SpringBoot2.x系列教程55--NoSQL之SpringBoot整合ElasticSearch方式二

作者：一一哥

在上一节中，我带大家学习了在Spring Boot中整合Elastic Search的第一种方式，这种方式是直接利用TransportClient实现增删改查，有点麻烦。接下来我带大家利用ElasticSearchRepository实现第2种方式的增删改查。

一. Spring Boot整合Elastic Search

1. 创建web项目

我们按照之前的经验，创建一个web程序，并将之改造成Spring Boot项目，具体过程略。

2. 添加依赖

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

注意：因为我的elastic search 并不是6.5.x以上的最新版本，而是5.6.8版本，所以我这里使用的还是spring-boot-starter-data-elasticsearch的依赖包。

3. 创建application.yml文件

# Elasticsearch cluster name.
spring:
  data:
    elasticsearch:
      cluster-name: elasticsearch
      # Comma-separated list of cluster node addresses.
      cluster-nodes: localhost:9300
      # Whether to enable Elasticsearch repositories.
      repositories:
        enabled: true

4. 创建Book实体类

package com.yyg.boot.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
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;

/**
 *Document:
 * indexName = "book":索引名称,类似于mysql中的数据库;
 * type = "doc":文档类型,类似于mysql中的表;
 * shards = 5:分片数量
 * replicas = 1:副本
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@Document(indexName = "book", type = "doc", shards = 5, replicas = 1)
public class Book {

    @Id
    private String id;

    /**
     * 中文分词设置，前提是您的es已经安装了中文分词ik插件
     * 中文分词有两种形式：
     * ik_max_word：会将文本做最细粒度的拆分
     * ik_smart：会将文本做最粗粒度的拆分
     */
    @Field(type = FieldType.Text, analyzer = "ik_max_word",searchAnalyzer ="ik_max_word")
    private String title;

    private String author;

    private String postDate;

}

5. 创建Repository仓库类

package com.yyg.boot.repository;

import com.yyg.boot.entity.Book;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.annotations.Query;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;

public interface BookRepository extends ElasticsearchRepository<Book, String> {

    //Optional<Book> findById(String id);

    Page<Book> findByAuthor(String author, Pageable pageable);
    
}

6. 定义Service及其实现类

BookService接口

package com.yyg.boot.service;

import com.yyg.boot.entity.Book;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;

import java.util.List;
import java.util.Optional;

public interface BookService {

    Optional<Book> findById(String id);

    Book save(Book blog);

    void delete(Book blog);

    Optional<Book> findOne(String id);

    List<Book> findAll();

    Page<Book> findByAuthor(String author, PageRequest pageRequest);

}

BookServiceImpl实现类

package com.yyg.boot.service.impl;

import com.yyg.boot.entity.Book;
import com.yyg.boot.repository.BookRepository;
import com.yyg.boot.service.BookService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Optional;

@Slf4j
@Service
public class BookServiceImpl implements BookService {

    @Autowired
    private BookRepository bookRepository;

    @Override
    public Optional<Book> findById(String id) {
        return bookRepository.findById(id);
    }

    @Override
    public Book save(Book blog) {
        return bookRepository.save(blog);
    }

    @Override
    public void delete(Book blog) {
        bookRepository.delete(blog);
    }

    @Override
    public Optional<Book> findOne(String id) {
        return bookRepository.findById(id);
    }

    @Override
    public List<Book> findAll() {
        return (List<Book>) bookRepository.findAll();
    }

    @Override
    public Page<Book> findByAuthor(String author, PageRequest pageRequest) {
        return bookRepository.findByAuthor(author, pageRequest);
    }

}

7. 创建BookController接口

package com.yyg.boot.web;

import com.yyg.boot.entity.Book;
import com.yyg.boot.service.BookService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.Optional;

@Slf4j
@RestController
@RequestMapping("/book")
public class ElasticController {

    @Autowired
    private BookService bookService;

    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    /**
     * 创建索引
     */
    @PostMapping("/create")
    public void createIndex() {
        elasticsearchTemplate.createIndex(Book.class);
    }

    @PostMapping("/save")
    public void Save() {
        Book book = new Book("100", "ElasticSearch第2种实现方式", "一一哥", "2020-04-13");
        log.warn(book.toString());
        bookService.save(book);
    }

    @GetMapping("/id/{id}")
    public Book getBookById(@PathVariable String id) {
        Optional<Book> opt = bookService.findById(id);
        Book book = opt.get();
        log.warn(book.toString());
        return book;
    }

}

8. 创建Application入口类

package com.yyg.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ElasticSearchApplication {

    public static void main(String[] args) {
        SpringApplication.run(ElasticSearchApplication.class, args);
    }

}