.version>
</properties>

<repositories>
	<repository>
		<id>spring-libs-milestone</id>
		<url>https://repo.spring.io/libs-milestone</url>
	</repository>
</repositories>

<pluginRepositories>
	<pluginRepository>
		<id>spring-plugins-release</id>
		<url>https://repo.spring.io/plugins-release</url>
	</pluginRepository>
</pluginRepositories>

<dependencies>
	<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>
		<scope>test</scope>
	</dependency>
	
	<dependency>
		<groupId>org.springframework.data</groupId>
		<artifactId>spring-data-elasticsearch</artifactId>
		<version>3.0.6.RELEASE</version>
	</dependency>
    
    <!-- 强制声明ES版本 -->
	<dependency>
		<groupId>org.elasticsearch</groupId>
		<artifactId>elasticsearch</artifactId>
		<version>${elasticsearch.version}</version>
	</dependency>
	
    <!-- 因为要采用java编码直接操作ES所以需要引入 -->
	<dependency>
		<groupId>org.elasticsearch.client</groupId>
		<artifactId>transport</artifactId>
		<version>${elasticsearch.version}</version>
		<exclusions>
			<exclusion>
				<groupId>commons-logging</groupId>
				<artifactId>commons-logging</artifactId>
			</exclusion>
		</exclusions>
	</dependency>
	
</dependencies>


<build>
	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>3.5.1</version>
			<configuration>
				<source>1.8</source>
				<target>1.8</target>
				<compilerVersion>1.8</compilerVersion>
				<encoding>UTF-8</encoding>
			</configuration>
		</plugin>
	</plugins>
</build>
四、spring-data-elasticsearch详解 4.1:配置ES声明 ElasticsearchTemplate bean ; (当然也可以采用spring boot自动配置方法来实现,因为后面还得直接用JAVA API操作ES,所以这用代码配置了) /*** ** 配置ES,支持集群 */ @Configuration public class ElasticConfigration {
@Value("${elasticsearch.host}")
private String esHost;

@Value("${elasticsearch.port}")
private int esPort;

@Value("${elasticsearch.clusterName}")
private String esClusterName;

private TransportClient client;

@PostConstruct
public void initialize() throws Exception {
   Settings esSettings = Settings.builder()
              .put("cluster.name", esClusterName)
              .put("client.transport.sniff", true).build();
   client = new PreBuiltTransportClient(esSettings);

   String[] esHosts = esHost.trim().split(",");
   for (String host : esHosts) {
       client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(host), 
       esPort));
   }
}

@Bean
public Client client() {
   return client;
}


@Bean
public ElasticsearchTemplate elasticsearchTemplate() throws Exception {
   return new ElasticsearchTemplate(client);
}


@PreDestroy
public void destroy() {
  if (client != null) {
       client.close();
   }
}

}4.2:编写实体类声明各个字段类型及相应属性:/**

  • 声明 USER实体,注意有一个1对多关系的roles
    **/
    @Document(indexName = “test-user”, type = “user”,replicas=0,shards=3)
    public class User {

    @Id
    private String id;

    @Field(type=FieldType.keyword)
    private String userName;

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

    @Field(type=FieldType.Date)
    private Date birthday;

    /**

    • 声明分词器为ik_smart (注意 es要安装ik分词器插件)
      */
      @Field(searchAnalyzer=“ik_smart”,analyzer=“ik_smart”,type=FieldType.text)
      private String description;

    /**

    • 1对多在spring-data-elasticsearch 统一为nested类型
      **/
      @Field(type=FieldType.Nested,includeInParent=true)
      private List roles;

    public User() {}

    public User(String userName,Integer age,Date birthday,String description) {
    this.userName = userName;
    this.age = age;
    this.birthday = birthday;
    this.description = description;
    }

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    public String getId() {
    return id;
    }

    public void setId(String id) {
    this.id = id;
    }

    public String getUserName() {
    return userName;
    }

    public void setUserName(String userName) {
    this.userName = userName;
    }

    public Date getBirthday() {
    return birthday;
    }

    public void setBirthday(Date birthday) {
    this.birthday = birthday;
    }

    public Integer getAge() {
    return age;
    }

    public void setAge(Integer age) {
    this.age = age;
    }

    public String getDescription() {
    return description;
    }

    public void setDescription(String description) {
    this.description = description;
    }

    public List getRoles() {
    return roles;
    }

    public void setRoles(List roles) {
    this.roles = roles;
    }

}

@Document(indexName = “test-role”, type = “role”,replicas=0,shards=3)
public class Role {

@Id
private String id;

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

@Field(type=FieldType.Date)
private Date createTime;

@Field(searchAnalyzer="ik_smart",analyzer="ik_smart",type=FieldType.text)
private String description;

public Role() {}

public Role(String name,String description,Date createTime) {
this.name = name;
this.description = description;
this.createTime = createTime;
}

public String getId() {
    return id;
}


public void setId(String id) {
    this.id = id;
}


public String getName() {
    return name;
}


public void setName(String name) {
    this.name = name;
}


public Date getCreateTime() {
    return createTime;
}


public void setCreateTime(Date createTime) {
    this.createTime = createTime;
}


public String getDescription() {
    return description;
}


public void setDescription(String description) {
    this.description = description;
}

}
4.3:编写dao只要继承ElasticsearchRepository就具有常用的增删减查功能了,可以新增一些其他需要用到的查询public interface UserRepository extends ElasticsearchRepository<User,String>{

//按userName like查询
List<User> findByUserNameLike(String userName);

//按role的name属性查询
List<User> findByRolesName(String name);

//按role的name属性查询 两种方式都可以
List<User> findByRoles_Name(String name);

}
4.4:编写service@Service
public class UserStandardService implements StandardService{

@Autowired
private UserRepository userRepository;

@Autowired
private ElasticsearchTemplate elasticsearchTemplate;

/**
 * 批量新增
 **/
@Override
public void batchAddUser(List<User> users) {
   if(CollectionUtils.isEmpty(users)) {
      return ;
   }
   List<IndexQuery> queries = Lists.newArrayListWithExpectedSize(users.size());
   IndexQuery indexItem  = null;
   for(User user :users) {
       indexItem = new IndexQuery();
       indexItem.setObject(user);
       queries.add(indexItem);
   }
   elasticsearchTemplate.bulkIndex(queries);
}

@Override
public void addUser(User user) {
   userRepository.save(user);
}

@Override
public void deletedUserById(String id) {
   userRepository.deleteById(id);
}

/**
 * 根据userId更新信息
 */
@Override
public void updateUser(User user) {
   UpdateQuery updateQuery = new UpdateQuery();
   updateQuery.setId(user.getId());
   updateQuery.setClazz(User.class);
   user.setId(null);
   UpdateRequest request = new UpdateRequest();
   request.doc(JsonUtils.beanToJson(user));
   updateQuery.setUpdateRequest(request);
   elasticsearchTemplate.update(updateQuery);
}

@Override
public List<User> queryByUserName(String userName) {
   return userRepository.findByUserNameLike(userName);
}

@Override
public List<User> queryByRoleName(Role role) {
   return userRepository.findByRoles_Name(role.getName());
}

}
4.5:启动主要要加上 @EnableElasticsearchRepositories 注解;@EnableElasticsearchRepositories(basePackages = “com.test.els.demo.core.user.repository”)
@SpringBootApplication
public class DemoApplication {

private static final Logger logger = LoggerFactory.getLogger(DemoApplication.class);

public static void main(String[] args) {

   SpringApplication.run(DemoApplication.class, args);
   logger.info("start completed !");
}

}OK,到这spring-data-elasticsearch 实践完了。
文章来自:https://www.itjmd.com/news/show-4253.html

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转载自blog.csdn.net/a6984021/article/details/84583465