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；
<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 http://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>2.0.1.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>
</project>
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<Role> 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;
}
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<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> 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。