https://www.cnblogs.com/a-du/p/7196828.html
一、拼音分词的应用
拼音分词在日常生活中其实很常见,也许你每天都在用。打开淘宝看一看吧,输入拼音”zhonghua”,下面会有包含”zhonghua”对应的中文”中华”的商品的提示:
拼音分词是根据输入的拼音提示对应的中文,通过拼音分词提升搜索体验、加快搜索速度。下面介绍如何在Elasticsearch 5.1.1中配置和实现pinyin+iK分词。
二、IK分词器下载与安装
关于IK分词器的介绍不再多少,一言以蔽之,IK分词是目前使用非常广泛分词效果比较好的中文分词器。做ES开发的,中文分词十有八九使用的都是IK分词器。
下载地址:https://github.com/medcl/elasticsearch-analysis-ik
配置之前关闭elasticsearch,配置完成以后再重启。
IK的版本要和当前ES的版本一致,README中有说明。我使用的是ES是5.1.1,IK的版本为5.1.1(你也许会奇怪为什么IK上一个版本是1.X,下一个版本一下升到5.X?是因为Elastic官方为了统一版本号,之前es的版本是2.x,logstash的版本是2.x,同时Kibana的版本是4.x,ik的版本是1.x,这样版本很混乱。5.0之后,统一版本号,这样你使用5.1.1的es,其它软件的版本也使用5.1.1就好了)。
下载之后进入到elasticsearch-analysis-pinyin-master目录,mvn打包(没有安装maven的自行安装),运行命令:
mvn package
打包成功以后,会生成一个target文件夹,在elasticsearch-analysis-ik-master/target/releases目录下,找到elasticsearch-analysis-ik-5.1.1.zip,这就是我们需要的安装文件。解压elasticsearch-analysis-ik-5.1.1.zip,得到下面内容:
commons-codec-1.9.jar commons-logging-1.2.jar config elasticsearch-analysis-ik-5.1.1.jar httpclient-4.5.2.jar httpcore-4.4.4.jar plugin-descriptor.properties
然后在elasticsearch-5.1.1/plugins目录下新建一个文件夹ik,把elasticsearch-analysis-ik-5.1.1.zip解压后的文件拷贝到elasticsearch-5.1.1/plugins/ik目录下.截图方便理解。
三、pinyin分词器下载与安装
pinyin分词器的下载地址:
https://github.com/medcl/elasticsearch-analysis-pinyin
安装过程和IK一样,下载、打包、加入ES。这里不在重复上述步骤,给出最后配置截图
四、分词测试
IK和pinyin分词配置完成以后,重启ES。如果重启过程中ES报错,说明安装有错误,没有报错说明配置成功。
4.1 IK分词测试
创建一个索引:
curl -XPUT "http://localhost:9200/index"
测试分词效果:
curl -XPOST "http://localhost:9200/index/_analyze?analyzer=ik_max_word&text=中华人民共和国"
分词结果:
{ "tokens": [{ "token": "中华人民共和国", "start_offset": 0, "end_offset": 7, "type": "CN_WORD", "position": 0 }, { "token": "中华人民", "start_offset": 0, "end_offset": 4, "type": "CN_WORD", "position": 1 }, { "token": "中华", "start_offset": 0, "end_offset": 2, "type": "CN_WORD", "position": 2 }, { "token": "华人", "start_offset": 1, "end_offset": 3, "type": "CN_WORD", "position": 3 }, { "token": "人民共和国", "start_offset": 2, "end_offset": 7, "type": "CN_WORD", "position": 4 }, { "token": "人民", "start_offset": 2, "end_offset": 4, "type": "CN_WORD", "position": 5 }, { "token": "共和国", "start_offset": 4, "end_offset": 7, "type": "CN_WORD", "position": 6 }, { "token": "共和", "start_offset": 4, "end_offset": 6, "type": "CN_WORD", "position": 7 }, { "token": "国", "start_offset": 6, "end_offset": 7, "type": "CN_CHAR", "position": 8 }, { "token": "国歌", "start_offset": 7, "end_offset": 9, "type": "CN_WORD", "position": 9 }]
}
使用ik_smart分词:
curl -XPOST "http://localhost:9200/index/_analyze?analyzer=ik_smart&text=中华人民共和国"
分词结果:
{ "tokens": [{ "token": "中华人民共和国", "start_offset": 0, "end_offset": 7, "type": "CN_WORD", "position": 0 }, { "token": "国歌", "start_offset": 7, "end_offset": 9, "type": "CN_WORD", "position": 1 }]
}
截图方便理解:
4.2拼音分词测试
测试拼音分词:
curl -XPOST "http://localhost:9200/index/_analyze?analyzer=pinyin&text=张学友"
分词结果:
{ "tokens": [{ "token": "zhang", "start_offset": 0, "end_offset": 1, "type": "word", "position": 0 }, { "token": "xue", "start_offset": 1, "end_offset": 2, "type": "word", "position": 1 }, { "token": "you", "start_offset": 2, "end_offset": 3, "type": "word", "position": 2 }, { "token": "zxy", "start_offset": 0, "end_offset": 3, "type": "word", "position": 3 }]
}
五、IK+pinyin分词配置
5.1创建索引与分析器设置
创建一个索引,并设置index分析器相关属性:
curl -XPUT "http://localhost:9200/medcl/" -d' { "index": { "analysis": { "analyzer": { "ik_pinyin_analyzer": { "type": "custom", "tokenizer": "ik_smart", "filter": ["my_pinyin", "word_delimiter"]
}
}, "filter": { "my_pinyin": { "type": "pinyin", "first_letter": "prefix", "padding_char": " " }
}
}
}
}'
创建一个type并设置mapping:
curl -XPOST http://localhost:9200/medcl/folks/_mapping -d' { "folks": { "properties": { "name": { "type": "keyword", "fields": { "pinyin": { "type": "text", "store": "no", "term_vector": "with_positions_offsets", "analyzer": "ik_pinyin_analyzer", "boost": 10 }
}
}
}
}
}'
5.2索引测试文档
索引2份测试文档。
文档1:
curl -XPOST http://localhost:9200/medcl/folks/andy -d'{"name":"刘德华"}'
文档2:
curl -XPOST http://localhost:9200/medcl/folks/tina -d'{"name":"中华人民共和国国歌"}'
5.3测试(1)拼音分词
下面四条命命令都可以匹配”刘德华”
curl -XPOST "http://localhost:9200/medcl/folks/_search?q=name.pinyin:liu"
curl -XPOST "http://localhost:9200/medcl/folks/_search?q=name.pinyin:de"
curl -XPOST "http://localhost:9200/medcl/folks/_search?q=name.pinyin:hua"
curl -XPOST "http://localhost:9200/medcl/folks/_search?q=name.pinyin:ldh"
5.4测试(2)IK分词测试
curl -XPOST "http://localhost:9200/medcl/_search?pretty" -d' { "query": { "match": { "name.pinyin": "国歌" }
}, "highlight": { "fields": { "name.pinyin": {}
}
}
}'
返回结果:
{ "took" : 2, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }, "hits" : { "total" : 1, "max_score" : 16.698704, "hits" : [
{ "_index" : "medcl", "_type" : "folks", "_id" : "tina", "_score" : 16.698704, "_source" : { "name" : "中华人民共和国国歌" }, "highlight" : { "name.pinyin" : [ "<em>中华人民共和国</em><em>国歌</em>" ]
}
}
]
}
}
说明IK分词器起到了效果。
5.3测试(4)pinyin+ik分词测试:
curl -XPOST "http://localhost:9200/medcl/_search?pretty" -d' { "query": { "match": { "name.pinyin": "zhonghua" }
}, "highlight": { "fields": { "name.pinyin": {}
}
}
}'
返回结果:
{ "took" : 3, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }, "hits" : { "total" : 2, "max_score" : 5.9814634, "hits" : [
{ "_index" : "medcl", "_type" : "folks", "_id" : "tina", "_score" : 5.9814634, "_source" : { "name" : "中华人民共和国国歌" }, "highlight" : { "name.pinyin" : [ "<em>中华人民共和国</em>国歌" ]
}
},
{ "_index" : "medcl", "_type" : "folks", "_id" : "andy", "_score" : 2.2534127, "_source" : { "name" : "刘德华" }, "highlight" : { "name.pinyin" : [ "<em>刘德华</em>" ]
}
}
]
}
}
截图如下:
使用pinyin分词以后,原始的字段搜索要加上.pinyin后缀,搜索原始字段没有返回结果:
六、参考资料
- https://github.com/medcl/elasticsearch-analysis-ik
- https://github.com/medcl/elasticsearch-analysis-pinyin
- https://my.oschina.net/xiaohui249/blog/214505