Elasticsearch集成spring boot

Spring Data Elasticsearch

Spring Data Elasticsearch是Spring提供的一种以Spring Data风格来操作数据存储的方式，它可以避免编写大量的样板代码。

常用注解(用于实体上)

@Document

//标示映射到Elasticsearch文档上的领域对象
public @interface Document {
//索引库名次，mysql中数据库的概念    
String indexName();  
//文档类型，mysql中表的概念    
String type() default "";
//默认分片数
short shards() default5;
//默认副本数量
short replicas() default 1;
}

@Id

//表示是文档的id，文档可以认为是mysql中表行的概念
public @interface Id{}

@Field

public @interface Field{
//文档中字段的类型
FieldType type() default FieldType.Auto;
//是否建立倒排索引
boolean index() default true;
//是否进行存储
boolean store() default false;  
//分词器名次
String analyzer() default "";
}

FieldType 

//为文档自动指定元数据类型
public enum FieldType {
Text,
//会进行分词并建了索引的字符类型
Integer,
Long,
Date,
Float,
Double,
Boolean,
Object,
Auto,
//自动判断字段类型
Nested,
//嵌套对象类型
Ip,
Attachment,
Keyword
//不会进行分词建立索引的类型
}

整合spring boot

1.pom文件

<dependency>
   <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

2.application.yml

spring:
data:
    elasticsearch:
      repositories:
        enabled: true
      cluster-name: elasticsearch
      cluster-nodes: 192.168.49.14:9300

3.config文件

否则会报错  java.lang.IllegalStateException: availableProcessors is already set to [4], rejecting [4]

@Configuration
public class ElasticSearchConfig {
    /**
     * 防止netty的bug
     * java.lang.IllegalStateException: availableProcessors is already set to [4], rejecting [4]
     */
    @PostConstruct
    void init() {
        System.setProperty("es.set.netty.runtime.available.processors", "false");
    }
}

4.entity

@Document(indexName = "product", type = "product", shards = 1, replicas = 0)
public class Product {
    @Id
    private Long id;

    /**
     * 标题
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word")
    private String title;

    /**
     * 分类
     */
    @Field(type = FieldType.Keyword)
    private String category;

    /**
     * 价格
     */
    @Field(type = FieldType.Double)
    private Double price;

    /**
     * 图片地址
     */
    @Field(index = false, type = FieldType.Keyword)
    private String images;

    public Long getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public String getImages() {
        return images;
    }

    public void setImages(String images) {
        this.images = images;
    }

}

6.继承ElasticsearchRepository

这就是以上说的Sping Data方式的数据操作

@Service
public interface ProductRepository extends ElasticsearchRepository<Product, Long> {

}

继承ElasticsearchRepository接口可以获得常用的数据操作方法

7.controller

@RestController
public class ProductController {

    @Autowired
    private ProductRepository productRepository;

    /**
     * 插入
     */
    @RequestMapping("/importProduct")
    public void importProduct() {
        List<Product> list = new ArrayList<Product>();
        // 产品1
        Product product1 = new Product();
        product1.setId(Long.valueOf(1));
        product1.setTitle("Haier/海尔 BCD-470WDPG十字对开门风冷变频一级节能家用官方冰箱");
        product1.setPrice(3699.00);
        product1.setCategory("冰箱");
        product1.setImages("http://image.baidu.com/13123.jpg");

        // 产品2
        Product product2 = new Product();
        product2.setId(Long.valueOf(2));
        product2.setTitle("Panasonic/松下 NR-TC28WS1-N 风冷无霜家用抑菌三门小体积冰箱");
        product2.setPrice(5000.00);
        product2.setCategory("冰箱");
        product2.setImages("http://image.baidu.com/13123.jpg");

        // 产品3
        Product product3 = new Product();
        product3.setId(Long.valueOf(3));
        product3.setTitle("Changhong/长虹 50D4P 50英寸超薄无边全面屏4K超高清智能电视机");
        product3.setPrice(2666.00);
        product3.setCategory("电视");
        product3.setImages("http://image.baidu.com/13123.jpg");

        // 产品4
        Product product4 = new Product();
        product4.setId(Long.valueOf(4));
        product4.setTitle("创维40X6 40英寸高清电视机智能网络wifi平板液晶屏家用彩电32 43");
        product4.setPrice(1235.00);
        product4.setCategory("电视");
        product4.setImages("http://image.baidu.com/13123.jpg");

        list.add(product1);
        list.add(product2);
        list.add(product3);
        list.add(product4);
        productRepository.saveAll(list);
    }

    /**
     * 查询所有 通过自带方法
     * 
     * @return
     */
    @RequestMapping("/selectProductAll")
    public void selectProductAll() {
        Iterable<Product> list = productRepository.findAll();
        productRepository.deleteById(Long.valueOf(1));
        for (Product product : list) {
            System.out.println(product.getTitle());
        }
    }

    /**
     * 通过id删除
     */
    @RequestMapping("/deleteProduct")
    public void deleteProduct() {
        productRepository.deleteById(Long.valueOf(1));
    }

    /**
     * 删除全部
     */
    @RequestMapping("/deleteProductAll")
    public void deleteProductAll() {
        productRepository.deleteAll();
    }


}

调用以上接口 使用语句在kibana中验证

自定义方法

自定义方法的前提是我们需要继承ElasticsearchRepository接口，利用强大的Spring Data来实现。比如：你的方法名叫做：findByTitle，那么它就知道你是根据title查询，然后自动帮你完成，无需写实现类。

自定义方法命名约定

关键字	使用示例	等同于的ES查询
And	findByNameAndPrice	{“bool” : {“must” : [ {“field” : {“name” : “?”}}, {“field” : {“price” : “?”}} ]}}
Or	findByNameOrPrice	{“bool” : {“should” : [ {“field” : {“name” : “?”}}, {“field” : {“price” : “?”}} ]}}
Is	findByName	{“bool” : {“must” : {“field” : {“name” : “?”}}}}
Not	findByNameNot	{“bool” : {“must_not” : {“field” : {“name” : “?”}}}}
Between	findByPriceBetween	{“bool” : {“must” : {“range” : {“price” : {“from” : ?,”to” : ?,”include_lower” : true,”include_upper” : true}}}}}
LessThanEqual	findByPriceLessThan	{“bool” : {“must” : {“range” : {“price” : {“from” : null,”to” : ?,”include_lower” : true,”include_upper” : true}}}}}
GreaterThanEqual	findByPriceGreaterThan	{“bool” : {“must” : {“range” : {“price” : {“from” : ?,”to” : null,”include_lower” : true,”include_upper” : true}}}}}
Before	findByPriceBefore	{“bool” : {“must” : {“range” : {“price” : {“from” : null,”to” : ?,”include_lower” : true,”include_upper” : true}}}}}
After	findByPriceAfter	{“bool” : {“must” : {“range” : {“price” : {“from” : ?,”to” : null,”include_lower” : true,”include_upper” : true}}}}}
Like	findByNameLike	{“bool” : {“must” : {“field” : {“name” : {“query” : “? *”,”analyze_wildcard” : true}}}}}
StartingWith	findByNameStartingWith	{“bool” : {“must” : {“field” : {“name” : {“query” : “? *”,”analyze_wildcard” : true}}}}}
EndingWith	findByNameEndingWith	{“bool” : {“must” : {“field” : {“name” : {“query” : “*?”,”analyze_wildcard” : true}}}}}
Contains/Containing	findByNameContaining	{“bool” : {“must” : {“field” : {“name” : {“query” : “?”,”analyze_wildcard” : true}}}}}
In	findByNameIn(Collectionnames)	{“bool” : {“must” : {“bool” : {“should” : [ {“field” : {“name” : “?”}}, {“field” : {“name” : “?”}} ]}}}}
NotIn	findByNameNotIn(Collectionnames)	{“bool” : {“must_not” : {“bool” : {“should” : {“field” : {“name” : “?”}}}}}}
True	findByAvailableTrue	{“bool” : {“must” : {“field” : {“available” : true}}}}
False	findByAvailableFalse	{“bool” : {“must” : {“field” : {“available” : false}}}}
OrderBy	findByAvailableTrueOrderByNameDesc	{“sort” : [{ “name” : {“order” : “desc”} }],”bool” : {“must” : {“field” : {“available” : true}}}}

修改ProductRepository

@Service
public interface ProductRepository extends ElasticsearchRepository<Product, Long> {

    List<Product> findByTitle(String title);
}

controller

@GetMapping("/selectProductByCustom")
    public List<Product> selectProductByCustom(String title) {
        List<Product> result = productRepository.findByTitle(title );
        return result;
    }

即可定制自己的查询

注意：

None of the configured nodes are available: [{#transport#-1}{T9wtimn9R7u6v8SZAmOMsA}{192.168.49.14}{192.168.49.14:9200}]

1:解决:需要开通9300端口

2:楼主这使用的ElasticSearch版本为7.6.0 对应的spring boot版本2.2.5.RELEASE 之前用的2.1.8不好使

参考:https://juejin.im/post/5e94587f51882573be11cb83

        https://blog.csdn.net/sinat_42338962/article/details/85227902