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SpringBoot 使用JestClient操作Elastic

SpringBoot 使用JestClient操作Elastic

作者: dalaoyang | 来源:发表于2020-05-03 22:58 被阅读0次

    1.Jest介绍

    image

    操作Elasticsearch的客户端有很多,SpringBoot也提供了方式去操作,这里介绍另外一种方式去使用Elasticsearch --- JestClient

    JestClient是一款基于HTTP方式操作的Elasticsearch的客户端,支持同步和异步操作,同时也可以结合ElasticSearch的依赖进行操作Elasticsearch。

    支持多个版本的Elasticsearch,如下:

    Jest Version Elasticsearch Version
    >= 6.0.0 6
    >= 5.0.0 5
    >= 2.0.0 2
    0.1.0 - 1.0.0 1
    <= 0.0.6 < 1

    更多信息可以查看github,地址是:https://github.com/searchbox-io/Jest

    2.SpringBoot整合JestClient

    接下来介绍如何在SpringBoot中使用JestClient操作Elasticsearch。

    2.1 前置工作

    首先启动Elasticsearch,我这里是在本地启动的Elasticsearch,版本是6.8.2,为了方便查看数据,这里使用Elasticsearch-Head插件,如下图所示。

    image

    2.2 添加Jest依赖

    创建项目,在pom文件中加入Jest依赖(这里根据上面版本对应添加依赖),这里额外添加量了elasticsearch和lombok为了方便操作,如下:

    <?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <groupId>com.dalaoyang</groupId>
        <artifactId>springboot_jestclient</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springboot_jestclient</name>
        <description>springboot_jestclient</description>
    
        <properties>
            <java.version>1.8</java.version>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <spring-boot.version>2.2.6.RELEASE</spring-boot.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>io.searchbox</groupId>
                <artifactId>jest</artifactId>
                <version>6.3.1</version>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.10</version>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>6.8.2</version>
            </dependency>
        </dependencies>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>${spring-boot.version}</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                        <encoding>UTF-8</encoding>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>2.2.6.RELEASE</version>
                </plugin>
            </plugins>
        </build>
    
    </project>
    

    2.3 配置文件

    在配置文件中添加elasticsearch相关配置,其中uris配置Elasticsearch的HTTP端口,如本文添加的配置:

    spring.application.name=springboot_jestclient
    # 应用服务web访问端口
    server.port=8888
    
    spring.elasticsearch.rest.uris=http://localhost:9200
    spring.elasticsearch.jest.username=elastic
    spring.elasticsearch.jest.password=elastic
    

    到这里其实已经整合完成了,是不是非常简单?

    3.Elasticsearch基本操作

    接下介绍如何操作Elasticsearch,这里分别介绍如下几部分内容:

    • 索引文档
    • 索引类操作
    • 文档类操作
    • 查询操作

    3.1 文档实体

    这里创建一个Book文档做为示例,其中@JestId为文档id,即Elasticsearch中的_id字段,本文BookDocument内容如下:

    package com.dalaoyang.document;
    
    import io.searchbox.annotations.JestId;
    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @Builder
    @AllArgsConstructor
    @NoArgsConstructor
    public class BookDocument {
    
        @JestId
        private String id;
        private String bookName;
        private String bookAuthor;
        private Integer pages;
        private String desc;
    }
    

    为了方便操作,这里创建了一个request对象进行操作,如下:

    package com.dalaoyang.model;
    
    import com.dalaoyang.document.BookDocument;
    import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @Builder
    @AllArgsConstructor
    @NoArgsConstructor
    public class BookRequest {
    
        //删除文档用
        private String id;
        //查询用
        private String keyword;
        private String indexName;
        private String typeName;
        //新增文档用
        private BookDocument body;
    }
    
    

    在使用相关操作时,其实都是通过io.searchbox.client.JestClient#execute来进行操作(需要注意,这里没有对JestClient进行配置,只是使用的默认的配置),将对应动作当做参数传入,接下来介绍几个常用的动作。

    3.2 索引类操作

    结合MySQL来看的话,索引可以理解为一个数据库,索引相关的操作可能不是很多,这里介绍相对比较常用的是创建索引和删除索引,如下:

    3.2.1 创建索引

    CreateIndex createIndex = new CreateIndex.Builder(indexName).build();
    

    3.2.2 删除索引

    DeleteIndex deleteIndex = new DeleteIndex.Builder(indexName).build();
    

    通过上面两个操作可以看到,都是通过使用对应的Index实体来操作对应实体,当然还有一些不是很常用的,如果有需要可以查看相关文档进行使用,这里不一一介绍了,完整s示例内容如下:

    package com.dalaoyang.web;
    
    import io.searchbox.client.JestClient;
    import io.searchbox.client.JestResult;
    import io.searchbox.indices.CreateIndex;
    import io.searchbox.indices.DeleteIndex;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class IndexController {
    
        @Autowired
        private JestClient jestClient;
    
        @GetMapping("createIndex")
        public String createIndex(String indexName) throws Exception{
            CreateIndex createIndex = new CreateIndex.Builder(indexName).build();
            JestResult result = jestClient.execute(createIndex);
            return result.getJsonString();
        }
    
        @GetMapping("deleteIndex")
        public String deleteIndex(String indexName) throws Exception{
            DeleteIndex deleteIndex = new DeleteIndex.Builder(indexName).build();
            JestResult result = jestClient.execute(deleteIndex);
            return result.getJsonString();
        }
    }
    
    

    3.3 文档类操作

    文档相当于MySQL中的行记录,也就是说一条数据,由于新增和修改在同一个方法内,所以这里也是对新增(和修改)和删除方法进行介绍,如下:

    3.3.1 新增或修改文档

    首先会判断索引是否存在,不存在的话会根据索引文档进行创建索引,然后进行新增或修改操作,如果没有指定id的话(上文说的注解@JestId字段),会自动生成一个id。

    Index.Builder builder = new Index.Builder(bookRequest.getBody());
    Index index = builder.index(bookRequest.getIndexName()).type(bookRequest.getTypeName()).build();
    

    这里使用新增文档创建三条数据方便后面查询,如下:

    {
        "indexName": "book",
        "typeName": "book",
        "body": {"id":"test0001","bookName":"数学书","bookAuthor":"复旦大学","pages":100,"desc":"复旦大学的数学书"}
    }
    
    {
        "indexName": "book",
        "typeName": "book",
        "body": {"id":"test0003","bookName":"语文书","bookAuthor":"北京大学","pages":100,"desc":"北京大学的语文书"}
    }
    
    {
        "indexName": "book",
        "typeName": "book",
        "body": {"id":"test0003","bookName":"英文书","bookAuthor":"清华大学","pages":200,"desc":"清华大学的英文书"}
    }
    

    3.3.2 删除文档(根据id)

    Delete index = new Delete.Builder(bookRequest.getId()).index(bookRequest.getIndexName()).type(bookRequest.getTypeName()).build();
    

    完整示例内容如下:

    package com.dalaoyang.web;
    
    import com.dalaoyang.model.BookRequest;
    import io.searchbox.client.JestClient;
    import io.searchbox.client.JestResult;
    import io.searchbox.core.Delete;
    import io.searchbox.core.Index;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    
    @RestController
    public class DocumentController {
    
        @Autowired
        private JestClient jestClient;
    
        @PostMapping("saveOrUpdateDocument")
        public String saveOrUpdateDocument(@RequestBody BookRequest bookRequest) throws Exception{
            Index.Builder builder = new Index.Builder(bookRequest.getBody());
            Index index = builder.index(bookRequest.getIndexName()).type(bookRequest.getTypeName()).build();
            JestResult result = jestClient.execute(index);
            return result.getJsonString();
        }
    
        @PostMapping("deleteDocumentById")
        public String deleteDocumentById(@RequestBody BookRequest bookRequest) throws Exception{
            Delete index = new Delete.Builder(bookRequest.getId()).index(bookRequest.getIndexName()).type(bookRequest.getTypeName()).build();
            JestResult result = jestClient.execute(index);
            return result.getJsonString();
        }
    }
    
    

    3.4 查询操作

    查询操作可能是对Elasticsearch最需要使用的场景,这里举一个简单的场景,输入关键字,查询对应book文档,关键字匹配(bookName,bookAuthor,desc)三个字段,这里结合Elasticsearch官方依赖进行操作,完整示例如下:

    
    package com.dalaoyang.web;
    
    import com.dalaoyang.model.BookRequest;
    import io.searchbox.client.JestClient;
    import io.searchbox.core.Search;
    import io.searchbox.core.SearchResult;
    import lombok.extern.slf4j.Slf4j;
    import org.elasticsearch.index.query.MultiMatchQueryBuilder;
    import org.elasticsearch.search.builder.SearchSourceBuilder;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @Slf4j
    public class QueryController {
    
        @Autowired
        private JestClient jestClient;
    
        @PostMapping("search")
        public String search(@RequestBody BookRequest bookRequest) throws Exception{
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            searchSourceBuilder.query(new MultiMatchQueryBuilder(bookRequest.getKeyword(), "bookName","bookAuthor","desc"));
            log.info(searchSourceBuilder.toString());
            SearchResult result = jestClient.execute(new Search.Builder(searchSourceBuilder.toString())
                    .addIndex(bookRequest.getIndexName())
                    .addType(bookRequest.getTypeName())
                    .build());
            return result.getJsonString();
        }
    }
    
    

    比如这里搜索清华,这里我打印了一下查询语句,如下:

    {
        "query":{
            "multi_match":{
                "query":"清华",
                "fields":[
                    "bookAuthor^1.0",
                    "bookName^1.0",
                    "desc^1.0"
                ],
                "type":"best_fields",
                "operator":"OR",
                "slop":0,
                "prefix_length":0,
                "max_expansions":50,
                "zero_terms_query":"NONE",
                "auto_generate_synonyms_phrase_query":true,
                "fuzzy_transpositions":true,
                "boost":1
            }
        }
    }
    

    查询的结构只有一条,与在Elasticsearch-Head中查询一致,如图

    image

    4.一些建议

    相关操作Elasticsearch的客户端有很多,这里就不做相关对比了,JestClient本人也在真实上线项目中使用过,这里只是在使用过几种的前提下做出几点建议:

    • Elastic官方已经开始建议使用HTTP方式去操作Elasticsearch了
    • 当初选择这种的原因是考虑到更好的去扩展版本,封装响应的操作类可以兼容更多的版本。
    • 在高版本的Elasticsearch中,有一些文档类型的内容被单独抽离出来了,比如父子文档。

    5.源码

    源码地址:https://gitee.com/dalaoyang/springboot_learn/tree/master/springboot_jestclient

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