SpringBoot集成Elasticsearch 7.x spring-boot-starter-data-elasticsearch 方式

SpringBoot集成Elasticsearch 7.x | spring-boot-starter-data-elasticsearch 方式

前言
添加maven依赖
配置application.properties
测试实体类
- 方式一：继承 ElasticsearchRepository（适合简单查询）
- - 直接使用
  - 想自定义自己的Repository接口
- 方式二：使用ElasticsearchRestTemplate（更适合用于复杂查询）
- - 添加单个文档
  - 简单查询-通过id

前言

由 Spring 提供，是 Spring 在 ES 官方接口基础之上的二次封装，使用简单，易于上手；
缺点是更新太慢，SpringBoot 2.2.x 才提供对 es7.x 的支持，版本关联性很大，不易维护；

不过在此还是讲一下 starter 启动器下的集成步骤，万一官方更新速度加快了呢。

Java High Level Rest Client方式去集成 Elasticsearch（这个是目前公司常用的方式）

添加maven依赖

<!--spring boot 整合 elasticsearch -->
<!--不用填写具体版本，spring boot 会自动找与之适配的 -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

配置application.properties

旧版本

server.port=8091spring.elasticsearch.rest.uris=http://127.0.0.1:9200
spring.elasticsearch.rest.username=elastic
spring.elasticsearch.rest.password=1234567

新版本(去掉了rest)

server.port=8091spring.elasticsearch.uris=http://127.0.0.1:9200
spring.elasticsearch.username=elastic
spring.elasticsearch.password=1234567

测试实体类

创建一个员工的实体类
关键注解 @Document、@Id、@Field

package com.example.springbootfull.elasticsearch.bean;import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.DateFormat;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;import java.math.BigDecimal;
import java.util.Date;/*** 员工实体类* @Document：作用在类上，标记实体类为文档对象。 indexName（索引名称，相当于数据库的表名称）* @Id：作用在成员变量上，标记一个字段作为id主键。 在Elasticsearch中，文档ID是唯一的，用于标识文档。* @Field：定义Java对象属性与Elasticsearch文档字段之间的映射关系。* @author*/
@Document(indexName = "employee_info")
public class EmployeeInfo {@Idprivate Long id;/*** 工号*/@Field(name = "job_no")private String jobNo;/*** 姓名*/@Field(name = "name")private String name;/*** 英文名*/@Field(name = "english_name")private String englishName;/*** 工作岗位*/private String job;/*** 性别*/private Integer sex;/*** 年龄*/private Integer age;/*** 薪资*/private BigDecimal salary;/*** 入职时间*/@Field(name = "job_day", format = DateFormat.date_time)private Date jobDay;/*** 备注*/private String remark;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getJobNo() {return jobNo;}public void setJobNo(String jobNo) {this.jobNo = jobNo;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getEnglishName() {return englishName;}public void setEnglishName(String englishName) {this.englishName = englishName;}public String getJob() {return job;}public void setJob(String job) {this.job = job;}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public BigDecimal getSalary() {return salary;}public void setSalary(BigDecimal salary) {this.salary = salary;}public Date getJobDay() {return jobDay;}public void setJobDay(Date jobDay) {this.jobDay = jobDay;}public String getRemark() {return remark;}public void setRemark(String remark) {this.remark = remark;}public EmployeeInfo() {}public EmployeeInfo(Long id, String jobNo, String name, String englishName, String job, Integer sex, Integer age, BigDecimal salary, Date jobDay, String remark) {this.id = id;this.jobNo = jobNo;this.name = name;this.englishName = englishName;this.job = job;this.sex = sex;this.age = age;this.salary = salary;this.jobDay = jobDay;this.remark = remark;}@Overridepublic String toString() {return "EmployeeInfo{" +"id=" + id +", jobNo='" + jobNo + ''' +", name='" + name + ''' +", englishName='" + englishName + ''' +", job='" + job + ''' +", sex=" + sex +", age=" + age +", salary=" + salary +", jobDay=" + jobDay +", remark='" + remark + ''' +'}';}
}

方式一：继承 ElasticsearchRepository（适合简单查询）

ElasticsearchRepository 提供了一个高级的抽象，使得你可以在不编写任何实现代码的情况下，直接使用预定义的CRUD方法和查询方法。

业务层接口继承 ElasticsearchRepository 类
泛型的参数分别是实体类型和主键类型
例如：

public interface EmployeeInfoRepository extends ElasticsearchRepository<EmployeeInfo, Long> {}

然后就可以直接使用了

直接使用

添加单个文档

package com.example.springbootfull.elasticsearch.controller;import com.example.springbootfull.elasticsearch.bean.EmployeeInfo;
import com.example.springbootfull.elasticsearch.service.EmployeeInfoRepository;
import com.example.springbootfull.elasticsearch.service.EmployeeInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;@RestController
@RequestMapping("/employeeInfo")
public class EmployeeElasticController {@Autowiredprivate EmployeeInfoRepository elasticRepository;@RequestMapping("/save")public String save() throws Exception {SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");EmployeeInfo employeeInfo = new EmployeeInfo(6001L, "2001", "张三", "zhangsan", "Java", 1, 19, new BigDecimal("12500.01"), simpleDateFormat.parse("2019-09-10"), "备注");elasticRepository.save(employeeInfo);return "success";}}

执行后，es上面新增成功了。
在这里插入图片描述

想自定义自己的Repository接口

就要遵守自定义方法命名规范

【自定义方法命名约定】：
在这里插入图片描述

例如：我们来按照年龄区间查询，定义这样的一个方法findByAgeBetween：

/*** 需要继承ElasticsearchRepository接口* 由于Item实体类中id为Long类型*/
public interface EmployeeInfoRepository extends ElasticsearchRepository<EmployeeInfo, Long>/*** 方法名必须遵守SpringData的规范* 年龄区间查询*/List<EmployeeInfo> findByAgeBetween(int age1, int age2);
}

然后，再通过saveAll新增多些数据，再进行自定义的方法进行查询

package com.example.springbootfull.elasticsearch.controller;import com.example.springbootfull.elasticsearch.bean.EmployeeInfo;
import com.example.springbootfull.elasticsearch.service.EmployeeInfoRepository;
import com.example.springbootfull.elasticsearch.service.EmployeeInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;@RestController
@RequestMapping("/employeeInfo")
public class EmployeeElasticController {@Autowiredprivate EmployeeInfoRepository elasticRepository;@RequestMapping("/saveAll")public String saveAll() throws Exception {List<EmployeeInfo> list = new ArrayList<>();SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");list.add(new EmployeeInfo(1001L, "2001", "张三", "zhangsan", "Java", 1, 19, new BigDecimal("12500.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1002L, "2002", "李四", "lisi", "PHP", 1, 18, new BigDecimal("11600.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1003L, "2003", "王五", "wangwu", "C++", 1, 20, new BigDecimal("9900.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1004L, "2004", "赵六", "zhaoliu", "Java Leader", 1, 20, new BigDecimal("20000.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1005L, "2005", "小五", "xiaowu", "H5", 1, 17, new BigDecimal("10600.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1006L, "2006", "小六", "xaioliu", "web", 1, 20, new BigDecimal("12600.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1007L, "2007", "小七", "xiaoqi", "app", 1, 22, new BigDecimal("20000.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1008L, "2008", "小八", "xaioba", "Java", 1, 21, new BigDecimal("11000.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1009L, "2009", "小九", "xiaojiu", "Java", 1, 20, new BigDecimal("14000.01"), simpleDateFormat.parse("2019-09-10"), "备注"));list.add(new EmployeeInfo(1010L, "2010", "大十", "dashi", "Java", 1, 20, new BigDecimal("13000.01"), simpleDateFormat.parse("2019-09-10"), "备注"));elasticRepository.saveAll(list);return "success -> " + list.size();}@RequestMapping("/findByAgeBetween")public String findByAgeBetween(){elasticRepository.findByAgeBetween(10,20);return "success";}}

使用 findByAgeBetween 查询后的效果
在这里插入图片描述

方式二：使用ElasticsearchRestTemplate（更适合用于复杂查询）

与 ElasticsearchRepository 相比，ElasticsearchRestTemplate 更适合用于复杂查询。
比如多个条件组合、范围查询、模糊查询、聚合查询等复杂场景
还支持分页、排序、过滤等高级功能

添加单个文档

@RestController
@RequestMapping("/employeeInfo")
public class EmployeeElasticController {@Autowiredprivate ElasticsearchRestTemplate elasticsearchRestTemplate;@RequestMapping("/template/save")public String  templateSave() throws Exception  {SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");EmployeeInfo employeeInfo = new EmployeeInfo(8888L, "2001", "张八", "zhangsan", "Java", 1, 19, new BigDecimal("12500.01"), simpleDateFormat.parse("2019-09-10"), "备注");elasticsearchRestTemplate.save(employeeInfo);return "success";}

在这里插入图片描述

简单查询-通过id

@RestController
@RequestMapping("/employeeInfo")
public class EmployeeElasticController {@Autowiredprivate ElasticsearchRestTemplate elasticsearchRestTemplate;@RequestMapping("/getEmployeeInfo")public EmployeeInfo getEmployeeInfo() {return elasticsearchRestTemplate.get("6001", EmployeeInfo.class);}

查询结果如下
在这里插入图片描述

批量添加、删除、复杂的查询等等其余的我就不多说了

【参考文章】
【1】SpringBoot-starter-data整合Elasticsearch
【2】SpringBoot之ElasticsearchRestTemplate常用示例
【3】Spring Data Elasticsearch篇(3):ElasticsearchRepository文档操作