发布时间:2023-02-16 文章分类:编程知识 投稿人:赵颖 字号: 默认 | | 超大 打印

一、ElasticSearch概述

官网:https://www.elastic.co/cn/downloads/elasticsearch

Elaticsearch,简称为es,es是一个开源的高扩展分布式全文检索引擎,它可以近乎实时的存储检索数据;本身扩展性很好,可以扩展到上百台服务器,处理PB级别(大数据时代)的数据。es也使用java开发并使用Lucene作为其核心来实现所有索引和搜索的功能,但是它的目的通过简单的RESTful API来隐藏Lucene的复杂性,从而让全文搜索变得简单

据国际权威的数据库产品评测机构DB Engines的统计,在2016年1月,ElasticSearch已超过Solr等,成为排名第一的搜索引擎类应用

总结

1、es基本是开箱即用(解压就可以用!) ,非常简单。Solr安装略微复杂一丢丢!
2、Solr 利用Zookeeper进行分布式管理,而Elasticsearch自身带有分布式协调管理功能
3、Solr 支持更多格式的数据,比如JSON、XML、 CSV ,而Elasticsearch仅支持json文件格式
4、Solr 官方提供的功能更多,而Elasticsearch本身更注重于核心功能,高级功能多有第三方插件提供,例如图形化界面需要kibana友好支撑
5、Solr 查询快,但更新索引时慢(即插入删除慢) ,用于电商等查询多的应用;

6、Solr比较成熟,有一个更大,更成熟的用户、开发和贡献者社区,而Elasticsearch相对开发维护者较少,更新太快,学习使用成本较高。

二、ElasticSearch安装

Windows下安装

1、安装

下载地址:https://www.elastic.co/cn/downloads/

历史版本下载:https://www.elastic.co/cn/downloads/past-releases/

解压即可(尽量将ElasticSearch相关工具放在统一目录下)

2、熟悉目录

bin 启动文件目录
config 配置文件目录    
	1og4j2 日志配置文件    
	jvm.options java 虚拟机相关的配置(默认启动占1g内存,内容不够需要自己调整)    
	elasticsearch.ym1 elasticsearch 的配置文件! 默认9200端口!跨域!
1ib   相关jar包
modules 功能模块目录
plugins 插件目录    
	ik分词器

3、启动

bin目录下的elasticsearch.bat

访问地址: localhost:9200

{
  "name" : "TIANYH",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "IOHRCRK6TKibMGdNZq4YtA",
  "version" : {
    "number" : "7.6.1",
    "build_flavor" : "default",
    "build_type" : "zip",
    "build_hash" : "aa751e09be0a5072e8570670309b1f12348f023b",
    "build_date" : "2020-02-29T00:15:25.529771Z",
    "build_snapshot" : false,
    "lucene_version" : "8.4.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

安装可视化界面

elasticsearch-head

使用前提:需要安装nodejs

1、下载地址

https://github.com/mobz/elasticsearch-head

2、安装

解压即可(尽量将ElasticSearch相关工具放在统一目录下)

3、启动

cd elasticsearch-head
# 安装依赖npm install
# 启动npm run start# 
# 访问http://localhost:9100/

开启跨域(在elasticsearch解压目录config下elasticsearch.yml中添加)

# 开启跨域http.cors.enabled: true
# 所有人访问http.cors.allow-origin: "*"

重启elasticsearch

理解:

安装kibana

Kibana是一个针对ElasticSearch的开源分析及可视化平台,用来搜索、查看交互存储在Elasticsearch索引中的数据。使用Kibana ,可以通过各种图表进行高级数据分析及展示。Kibana让海量数据更容易理解。它操作简单,基于浏览器的用户界面可以快速创建仪表板( dashboard )实时显示Elasticsearch查询动态。设置Kibana非常简单。无需编码或者额外的基础架构,几分钟内就可以完成Kibana安装并启动Elasticsearch索引监测。

1、下载地址:

下载的版本需要与ElasticSearch版本对应

https://www.elastic.co/cn/downloads/

历史版本下载:https://www.elastic.co/cn/downloads/past-releases/

2、安装

解压即可(尽量将ElasticSearch相关工具放在统一目录下)

3、启动

bin目录下的kibanan.bat

访问地址: localhost:5601

4、kibana汉化

编辑器打开kibana解压目录/config/kibana.yml,添加

i18n.locale: "zh-CN"

重启kibana

了解ELK

收集清洗数据(Logstash) ==> 搜索、存储(ElasticSearch) ==> 展示(Kibana)

三、ElasticSearch核心概念

概述

1、索引(ElasticSearch)

2、字段类型(映射)

3、文档

4、分片(Lucene索引,倒排索引)

ElasticSearch是面向文档,关系行数据库和ElasticSearch客观对比!一切都是JSON!

Relational DB ElasticSearch
数据库(database) 索引(indices)
表(tables) types <慢慢会被弃用!>
行(rows) documents
字段(columns) fields

elasticsearch(集群)中可以包含多个索引(数据库) ,每个索引中可以包含多个类型(表) ,每个类型下又包含多个文档(行) ,每个文档中又包含多个字段(列)

物理设计:

elasticsearch在后台把每个索引划分成多个分片,每分分片可以在集群中的不同服务器间迁移

一个人就是一个集群! ,即启动的ElasticSearch服务,默认就是一个集群,且默认集群名为elasticsearch

逻辑设计:

一个索引类型中,包含多个文档,比如说文档1,文档2。当我们索引一篇文档时,可以通过这样的顺序找到它:索引 => 类型 => 文档ID ,通过这个组合我们就能索引到某个具体的文档。 注意:ID不必是整数,实际上它是个字符串。

文档(”行“)

之前说elasticsearch是面向文档的,那么就意味着索引和搜索数据的最小单位是文档,elasticsearch中,文档有几个重要属性:

尽管我们可以随意的新增或者忽略某个字段,但是,每个字段的类型非常重要,比如一个年龄字段类型,可以是字符串也可以是整形。因为elasticsearch会保存字段和类型之间的映射及其他的设置。这种映射具体到每个映射的每种类型,这也是为什么在elasticsearch中,类型有时候也称为映射类型。

类型(“表”)

类型是文档的逻辑容器,就像关系型数据库一样,表格是行的容器。类型中对于字段的定义称为映射,比如name映射为字符串类型。我们说文档是无模式的,它们不需要拥有映射中所定义的所有字段,比如新增一个字段,那么elasticsearch是怎么做的呢?

索引(“库”)

索引是映射类型的容器, elasticsearch中的索引是一个非常大的文档集合。 索引存储了映射类型的字段和其他设置。然后它们被存储到了各个分片上了。我们来研究下分片是如何工作的。

一个集群至少有一个节点,而一个节点就是一个elasricsearch进程,节点可以有多个索引默认的,如果你创建索引,那么索引将会有个5个分片(primary shard ,又称主分片)构成的,每一个主分片会有一个副本(replica shard,又称复制分片)

有3个节点的集群,可以看到主分片和对应的复制分片都不会在同一个节点内,这样有利于某个节点挂掉了,数据也不至于失。实际上,一个分片是一个Lucene索引(一个ElasticSearch索引包含多个Lucene索引一个包含倒排索引的文件目录,倒排索引的结构使得elasticsearch在不扫描全部文档的情况下,就能告诉你哪些文档包含特定的关键字。不过,等等,倒排索引是什么鬼?

倒排索引(Lucene索引底层)

简单说就是 按(文章关键字,对应的文档<0个或多个>)形式建立索引,根据关键字就可直接查询对应的文档(含关键字的),无需查询每一个文档,如下图

四、IK分词器(elasticsearch插件)

IK分词器:中文分词器

分词:即把一段中文或者别的划分成一个个的关键字,我们在搜索时候会把自己的信息进行分词,会把数据库中或者索引库中的数据进行分词,然后进行一一个匹配操作,默认的中文分词是将每个字看成一个词不使用用IK分词器的情况下),比如“我爱狂神”会被分为”我”,”爱”,”狂”,”神” ,这显然是不符合要求的,所以我们需要安装中文分词器ik来解决这个问题。

IK提供了两个分词算法: ik_smartik_max_word ,其中ik_smart最少切分, ik_max_word最细粒度划分!

1、下载

版本要与ElasticSearch版本对应

下载地址:https://github.com/medcl/elasticsearch-analysis-ik/releases

2、安装

ik文件夹是自己创建的

加压即可(但是我们需要解压到ElasticSearch的plugins目录ik文件夹下)

4、使用 ElasticSearch安装补录/bin/elasticsearch-plugin 可以查看插件

E:\ElasticSearch\elasticsearch-7.6.1\bin>elasticsearch-plugin list

5、使用kibana测试

ik_smart:最少切分

GET _analyze
{
  "analyzer": "ik_smart",
  "text": "白日依山尽黄河入海流"
}
{
  "tokens" : [
    {
      "token" : "白日",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "依",
      "start_offset" : 2,
      "end_offset" : 3,
      "type" : "CN_CHAR",
      "position" : 1
    },
    {
      "token" : "山",
      "start_offset" : 3,
      "end_offset" : 4,
      "type" : "CN_CHAR",
      "position" : 2
    },
    {
      "token" : "尽",
      "start_offset" : 4,
      "end_offset" : 5,
      "type" : "CN_CHAR",
      "position" : 3
    },
    {
      "token" : "黄河",
      "start_offset" : 5,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 4
    },
    {
      "token" : "入海流",
      "start_offset" : 7,
      "end_offset" : 10,
      "type" : "CN_WORD",
      "position" : 5
    }
  ]
}

ik_max_word:最细粒度划分(穷尽词库的可能)

GET _analyze
{
  "analyzer": "ik_max_word",
  "text": "白日依山尽黄河入海流"
}
{
  "tokens" : [
    {
      "token" : "白日",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "依",
      "start_offset" : 2,
      "end_offset" : 3,
      "type" : "CN_CHAR",
      "position" : 1
    },
    {
      "token" : "山",
      "start_offset" : 3,
      "end_offset" : 4,
      "type" : "CN_CHAR",
      "position" : 2
    },
    {
      "token" : "尽",
      "start_offset" : 4,
      "end_offset" : 5,
      "type" : "CN_CHAR",
      "position" : 3
    },
    {
      "token" : "黄河",
      "start_offset" : 5,
      "end_offset" : 7,
      "type" : "CN_WORD",
      "position" : 4
    },
    {
      "token" : "入海流",
      "start_offset" : 7,
      "end_offset" : 10,
      "type" : "CN_WORD",
      "position" : 5
    },
    {
      "token" : "入海",
      "start_offset" : 7,
      "end_offset" : 9,
      "type" : "CN_WORD",
      "position" : 6
    },
    {
      "token" : "海流",
      "start_offset" : 8,
      "end_offset" : 10,
      "type" : "CN_WORD",
      "position" : 7
    }
  ]
}

6、添加自定义的词添加到扩展字典中

elasticsearch目录/plugins/ik/config/IKAnalyzer.cfg.xml

打开 IKAnalyzer.cfg.xml 文件,扩展字典

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
	<comment>IK Analyzer 扩展配置</comment>
	<!--用户可以在这里配置自己的扩展字典 -->
	<entry key="ext_dict">my.dic</entry>
	 <!--用户可以在这里配置自己的扩展停止词字典-->
	<entry key="ext_stopwords"></entry>
	<!--用户可以在这里配置远程扩展字典 -->
	<!-- <entry key="remote_ext_dict">words_location</entry> -->
	<!--用户可以在这里配置远程扩展停止词字典-->
	<!-- <entry key="remote_ext_stopwords">words_location</entry> -->
</properties>

编写 my.dic

白日依山尽
黄河入海流
GET _analyze
{
  "analyzer": "ik_smart",
  "text": "白日依山尽黄河入海流"
}
{
  "tokens" : [
    {
      "token" : "白日依山尽",
      "start_offset" : 0,
      "end_offset" : 5,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "黄河入海流",
      "start_offset" : 5,
      "end_offset" : 10,
      "type" : "CN_WORD",
      "position" : 1
    }
  ]
}

五、Rest风格说明

一种软件架构风格,而不是标准,只是提供了一组设计原则和约束条件。它主要用于客户端和服务器交互类的软件。基于这个风格设计的软件可以更简洁更有层次更易于实现缓存等机制。

基本Rest命令说明:

method url地址 描述
PUT(创建,修改) localhost:9200/索引名称/类型名称/文档id 创建文档(指定文档id)
POST(创建) localhost:9200/索引名称/类型名称 创建文档(随机文档id)
POST(修改) localhost:9200/索引名称/类型名称/文档id/_update 修改文档
DELETE(删除) localhost:9200/索引名称/类型名称/文档id 删除文档
GET(查询) localhost:9200/索引名称/类型名称/文档id 查询文档通过文档ID
POST(查询) localhost:9200/索引名称/类型名称/文档id/_search 查询所有数据

测试

1、创建一个索引,添加

PUT /test/type/1
{
  "name": "测试",
  "age": 18
}
{
  "_index" : "test",
  "_type" : "type",
  "_id" : "1",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 0,
  "_primary_term" : 1
}

2、字段数据类型

3、指定字段的类型(使用PUT)

类似于建库(建立索引和字段对应类型),也可看做规则的建立

PUT /test2
{
  "mappings": {
    "properties": {
      "name": {
        "type": "text"
      },
      "age":{
        "type": "long"
      },
      "birthday":{
        "type": "date"
      }
    }
  }
}
{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "test2"
}

4、获取3建立的规则

GET test2
{
  "test2" : {
    "aliases" : { },
    "mappings" : {
      "properties" : {
        "age" : {
          "type" : "long"
        },
        "birthday" : {
          "type" : "date"
        },
        "name" : {
          "type" : "text"
        }
      }
    },
    "settings" : {
      "index" : {
        "creation_date" : "1676438148562",
        "number_of_shards" : "1",
        "number_of_replicas" : "1",
        "uuid" : "d-qUkOZKQJKzd68KHiN_pw",
        "version" : {
          "created" : "7060199"
        },
        "provided_name" : "test2"
      }
    }
  }
}

5、获取默认信息

_doc 默认类型(default type),type 在未来的版本中会逐渐弃用,因此产生一个默认类型进行代替

PUT /test3/_doc/1
{
  "name": "黄河",
  "age": 18
}
{
  "_index" : "test3",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 0,
  "_primary_term" : 1
}
GET test3
{
  "test3" : {
    "aliases" : { },
    "mappings" : {
      "properties" : {
        "age" : {
          "type" : "long"
        },
        "name" : {
          "type" : "text",
          "fields" : {
            "keyword" : {
              "type" : "keyword",
              "ignore_above" : 256
            }
          }
        }
      }
    },
    "settings" : {
      "index" : {
        "creation_date" : "1676438576004",
        "number_of_shards" : "1",
        "number_of_replicas" : "1",
        "uuid" : "QmHErZuzSvmczgtgyzC7oA",
        "version" : {
          "created" : "7060199"
        },
        "provided_name" : "test3"
      }
    }
  }
}

如果自己的文档字段没有被指定,那么ElasticSearch就会给我们默认配置字段类型

扩展:通过GET _cat/ 可以获取ElasticSearch的当前的很多信息!

=^.^=
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates

6、修改

两种方案

①旧的(使用put覆盖原来的值)

PUT /test/type/1
{
  "name": "测试",
  "age": 19
}
GET /test/_doc/1
{
  "_index" : "test",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 2,
  "_seq_no" : 1,
  "_primary_term" : 1,
  "found" : true,
  "_source" : {
    "name" : "测试",
    "age" : 19
  }
}
PUT /test/type/1
{
  "age": 20
}
GET /test/_doc/1
{
  "_index" : "test",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 3,
  "_seq_no" : 2,
  "_primary_term" : 1,
  "found" : true,
  "_source" : {
    "age" : 20
  }
}

②新的(使用post的update)

POST /test/_doc/1/_update
{
  "doc":{
    "age":11
  }
}
GET /test/_doc/1
{
  "_index" : "test",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 5,
  "_seq_no" : 4,
  "_primary_term" : 1,
  "found" : true,
  "_source" : {
    "name" : "测试",
    "age" : 11
  }
}

7、删除

DELETE /test
{
  "acknowledged" : true
}

8、查询(简单条件)

GET /test/_doc/_search?q=age:19
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "测试",
          "age" : 19
        }
      }
    ]
  }
}

9、复杂查询

①查询匹配
GET /test/_doc/_search
{
}
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 5,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "测试",
          "age" : 19
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : 1.0,
        "_source" : {
          "name" : "小李",
          "age" : 19
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 1.0,
        "_source" : {
          "name" : "小张",
          "age" : 18
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 1.0,
        "_source" : {
          "name" : "小明",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "5",
        "_score" : 1.0,
        "_source" : {
          "name" : "明明",
          "age" : 16
        }
      }
    ]
  }
}
GET /test/_doc/_search
{
  "query":{
    "match":{
      "name":"明"
    }
  },
  "_source":["age","name"],
  "sort":[{"age":{"order":"asc"}}],
  "from":0,
  "size":20
}
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : null,
        "_source" : {
          "name" : "小明",
          "age" : 16
        },
        "sort" : [
          16
        ]
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "5",
        "_score" : null,
        "_source" : {
          "name" : "明明",
          "age" : 16
        },
        "sort" : [
          16
        ]
      }
    ]
  }
}
②多条件查询(bool)
GET /test/_doc/_search
{
  "query":{
    "bool":{
      "must":[{"match":{"age":16}},{"match":{"name":"小"}}],
      "filter":{
        "range":{
        "age":{
          "gte":15,
          "lte":17
          }
        }
      }
    }
  } 
}
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : 1.2940125,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 1.2940125,
        "_source" : {
          "name" : "小明",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "6",
        "_score" : 1.2940125,
        "_source" : {
          "name" : "小黄",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "7",
        "_score" : 1.2940125,
        "_source" : {
          "name" : "小黑",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "9",
        "_score" : 1.2940125,
        "_source" : {
          "name" : "小花",
          "age" : 16
        }
      }
    ]
  }
}
③匹配数组
GET /test/_doc/_search
{
  "query":{
    "match":{
      "name":"明 黑"
    }
  }
}
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : 1.9388659,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "7",
        "_score" : 1.9388659,
        "_source" : {
          "name" : "小黑",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "5",
        "_score" : 1.4651942,
        "_source" : {
          "name" : "明明",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 1.0729234,
        "_source" : {
          "name" : "小明",
          "age" : 16
        }
      }
    ]
  }
}
④精确查询
GET /test/_doc/_search
{
  "query":{
    "term":{
      "age":16
    }
  }
}
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 5,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 1.0,
        "_source" : {
          "name" : "小明",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "5",
        "_score" : 1.0,
        "_source" : {
          "name" : "明明",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "6",
        "_score" : 1.0,
        "_source" : {
          "name" : "小黄",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "7",
        "_score" : 1.0,
        "_source" : {
          "name" : "小黑",
          "age" : 16
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "9",
        "_score" : 1.0,
        "_source" : {
          "name" : "小花",
          "age" : 16
        }
      }
    ]
  }
}
⑤text和keyword
// 设置索引类型
PUT /test2
{
  "mappings": {
    "properties": {
      "text":{
        "type":"text"
      },
      "keyword":{
        "type":"keyword"
      }
    }
  }
}
// 设置字段数据
PUT /test2/_doc/1
{
  "text":"测试keyword和text是否支持分词",
  "keyword":"测试keyword和text是否支持分词"
}
GET /test2/_doc/_search
{
  "query":{
   "match":{
      "text":"测试"
   }
  }
}
{
  "took" : 426,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 0.5753642,
    "hits" : [
      {
        "_index" : "test2",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 0.5753642,
        "_source" : {
          "text" : "测试keyword和text是否支持分词",
          "keyword" : "测试keyword和text是否支持分词"
        }
      }
    ]
  }
}
GET /test2/_doc/_search
{
  "query":{
   "match":{
      "keyword":"测试"
   }
  }
}
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  }
}
GET _analyze
{
  "analyzer": "keyword",
  "text": ["白日依山尽"]
}
{
  "tokens" : [
    {
      "token" : "白日依山尽",
      "start_offset" : 0,
      "end_offset" : 5,
      "type" : "word",
      "position" : 0
    }
  ]
}
GET _analyze
{
  "analyzer": "standard",
    "text": ["白日依山尽"]
}
{
  "tokens" : [
    {
      "token" : "白",
      "start_offset" : 0,
      "end_offset" : 1,
      "type" : "<IDEOGRAPHIC>",
      "position" : 0
    },
    {
      "token" : "日",
      "start_offset" : 1,
      "end_offset" : 2,
      "type" : "<IDEOGRAPHIC>",
      "position" : 1
    },
    {
      "token" : "依",
      "start_offset" : 2,
      "end_offset" : 3,
      "type" : "<IDEOGRAPHIC>",
      "position" : 2
    },
    {
      "token" : "山",
      "start_offset" : 3,
      "end_offset" : 4,
      "type" : "<IDEOGRAPHIC>",
      "position" : 3
    },
    {
      "token" : "尽",
      "start_offset" : 4,
      "end_offset" : 5,
      "type" : "<IDEOGRAPHIC>",
      "position" : 4
    }
  ]
}
GET _analyze
{
  "analyzer": "ik_max_word",
    "text": ["白日依山尽"]
}
{
  "tokens" : [
    {
      "token" : "白日依山尽",
      "start_offset" : 0,
      "end_offset" : 5,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "白日",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "CN_WORD",
      "position" : 1
    },
    {
      "token" : "依",
      "start_offset" : 2,
      "end_offset" : 3,
      "type" : "CN_CHAR",
      "position" : 2
    },
    {
      "token" : "山",
      "start_offset" : 3,
      "end_offset" : 4,
      "type" : "CN_CHAR",
      "position" : 3
    },
    {
      "token" : "尽",
      "start_offset" : 4,
      "end_offset" : 5,
      "type" : "CN_CHAR",
      "position" : 4
    }
  ]
}
⑥高亮查询
GET /test/_doc/_search
{
    "query":{
        "match":{"name":"小"}
    },
    "highlight":{
      "fields":{
        "name":{}
      }
    }
}
{
  "took" : 89,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 6,
      "relation" : "eq"
    },
    "max_score" : 0.18681718,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小李",
          "age" : 19
        },
        "highlight" : {
          "name" : [
            "<em>小</em>李"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小张",
          "age" : 18
        },
        "highlight" : {
          "name" : [
            "<em>小</em>张"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小明",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<em>小</em>明"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "6",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小黄",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<em>小</em>黄"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "7",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小黑",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<em>小</em>黑"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "9",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小花",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<em>小</em>花"
          ]
        }
      }
    ]
  }
}
GET /test/_doc/_search
{
    "query":{
        "match":{"name":"小"}
    },
  "highlight": {
    "pre_tags": "<p class='key'>",
    "post_tags": "</p>", 
    "fields": {
      "name": {}
    }
  }
}
{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 6,
      "relation" : "eq"
    },
    "max_score" : 0.18681718,
    "hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小李",
          "age" : 19
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>李"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小张",
          "age" : 18
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>张"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "4",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小明",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>明"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "6",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小黄",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>黄"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "7",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小黑",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>黑"
          ]
        }
      },
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "9",
        "_score" : 0.18681718,
        "_source" : {
          "name" : "小花",
          "age" : 16
        },
        "highlight" : {
          "name" : [
            "<p class='key'>小</p>花"
          ]
        }
      }
    ]
  }
}

六、SpringBoot整合

1、导入依赖

导入elasticsearch

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

提前导入fastjson、lombok

<dependency>
    <groupId>com.alibaba</groupId>    
    <artifactId>fastjson</artifactId>    
    <version>1.2.70</version>
</dependency>
<!-- lombok需要安装插件 -->
<dependency>    
    <groupId>org.projectlombok</groupId>    
    <artifactId>lombok</artifactId>    
    <optional>true</optional>
</dependency>

2、创建并编写配置类

@Configuration
public class ElasticSearchConfig {
	// 注册 rest高级客户端
	@Bean
	public RestHighLevelClient restHighLevelClient(){
		RestHighLevelClient client = new RestHighLevelClient(
				RestClient.builder(
						new HttpHost("localhost",9200,"http")
				)
		);
		return client;
	}
}

3、创建并编写实体类

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {
	private static final long serialVersionUID = -3843548915035470817L;
	private String name;
	private Integer age;
}

4、测试

注入 RestHighLevelClient

    @Autowired
    public RestHighLevelClient restHighLevelClient;

索引的操作

1、索引的创建
    public void CreatIndex() throws IOException {
        CreateIndexRequest request = new CreateIndexRequest("test6");
        CreateIndexResponse response = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(response.isAcknowledged());
        System.out.println(response);
        restHighLevelClient.close();
        return ;
    }
2、索引的获取,并判断其是否存在
    public void IndexIsExists() throws IOException {
        GetIndexRequest request = new GetIndexRequest("test6");
        boolean exists = restHighLevelClient.indices().exists(request,RequestOptions.DEFAULT);
        System.out.println(exists);
        restHighLevelClient.close();
        return;
    }
3、索引的删除
    public void DeleteIndex() throws IOException {
        DeleteIndexRequest request = new DeleteIndexRequest("test6");
        AcknowledgedResponse response = restHighLevelClient.indices().delete(request,RequestOptions.DEFAULT);
        System.out.println(response.isAcknowledged());
        restHighLevelClient.close();
        return;
    }

文档的操作

1、文档的添加
	public void AddDocument() throws IOException {
		User user = new User("笑笑",25);
		IndexRequest request = new IndexRequest("test");
		request.id("16");
		request.timeout(TimeValue.timeValueMillis(1000));
		request.source(JSON.toJSONString(user),XContentType.JSON);
		IndexResponse response = restHighLevelClient.index(request,RequestOptions.DEFAULT);
		System.out.println(response.status());
		System.out.println(response);
		restHighLevelClient.close();
    	return;
	}
2、文档信息的获取
	public void GetDocument() throws IOException {
		GetRequest request = new GetRequest("test","1");
		GetResponse response = restHighLevelClient.get(request,RequestOptions.DEFAULT);
		System.out.println(response.getSourceAsString());
		restHighLevelClient.close();
		return;
	}
3、文档的获取,并判断其是否存在
	public void DocumentIsExists() throws IOException {
    	GetRequest request = new GetRequest("test","1111");
    	request.fetchSourceContext(new FetchSourceContext(false));
    	request.storedFields("_none_");
    	boolean exists = restHighLevelClient.exists(request,RequestOptions.DEFAULT);
    	System.out.println(exists);
    	restHighLevelClient.close();
    	return;
	}
4、文档的更新
	public void UpdateDocument() throws IOException {
		UpdateRequest request =  new UpdateRequest("test","16");
		User user = new User("黑黑",18);
		request.doc(JSON.toJSONString(user),XContentType.JSON);
		UpdateResponse response = restHighLevelClient.update(request,RequestOptions.DEFAULT);
		System.out.println(response.status());
		restHighLevelClient.close();
    	return;
	}
5、文档的删除
	public void DeleteDocument() throws Exception {
		DeleteRequest request = new DeleteRequest("test","1");
		request.timeout("1s");
		DeleteResponse response = restHighLevelClient.delete(request,RequestOptions.DEFAULT);
		System.out.println(response.status());
		restHighLevelClient.close();
	}
6、文档的查询
	public void Search() throws Exception {
		SearchRequest request = new SearchRequest("test");
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name","明");
//		MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery();
		searchSourceBuilder.highlighter(new HighlightBuilder());
		searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
		searchSourceBuilder.query(termQueryBuilder);
//		searchSourceBuilder.query(matchAllQueryBuilder);
		searchSourceBuilder.from(0);
		searchSourceBuilder.size(100);
		request.source(searchSourceBuilder);
		SearchResponse search = restHighLevelClient.search(request, RequestOptions.DEFAULT);
		SearchHits hits = search.getHits();
		System.out.println(JSON.toJSONString(hits));
		System.out.println("++++++++++++++++++++++++++++++++++++++++");
		for (SearchHit documentFields: hits.getHits()) {
			System.out.println(documentFields.getSourceAsMap());
		}
		restHighLevelClient.close();
	}
错误的批量添加数据
	public void test() throws Exception {
    	IndexRequest request = new IndexRequest("bulk");
    	request.source(JSON.toJSONString(new User("小1",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小2",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小3",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小4",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小5",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小6",12)),XContentType.JSON);
		request.source(JSON.toJSONString(new User("小7",12)),XContentType.JSON);
		IndexResponse indexResponse = restHighLevelClient.index(request,RequestOptions.DEFAULT);
		System.out.println(indexResponse.status());
		restHighLevelClient.close();
	}
7、批量添加数据
	public void testBullk() throws Exception {
		BulkRequest bulkRequest = new BulkRequest();
		bulkRequest.timeout("10s");
		ArrayList<User> users = new ArrayList<>();
		users.add(new User("小1",12));
		users.add(new User("小2",12));
		users.add(new User("小3",12));
		users.add(new User("小4",12));
		users.add(new User("小5",12));
		users.add(new User("小6",12));
		for (User user:users) {
			bulkRequest.add(new IndexRequest("bulk").source(JSON.toJSONString(user),XContentType.JSON));
		}
		BulkResponse response = restHighLevelClient.bulk(bulkRequest,RequestOptions.DEFAULT);
		System.out.println(response.status());
		restHighLevelClient.close();
	}

七、ElasticSearch实战

防京东商城搜索(高亮)

狂神--ElasticSearch

1、导入依赖

<dependencies>
    <!-- jsoup解析页面 -->
    <!-- 解析网页 爬视频可 研究tiko -->
    <dependency>
        <groupId>org.jsoup</groupId>
        <artifactId>jsoup</artifactId>
        <version>1.10.2</version>
    </dependency>
    <!-- fastjson -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.70</version>
    </dependency>
    <!-- ElasticSearch -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
    <!-- thymeleaf -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <!-- web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!-- devtools热部署 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <!--  -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>
    <!-- lombok 需要安装插件 -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <!-- test -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2、导入前端素材

ES资料地址:链接:https://pan.baidu.com/s/1qdvSk7SdVnlI8QzeK5gxaA
提取码:ldrh 

3、编写 application.preperties配置文件

# 更改端口,防止冲突
server.port=9999
# 关闭thymeleaf缓存
spring.thymeleaf.cache=false

4、测试controller和view

@Controller
public class DemoApi {
	@GetMapping({"/","index"})
	public String index(){
		return "index";
	}
}

5、编写service

ContentService

@Service
public class ContentService {
	@Autowired
	private RestHighLevelClient restHighLevelClient;
	// 1、解析数据放入 es 索引中
	public Boolean parseContent(String keyword) throws IOException {
		// 获取内容
		List<Content> contents = HtmlParseUtil.parseJD(keyword);
		// 内容放入 es 中
		BulkRequest bulkRequest = new BulkRequest();
		bulkRequest.timeout("2m"); // 可更具实际业务是指
		for (int i = 0; i < contents.size(); i++) {
			bulkRequest.add(
					new IndexRequest("jd_goods")
							.id(""+(i+1))
							.source(JSON.toJSONString(contents.get(i)), XContentType.JSON)
			);
		}
		BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
//		restHighLevelClient.close();
		return !bulk.hasFailures();
	}
	// 2、根据keyword分页查询结果
	public List<Map<String, Object>> search(String keyword, Integer pageIndex, Integer pageSize) throws IOException {
		if (pageIndex < 0){
			pageIndex = 0;
		}
		SearchRequest jd_goods = new SearchRequest("jd_goods");
		// 创建搜索源建造者对象
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		// 条件采用:精确查询 通过keyword查字段name
		TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", keyword);
		searchSourceBuilder.query(termQueryBuilder);
		searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));// 60s
		// 分页
		searchSourceBuilder.from(pageIndex);
		searchSourceBuilder.size(pageSize);
		// 高亮
		// ....
		// 搜索源放入搜索请求中
		jd_goods.source(searchSourceBuilder);
		// 执行查询,返回结果
		SearchResponse searchResponse = restHighLevelClient.search(jd_goods, RequestOptions.DEFAULT);
//		restHighLevelClient.close();
		// 解析结果
		SearchHits hits = searchResponse.getHits();
		List<Map<String,Object>> results = new ArrayList<>();
		for (SearchHit documentFields : hits.getHits()) {
			Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
			results.add(sourceAsMap);
		}
		// 返回查询的结果
		return results;
	}
	// 3、 在2的基础上进行高亮查询
	public List<Map<String, Object>> highlightSearch(String keyword, Integer pageIndex, Integer pageSize) throws IOException {
		SearchRequest searchRequest = new SearchRequest("jd_goods");
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
		// 精确查询,添加查询条件
		TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", keyword);
		searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
		searchSourceBuilder.query(termQueryBuilder);
		// 分页
		searchSourceBuilder.from(pageIndex);
		searchSourceBuilder.size(pageSize);
		// 高亮 =========
		HighlightBuilder highlightBuilder = new HighlightBuilder();
		highlightBuilder.field("name");
		highlightBuilder.preTags("<span>");
		highlightBuilder.postTags("</span>");
		searchSourceBuilder.highlighter(highlightBuilder);
		// 执行查询
		searchRequest.source(searchSourceBuilder);
		SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
		// 解析结果 ==========
		SearchHits hits = searchResponse.getHits();
		List<Map<String, Object>> results = new ArrayList<>();
		for (SearchHit documentFields : hits.getHits()) {
			// 使用新的字段值(高亮),覆盖旧的字段值
			Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
			// 高亮字段
			Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
			HighlightField name = highlightFields.get("name");
			// 替换
			if (name != null){
				Text[] fragments = name.fragments();
				StringBuilder new_name = new StringBuilder();
				for (Text text : fragments) {
					new_name.append(text);
				}
				sourceAsMap.put("name",new_name.toString());
			}
			results.add(sourceAsMap);
		}
		return results;
	}
}

6、编写controller

@Controller
public class DemoApi {
	@GetMapping({"/","index"})
	public String index(){
		return "index";
	}
	@Autowired
	private ContentService contentService;
	@ResponseBody
	@GetMapping("/parse/{keyword}")
	public Boolean parse(@PathVariable("keyword") String keyword) throws IOException {
		return contentService.parseContent(keyword);
	}
	@ResponseBody
	@GetMapping("/search/{keyword}/{pageIndex}/{pageSize}")
	public List<Map<String, Object>> parse(@PathVariable("keyword") String keyword,
										   @PathVariable("pageIndex") Integer pageIndex,
										   @PathVariable("pageSize") Integer pageSize) throws IOException {
		return contentService.search(keyword,pageIndex,pageSize);
	}
	@ResponseBody
	@GetMapping("/h_search/{keyword}/{pageIndex}/{pageSize}")
	public List<Map<String, Object>> highlightParse(@PathVariable("keyword") String keyword,
													@PathVariable("pageIndex") Integer pageIndex,
													@PathVariable("pageSize") Integer pageSize) throws IOException {
		return contentService.highlightSearch(keyword,pageIndex,pageSize);
	}
}

7、爬虫(jsoup)

HtmlParseUtil
public class HtmlParseUtil {
	public static void main(String[] args) throws IOException {
		/// 使用前需要联网
		// 请求url
		String url = "http://search.jd.com/search?keyword=java";
		// 1.解析网页(jsoup 解析返回的对象是浏览器Document对象)
		Document document = Jsoup.parse(new URL(url), 30000);
		// 使用document可以使用在js对document的所有操作
		// 2.获取元素(通过id)
		Element j_goodsList = document.getElementById("J_goodsList");
		// 3.获取J_goodsList ul 每一个 li
		Elements lis = j_goodsList.getElementsByTag("li");
		// 4.获取li下的 img、price、name
		for (Element li : lis) {
			String img = li.getElementsByTag("img").eq(0).attr("src");// 获取li下 第一张图片
			String name = li.getElementsByClass("p-name").eq(0).text();
			String price = li.getElementsByClass("p-price").eq(0).text();
			System.out.println("=======================");
			System.out.println("img : " + img);
			System.out.println("name : " + name);
			System.out.println("price : " + price);
		}
	}
	public static List<Content> parseJD(String keyword) throws IOException {
		/// 使用前需要联网
		// 请求url
		String url = "http://search.jd.com/search?keyword=" + keyword;
		// 1.解析网页(jsoup 解析返回的对象是浏览器Document对象)
		Document document = Jsoup.parse(new URL(url), 30000);
		// 使用document可以使用在js对document的所有操作
		// 2.获取元素(通过id)
		Element j_goodsList = document.getElementById("J_goodsList");
		// 3.获取J_goodsList ul 每一个 li
		Elements lis = j_goodsList.getElementsByTag("li");
//        System.out.println(lis);
		// 4.获取li下的 img、price、name
		// list存储所有li下的内容
		List<Content> contents = new ArrayList<Content>();
		for (Element li : lis) {
			// 由于网站图片使用懒加载,将src属性替换为data-lazy-img
			String img = li.getElementsByTag("img").eq(0).attr("data-lazy-img");// 获取li下 第一张图片
			String name = li.getElementsByClass("p-name").eq(0).text();
			String price = li.getElementsByClass("p-price").eq(0).text();
			// 封装为对象
			Content content = new Content(name,img,price);
			// 添加到list中
			contents.add(content);
		}
        System.out.println(contents);
		// 5.返回 list
		return contents;
	}
}
Content
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Content implements Serializable {
	private static final long serialVersionUID = -8049497962627482693L;
	private String name;
	private String img;
	private String price;
}

8、前后端分离

引入js
    <script src="https://cdn.bootcss.com/vue/2.5.2/vue.min.js"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
修改后的index.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="utf-8"/>
    <title>狂神说Java-ES仿京东实战</title>
    <link rel="stylesheet" th:href="https://www.cnblogs.com/When6/archive/2023/02/16/@{/css/style.css}"/>
    <script th:src="https://www.cnblogs.com/When6/archive/2023/02/16/@{/js/jquery.min.js}"></script>
</head>
<body class="pg">
<div class="page">
    <div id="app" class=" mallist tmall- page-not-market ">
        <!-- 头部搜索 -->
        <div id="header" class=" header-list-app">
            <div class="headerLayout">
                <div class="headerCon ">
                    <!-- Logo-->
                    <h1 id="mallLogo">
                        <img th:src="https://www.cnblogs.com/When6/archive/2023/02/16/@{/images/jdlogo.png}" alt="">
                    </h1>
                    <div class="header-extra">
                        <!--搜索-->
                        <div id="mallSearch" class="mall-search">
                            <form name="searchTop" class="mallSearch-form clearfix">
                                <fieldset>
                                    <legend>天猫搜索</legend>
                                    <div class="mallSearch-input clearfix">
                                        <div class="s-combobox" id="s-combobox-685">
                                            <div class="s-combobox-input-wrap">
                                                <input v-model="keyword"  type="text" autocomplete="off" id="mq"
                                                       class="s-combobox-input"  aria-haspopup="true">
                                            </div>
                                        </div>
                                        <button type="submit" @click.prevent="searchKey" id="searchbtn">搜索</button>
                                    </div>
                                </fieldset>
                            </form>
                            <ul class="relKeyTop">
                                <li><a>狂神说Java</a></li>
                                <li><a>狂神说前端</a></li>
                                <li><a>狂神说Linux</a></li>
                                <li><a>狂神说大数据</a></li>
                                <li><a>狂神聊理财</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <!-- 商品详情页面 -->
        <div id="content">
            <div class="main">
                <!-- 品牌分类 -->
                <form class="navAttrsForm">
                    <div class="attrs j_NavAttrs">
                        <div class="brandAttr j_nav_brand">
                            <div class="j_Brand attr">
                                <div class="attrKey">
                                    品牌
                                </div>
                                <div class="attrValues">
                                    <ul class="av-collapse row-2">
                                        <li><a href="#"> 狂神说 </a></li>
                                        <li><a href="#"> Java </a></li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </form>
                <!-- 排序规则 -->
                <div class="filter clearfix">
                    <a class="fSort fSort-cur">综合<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">人气<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">新品<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">销量<i class="f-ico-arrow-d"></i></a>
                    <a class="fSort">价格<i class="f-ico-triangle-mt"></i><i class="f-ico-triangle-mb"></i></a>
                </div>
                <!-- 商品详情 -->
                <div class="view grid-nosku" >
                    <div class="product" v-for="result in results">
                        <div class="product-iWrap">
                            <!--商品封面-->
                            <div class="productImg-wrap">
                                <a class="productImg">
                                    <img :src="https://www.cnblogs.com/When6/archive/2023/02/16/result.img">
                                </a>
                            </div>
                            <!--价格-->
                            <p class="productPrice">
                                <em v-text="result.price"></em>
                            </p>
                            <!--标题-->
                            <p class="productTitle">
                                <a v-html="result.name"></a>
                            </p>
                            <!-- 店铺名 -->
                            <div class="productShop">
                                <span>店铺: 狂神说Java </span>
                            </div>
                            <!-- 成交信息 -->
                            <p class="productStatus">
                                <span>月成交<em>999笔</em></span>
                                <span>评价 <a>3</a></span>
                            </p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>
<script th:src="https://www.cnblogs.com/When6/archive/2023/02/16/@{/js/vue.min.js}"></script>
<script th:src="https://www.cnblogs.com/When6/archive/2023/02/16/@{/js/axios.min.js}"></script>
<script>
    new Vue({
        el:"#app",
        data:{
            "keyword": '', // 搜索的关键字
            "results":[] // 后端返回的结果
        },
        methods:{
            searchKey(){
                var keyword = this.keyword;
                console.log(keyword);
                axios.get('h_search/'+keyword+'/0/20').then(response=>{
                    console.log(response.data);
                    this.results=response.data;
                })
            }
        }
    });
</script>
</body>
</html>

9、遗留问题

restHighLevelClient.close(); 引起java.lang.RuntimeException: Request execution cancelled 错误