ES学习和常用查询

1.使用ES的第一步，添加依赖

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

2.编写ES配置类EsConfig

package com.fh.config;

import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.elasticsearch.client.ClientConfiguration;
import org.springframework.data.elasticsearch.client.RestClients;
import org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;

/**
 * @ClassName: ElasticsearchConfig
 * @Author: 272126
 * @Date: 2021/4/24 8:58
 */
@Configuration
@EnableElasticsearchRepositories
public class ElasticsearchConfig extends AbstractElasticsearchConfiguration {

    @Override
    @Bean
    public RestHighLevelClient elasticsearchClient() {

        final ClientConfiguration clientConfiguration = ClientConfiguration.builder()
                .connectedTo("localhost:9200")//ip地址和es的端口号
                .build();

        return RestClients.create(clientConfiguration).rest();
    }
}

3.新建service接口 extents ElasticsearchRepository<User,String>

package com.fh.service;

import com.fh.entity.User;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Repository;

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

public interface UserService extends ElasticsearchRepository<User,String> {
}

4.测试增删改查

保存

@RequestMapping("Test")
public Object demo(User user) {
    try {
        User save = userService.save(user);
        return save;
    } catch (Exception e) {
        return e.getMessage();
    }
}

根据id查询
@RequestMapping("select2")
public Object demo4(String id){
    Optional<User> byId = userService.findById(id);
    User user = byId.get();
    return user;
}

根据id删除
@RequestMapping("select3")
public Object demo5(String id){
     userService.deleteById(id);
    return "success";
}

查询所有
@RequestMapping("select4")
public Object demo5(){
    Iterable<User> all = userService.findAll();
    all.forEach(itme->{
        System.out.println(itme.toString());
    });
    return null;
}

模糊查询
@RequestMapping("select")
public Object demo3(){
    BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    MatchPhraseQueryBuilder query = QueryBuilders.matchPhraseQuery("username", "王");
    MatchPhraseQueryBuilder age = QueryBuilders.matchPhraseQuery("age", 87);
    boolQueryBuilder.must(age);
    boolQueryBuilder.must(query);
    Iterable<User> search = userService.search(boolQueryBuilder);
    search.forEach(item->{
        String s = item.toString();
        System.out.println(s);
    });
    return null;
}