1.结构

image.png

索引：类似于mysql的数据库
类型：类似于mysql的表
文档：类似于mysql的一条记录
属性：类似于mysql的一条记录的某一列

文档：https://www.elastic.co/guide/cn/elasticsearch/guide/current/index.html

2. Spring Boot使用

两种方式操作ES

1. Jest：默认不生效
2. SpringData ElasticSearch

2.1 Jest方式

导包：

        <!--SpringBoot默认使用SpringData ElasticSearch模块进行操作，先注释掉-->
        <!--<dependency>-->
            <!--<groupId>org.springframework.boot</groupId>-->
            <!--<artifactId>spring-boot-starter-data-elasticsearch</artifactId>-->
        <!--</dependency>
        <!-- https://mvnrepository.com/artifact/io.searchbox/jest -->
        <dependency>
            <groupId>io.searchbox</groupId>
            <artifactId>jest</artifactId>
            <version>5.3.3</version>
        </dependency>

配置：

spring.elasticsearch.jest.uris=http://118.24.44.169:9200

使用：

bean:

public class Article {

    @JestId
    private Integer id;
    private String author;
    private String title;
    private String content;

    public Integer getId() {
        return id;
    }

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

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getTitle() {
        return title;
    }

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

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

保存：

    @Autowired
    JestClient jestClient;

    @Test
    public void contextLoads() {
        //1、给Es中索引（保存）一个文档；
        Article article = new Article();
        article.setId(1);
        article.setTitle("好消息");
        article.setAuthor("zhangsan");
        article.setContent("Hello World");

        //构建一个索引功能
        Index index = new Index.Builder(article).index("atguigu").type("news").build();

        try {
            //执行
            jestClient.execute(index);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

搜索：

    @Autowired
    JestClient jestClient;

    //测试搜索
    @Test
    public void search(){

        //查询表达式
        String json ="{\n" +
                "    \"query\" : {\n" +
                "        \"match\" : {\n" +
                "            \"content\" : \"hello\"\n" +
                "        }\n" +
                "    }\n" +
                "}";

        //更多操作：https://github.com/searchbox-io/Jest/tree/master/jest
        //构建搜索功能
        Search search = new Search.Builder(json).addIndex("atguigu").addType("news").build();

        //执行
        try {
            SearchResult result = jestClient.execute(search);
            System.out.println(result.getJsonString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

2.2 SpringData 方式

导包：

        <!--SpringBoot默认使用SpringData ElasticSearch模块进行操作，打开-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.searchbox/jest -->
        <dependency>
            <groupId>io.searchbox</groupId>
            <artifactId>jest</artifactId>
            <version>5.3.3</version>
        </dependency>

配置：

spring.data.elasticsearch.cluster-name=elasticsearch
spring.data.elasticsearch.cluster-nodes=118.24.44.169:9300

版本适配：

image.png

•  如果版本不适配
  

•      1）、升级SpringBoot版本
  

•      2）、安装对应版本的ES
  

使用：
bean:@Document(indexName = "atguigu",type = "book")

package com.atguigu.elastic.bean;

import org.springframework.data.elasticsearch.annotations.Document;

@Document(indexName = "atguigu",type = "book")
public class Book {
    private Integer id;
    private String bookName;
    private String author;

    public Integer getId() {
        return id;
    }

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

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", bookName='" + bookName + '\'' +
                ", author='" + author + '\'' +
                '}';
    }
}

public interface BookRepository extends ElasticsearchRepository<Book,Integer(主键类型)> {
}

保存：

    @Autowired
    BookRepository bookRepository;

    @Test
    public void test02(){
        Book book = new Book();
        book.setId(1);
        book.setBookName("西游记");
        book.setAuthor("吴承恩");
        bookRepository.index(book);
    }

这个ElasticsearchRepository默认有一些增删改查的方法，也支持自定义方法

自定义方法

只需要写方法名，不需要写方法实现，方法名的名称要按照一定的规则命名

public interface BookRepository extends ElasticsearchRepository<Book,Integer> {

   //参照
   // https://docs.spring.io/spring-data/elasticsearch/docs/3.0.6.RELEASE/reference/html/
  public List<Book> findByBookNameLike(String bookName);

}

    @Test
    public void test02(){

        for (Book book : bookRepository.findByBookNameLike("游")) {
            System.out.println(book);
        }
    }