spring boot Elasticsearch
前提：如果把es放到spring boot，一定要注意版本问题，必看如下图：
我这里构建的是spring boot
<version>2.3.6.RELEASE</version>版本
pox.xml配置如下：
<?xml version="1.0" encoding="UTF-8"?>
<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>2.3.6.RELEASE</version>
<relativePath/>
</parent>
<groupId>com.demo</groupId>
<artifactId>es</artifactId>
<version>1.0</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-test</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
</dependency>
</dependencies>
</project>
构建实体类，实体类对应的是es的文档，也就是像表差不多的数据
package com.demo.es;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
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;
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Document(indexName = "product", shards = 3, replicas = 1)
public class Product {
@Id
private Long id;//商品唯一标识
@Field(type = FieldType.Text)
private String title;//商品名称
@Field(type = FieldType.Keyword)
private String category;//分类名称
@Field(type = FieldType.Double)
private Double price;//商品价格
@Field(type = FieldType.Keyword, index = false)
private String images;//图片地址
}
Es的配置类，spring bootmian方法启动的时候自动获得es的链接，然后根据实体类的配置生成索引，之后可以去Kibana查看索引，也可以使用Postman查看
下面是具体的配置类：
package com.demo.es;
import lombok.Data;
import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;
@ConfigurationProperties(prefix = "elasticsearch")
@Configuration
@Data
public class ElasticsearchConfig extends AbstractElasticsearchConfiguration {
private String host ;
private Integer port ;
//重写父类方法
@Override
public RestHighLevelClient elasticsearchClient() {
RestClientBuilder builder = RestClient.builder(new HttpHost(host, port));
RestHighLevelClient restHighLevelClient = new RestHighLevelClient(builder);
return restHighLevelClient;
}
}
配置文件application.properties如下：
# 本机IP或者你自己启动的服务器IP
elasticsearch.host=127.0.0.1
# es对应启动的端口
elasticsearch.port=9200
#启动日志打印
logging.level.com.demo.es=debug
创建增删改的接口，增删改所有的操作都会对es进行操作，需要继承ElasticsearchRepository，只需要继承就可以使用增删改查询等等方法了。
package com.demo.es;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface ProductDao extends ElasticsearchRepository<Product,Long> {
List<Product> findByTitleLike(String title);
}
这边使用的
@SpringBootTest进行测试，在测试之前要看一下es有没有创建索引，如果没有创建需要启动spring boot，mian方法，还有再强调一次，es跟spring boot的版本一定要对应，不然启动的时候会报找不到
AbstractElasticsearchConfiguration.class,就算你maven里面有这个包也不能启动，版本一定要对应，下面是我测试类的内容，可以自己进行测试，也可以写成接口进行调用：
package com.demo.es;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.ArrayList;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringDataESIndexTest {
@Autowired
private ProductDao productDao;
/**
* 新增
*/
@Test
public void save(){
Product product = new Product();
product.setId(2L);
product.setTitle("华为手机");
product.setCategory("手机");
product.setPrice(2999.0);
product.setImages("http://www.atguigu/hw.jpg");
productDao.save(product);
}
//修改
@Test
public void update(){
Product product = new Product();
product.setId(1L);
product.setTitle("小米 2 手机");
product.setCategory("手机");
product.setPrice(9999.0);
product.setImages("http://www.atguigu/xm.jpg");
productDao.save(product);
}
//根据 id 查询
@Test
public void findById(){
Product product = productDao.findById(1L).get();
System.out.println(product);
}
//批量新增
@Test
public void saveAll(){
List<Product> productList = new ArrayList<>();
for (int i = 0; i < 10; i++) {
Product product = new Product();
product.setId(Long.valueOf(i));
product.setTitle("["+i+"]小米手机");
product.setCategory("手机");
product.setPrice(1999.0+i);
product.setImages("http://www.atguigu/xm.jpg");
productList.add(product);
}
productDao.saveAll(productList);
}
//分页查询
@Test
public void findByPageable(){
//设置排序(排序方式，正序还是倒序，排序的 id)
Sort sort = Sort.by(Sort.Direction.DESC,"id");
int currentPage=0;//当前页，第一页从 0 开始，1 表示第二页
int pageSize = 5;//每页显示多少条
//设置查询分页
PageRequest pageRequest = PageRequest.of(currentPage, pageSize,sort);
//分页查询
Page<Product> productPage = productDao.findAll(pageRequest);
for (Product Product : productPage.getContent()) {
System.out.println(Product);
}
}
/**
* term 查询
* search(termQueryBuilder) 调用搜索方法，参数查询构建器对象
*/
@Test
public void termQuery(){
TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", " 小米");
Iterable<Product> products = productDao.search(termQueryBuilder);
for (Product product : products) {
System.out.println(product);
}
}
/**
* term 查询加分页
*/
@Test
public void termQueryByPage(){
int currentPage= 0 ;
int pageSize = 5;
//设置查询分页
PageRequest pageRequest = PageRequest.of(currentPage, pageSize);
TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", "[3]小米手机");
Iterable<Product> products =
productDao.search(termQueryBuilder,pageRequest);
for (Product product : products) {
System.out.println(product);
}
}
/**
* 根据title查询
*/
@Test
public void queryTitle(){
List<Product> list= productDao.findByTitleLike("小米");
for (int i = 0; i < list.size(); i++) {
System.out.println(list.get(i));
}
}
}
总结完毕，如果要学习具体的查询语法，跟一些sql操作可以查看
https://docs.spring.io/spring-data/elasticsearch/docs/4.2.3/reference/html/#elasticsearch.clients
这个网站有对应的es操作数据的方法等等，欢迎一起讨论学习
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