SpringBoot整合elasticsearch

ElasticSearch是一个基于Lucene的搜索服务器。它提供了一个分布式多用户能力的全文搜索引擎,基于RESTful web接口。Elasticsearch是用Java开发的,并作为Apache许可条款下的开放源码发布,是当前流行的企业级搜索引擎。设计用于云计算中,能够达到实时搜索,稳定,可靠,快速,安装使用方便。
我们建立一个网站或应用程序,并要添加搜索功能,但是想要完成搜索工作的创建是非常困难的。我们希望搜索解决方案要运行速度快,我们希望能有一个零配置和一个完全免费的搜索模式,我们希望能够简单地使用JSON通过HTTP来索引数据,我们希望我们的搜索服务器始终可用,我们希望能够从一台开始并扩展到数百台,我们要实时搜索,我们要简单的多租户,我们希望建立一个云的解决方案。因此我们利用Elasticsearch来解决所有这些问题及可能出现的更多其它问题。

下载elasticsearch-2.4.2.rar, 解压后运行其中 bin 目录的 elasticsearch.bat,可以看到如图所示的界面。
SpringBoot整合elasticsearch_第1张图片
elasticsearch 提供了一个可视化的客户端 kibana,下载后解压后运行 bin 目录下的 kibana.bat 。
SpringBoot整合elasticsearch_第2张图片
1.项目中增加pom文件中加入elasticsearch依赖

		
			org.springframework.boot
			spring-boot-starter-data-elasticsearch
		

2.为配置文件在最后加上 es 相关配置

spring.data.elasticsearch.cluster-nodes = 127.0.0.1:9300

3.新建一个商品实体类Product
其中需要注意:
indexName:索引名称 可以理解为数据库名 必须为小写 不然会报org.elasticsearch.indices.InvalidIndexNameException异常
type:类型 可以理解为表名

package com.zgw.tmall.pojo;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.springframework.data.elasticsearch.annotations.Document;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
import java.util.List;

/**
 * Created by Zhaogw&Lss on 2018/11/6.
 */
@Entity
@Table(name = "product")
@JsonIgnoreProperties({"handler","hibernateLazyInitializer"})
@Document(indexName = "tmall_springboot",type = "product")
public class Product implements Serializable{

    private static final long serialVersionUID = 6967408083333555121L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    int id;

    @ManyToOne
    @JoinColumn(name = "cid")
    private Category category;

    //如果既没有指明 关联到哪个Column,又没有明确要用@Transient忽略,那么就会自动关联到表对应的同名字段
    private String name;
    private String subTitle;
    private float originalPrice;
    private float promotePrice;
    private int stock;
    private Date createDate;


    @Transient
    private ProductImage firstProductImage;

    public List getProductSingleImages() {
        return productSingleImages;
    }

    public void setProductSingleImages(List productSingleImages) {
        this.productSingleImages = productSingleImages;
    }

    public List getProductDetailImages() {
        return productDetailImages;
    }

    public void setProductDetailImages(List productDetailImages) {
        this.productDetailImages = productDetailImages;
    }

    public int getReviewCount() {
        return reviewCount;
    }

    public void setReviewCount(int reviewCount) {
        this.reviewCount = reviewCount;
    }

    public int getSaleCount() {
        return saleCount;
    }

    public void setSaleCount(int saleCount) {
        this.saleCount = saleCount;
    }

    @Transient
    private List productSingleImages;
    @Transient
    private List productDetailImages;
    @Transient
    private int reviewCount;
    @Transient
    private int saleCount;

    public ProductImage getFirstProductImage() {
        return firstProductImage;
    }

    public void setFirstProductImage(ProductImage firstProductImage) {
        this.firstProductImage = firstProductImage;
    }

    public int getId() {
        return id;
    }

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

    public Category getCategory() {
        return category;
    }

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

    public String getName() {
        return name;
    }

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

    public String getSubTitle() {
        return subTitle;
    }

    public void setSubTitle(String subTitle) {
        this.subTitle = subTitle;
    }

    public float getOriginalPrice() {
        return originalPrice;
    }

    public void setOriginalPrice(float originalPrice) {
        this.originalPrice = originalPrice;
    }

    public float getPromotePrice() {
        return promotePrice;
    }

    public void setPromotePrice(float promotePrice) {
        this.promotePrice = promotePrice;
    }

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }

    @Override
    public String toString() {
        return "Product{" +
                "id=" + id +
                ", category=" + category +
                ", name='" + name + '\'' +
                ", subTitle='" + subTitle + '\'' +
                ", originalPrice=" + originalPrice +
                ", promotePrice=" + promotePrice +
                ", stock=" + stock +
                ", createDate=" + createDate +
                '}';
    }
}

创建ProductESDAO,继承ElasticsearchRepository,代码如下

package com.zgw.tmall.es;

import com.zgw.tmall.pojo.Product;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

/**
 * Created by Zhaogw&Lss on 2019/6/20.
 */
public interface ProductESDAO extends ElasticsearchRepository {
}

ProductService 增加,删除,修改的时候,除了通过 ProductDAO 对数据库产生影响之外,还要通过 ProductESDAO 同步到 es.

package com.zgw.tmall.service;

import com.zgw.tmall.dao.ProductDAO;
import com.zgw.tmall.es.ProductESDAO;
import com.zgw.tmall.pojo.Category;
import com.zgw.tmall.pojo.Product;
import com.zgw.tmall.util.Page4Navigator;
import com.zgw.tmall.util.SpringContextUtil;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.data.elasticsearch.core.query.SearchQuery;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Zhaogw&Lss on 2018/11/7.
 */
@Service
@CacheConfig(cacheNames="products")
public class ProductService  {

    @Autowired ProductDAO productDAO;
    @Autowired ProductImageService productImageService;
    @Autowired CategoryService categoryService;
    @Autowired OrderItemService orderItemService;
    @Autowired ReviewService reviewService;
    @Autowired
    ProductESDAO productESDAO;

    @CacheEvict(allEntries=true)
    public void add(Product bean) {
        productDAO.save(bean);
        productESDAO.save(bean);
    }

    @CacheEvict(allEntries=true)
    public void delete(int id) {
        productDAO.delete(id);
        productESDAO.delete(id);
    }

    @Cacheable(key="'products-one-'+ #p0")
    public Product get(int id) {
        return productDAO.findOne(id);
    }

    @CacheEvict(allEntries=true)
    public void update(Product bean) {
        productDAO.save(bean);
        productESDAO.save(bean);
    }

    @Cacheable(key="'products-cid-'+#p0+'-page-'+#p1 + '-' + #p2 ")
    public Page4Navigator list(int cid, int start, int size,int navigatePages) {
        Category category = categoryService.get(cid);
        Sort sort = new Sort(Sort.Direction.DESC, "id");
        Pageable pageable = new PageRequest(start, size, sort);
        Page pageFromJPA =productDAO.findByCategory(category,pageable);
        return new Page4Navigator<>(pageFromJPA,navigatePages);
    }

    public void fill(List categorys) {
        for (Category category : categorys) {
            fill(category);
        }
    }

    @Cacheable(key="'products-cid-'+ #p0.id")
    public List listByCategory(Category category){
        return productDAO.findByCategoryOrderById(category);
    }

    public void fill(Category category) {
        ProductService productService = SpringContextUtil.getBean(ProductService.class);
        List products = productService.listByCategory(category);
        productImageService.setFirstProdutImages(products);
        category.setProducts(products);
    }

    public void fillByRow(List categorys) {
        int productNumberEachRow = 8;
        for (Category category : categorys) {
            List products =  category.getProducts();
            List> productsByRow =  new ArrayList<>();
            for (int i = 0; i < products.size(); i+=productNumberEachRow) {
                int size = i+productNumberEachRow;
                size= size>products.size()?products.size():size;
                List productsOfEachRow =products.subList(i, size);
                productsByRow.add(productsOfEachRow);
            }
            category.setProductsByRow(productsByRow);
        }
    }

    public void setSaleAndReviewNumber(Product product) {
        int saleCount = orderItemService.getSaleCount(product);
        product.setSaleCount(saleCount);

        int reviewCount = reviewService.getCount(product);
        product.setReviewCount(reviewCount);

    }

    public void setSaleAndReviewNumber(List products) {
        for (Product product : products)
            setSaleAndReviewNumber(product);
    }
//查询的修改。 以前查询是模糊查询,现在通过 ProductESDAO 到 elasticsearch 中进行查询了。
    public List search(String keyword, int start, int size) {
        initDatabase2ES();
        FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery()
                .add(QueryBuilders.matchPhraseQuery("name", keyword),
                        ScoreFunctionBuilders.weightFactorFunction(100))
                .scoreMode("sum")
                .setMinScore(10);
        Sort sort = new Sort(Sort.Direction.DESC, "id");
        Pageable pageable = new PageRequest(start, size, sort);
         //es搜索默认第一页页码是0
        SearchQuery searchQuery = new NativeSearchQueryBuilder()
                .withPageable(pageable)
                .withQuery(functionScoreQueryBuilder).build();
        Page page = productESDAO.search(searchQuery);
        return page.getContent();
    }
   /** 初始化数据到es. 因为数据刚开始都在数据库中,不在es中,所以刚开始查询,
    先看看es有没有数据,如果没有,就把数据从数据库同步到es中*/
    private void initDatabase2ES() {
        Pageable pageable = new PageRequest(0, 5);
        Page page =productESDAO.findAll(pageable);
        if(page.getContent().isEmpty()) {
            List products= productDAO.findAll();
            for (Product product : products) {
                productESDAO.save(product);
            }
        }
    }
}


启动项目测试:搜索关键字‘车’显示如下内容,一共显示十一条信息。
SpringBoot整合elasticsearch_第3张图片
根据控制台日志会发现第一次查询会执行 sql语句,而进行第二次搜索‘车’,以后再查询,就不会执行 sql 语句了。

也可以通过客户端访问:http://127.0.0.1:5601
通过搜索车关键字:一共显示十一条信息
SpringBoot整合elasticsearch_第4张图片

ok,SpringBoot整合Spring Data Elasticsearch到此完结
要是还有不太明白的地方请留言,评论必回
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